1989 Wanderlodge Wide Body Pusher (WB)

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1989 WB 40.jpg
Year 1989
Type Wanderlodge Wide Body Pusher
Engine Detroit Diesel 8v92TA-475hp
with DDEC
Suspension Ridewell RAD-227WB Air Suspension
Generator Kohler 12.5kW Diesel
Tires Michelin 12R22.5
Transmission Allison MTB 748 4-Speed with Retarder
Breaks Full Air
Bathrooms Walk Thru
Side Bath
A/C 13,500 BTU - 3 Rooftop
18,00 BTU - 1 Automotive (Dash)
Diesel Fuel 300 gal.
Fresh Water 116 gal.
Gray Water 105 gal.
Waste Water 105 gal.
Propane (LP) 45 gal.
GVWR: 40,000 lbs
Length: 40'
Width: 102"



This section provides information on the opera­tion and function of the controls, indicators and gauges located in the pilot/co-pilot compartment that are used in connection with the coach automo­tive systems. Figure 2-1 illustrates the pilot/co-pilot compartment, high-lighting the instrumentation and panels covered in this section.


All essential operating controls and gauges used to monitor and control associated engine, generator and coach systems are located conveniently on and adjacent to the electroluminescent dash panels, figure 2-2.

Associated instrumentation, accessible on the bulkhead above the pilot, includes generator ON­ OFF switch, altimeter and diesel fuel filter moni­tors. Refer to figures 2-2 through 2-13 and the fol­lowing paragraphs for locations and functions of associated operating controls and indicators.

Pilot Control Center (Dashboard)

You are now seated in the control center of your new coach. You have control of all engine func­tions , generator functions as well as all accessory functions at your fingertips.

Our new dash layouts for 1988 were designed for viewing continuity as well as function and beauty. You will notice as you drive that viewing angle changes only slightly from the road to any part of the dash.

The dash is divided into eight main panels, (fig. 2-2) which are the upper dash panel, lower dash panel, shifter panel, upper right hand dash panel, lower right hand dash panel, monitor panel, moni­tor control panel and inverter panel. The gauges, switches and warning lights installed in these panels will be explained as far as function and op­eration in the following text.

NOTE: Some items operate at all times, some require the 12 volt master to be on, while others need the 12 volt master and the ignition on. Gauges marked with an * require the engine to be at nor­mal operating temperature for correct readings.

Upper Dash Panel

1989 WB Upper Dash Panel .png
  1. Engine Water Temperature - Normal water temperature should be between 180° and 210° for safe operation.
    • CAUTION: If the Engine Temperature gauge indi­cates excessively high temperatures, the engine may be over-heating and should be stopped to prevent damage. Allow the engine to cool before check­ ing the radiator coolant level.
  2. Engine Oil Temperature - Gauge-Gives a constant reading of the engine oil in the supply line from the pump. The normal operating temper­ature is from 200°F to 250°F. If the temperature goes over 250° the engine may be low on oil or there is overheating of the cooling system.
    • CAUTION: Your Wanderlodge is designed to op­erate at ambient temperatures up to 100°F with no problems. If temperatures greater than 100°F are encountered, the operator must closely observe engine water and oil temperature and trans­ mission oil temperature to avoid over­ heating conditions. If overheating con­ditions occur at ambient temperatures less than 100°F, the cooling system must be checked and problem cor­rected.
  3. Engine Oil Pressure - Indicates the pressure of the oil, not the amount of oil in the engine reservoir. This gauge will normally read be­ tween 50 and 70 psi during cruising speeds; and drop to a minimum of 5 psi when the engine is idl­ing.
    • CAUTION: No oil pressure, or low oil pressure readings (below 25 psi) when engine is operating at cruising speeds are trouble indications! Do Not Operate the Engine Under These Condi­tions!
  4. DC Volts - Registers the actual voltage at the coach batteries. With the engine running, gauge should read14 volts (+ or - 0.5).
  5. Alternator Charging Amps - Shows total charging current in amperes. With the engine run­ ning, total alternator output is shown. When parked, with a source of 120 volt ac, (outside power or generator), the gauge will show total output of the battery chargers.
  6. Tax Axel Pressure - The tag axle sus­pension pressure is factory set at 60 psi on WB-38 & 40 coaches
    • CAUTION: Before driving check gauge to make sure there is pressure in the tag axle air bags. This is critical for proper coach axle weight distribution.
  7. Air Pressure Front/Rear - The Dual Air service Brake Pressure systems are engine operated and supply independent brake system air pressure for front and rear service brakes and the parking brake. During normal oper­ation, each air pressure gauge reading will build up to 100 psi to 120 psi shortly after the engine is started. Note that, as a safety feature, the parking brake cannot be released until air pressure read­ings are at least 65 psi.
  8. Fuel Level - Indicates the amount of diesel fuel remaining in the 300 gallon fuel tank. Note that the 12.5 kw generator also gets its fuel supply from the 300 gallon tank. This gauge reads only when the ignition switch is in ON or ACCES­SORY position. As a precaution against generator operation draining the fuel supply, the generator fuel pickup is shorter than the engine pickup. Sep­arate fuel filters are provided for each fuel line.
  9. Low Fuel Light - When this light comes on it is an indication that the operator should be looking for the nearest refueling station.
  10. Low Air Warning Indicator - This light is associated with a buzzer. These warn the driver that there is an insufficient supply of air (65 psi or less) to properly operate the coach. If the air pressure is low, when the ignition key is turned on, the light and buzzer will come on immediately. Both warnings will continue until the air pressure is built back up, or the ignition key is turned off.
  11. Burglar Alarm Switch - There are two switches that turn the Burglar Alarm on and off. The switch on the dash is used when you are inside the coach. The weather proof key switch, outside the coach next to the entrance door , is used when you are going to be leaving your coach for awhile. Note that both switches operate independently of one another. If the Burglar Alarm is turned on at the dash, then it must be turned off at the dash. The outside switch works on the same principle.
  12. A/T (Anti-Theft) - deactivates the starting system for protection against unauthorized cranking and theft.
  13. Accessory - These BLANK positions may be used for the installation of additional switches and indicator lights for customer add on equipment.
    • CAUTION: Use existing panel holes for installation of additional controls or indicators. Drilling new holes will destroy the electroluminescent features.
  14. Headlight Alert - When the ignition switch is turned off and the headlight switch is on, this red warning light, along with a buzzer , will come on. These will remain on until the headlight switch is turned off or the ignition switch is turned back on.

Lower Dash Panel

1988 WB Lower Dash Panel Diagram.png
  1. Speedometer - Indicates speed and ac­ cumulated mileage (odometer). This is a solid­ state electronic monitor, with an RPM sensor lo­cated at the right drive axle brake drum
  2. Tachometer / Hour Meter - Indicates actual engine RPM (Revolutions Per Minute) when scale (0-25) reading is multiplied by 100. Idle RPM should be 600 and full load (uphill) 2100 RPM. HOUR METER shows number of hours engine has been in operation.
  3. Transmission Retarder Temperature - Measures temperature of the transmission retar­der oil. If the gauge registers a temperature over the 330°F maximum safety range, reduce use of transmission retarder. See information on use of transmission retarder later in this section.
  4. High Beam - The Blue Bird logo is illuminated when high beams are selected using steering column switch.
  5. Water in Fuel - This light  comes on when there is an excess of water in the bottom of the fuel tank
  6. Suspension Dump - Light flashes to tell you that the suspension system has little or no air, and that the suspension needs to be pressurized before the coach is driven.
  7. Level Warning - This light comes on when any of the four (4) leveling jacks is not fully retracted.
  8. Turbo Pyrometer - Registers the tem­perature of the exhaust gas output of the Turbo. The correct temperature of the exhaust should be around 740°F at maximum power.
  9. Rear Landing Light Switch - At the ON position this switch turns ON the landing lights in the front right and left panels just behind the front tires. These lights shine toward the rear of the coach so are called Rear Landing Lights. Note that a small blue indicator lights when the switch is ON.
  10. Front Landing Light Switch - To turn on the front Landing lights, located in the rear side panels just in front of the rear wheels, push this switch to the ON position. The indicator next to the switch should be lit when the switch is on.
  11. Rear Parking Light Switch -This switch controls the on-off operation of the rear parking lights (rectangular halogen lights above the rear bumper) when transmission selector lever is in R An indicator next to the switch lights when the rear parking lights are on.
  12. Comp. Light Master - When this switch in the ON position provides power to all of the exterior compartment light switches. As each compartment door is opened, the light automatically comes on; closing the door turns the light off.
  13. Radar Master - Turns on power to the Radar
  14. Heat - To turn on the heater blower for the pilot's area press this switch to either the HI- or LOW position. Note: when the front heat control is in cool position the heat switches (14) and (17) can be used to provide cool air circu­lation by turning on the blowers.
  15. Mirror Heat - This switch turns on a thermostatically controlled heater in the right and left outside mirrors (convex mirrors excluded ). With the switch ON the Mirror Heaters will automatically come on to defog the mirrors.
  16. LP Heat - When in the ON posi­tion, 12v. power is supplied to the LPG furnaces.
  17. Heat - To turn on the heater blower for the co-pilot's area press this switch to either the HI- or LOW position. Note that when the front heat control is in cool position the heat switches (14) and (17) can be used to provide cool air circu­lation by turning on the blowers.
  18. Defrost - Turns on the blower for defrosting or defogging the front windshield. Set to HI-or LOW speed as desired.
  19. Aux Battery - When this switch is pressed, a jumper solenoid connects the generator and coach batteries together (in paral­lel) to provide extra power for cranking the generator or coach. Releasing the switch im­mediately isolates the two battery systems.
  20. Air Level Master - Allows you to level the coach to a certain extent using the air sus­pension. This is an optional system and should only be used for short periods of time.
  21. Horn Selector - Allows selec­tion of the air or electric horns when the steering wheel horn button is depressed.
  22. Fan Override - This switch operates the engine cooling fan in the engine compartment. Normally, this fan will operate at 125 to 400 RPM from an engine RPM of idle to 2100. If the coolant temperature reaches 195°F, the fan will be ther­mostatically controlled to run at 1800 RPM. To override the thermostat turn the Fan Override switch ON, and the engine cooling fan will turn 1800 RPM continuously at any temperature.
  23. Air Compressor Master - This switch operates the auxiliary air compressor (optional equipment) which is a 120 vac operated back up air compressor.
  24. Backup Alarm - This switch turns the back-up alarm buzzer off.
  25. Suspension Dump - This switch controls the inflation of the air suspension systems for the front and rear axles. Move switch to the right to dump the bags.
  26. Tax Axel Dump - In UP position tag axle air suspension is pressurized as indicated on dash gauge TAG AXLE PRESSURE . When switch is moved right pressure in tag axle is dumped.
    • Note: SUSP. DUMP accessory warning light is lit: set switch to UP posi­tion to re-inflate the air bags before driving away. (System air pressure must be at least 65 psi.)
    • Your motorhome is equipped with air suspen­sion bags which cushion the front, rear and tag axles. Dumping these air bags when the vehicle is parked allows the rubber bumpers to come to­gether and eliminate vehicle springiness. Two switches control dumping and filling of the respec­tive air bags. The SUSP. DUMP switch controls the front and rear axle suspension; the TAG DUMP switch controls the tag axle only. Note: The accessory air tank must contain at least 65 PSI pressure for the air switch to function. The accessory air tank pressure does not register on the dash air pressure gauges.
    • Moving the SUSP. DUMP switch to the UP posi­tion applies air pressure to three air pilot-operated valves on the suspension system. Two of these valves are located on the rear axle; and one is lo­cated on the front axle. The pilot air shifts the valves, cutting off the air supply to the air bags and allows the air in the bags to escape. After the sus­pension system has been dumped, and the igni­tion is turned on, a warning pilot light is illuminated on the dash to warn the driver that the system is dumped and not to drive the vehicle until the SUSP. DUMP switch is set to the up position. Note: If the leveling jacks are to be used while the coach is parked, the jacks must be lowered to level the vehicle before the air bags are dumped. If the air bags are dumped before the jacks are down, the vehicle is too low for the jacks to unfold into lifting position properly. This could damage the jacks. When dumping, the tag axle is dumped first, then the front and rear axles. However, when pressurizing, the front and rear axles are pressurized first, then the tag axle.
  27. Wiper Delay - Knob adjusts wiper speed from 2 to 20 sweeps per minute when intermittent operation is selected at steering column switch lever.
  28. Hazard Switch - This switch turns on the emergency flashers. When switch is used both turn signals will flash in unison.
  29. The Horn (Figure 2-4) - This corner of the dash has 3 different switches for use with the musi­cal horn
    • The SELECTOR switch incorporates 2 thumb­ wheels for selecting the tune to be played. Use The Horn manual to select a tune. Then set the thumb-wheels to the corresponding numbers or number and letter. Note: that if a tune is playing, making a new selection on the selector switch will not affect the tune playing.
    • The POWER switch provides power to the mu­sical horn. When this switch is turned ON the horn will immediately start playing the tune that corres­ponds to the digits on the selector switch.
    • The PLAY switch (momentary) resets the horn to the beginning of tune chosen by the Selector switch. If the PLAY switch is pressed while a tune is playing, that tune will stop instantly and the horn will reset to the beginning of the tune that corres­ponds to the digits on the SELECTOR.
  30. Auxiliary Switch - When set to the EXTENDED position, activates a relay automatically locking the outside entry step in the out position. The indicator light comes on when the ignition switch is turned on to remind you that you need to retract the step before proceeding.
  31. Low Washer Fluid Light - Light indicates when there is approximately 1 /4 contained in the fluid reservoir.
  32. Right Turn Indicator - When the turn signal lever , (steering column control section), is pushed up into the right turn position this indicator flashes in conjunction with the outside directional lights . The right cornering light will come on continuously if the headlights or the parking lights are turned on while the turn signal lever calls for a right turn. The indicator , along with the left turn indicator and all outside directional lights, flash in unison when the HAZARD switch (item 28) is pressed to the on position .
  33. Turbo Boost Gauge - Registers the psi of the Turbo Compressor outlet. The gauge should read a maximum of 23.2 psi at maximum power.
  34. Transmission Oil Temperature Gauge - Monitors and gives constant temperature readings of the transmission oil. Maximum allowable is 330°F.
  35. Left Turn Indicator-When the turn signal lever is pulled down into the left turn position , this indicator flashes in conjunction with the outside directional lights. The left cornering light will come on continuously if the headlights or the parking lights are turned on while the turn signal lever calls for a left turn.
  36. Aisle Lights - This switch allows you to turn on or off the fluorescent aisle lights from the pilot 's chair.
  37. Dash Dimmer - Will only operate when the headlight switch is on. The background lighting (electroluminescent) for the dash can be brightened by turning counter-clockwise and dimmed by turning clockwise.
  38. Headlights - The Headlight switch serves two functions . Press P for parking lights and gauge illumination. Press the bulb symbol for headlights, parking lights and gauge illumination. The dimmer controls brightness of all gauges in dash. Turn counter-clockwise to increase or clockwise to decrease the brightness .

Shifter Panel

1989 WB Shifter Panel Diagram.png

  1. Transmission Shift Selector - Fig­ure 2-5 shows the selector for the 8V92 engine. This is the push button shift selector made avail­ able with the Allison Transmission Electronic Con­trol (ATE C). With ATEC, shifts are more accurate and positive than those obtainable with conven­tional hydraulic controls. ATEC makes it possible to precisely match the optimum fuel economy/shift curve relationship. Only four speeds are required with this system. See Diesel Engine/Transmission Operation later in this section for detailed descrip­tion.
  2. Transmission Retarder - Provides power to Transmission Retarder/Brake System. The adja­cent indicator lights when the retarder is opera­tional. Use of RETARDER HAND CONTROL will be covered later in this chapter.
  3. Accessory Position - These blank posi­tions may be used for the installation of additional switches and indicator lights for customer add on equipment.
    • Caution: Use existing panel holes for installation of additional controls or indicators. Drilling new holes will destroy the elec­troluminescent features.
  4. Marker Lights - Press this switch to ON to turn on the clearance, side marker and identification lamps located on the top sides and ends of the coach. This switch may also be flipped on and off to flash the marker lights as a courtesy signal.
  5. Driving Lights -  The  driving lights are mounted behind the front bumper in a re­tracted position. When the switch is energized the driving lights are lowered into position (if the sus­pension is at ride height). The driving lights do not come on unless the high beam light switch is ener­gized and the driving lights are in the down position. The driving lights go out when the lights are switched to low beam or when the driving lights switch is turned off. When the driving lights switch is turned off the driving lights retract back to the stored position.
  6. Cruise Control - These three switches operate in the following manner: The switch on the left turns the cruise control on or off. The switch on the right locks the cruise control in on the desired cruising speed and permits resetting at a lower speed following a previous setting. The switch in the middle permits returning to cruising speed fol­lowing disengagement by stopping and obtaining a higher cruising speed.
    • Note: The coach must be traveling at least 35 MPH before the cruise control will oper­ate properly. When the desired speed is reached, press the On-Off switch to the On position, then press the Set-Coast switch to the Set position and hold for two seconds before releasing. The coach should automatically remain at that speed. If a lower cruise speed is desired, press the Set-Coast switch to the Coast position and hold until the de­ sired cruising speed is obtained. Release the switch immediately. The coach should remain at the new speed. Following disengagement of the cruise control by breaking the previously set cruising speed may be obtained by depressing the Resume-Accel switch to the Resume position for two seconds. Note that the coach should be at or above 35 MPH before attempting the Resume function. In addi­tion, if the ignition switch has been turned off, the previous cruise speed will be erased from memory and the new cruise speed will be that speed when the Resume switch was pressed. If a higher cruising speed is desired and the cruise is enabled, press the Resume-Acee! switch to the Accel position. The coach will begin to accel­erate. When the higher desired cruising speed is obtained, immediately release the Accel switch. The coach should remain at the new speed.
  7. Engine Monitor Switches High Idle - This switch when turned to On, in­ creases the engine idle speed to approximately 1100 RPM. This will provide a faster engine warm­ up and also provide better cooling when stopped in traffic with chassis AIC on.
    • Engine Stop Override - This switch momentarily overrides DDEC engine shutoff system.
    • Stop Engine Light - Indicates when a po­tential engine damaging condition has been de­tected .
    • Check Engine Light - Indicates that a prob­lem has occurred.
    • Engine Test - This switch is to check the system for problems.
  8. Transmission Check Light and TEST SWITCH - ATEC has a built-in diagnostic system . If any problem should develop the Check Trans. light will come on. A Detroit Diesel Allison service facility will immediately be able to determine the cause by push­ing the momentary Trans. Test rocker switch. The Check Trans. light will then blink out the code for the problem.
  9. Cockpit Light - This switch con­trols On-Off ope ration of the fluorescent lights.
  10. AC/Heat Master - These switches allow the driver to control roof air con­ditioners or the electric heaters.

Upper Right Hand Dash Panel

1989 WB Upper Right Hand Dash Panel Diagram.png

  1. Lighter - Depress to heat the element; pops out when hot.
  2. Security Lock - Dual switches used to lock and unlock the deadbolt lock on the entrance door. A switch is also located on bed­ room control panel.
  3. Cold Start - When switch is pressed to on it sends a timed pulse of ether into the air intake of engine to help starting in cold weather.
  4. Left Vent and Right Vent - Operate the air cylinder controlled air vents to direct fresh air to the pilot and co-pi lot areas.
  5. Compact Disk Player - Space available for optional disc player with premium sound

Lower Right Hand Dash Panel

Lower Right Hand Dash Panel.png

Ignition Switch - A four-position, standard type key switch . In OFF position (center), ignition and accessory positions are disabled and the key can be inserted or removed. In ON position (right) the battery is connected to the engine- run ignition circuits and the key can be advanced to START to start the engine, providing that the transmission selector is in neutral N position and toggle switch in engine compartment is up (front) . ACCESSORY position (left) allows operation of accessories without activating the engine-run circuits.

Wandersound Stereo - is comprised of the BLAUPUNKT LEXINGTON Tuner/Cassette with four (4) 6 x 9 inch coaxial pyle driver speakers and two (2) 6 ½ inch coaxial pyle driver speakers. The BLAUPUNKT Tuner/Cassette has auto reverse, electronic tuning sensor , Dolby noise reduction and metal tape capabilities. The speakers are located four (4) in the living room and two (2) in the bedroom. A privacy switch is located on the overhead panel above the driver's head. The privacy switch turns the living room speakers off. Headphone jacks are located on the hood table and in the bedroom. There is a volume control in the bedroom controlling the volume of the bedroom speakers.

CB Inverter control panel diagram - 89 WB 40.png

Monitor Controls - Brightness contrast and On/Off controls adjust in the same manner as any black and white TV.

Front Heat Control -This slide control opens or closes the valve in the front heater hose line for heating or cooling.

C.B. - Jack for headphone listening with volume control.

Stereo - Stereo jack for headphone use with AM/FM Stereo Tuner/Cassette player and optional disk ·player. Privacy switch when turned on cuts power to all front speaker. Use switch when stereo headphones are used.

Inverter - Space for optional inverter controls. (See Inverter section for information)

Overhead Control Center

89 WB 40 - Pilot Overhead Dash Diagram.png

  1. HEAT SELECTOR - Operates solenoid valves in engine coolant line to divert coolant flow through hot water heater and chassis heaters when this switch is in WINTER position. Setting the switch to SUMMER position causes the coolant to flow through the hot water supply heater coil only .
  2. AUX. PUMP - Controls the auxiliary water pump (under floor at road side rear) that boosts the circulation of engine coolant through the water heater heat exchanger and chassis heaters in the bedroom , bathroom , dinette and living room.
  3. DASH DIMMER - This control will only operate when the headlight switch is on. The background lighting (electroluminescent) for the upper dash can be brightened by turning counterclockwise and dimmed by turning clockwise.
  4. SPOTLIGHT SELECTOR - Depressing switch , left or right, selects LH or RH light operation.
  5. SPOTLIGHT BEAM SELECTOR - Depressing left side of switch activates FLOOD while right side pressure selects SPOT . Center position is OFF.
  6. SPOTLIGHT SPEED - Adjusts speed of light head movement.
  7. SPOTLIGHT AIM - Controls horizontal and vertical beam position.
  8. CAMERA DEFOG - Energizes fan in compartment for Closed Circuit TV (CCTV) camera.
  9. AIR CONDITIONER LEFT FAN - Three speed blower for left front area of coach. Left fan switch must be in either HI, MED, or LOW to energize compressor.
  10. AIR CONDITIONER Temperature - Thermostat setting controls temperature by cycling compressor.
  11. AIR CONDITIONER RIGHT FAN - Three speed blower for right front area of coach.
  12. CLOCK PANEL - This panel includes a digital readout. Four switches to the left of the display set clock timing. To set TIME display set clock timing. to set TIME qispl~y, press HR SET/MIN SET switch to HR SET position and hold until correct hour is displayed; repeat with switch in MIN SET position until correct minutes are displayed. The ELAPSED TIME display will show elapsed time in terms of hours and minutes , or in minutes and seconds , depending on the position of the HRS/MIN - MIN/SEC switch. Set this switch a!'; desired, press ZERO to reset the display to 00:00 readout , and the elapsed time will count. The HOLD/GO switch may be set to HOLD position to suspend operation of the elapsed time display ; for elapsed time operation, leave switch in GO position.
  13. SAFELINE ALARM - The Safeline alarm operates whenever the shoreline is connected to the coach and the ignition switch is in ON position as a reminder to disconnect the shoreline before driving away. With the Safeline switch ON, the alarm is given by buzzer sound and red light. The buzzer can be deactivated in favor of a flashing amber light by turning off the switch.
  14. ACCESSORY - These Blank positions may be used for the installation of additional switches and indicator lights for customer add on equipment. Caution Use existing panel holes for installation of additional controls or indicators.
  15. WATER IN FILTER - Light and buzzer alarm.
  16. GENERATOR START/STOP - Provides local control for generator operation. Press this center-off momentary switch to ST ART position and hold until generator starts , as indicated by the switch indicator illuminating . If generator does not start within 2 to 5 seconds, release switch, wait 30 seconds, then try again. To shut down the generator, press to OFF position and hold until light extinguishes.
  17. TRIP ODOMETER-Depress bar to reset.
  18. ANTENNA - Both switches must be pushed simultaneously to cause raising or lowering of TV antenna. Indicator will light when TV antenna is up from its secured position when ignition switch is turned on.
  19. ALTIMETER- Indicates coach height above sea level. (Zeroing adjustment can be used to calibrate unit at known elevations.)
  20. FUEL VACUUM GAUGE - Racor fuel filter element should be changed when pointer goes into red.

Co-Pilot's Overhead Dash

GENERATOR OIL PRESSURE - Shows the oil pressure, not amount of oil in the generator engine reservoir. This gauge will normally read between 30 and 60 psi. Low oil pressure indications are often a symptom of possible generator failure. Oil level should be checked on a regular basis. Note that the generator has a low oil pressure shut-off switch which operates if the generator oil pressure falls below 15 psi.

GENERATOR WATER TEMP. - Displays generator engine coolant temperatures from 100 to 240 degrees. Normal operating temperatures vary from 175 to 190 degrees. If consistently high temperatures are indicated , shut down the generator , wait for the engine to cool, then check radiator coolant level. Note that the generator has a high-temperature shut-off switch which operates if the generator temperature reaches 225 degrees F.

GENERATOR VOLTS - Expanded-scale voltmeter , with scale graduations from 10 to 16 volts, shows the condition of the generator battery . Normally, the battery voltage varies from 12 to 13 volts; under starting load it may drop to about 10.5 volts and then rise to about 14.0 when the generator starts and begins charging the battery through the external isolator unit and battery chargers. Battery voltage readings less than 10.5 or more than 15 are usually a symptom of an electrical system failure or impending battery breakdown.

GENERATOR HOURS RUN - Indicates total hours of generator operation .

D.C. AMPERAGE - Ammeter on left (labeled CHARGE) shows net current flow to or from batteries. Needle movement from the center of the gauge indicates discharge to the left and charge to the right. When parked, following highway travel , it is normal to see a needle position to the left of center even when plugged into shore power (or running generator). This will gradually diminish and should eventually show some movement to the right with coach loads turned off. Ammeter on right (labelled DISCHARGE) shows current demand of 12 volt load. A.C. VOLTAGE - Voltmeter on left monitors LEG ONE while that on right monitors LEG TWO of 120 volt alternating current circuits.

A.C. AMPERAGE -Ammeters show current flow in LEG ONE (left) and LEG TWO (right) of 120 volt alternating current circuits. Polarity Normal indicator (green), lit whenever the shoreline hookup is properly connected and grounded and line polarity is compatible with coach wiring and a Polarity Reversed indicator (red) which lights when hookup is reversed. A faulty ground connection is indicated in none of the LEDs is lighted.

Steering Column Area

The steering column area, figure 2-14 includes controls located on the steering column, and under the dash .

1989 WB 40 - Steering Column Area Diagram.png

HORN - Operate the horn by pressing in on the center section of the wheel. Select air or electric horn with the

HORN SELECTOR switch on the dash.

COMBINATION TURN SIGNAL/High BEAM and WASHER/WIPER SELECTOR - Push lever toward dash for right turn signal , pull lever away from dash for left turn signal. Pull lever up toward steering wheel and hold for momentary high beam. When lever is released low beams are activated . Push lever down until switch is activated for high beam operation. Pull lever back toward steering wheel to go to low beam operation. The washer ring is located at the end of the lever and when pushed activates the windshield washer , but only when the wipers are activated. To activate the wiper twist lever from "O" position to I or II for continuous speeds or to INT for intermittent operation. When in INT position_ the delay of the wipers can be changed by the wiper delay knob on the lower dash panel. Twist lever back to "O" position to turn wipers off.

TILT LEVER - Pull lever up to release lock mechanism . While holding lever up, adjust the steering whee l to a comfortable position and release lever. Move the steering wheel slightly to make sure the column locks into position.

TELESCOPING STEERING WHEEL - to unlock telescoping wheel twist center sect ion of steering wheel counter-clockwise and adjust wheel to comfortable position. While holding steering wheel at desired position with one hand lock it into position by turning the center section of wheel clockwise.

PARKING BRAKE - The Parking Brake control is located under the lower dash , to the right of the steering column. Note that the parking brake cann t be released unless the system air pressure is at least 65 psi.

12 VOLT MASTER SWITCH - This switch is hidden under the lower dash, to the right of the steering column. Use this switch to shut off the 12 volt battery power to all circuits except the digital clocks, radio memory, monitoring panel functions, refrigerator controls, and burglar alarm.

ENGINE SHUTOFF CONTROL - (Only on California model) This control is located under the lower dash just to the left of the steering column. In the event that turning the ignition switch to OFF does not shut down the engine , pull this control (PULL TO STOP) fully outward. This operates a positive mechanical linkage to shut off fuel to the engine.

Floor Controls

AIR HORN FOOT - Operates highway horns. Close to steering column.

ACCELERATOR PEDAL - Controls engine fuel flow to select power output. See Diesel Engine /Transmission Operation later in this sect ion for detailed description.

BRAKE PEDAL - The coach is equipped with a dual air brake system which includes independent systems for the front and rear service brakes. A separate reservoir and panel-mounted pressure gauge is provided for each service brake system. (Air Pressure Front and Rear).

Radar Detector A high-sensitivity superheterodyne microwave radar detector is installed as standard equipment on your coach . This unit, is designed to activate when transmissions are received from radar-type speed detection equipment. The radar master switch (on the lower dash panel) is used to supply power to the radar detector.

Controls and Indicators

Seat Controls - Electrically and air-operated six-way seat adjustments are built into the pilot's and co-pilot's seats. A typical control panel is shown in figure 2- 15. Three electric SEAT CONTROLS are used to control seat bench tilt, up-down and front-back seat movement , and seat back tilt. The SIDE SLIDE switch operates an air cylinder which locks the position of the slide mechanism beneath the seat. Press switch to disengage the seat slide lock, adjust side-to-side position, then release switch to re-engage lock mechanism. This switch must be kept LOCKED to secure the seat during travel. These seats may be rotated by releasing the lever underneath the seat base on the right side.

Closed Circuit TV Monitor System - System Components Besides the TV receiver on the lower dash , the CCTV Monitor receiver system also includes: • CCTV camera, located in the rear of the coach, figure2-16. • Picture brightness , contrast and ON/OFF switch on lower dash. CCTV Operation The rear-facing CCTV camera transmits images directly to the monitor via coach cabling. Note that the system requires a brief warmup period before achieving full resolution. CCTV camera controls are preset and the standard lens supplied with the unit is designed to focus from about two feet to infinity.

TV Antenna and Rotator System - The control components of the antenna and rotator are a hand-held switch-operated rotator, radome-type TV roof antenna , switcher for the antenna or cable inputs and a switch for raising and lowering the antenna. The A-B switch , switches antenna A or cable B input via connections in shoreline compartment at the rear of the coach to the TV receptacles via the VCR (if present). The antenna rotator controls the position of the TV antenna within the radome. The three-position momentary switch ( center OFF) provides right/left antenna rotation. The radome includes an amplifier and rotator mechanism. The remote power supply operates from 12 volts de. Low-loss coaxial cable and three wire rotator control cable interconnect the antenna and power supply.

Note that the system is protected by a fuse in the overhead load center. In the event that the TV set exhibits problems relating to low antenna input (ghosts,etc .) check this fuse before servicing the TV set.

Antenna Operation With the TV on and a station tuned in, rotate the antenna by pressing the rocker switch located on the control unit. Press the right side of the switch to turn the antenna clockwise; press the left side to turn the antenna counter-clockwise . Although the actual antenna movement is not visible, the indicator arrow on the control unit lights and shows the direction of movement. When the antenna has made one full turn (360 degrees) , the End of Rotation light comes on. Observe the picture while rotating the antenna, first in one direction , then the other , to obtain best picture quality . The switches for raising or lowering the antenna are located in the Pilot's Area Overhead Dash and Radio Panel, figure 2-12, item 18.

CB transceiver Unit has all the functions in the mike , while the electronic parts are in the black box module mounted in the dash area. Controls and Indicators - See CB Owners Manual.

Diesel Engine /Transmission Operation

Proper operation and maintenance are key factors in determining the useful life and operating economy of a diesel engine. Follow these directions for trouble-free, economical operation.

To Start Engine

Detroit Diesel Engines will start at temperatures above 0 degrees F ( - 12 degrees C) without using a starting aid. However, for colder temperatures it may be necessary to activate the engine block heater (120 volt ac-operated) to heat the crankcase oil. The ENGINE BLOCK HEATER is controlled by the battery heater breaker. Remember to set the breaker OFF when the heater is no longer needed.

  1. Place transmission in NEUTRAL.
  2. Turn ignition switch to START. Engine should start within 5 seconds. If engine fails to start within 30 seconds, release the starter switch and wait 60 seconds to allow the starter motor to cool before trying again.
  3. As soon as the engine starts, reduce engine speed to low idle. After normal oil pressure is indicated, HIGH IDLE may be used to build up air pressure more rapidly.
  4. Do not apply a load to the engine or increase engine speed until oil pressure gauge indicates normal.
  5. Operate the engine at low load until all systems reach operating temperatures . Check all gauges during warmup period.

Remote Engine Starting

Because it may sometimes be necessary to start the diesel engine remotely, a separate key switch is located on the right side of the engine compartment. This ignition switch has no accessory position; only OFF-ON and START positions can be used. Be sure the hinged switch cover is snapped back in place after key withdrawal to prevent moisture damage. Toggle switch must be down (REAR) to start from engine compartment.

To Stop Engine

Caution Before stopping the engine, operate at low idle for a minute or so. This will allow hot areas in the engine to cool ·gradually and extend engine life.

With the vehicle stopped, apply the parking brake and place the transmission shift lever in NEUTRAL. Turn the ignition switch to the OFF position. This shuts off the fuel supply to the engine.

Using the Allison Transmission Brake /Retarder

Your Wanderlodge is equipped with a transmission brake/retarder for your safety and driving convenience. The retarder system is energized by an OFF/ON switch on the shifter panel (see figure 2-5). There are two methods of activating the system (putting it to work):

  1. Depressing the brake treadle
  2. Downward movement of Retarder Hand control

Either of the above actions will result in transmission retarder braking action and illuminate the blue indicator light at the dash OFF/ON switch.

Retarder braking effort is proportional to hand control or brake treadle movement. The cruise control will automatically disengage when the retarder is activated. If after braking, you would like to pick up your original cruising speed, press the RESUME-ACELL switch to the RESUME position for two seconds.

When operating the retarder observe transmission retarder and engine temperature at all times. If transmission retarder temperature exceeds 330°F reduce vehicle speed and manually select a lower gear.

On extremely long down grades, water (coolant) temperature could exceed recommended limit (220°F.). Under these circumstances, reduce vehicle road speed with service brakes and downshift to increase engine RPM.

The function of the retarder is to provide auxiliary braking in all conditions by combining both hydraulic and clutch pack retardation capabilities. The retarder is installed on the rear of the transmission in place of the output housing. In most applications the output retarder is applied in conjunction with the service brakes. Selecting a lower hold range position when using this type retarder is recommended for maximum effect.

Cautions: Apply and operate the retarder with engine at closed throttle only. Do Not use the retarder when road surfaces are slippery. Do not apply retarder control or de-energize the system at the master control switch. Observe transmission and engine temperature limits at· all times. Select the lowest possible transmission range to increase the cooling system capacity and total retardation available. In the event of overheating, decrease vehicle speed to reduce retardation power requirements . Observe the retarder "ALERT LIGHT" to ensure that the vehicle control system is functioning properly.

Trailer Hitch

Hitch capacity is 10,000 pounds tow and 1,000 pounds tongue weight. Note Trailer hitch ball capacity is 6,000 pounds. Nut must be torqued to 200 ft.- lb. Towing Two towing eyes are provided behind the upper part of the generator door. Remove the two door side covers (panels) for access.

Caution Do not tow a vehicle equipped with Allison automatic transmission unless the drive shaft has been removed, or the rear wheels raised from the ground. Do not attempt to tow unit by front axle or cross-member. Damage to wiring and/ or air lines can result because of proximity of these items to front crossmember/ Do not tow with generator tray extended. Do not tow by the bumpers. Air pressure is required to release brakes.

Transmission Operation

The Detroit Diesel Allison transmission (8V92 engine) provides four forward ranges and one in reverse. Speed selection is provided through the transmission shift panel. The selector must be in N (neutral) position when the engine is started . If the engine can start in any other position , the neutral start switch deficiency should be corrected as soon as possible. Use D position for all normal driving conditions so that the coach begins moving in first gear and upshifts automatically into 2nd, 3rd , and 4th gears. As the coach slows , the transmission automatically downshifts to the correct gear. Use a low gear 2 or 3 when road, load or traffic conditions make it desirable to restrict automatic shifting to a lower range; or use the Allison transmission retarder , as .J previously described . Use 1 or 2 when pulling through mud and snow or driving up steep grades (See table 8-3 for gradeability) . The vehicle should be completely stopped before shifting into reverse.

Driving Tips

Accelerator Control

Foot pressure on the accelerator pedal influences the automatic upshifting or downshifting within each driving range . When the pedal is fully depressed against the floor pedal stop , the transmission automatically upshifts near the recommended governed speed of the engine . A partially depressed position of the pedal causes the upshifts to occur sooner at a lower engine speed. This throttle-modulation method provides the accurate shift spacing and control necessary for maximum performance.

Downshift Control

The transmission can be downshifted or upshifted , even at full throttle, and, although there is no speed limitation on upshifting , there is a limitation on downshifting and reverse . Good driving practices indicate that downshifting should be avoided when the vehicle is over the maximum speed attainable in the next lower gear . Allison transmissions incorporate downshift inhibitors to prevent harmful shifts when the vehicle is traveling too fast for the next lower gear. If downshifts are attempted at excessive speeds , the inhibitors prevent the selected downshift until the vehicle reaches an acceptable speed.

Transmission Oil Temperature

Extended operation at low vehicle speeds, with the engine at full throttle , can cause excessively high temperature in the transmission . These temperatures may tend to overheat the engine cooling system as well as cause possible damage to the transmission. If excessive temperature is indicated by the engine coolant temperature gauge, stop the vehicle and determine the cause. If the cooling system appears to be functioning properly, the transmission is probably overheated. Shift to N and accelerate the engine to 1,200 to 1,500 RPM . This should reduce the oil sump temperature to operating level within a short time. If high temperatures persist , stop the engine and have the overheating condition investigated by service personnel.

Caution Do not operate the engine for more than 30 seconds at full throttle with the transmission in gear and the unit stationary. Prolonged operation of this type will cause the transmission oil temperature to become excessively high and may result in severe overheat damage to transmission components . Do not leave transmission in drive for more than 5 minutes while stationary because of heat damage. If the transmission overheats during normal operation , check transmission oil level.

General Information - Detroit Diesel Engines

Caution Cooling fan is driven by hydraulic pressure. Flow is controlled electrically by a thermostat which senses engine coolant temperature. Any time the engine is running the fan may engage and start without warning. Also, on hydraulically driven fans, the fan may start and run for several seconds when the engine is shut off or if electrical power is interrupted. Shut off engine and wait for fan to stop before servicing. When inspecting or servicing engine or other components in engine compartment the engine control switch must be placed in OFF or REAR position to prevent starting of the engine from the driver's area.

Check crankcase oil level before starting and when refueling. Always check oil level with engine stopped . The dipstick has 2 markings , FULL and LOW , and the distance between them represents 4 quarts (3.8 litre) for the 6V92 and 6 quarts (5.75 litre) for the 8V92 engine . Refer to table 8-2 for recommended oil. • Check (with engine stopped) drive belts for cracks, breaks and frayed edges. While checking belts, look for oil, water or fuel leaks. • Check (with engine stopped) for water in the fuel. Drain a cupful of fuel from the bottom of the tank to remove water or sediment. Fill fuel tanks after completing a run. Partially-filled tanks will collect moisture if the coach is allowed to sit for an appreciable length of time. Use number 2-D diesel fuel (with a minimum Cetane number of 40). Keep fuel clean . Inspect Racor filter bowl periodically and observe WATER-IN-FUEL indications on the dash gauge. Remove and clean filter bowl as necessary . Number 1-0 diesel fuel may be used in cold temperatures or when operating in altitudes above 5,000feet. • Check coolant level (with engine cool and off). Fill to the proper level with water and permanent-type anti-freeze. Use clean water that is low in scale forming minerals, not softened water. Leave space for expansion. (Note that Nalcool 2000 is compatible only with ethylene-glycol base coolants.)

Racor Fuel Filter

A Racor fuel filter is incorporated in the diesel fuel supply line and processes the fuel supply for maximum purity . The fuel filter also includes a built-in preheater, which operates from the 12-volt battery supply and a water sensor, which lights a dash indicator when the water level in the filter bowl is high enough to require drainage.

Fuel Line Heater

A thermostatically controlled fuel line heater is located between the tank and the engine.

Leveling Jacks
Leveling Jack Control Diagram.png

The motorhome is optionally equipped with, four heavy-duty leveling jacks; one at each corner of the chassis. Because the rear leveling jacks must extend or retract a greater distance than the front jacks, their operating cycle takes appreciably longer. Overall system operation is controlled and monitored at the leveling jack controls, while each jack is independently operated by one of four respective EXTEND-RETRACT levers located on the floor to the left of the driver, figure 2-20. A dash indicator and a buzzer (when ignition switch is on) provide visual and audible signals to show that the associated leveling jacks are not stowed to a safe travel position.

Caution Severe injury or death may result. DO NOT use the leveling system for changing tires or working under the vehicle. Keep the rear wheels in firm contact with the ground with the parking brake set. With the leveling jacks extended, there is a possibility the vehicle may move either toward the front or the rear.

Operating the leveling jacks

Note 12 Volt master switch must be on to operate leveling jacks.

  1. Set LEVEL MASTER switch (see figure 2-20) to ON position. Note that the LEVEL WARNING indicator will light. LEVEL SYSTEM indicators LF RF. LR and RR are lit only when the respective corner of the coach is low.
  2. De-pressurize the tag axle by setting TAG DUMP switch to DUMP : de-pressurize front and rear axle by setting associated SUSP. DUMP switch to DUMP. Caution Always dump tag axle air pressure before the front and rear suspension and pressurize it after the front and rear suspension to avoid damage to tag axle suspension
  3. Lower the front leveling jacks by setting the LF and RF floor controls to EXTEND position . As soon as the jacks contact the ground , as indicated by the characteristic landing gear thump , release the respective control lever to prevent further jack movement.
  4. Operate the EXTEND-RETRACT levers for 'the rear leveling jacks (LR and RR) as necessary to level the rear end of the coach. The blue LR and RR LEVEL SYSTEM indicators will extinguish when the respective corners are leveled .
  5. Operate the EXTEND-RETRACT levers for the front leveling jacks (LF and RR) as necessary to level the front of the coach.
  6. To re-stow the leveling jacks prior to moving the coach , start engine to initiate air compressor operation , re-pressurize the air suspension system for the front, rear and tag axle by setting the associated DUMP switches to the FILL (up) position, in the following sequence. First pressurize front and rear axle suspensions by setting the associated DUMP switch to FILL position; then pressurize tag axle by setting the TAG DUMP switch to FILL position. Check that AIR PRESSURE REAR and AIR PRESSURE FRONT gauges each read between 100 psi and 120 psi; check that TAG AXLE PRESSURE gauge reads 50 psi.
  7. When the air suspension is once again stabilized, pull all four leveling jacks controls back to the RETRACT (locked) position. The red warning indicator will extinguish when the jacks are in the stowed position. Note If the jacks are not withdrawn before driving away, the buzzer will sound. Caution Do not drive the coach unless the tag axle is correctly pressurized to assure even weight distribution. There must be pressure in Tag Axle air bags to prevent flat spotting of Tag Axle tires during brake application.
  8. Set LEVEL MASTER switch to OFF position. This completes one full operating cycle tor the leveling jacks system.

Living Area Facilities (Interior & Exterior)

This section provides information on operation of the appliances and systems which contribute to the comfortable living conditions within your motorhome.


Your Wanderlodge sofa converts into a double bed sleeper. The sofa converts in much the same way as a sofa bed in your home. Pull up and out on the seat until the sofa is fully extended and the back of the sofa is lying in the flat position. To fold the sofa back up into the sitting position pull up on the sofa seat and at the same time push in on the sofa seat until the sofa is locked into the sitting position .

Dinette Area

1989 WB 40 Dinette Area Photo .png

The dinette area , figure 3-1 includes the area thermostat , Gas/Smoke Alarm , Systems Monitor Panel and four place bench type dinette which converts into a 3/4 size bed. To convert dinette into bed you must first lift up and remove the back cushions from both sides of table, lay these cushions to the side. Next unsnap and slide the bottom cushions toward the back rests. While holding table up reach underneath the table to unlock and fold leg under table. Raise end of table up to remove table top from wall brackets and lay table top into place on dinette base. Place back cushions in open space on lowered table top and dinette base . To convert back to dinette just reverse order of steps above .

Galley Facilities

The galley, figure 3-2 , includes a double sink , food center , refrigerator /freezer , two burner gas cooktops and micro/convection oven. The refrigerator operates from the LP gas supply, from the 120 volts ac supply, or from 12 volt alternator output while in transit. The cooktop also operates from the LP gas supply , Operating procedures for these appliances , given in the following paragraphs assume that the main LPG valve is on. An LPG leak detector, located under the rear dinette seat continuously monitors the area for LPG leakage , shutting off the LPG supply and sounding an alarm if leaks are detected.

1989 WB 40 - Manual Galley Photo.png


1989 WB 40 Refrigerator Controls Manual Picture.png

Understanding just how the refrigeration process operates will help to explain one of the important reasons why it is necessary to level a parked motorhome. The gas-fired (or electrically-heated) boiler converts the ammonia -water solution to distilled ammonia vapor, which is carried to the finned condenser, where it liquifies. The liquid flows to the evaporator , where it creates a cooling effect by evaporating into a circulating flow of hydrogen gas. If the evaporator coil is not level, the liquid accumulates, form ing pockets which do not readily evaporate and impair or block gas circulation, inhibiting the coo ling process. When the coach is parked, it must be leveled to assure comfortable living accommodations . The refrigerator will then also perform well. Place a bubble level (furnished with unit) on the freezer shelf. When the vehicle is moving , the continuo us rolling and pitching movement will not affect the refrigerator as long as the movement passes either side of level; but when the coach is parked, the refrigerator must be level (within 6 degrees).

Operation: Before starting the refrigerator , check the gas valve in the piping. Do not forget the valve on the rear of the refrigerator.

  1. To start the refrigerator set switch 7 to position On. Light 10 shall now be green.
  2. Turn the thermostat knob inside the cabinet to suitable setting, e.g. start with normal position.
  3. To shut off the refrigerator set the switch 7 to position Off.

General Information on the Operation of the Refrigerator This refrigerator is equipped with an Automatic Energy Selector (AES) system. The control system selects the most suitable available energy source. The selection will be made with highest priority to 120 V AC , second priority is to 12 V DC from the alternator , and lowest priority has gas operation . No manual operation is necessary for change of energy source unless desired . The automatic energy control will, when switched on, start up in AES mode. The AES mode follows the above mentioned priority list and will select the best energy source available.

Note The refrigerator also has a built in Battery Protection System.

With this feature, battery voltage will not be allowed to energize the 12V. heater coil until there is 13.6 volt at the + terminal of the refrigerator. This means that not only must the ignition switch be on but the alternator must be providing charging voltage to the batteries. This was designed to prevent burnout of a marginally rated alternator with consequent battery discharge and premature travel termination (highway breakdown). If, after starting, there is so much of a coach load that the alternator can't put out 13.6V. then the refrigerator will not go into the 12V. mode but run on L.P.G. only.

If the coach was previously plugged into shore power and had the L.P.G. shut off (either at the refrigerator or main valve) then the unit would not operate while in transit. There must be LPG available for refrigeration assurance. Lamp 1LR will come on if there is no gas light up. Whenever this light comes on there is no refrigeration as LPG is the lowest priority.

When the alternator provides voltage in excess of 13.6, the unit will ope rate satisfactorily with the 12V. heater. If, however , because of some additional load during travel , the voltage should drop below 11.6, then unit will switch to LPG. See Refrigerator Owner 's Manual for complete operating and care instruct ions.

Gas Cooktop

1989 WB 40 Manual Figure 3-4 Gas Cooktop.png

The gas supply for the cooktop burners is provided from the LPG tank. Make sure that the main valve (on tank ) is turned On before use. The cooktop is equipped with an electric igniter instead of pilot light.

Lighting Cooktop Burner

  1. Depress knob and turn counter clockwise to HI position . Note - A faint popping noise will be heard during step 1.
  2. After burner has lit, turn knob a few degrees clockwise until popping stops.
  3. Turn knob to desired setting.

Microwave/Convection Oven

1989 WB 40 Manual Figure 3-5 - Microwave Control Panel.png

The microwave/convection oven provides programmed microwave cooking , convection operation for crisp, even browning, or a combination of both. Caution Notes

  1. Unlike microwave-only ovens, all microwave/ convection ovens have a tendency to become hot on the cabinet and oven door, as do conventional range ovens and convection-only ovens. Be careful when touching parts other than the handle or control panel during or immediately following cooking that uses convection heat.
  2. Do not cook eggs in the shell. Steam builds up inside the shell and it may explode from pressure. Shelled hard-cooked eggs should be sliced or cut up before reheating in the microwave oven. You may hard-poach eggs for salads and casseroles.
  3. Pop popcorn only in special microwave poppers, following manufacturer's directions. Do · not use oil unless specified by the manufacturer, or heat longer than recommended. Never pop popcorn in paper bags or glass utensils.
  4. Do not heat oil or fat for deep-frying. the temperature of the oil cannot be controlled and it may overheat.
  5. Do not attempt to can in the microwave oven as it requires prolonged high temperatures .
  6. Do not operate the oven empty.
  7. Remove wire twist-ties from bags before placing in oven.

This oven uses a microprocessor, the electronic brain that provides a wide variety of cooking programs which could not be achieved by conventional control methods. The operation of the oven is controlled by touching the appropriate pads arranged on the surface of the control panel, figure 3-5. The lighted digital readout will display the cooking time, convection temperature , sensor or compu-cook setting, or time of day, and indicators show the variable cooking setting or cooking function you have programmed. See owners manual for operating instructions.

CORIAN Counter Tops

Even stubborn stains - such as grape or beet juices - wipe off with a damp cloth and household cleanser . Because CORIAN is solid all the way through , it cannot be harmed by abrasive cleansers and normal household cleaners.

CORIAN is strong and tough , but slicing on it with knives can cause scratches. Use a cutting board.

While CORIAN does provide an extra measure of protection (better than ordinary countertops), it is not recommended as a hot pad. Do not place hot pots and pans directly on your CORIAN countertop .

Since it's a solid material with color and pattern all the way through, unusual damage such as cigarette burns , scratches , or other surface abuse can usually be removed using ordinary household cleansers or fine sandpaper. If the stain persists, or if the scratch is particularly deep, first use a medium sandpaper (120 or 240 grit) then fine sandpaper (320 or 400 grit) followed by circular motion buffing with a scotch Brite pad to match the gloss of adjacent surfaces. Household cleanser , steel wool or DuPont No. 7 polishing compound can also be used if higher gloss levels are needed.

Caution: Certain chemicals found in the home - such as paint removers, paint brush cleaners, acid drain cleaners and certain brands of nail polish and polish removers - can harm CORIAN if left in contact even for short periods of time. These materials should be wiped away promptly and flushed with water. Depending on time of exposure, surface damage caused by these materials can sometimes extend too deeply for practical repairs.

Food Center

1989 WB 40 Manual Figure 3-6 - Food Center.png

A built-in variable-speed motor-driven unit , figure 3-6, may be used with blending attachments for a large variety of food preparation tasks . The food center is designed for ac operation and is operable only when the generator is on ; or when coach systems are connected to an external shoreline hookup.


Water Pump Switch Two Water Pump On-Off switch/indicators are provided for separate control of water pump operation. One switch is located on the control panel In the galley area ; the second is located in the bathroom. The pump may be operated On or Off from either location. The associated indicator is lit whenever power is being supplied to the pump. Setting either switch On pressurizes the water system, with the pump operating on demand to maintain constant pressure . Continuous or erratic pump operation can indicate an empty water tank, system leakage , or air lock in hot or cold water lines. (Air locks are normally caused by movement of water in the tanks during pump operation.) Since tank water level and water pressure can vary with road movement , leave water pump switch Off while the coach is moving. The water pump and air accumulator are located in the bed base cabinet.

Tub Unit

The tub unit includes a pressure-balancing single mixing valve, tub water spout with shower wand diverter button , shower head and drain lever.


1989 WB 40 Manual Figure 3-7 - Toilet.png

The toilet , figure 3-7, operates from the fresh water supply , flushing wastes directly into the sewage holding tank. The double-flush foot pedal located at the bottom of the bowl controls the amount of water delivered into the bowl and opens the sliding valve to the tank. After use, depress bowl drain pedal until water swirls , draining wastes into tank, then release pedal. A water-save r feature, consisting of a manually-operated spray hose, is located inside cabinet at side of bowl. To raise the level of water in the bowl, press on the small foot pedal. A water shut off valve is located in supply line to toilet and used to stop water flow to toilet.

Vent and Exhaust Fans

Fans are located in the galley and bathroom. These fans have controls built into the housing. The lid must be raised to desired position before fan is turned on. The fans can be used as exhaust fans by pressing the OUT side of rocker switch or as a vent fan by pressing the IN side of rocker switch.

Heating Systems

Three types of comfort heating systems are used in your motorhome: gas/hot air heat; electric heat; and engine hot water circulating heaters. Two gas/hot air furnaces are used in the coach. Each unit has a separate zone thermostat, figure 3-9. One furnace is located in the living room, another is in the bathroom area. The bathroom furnace is also used to supply hot air to the bedroom via a separate duct.

Separate heating can also be provided by circulating hot-water heaters (chassis heaters) when the engine is operating and the Winter-Summer Heat Selector switch (located on the pilot's area overhead dash) is in Winter position. These heaters share the area thermostat with the LPG furnace.

Four electric convection heaters (120 volt) are located in the bedroom , bathroom , galley area, and living area. On-Off thermostat switches are located on each heater. Three freeze-protection heaters (120 volt) are used to protect plumbing and water supply tanks.

Gas/Hot Air Furnace

To operate the furnace, proceed as follows:

  1. Turn manual gas valve (at furnace front) to Off position.
  2. Set thermostat above room temperature. A 1 O seconds delay will occur before the blower starts.
  3. Allow blower to run for five (5) minutes for combustion chamber purge cycle.
  4. After five (5) minutes , set thermostat to the OFF position.
  5. Turn manual gas valve to ON.
  6. Set thermostat on desired temperature.
  7. Allow 24 seconds for ignition to occur.
  8. If burner does not light, set thermostat on OFF and repeat steps 1 through 7.
  9. If after three (3) attempts with no ignition , go to shutdown and contact a qualified service agency. Do not continue to cycle furnace through thermostat in an attempt to get ignition.

When coach temperature drops below the thermostat setting, the internal relay contacts close to operate the blower. The air flow created by the blower closes an air-actuated switch that, in turn, energizes the main burner gas line solenoid valve which then lights from the electronic ignition.

Caution Do not store items in or near the burner compartment.

When the coach temperature exceeds the thermostat setting , the relay contacts open. This shuts off the burner gas supply but the blower continues to operate until residual heat within the furnace is dissipated , when a thermostatically-controlled relay turns off the blower. Air for the sealed combustion chamber is pulled in from outside the coach, routed around the heat exchanger , then exhausted through the outside vent. Recirculated fan-forced air blowing across the heat exchanger is used to heat the coach interior.

Switch at bottom of thermostat must be Off (to left) if operation of furnace at lower temperatures is not desired.

Hot-Water Heating Systems

Five sources of hot water heating are provided which depend on heat generated from engine operation. One heater (90,000 BTU), which serves the pilot's and co-pilot's area, is controlled by-the Front Heat switch on the dash ; and three chassis heaters , (50,000 BTU) under the dinette seat, livingroom sofa and in the bedroom rear storage area, are controlled by the thermostat in that area. The bathroom chassis heater (15,000 BTU) is controlled by the bathroom thermostat.

The engine coolant is normally routed through the engine cooling system and the water heater, which also can be heated electrically, to provide the hot water supply for the coach. However, by operating the Winter-Summer Heat Selector switch , the engine coolant can also be diverted through the previously-mentioned area heaters, via a solenoid valve. The coolant level in the engine radiator should be checked after these valves are opened. Note that two pumps are used to circulate hot water through the coolant lines. One pump is controlled by the Aux. Pump switch (located on the pilot's overhead dash), the second pump is turned on automatically whenever the Front Heat switch is on.

Chassis heater blower motors (dinette seat, front sofa and bedroom rear storage area), are controlled by On-Off Heat switches adjacent to the heater louvers as well as the area thermostats . HILO blower speed switches are also provided. The front heater is equipped with three squirrel-cage dual-speed blowers, operated from separate dash controls. One blower provides defroster air; one provides air to the pilot's side; the third provides air to the co-pilot's side. Use Defrost Hi-Off-Low switch for setting the defroster blower speed; use the left and right Hi-Off-Low Heat switches to control air flow to the pilot's and co-pilot's sides, respectively. To supply heat, the dash Front Heat switch must be On.

Note If additional defrosting action is needed, turn auto air conditioning temperature control to the warmest position and turn auto air conditioning fans to high speed. This will circulate additional hot air about the windshield area.

Engine heat is picked up by the engine coolant which is pumped through the heaters inside the coach and back into" the engine. A typical heater consists of a heat exchanger, or core, and a fan which moves the air across the core, transferring heat from the engine coolant into the room.

Heating System Operation

Satisfactory performance of the hot-water circulating type of heating system depends on the following conditions:

  1. Engine Coolant Temperature - Coolant temperatures vary between 180 and 195 degrees F, during normal engine operation.
  2. Coolant Flow - Coolant flow varies with the engine speed. Setting the Aux. Pump switch (located on the pilot's overhead dash) to On turns on the auxiliary pump (located in the engine compartment) to increase the coolant flow through the system. This feature may also be used to reduce engine overheating during normal driving conditions .
  3. Proper Fan Operation - All fan motors are two speed and can easily be checked for proper operation by listening to tli e motor speed change as the switch is operated.

More heat will be generated by the engine when it is also used to move the coach. Be sure that the engine radiator is full and that all coolant flow valves are open. Warm engine to operating temperature and set heating system switches as follows:

  1. Winter-Summer Heat Selector to Winter positon
  2. Aux. Pump to On
  3. Front Heat switch to On
  4. Left and right Heat blower switches to Hi or Low
  5. Thermostats to desired temperature.

Electric Heaters

Electric forced-air heaters (120 volts) are located in the bedroom, bath, galley and living room areas. Each heater is controlled by a combination On-Off switch /thermostat. Heater operating voltage is provided from the same switches which control the air conditioners. Air conditioner On-Off toggle switches , on the TV control panel above the pilot , must be in On position and individual A/C switches Off.

Freeze Protection Heaters and Heat Tape

Freeze protection heaters (120 volts) are thermostatically-operated to turn on and protect the water supply tanks and associated plumbing in the event that temperatures drop below 40°. Two heaters are used ; under the kitchen sink; and within the bed base cabinet. Thermostatically controlled heat tape (120 volts) are run on the copper water tubing and then wrapped with insulation . Heat tapes start to heat at 36°F and stop at 43°F.

Note This freeze protection will greatly decrease the chances of frozen water lines provided the coach is plugged into outside power (one SOA. or two 30A. power cords) or the generator is run continuously during cold weather periods.

Air Conditioners

1989 WB 40 Manual Figure 3-10 - Roof Air Conditioner.png

Three 13,500 BTU roof air conditioners located in the living room and bedroom. The 12 volt master ON/OFF switches are located on the pilot's left overhead control panel. Fan and thermostat controls are located on the roof air conditioners. Each air conditioner is equipped with a 1,000 watt heat strip.

Systems Monitoring and Control Panel

1989 WB 40 Manual Figure 3-11 - Systems Monitoring and Control Panel.png The systems monitoring and control panel, figure 3-11 , is located on the rear dinette wall. This one panel provides a convenient means of displaying inside and outside temperature, time , level of potable water supply , holding tanks, and LPG supply, as well as other monitoring and alarm functions discussed in the following paragraphs.

Water Pump - The water pump switch is one of two switches that can be used to turn the water pump on or off. The ON indicator will be lit when power is being supplied to the pump.

Refrigerator Alarm - When the switch is on the refrigerator temperature is being monitored. Normally , the ON indicator is lit; if the refrigerator temperature increases to an unsafe level , the WARM indicator lights with an accompanying audible alarm.

Gas/Smoke Alarm - The gas /smoke alarm is a gas leak detector designed to sense dangerous concentrations of LP gas or carbon monoxide within the coach. There are four (4) sensors mounted at floor level (LP gas is heavier than air) for the three furnaces and the refrigerator . One sensor is located above the 120 volt ac distribution panel (Load center) to monitor carbon monoxide. Carbon monoxide , of course, is the most deadly of the products of combustion. It will provide an alert in the event of a short circuit at the load center. The alarm has been factory-calibrated to an alarm point of 2,000 PPM propane for standard conditions (temperature, 20 degrees C + I - 2 degrees ; relative humidity 65% + /- 5%. This provides for a minimum of false alarms consistent with providing reasonable safety .

To turn on the unit, set On-Off switch to On and observe that Power On indicator is lit. Excessive propane PPM conditions are indicated by the sounding of the audible alarm and lighting of an indicator associated with the danger area. The alarm, if left turned off for a period of time, has a warmup period of about one minute. During this time , the alarm may sound. This is a normal response and should stop once the unit is warm.

Clock/Thermometer - The clock/thermometer provides , on demand , a digital display of inside and outside temperature, digital time display , and an alarm function . Operate the panel controls as follows:

  1. Monitor inside or outside temperature (°F) by pressing the Temp In or Temp Out buttons. There is an internal adjustment , at the rear of the unit, which may be used to calibrate the temperature readings. (Calibration of this unit is described in Section VIII.)
  2. Set the clock by depressing the Fast or Slow Set button until the correct time is shown. PM is indicated by lighted dot in the upper left corner. The dot in the center of the display marks the seconds.
  3. Set alarm as follows : depress Alarm Display button then depress the Fast or Slow button to set the alarm time. Dot in upper left corner will light when alarm is set for PM. After setting the alarm , release Alarm Display button to return to the normal time mode. To activate the alarm feature , depress Alarm On/Off button to On; to shut off the alarm, depress Alarm On/Off button and release so it pops out to Off. Note When 12 V. power has been interrupted (batteries disconnected or Electronic Master switch turned off) clock display will flash "12:00". Reset clock to eliminate flashing. Alarm will also have to be reset.

Tank Monitor - The Tank Monitor panel provides an illuminated readout of the content level of the pure water , gray and waste water tanks, and the LPG tank level. When full, each of these tanks has the following capacity: pure water supply , 116 gallons (See Table 8-4); gray water holding tank, 100 gallons ; body waste tank, 100 gallons; and LPG tank , 43.5 gallons (148 lb.). Use the features of this panel as follows:

  1. Monitor Pure, Gray or Waste Tank levels by depressing the respective button. The content level remaining in the tank is indicated by five sets of lit readings . The E lamp, at the left of the display, is lit all the time ; if the next indicator is lit, the level is approximately 1 /4 tank; if the center indicator is lit, tank level is between 1 /2 and 3/4 full ; if the 3/4 indicator is lit, tank level is between 3/4 and full; and if the F indicator is lit, tank level is full. If only the E indicator is lit, the tank level is between empty and 1 /4.
  2. LPG tank level can be monitored in the same manner as the water tank level by depressing the Propane Tank button. Note that this display is pre-calibrated. However, if it is necessary to recalibrate the display, this can be done when the tank is full by setting a rear-panel adjustment. Note that the display will read Full when the LPG tank float reads 80% because the remaining 20% volume is needed for expansion.

Waste Odor Control Panel - This panel controls the cycling and electrolysis action of two pairs of stainless steel electrodes contained within the body waste holding tank. A 12-volt current is passed between each pair of electrodes for a 16- minute On period (green LED); and switched off for a 48-minute Off period (red LED). For each cycle, the current is reversed so that the electrolytic action does not excessively erode the steel electrodes.

As current flows through the waste liquid, it oxidizes the organics and eliminates associated odor. To increase odor control effectiveness , a tablespoonful or two of salt may be added through the toilet if desired.

The electrodes (probes) are replaceable.

Generator Switch - The generator Start-Stop switch provides the same features as the generator switch located above the driver. Press switch to Start position and hold until generator starts as shown by the switch indicator light. Press switch to Stop to shut-down the generator (light extinguished) . Press switch to Stop (and hold for pre heat).

LP Gas Leakage Detector

The gas leakage detector, figure 3-12, is located beneath the rear dinette seat. In the event of an LP leak, the unit sounds an alarm and closes down the main LPG supply by activating the leak detector solenoid shutoff valve located in the gas line just after the low pressure regulator. If it is necessary to reset the solenoid (red band is visible inside clear plastic valve housing), open the outside refrigerator vent compartment door, remove plastic housing by gripping locking levers and lifting upward, push valve plunger down until it remains down, then replace the cover. To test alarm operation, press the test switch located on top of the detector unit. Alarm must sound for at least 15 seconds before the shutoff valve will be activated.

Electronic Door Chime

The door chime is located in a removable compartment in the right hand overhead storage compartment, figure 3-13. The door chime can be preset to play any one of 60 different tunes when the doorbell button is pressed. As shown , all controls for tune selection, volume, tone and tempo are easily accessible. Tunes may be selected as follows:

  1. Refer to tune index, at bottom of chime, and note the code number for the desired tune. For example, "William Tell Overture" is identified by DB.
  2. Press in the left-hand tune selector button and move into position D.
  3. Press in right-hand button and move it to position 8.
  4. Press test button to play selected tune and adjust volume , tone and tempo as desired. Note that tunes identified with an asterisk (*) will play longer if the button remains depressed. Caution: Do not use a lighted door button with this chime or chime may be inadvertently activated.

Portable Fan

1989 WB 40 Manual Figure 3-14 - Portable Oscillating Fan.png

The portable oscillating fan is shown in figure 3-14. The 12-volt hookup cable is coiled within the base section when the fan is not in use. This will supply air circulation within the coach when it is too cool for air conditioning.

Security Timer

1989 WB40 Manual Figure 3-15 - Security Timer.png

The Watchdog security timer, figure 3-15, is a randomly -switched electrical timer which can be used to control the on-off operation of an appliance , light, etc., to give your coach that 'lived-in' look when it is unoccupied. The three-position switch may be set to OFF, to shut off the controlled appliance; to ON, for manual control; or to Security, for random operation.

Burglar Alarm / Anti-Theft

Features The security of your motorhome and contents are assured by an intruder alarm system which protects windows and entry door. Eac.h window is protected by a magnetic proximity switch which triggers an alarm if the window is opened. The entry door uses a door jamb switch which operates when the door is opened. When the system is secured it may be activated from outside the coach by a key-switch adjacent to the entry door. From inside the coach , a master burglar alarm switch may be operated at the front instrument panel.

In addition to the alarm system, an anti-theft switch for the ignition circuits (A/T switch on dash) can be operated so that the unit cannot be started . Lastly, the 12 volt Master switch (hidden behind the right'side of the dash) can be operated to turn off all but essential 12 volt circuits.

Fire Extinguisher

A portable, multi-purpose dry chemical fire extinguisher is located under the aisle end of the dinette seat. A second fire extinguisher is located in an outside coach compartment. To use, release the clamp and remove the fire extinguisher from the bracket , pull safety pin from handle, squeeze handle and apply chemical under flame.

Smoker Detector

A smoke detector (now code mandated) is installed in a ceiling location just outside the entrance to the bedroom area. Operator instructions ~ are attached inside the overhead cabinet where the warning label is displayed on the exterior door trim.

It is possible for the smoke detector to be activated by the cold air coming from a roof air conditioner outlet. Slight downward rotation of the outlet louvre is all that is necessary to discontinue activation.

Bedroom Overhead Panel

1989 WB40 Manual Figure 3-16 - Bedroom Overhead Panel.png

The bedroom panel is directly above the head of the bed, which contains the following:

Generator switch - is used to start or stop generator.

Lights switches - Night switch controls the aisle lights and Flour controls the fluorescent lights in bedroom only.

Alarm Clock - see Systems Monitoring and Control Panel.

Security switches - Lock switch controls the deadbolt entrance door lock. Light switch illuminates front and rear landing lights, driving lights and rear Halogen parking lights.

Fan switch - master switch for vent fan in bedroom.

Stereo - the Jack is used for privacy headphone use and Volume controls the sound level.

Drape switch - opens or closes the drapes on the side of bedroom pointed to , when optional electric drapes are used.

Gas Grill

1989 WB40 Manual Figure 3-17 - Gas Grill.png

The L.P.G. grill is stored in compartment above the L. P. G. tank .

  1. Remove the three foot length of L.P. gas hose, with quick disconnect fittings , from within the grill and attach the end of the hose with the male fitting to the female quick disconnect fitting coming from the L.P. gas tank.
  2. Pull the grill on its carrier as far out from its storage compartment as the slides will allow.
  3. Connect the female fitting on the three foot L.P. gas hose to the male fitting at the rear of the plumbing enclosure box on the right side of the grill carrier.
  4. Open the main valve from the L.P. tank and the valve between the pressure regulator and the quick disconnect.
  5. The grill is equipped with a Piezo Electric Spark Generator that may be used to ignite the grill. The grill may be ignited by opening the top cover and pushing in on the gas valve and turning it counter-clockwise 90° to the full on position. Then , depress the red button on the electric spark generator to discharge a spark that should ignite the burner. If ignition does not occur the first time the red button is depressed, repeat depressing the red button until ignition does occur. Caution Do not grasp the black body of the electric spark generator when depressing the red button because a mild electric shock may be experienced.
  6. After complete ignition has been established , it may be desirable to close the lid on the grill and allow it to pre-heat for a period of up to 10 minutes prior to the start of grilling or broiling .
  7. At the end of use , the gas valve should be turned clockwise to full OFF and the L.P. gas hose should be disconnected from the rear of the plumbing enclosure box.
  8. The grill should be allowed to cool so the castings are cool enough to touch before sliding the grill back into its storage compartment.
  9. The three foot L.P. gas hose should then be disconnected from the supply fitting and the valve should be turned off between the fitting and regulator before closing the compartment doors.


The grill may be removed from the carrier for cleaning as follows:

  1. Remove the grill cover by raising it and disengaging it from the hinge halves on the lower grill body.
  2. Lift out the cooking grate and then lift out the fire grate that holds the ceramic rocks .
  3. There are four quarter turn wing head studs in the bottom of the lower grill body that may be rotated counter-clockwise to disengage the grill body from its carrier. The grill body may be removed from the carrier by lifting the left side up and then moving the body to the left to disengage the burner venturi from the gas orifice hood.

Stepwell Cover

1989 WB40 Manual Figure 3-18 - Co-Pilot's Control Panel.png

The air powered stepwell cover is raised or lowered into position by operating the Stepwell Cover Up or Down toggle switch located on the CoPilot's Control Panel (figure 3-18) on the right side of the hood table. Also located on this panel is the Step Master switch, Step Light switch , a Stereo Jack and CB Jack with Volume control. Adjustments for the cover travel speed can be made by removing the top drawer in the hood table and adjusting the regulator and/or needle valve.

The Step Light switch makes it possible to turn off the step lights if the step is to remain in the extended position for a time.

If it is desirable for the step to be left in the extended position , for repeated trips into the coach, the Step Master may be switched.

Note When air pressure drops below 65 psi the entrance step will extend and lock into place. The step will not retract until sufficient air pressure has built up.

Supplemental Reference Material (Not in Original Manual)

Awnings - Zip Dee

Drapery Control - by Lightwood Manufacturing Inc.

Safe - La Gard

Electrical Systems

There are actually two interrelated electrical systems used in your motorhome: the 12 volt de supply system; and the 120 volt ac supply system. The 12 volt de supply system is divided into several branches , or zones , each functioning from the common 12 volt battery source. One branch provides the 12 volts required for the automotive starting, ignition and lighting systems; remaining branches supply those motorhome circuits and appliances which require 12 volts de for operation.

The 120 volt ac system includes those motorhome appliances which require 120 volts for their operation , supplied from either the internal generator , or from the external 120 volt ac (or a split 240 volt ac) supply, via the shoreline hookup. An optional inverter unit will supply 120 volt power from the coach batteries to selected circuits.

12 Volt DC Supply System

Wiring diagrams of the 12 volt supply and distribution system are included in Section X.

1989 WB40 Manual Figure 4-1 - Typical Load Center.png

The 12 volts supplied to all motorhome appliances, outlets and accessories is routed from the batteries through a main 12 volt master switch and routed through busses to the individual branches, or zones, that are serviced from this supply. Circuit breakers are located behind the access panel at the top front left side of the coach, lower front load center (behind removable panel outside front of coach) and at each of the zones. The circuits supplied and fuse or circuit breaker protection at each zone are shown on diagrams included in Section X. A typical load center is shown in figure 4-1.

Battery Heaters

120 volt ac battery heater pads provide faster engine starts during cold weather conditions by increasing the available cold cranking power. Heaters operate only from the ac supply line via the Battery Heater switched by 120 volt breaker only.

Note To avoid premature deterioration of the batteries, heaters should be used only when the temperature is below 32°F.

Battery Chargers

The 12 volt coach battery supply , figure 4-2, and the generator battery are maintained fully-charged by either the engine alternator (when engine operates); or by battery charger.

1989 WB Manual Figure 4-2 Battery Compartment.png

Batteries can become discharged because of coach 12 volt loads, while parked, without a 120 volt ac source. For overnight stops this presents no problem , with judicious use of 12v. service, because the engine alternator will recharge the batteries rapidly during the next day's travel. When operating from shoreline or generator power, the batteries obtain the major portion of the charge during "sleeping" time , while coach loads are low, so that the battery charger can "top off" the batteries . If it is planned to leave the coach parked without exterior power for two days or longer turn off the Electronic Master switch in overhead cabinet adjacent to left front load center. This will ensure that there is no drain from the circuits which remain on when the Master (under dash) switch is Off (clock, memory and LPG leak detector).

DC Supply Monitors

The ALT/CHGR METER, located on the lower dash , indicates the total current flow from the charging source (engine alternator or battery chargers).

The BATTERY CHARGE ammeter, located on the co-pilot's overhead dash, shows the current flow to or from the coach batteries.

The COACH LOAD ammeter , also located on the co-pilot's overhead dash, shows the load drawn by coach circuits.

ENG. VOLT METER , located on lower dash, shows voltage at the batteries .

While in transit, this should reflect an alternator regulated setting of 14v. When parked, with 120v. source supplied, this should read between 12.5 and 14.0v. depending upon load. When parked, without 120v. source, do not permit voltage to drop below 11.5.

After a trip, CHARGE ammeter may show some discharge reading, even when 120v. source is supplied, if there is a load on the 12v. coach circuits. The Float type battery charger allows a voltage of 12.5-13 when there is a load.

AC Supply System

1989 WB40 Manual Figure 4-3 AC Power Selector Switch.png

Motorhome ac-operated appliances are supplied from either an external shoreline hookup or from the on-board generator. Selection of shoreline or generator power source is determined by a four-position ac power selector switch located in a floor compartment between the co-pilot's seat and right sidewall as shown in figure 4-4. Set this switch to either Gen, Shore 50A, Shore 30A or Off, depending on the power source availability . Leave this switch in Off position to completely disconnect the motorhome 120 volt ac circuits normally supplied by these inputs.

Power Line Monitors

A dual power line monitor is located on the copilot's overhead dash to monitor the voltage in both legs of the ac shoreline supply (or generator supply). The monitors have a polarity and ground detector circuit to indicate possible electrical hazards due to incorrect hookups. A power line polarity monitor is located in the shoreline/utility box (figure 4-5).

AC Circuit Breaker Panels

The main ac circuit breaker panel is located in the bedroom. See figure 4-4.

1989 WB40 Manual Figure 4-4 - AC Circuity Breaker Panel.png

Generator Operation

The generator plant has its own 12 volt starting battery so that it can be started independently of the coach 12 volt batteries.

The generator can be started and stopped from any of three locations within the coach: at the driver's instrument panel, at the systems Monitor Panel, or at the bedroom panel. In addition , the generator can also be operated from the controller box in the generator compartment.

To start the generator, push the Generator switch to the Start position and hold until the generator starts, as indicated by the generator On indicator light. Do not hold switch on for longer than 5 seconds at a time! If the generator does not start the first time, wait a minute and try again. Release the switch when the indicator light in the switch glows. The generator may be stopped at any time, by holding the switch to the Stop position until the generator stops (light in switch extinguishes).

In cold weather, it is necessary to activate the cylinder glow plugs before starting. Push StartStop switch to Stop position and hold for 15 to 20 seconds.

It is not advisable to start the generator under a heavy load, especially with the high current demands made by the air conditioners. This may cause hard starting and possible damage to the generator electrical system. It is a good practice to remember to set the Power Selector switch to Off (figure 4-3) before turning on the generator so there will be no electrical load on the line. Also , remember to set the selector switch to Gen position when the generator is being used; and to reset the switch to either Off or Shore position, as appropriate.

The generator is housed within an electrically operated extendable tray. To open, operate the Out-In Gen. Tray switch in the front outer pilot's side compartment.

Caution The generator tray is heavy and moves in and out with a great deal of force. Keep Hands Off Tray When Operating Switch!

Shoreline Operation (Commercial Power)

1989 WB40 Manual Figure 4-5 Shoreline Utility Compartment .png

Shoreline Operation (Commercial Power) Set the power selector switch, figure 4-3, to Off position before the motorhome electrical system and external supply are joined. Caution Your motorhome has been wired in accordance with the National Electrical Code. All 120 volt ac wiring is two-wire service with ground; all 240 volt wiring is three-wire service with ground. If the motorhome is connected to an external hookup which has only a two-wire circuit, ground the third wire on the adapter to the external supply metal junction box or conduit. For personal safety, check the polarity detector indicators on the power line monitors to be sure that lines are properly connected and grounded.

For purposes of safety, observe all precautions when making these connections. First, connect the shoreline to the coach (rotate plug clockwise to assure firm connections) . The coach receptacles are located in the left side utility compartment shown in figure 4-5. Connect the other end of the shoreline to the power source. Set the power selector switch to the appropriate Shore position. Poor grounding or incorrectly-wired receptacles can cause personal harm as well as equipment damage or fire hazards . Check reverse polarity indicator in shoreline /util ity compartment to verify correct polarity and grounding of hookup.

In many instances, the shoreline hookups will not be rated to operate all electrical appliances in your coach. Check with facility personnel to determine the maximum current capability of the hookup . Sometimes , only one air conditioner may be operated . The current ratings for appliances designated for standard or optional (identified by *) usage in your coach are listed in table 4-1 .

Table 4-1. Electrical Rating for Motorhome Applicances
Item Current Rating (Amperes)
Air Conditioners 14,500 BTW (Start) 19.0
Water Heater 10.0
Television Receiver B&W .5
Television Receiver Color 1.0
Dattery Charger (depends on battery condition / load) 0 to 14.0
Engine Block Heater 10.0
Electric Heater - Interiro Heater 12.5
Electric Heater - Battery Heater 1.2
Electric Heat Tape 3 watts/ft
Microwave Oven 15.0
Food Center 4
Refrigerator 2.7
Ice Maker 15 Start 2.5 Run
Washing Machine / Dryer 14.0
Instant Hot Water 6.5


Your coach is designed and tested to make sure the 120v. ac Neutral (white) wire and the Ground (bare copper or green) are not tied together (no continuity). This will prevent any danger of a "hot skin" if the source of power has reversed polarity (red LED lit).

Status / Problem Cause Corrective Action
Green LEDs Normal Normal (desired)
Red LEDs Lit Reversed Polarity at power source Convince park management to correct or change lot assignment.
Neither Red or Green LEDs No ground connection with park service Use jumper lead from ground pin on shore cord to service box
Power Source (Park) circuit breaker trips Reversed polarity in park and coach neutral and ground tied together . Use on-board generator until qualified electrician can correct coach problem. (Generator polarity is correct)
Green AND Red LEDs glow when additional load is turned on (Air Conditioner or Water Heater). Poor ground connection at park (floating ground). Make sure shoreline plug is fully engaged twist locked (clockwise) at coach.

Safeline Alarm

Your coach is equipped with a shoreline disconnect alarm , which is located on the upper left auxiliary dash. This device will provide an audible or visual alarm whenever the shoreline is left connected to the coach at the same time that the ignition switch is turned On. This assures that the coach is not inadvertently driven away while still connected to the shoreline hookup.

Audio System Warning

Low-voltage audio system wiring is run throughout the coach between the stereo radio, speakers , headphone jacks , volume controls and amplifiers. These interconnections are shown on wiring diagrams provided in Section X.

Electronic Master Switch

Most of the electronic circuits are de-energized when the main Master switch (behind dash) is turned Off (relay action). Circuits that still receive power when the Master switch is off serve the monitor panel, clocks , radio memory, and LPG leakage detector. If coach is to be stored for two days or more without external power, the Electronic Master switch in the front overhead kitchen cabinet on driver's side should be turned off.

Battery Jumper Terminals

For your convenience and safety when jump starting (usually someone else's vehicle), terminal posts are provided in the upper curb side of the engine compartment. Utilization of these terminal posts is described in Section VIII.

Battery Storage in Freezing Weather

Batteries that are not kept full-charged must be given protection against freezing. Partially charged batteries will freeze at low temperatures , so batteries must either be left charged or removed from the vehicle and stored in a warm location. The motorhome can be left connected to the shoreline ac supply and the coach battery chargers will keep all batteries charged. Note that even in a warm location it is advisable to keep the batteries charged to prevent deterioration. The six· main coach batteries should be checked for proper electrolyte level: add water, as required. The battery used for the generator is sealed.

Water Distribution and Drainage

Your motorhome is equipped with a completely self-contained water system which includes piping, heating and drainage facilities similar to those used in home installations. The water supply and distribution system includes three networks: (1) a potable water supply system, which includes the water tanks, pump, air accumulator, pressure switch, water purifier and input supply lines; (2) water heater and interior hot water heating systems; and (3) waste, winterizing, quick drain and sewage drainage systems. Refer to Section X for potable water system and plumbing drainage system piping diagrams.

Water Supply and Distribution System

1989 WB 40 Manual - Figure 5-1 Water Hookup.png

As shown in figure 5-1, the dual purpose Tank Water Fill/Commercial Water inlet connection is located in a small compartment at the curb side rear above the shoreline/utility compartment. The Tank Fill On-Off switch , located in the shoreline/ utility compartment controls a solenoid-actuated water valve to divert the commercial water input to fill the pure water storage tank(s). Located beneath the rear bed(s), the tank(s) are non-pressurized types so that system water pressure is developed by pumping action directly into the supply lines, rather than by tank pressurization. A bacteriostatic water purifier system purifies all the water supplied to the coach .

Commercial Water Hookup

When facilities are available, the Commercial Water hookup can be used to supply all coach water system requirements. In this manner, the coach water tank and pump system are automatically bypassed by the supply line check valve and water pressure is developed by the external connection. Water inlet pressure is regulated to 40-psi by a valve which is part of the combination city (commercial) water fill, check valve, and regulator shown in figure 5-1.

Note: The Tank Fill switch should be On only when the water tank is being filled. This switch must be in Off position at all other times.

Filling and Sanitizing Filling the Tanks

To fill the water supply tanks , connect the water hose to the commercial water inlet, set Tank Fill switch to On, then turn on the water supply . When tank(s) is full, as indicated by water overflow beneath the coach, set the Tank Fill switch to Off position, shut off the water supply and disconnect the hose. At this time, check that the Monitor panel readout on the dinette wall indicates a full water tank. To check, press the Pure tank switch and observe that the E through F indicator segments are lit.

Sanitizing the Water System

1989 WB 40 Manual - Figure 5-2 Water Purge and Drain Controls.png

Water system sanitizing procedures should be followed before the system is used for the first time, after long idle periods, where water may become stagnant; or after any suspected contamination of the water supply. Whenever possible, use a commercially approved tank sanitizer and follow the procedures on the product package. If it is not possible to use a commercial product, prepare your own mixture and sanitize the tank in accordance with the following procedures:

  1. Empty the Water Tank(s) - To drain tank(s), set the Water Tank Drain control (on the control panel in the bed base cabinet) to Open, figure 5-2.
  2. Prepare the sanitizing solution using ¼ cup of household bleach (sodium hypochlorite solution) for each gallon of water. Use one gallon of the solution for each 15 gallon s of tank capacity. This procedure will result in a residual chlorine concentration of 50 ppm in the water system . If a 100 ppm concentration is required use ½ cup of household bleach with one gallon of water to prepare the chlorine solution. Nine gallons of solution will be most adequate for the largest tank(s) (128 gallons).
  3. Add sanitizing solution to water tank(s) - Disconnect overflow hose from tank(s) and pour solution into vent fitting. A curved piece of 1¼ I.D. hose , clamped to the vent fitting, will facilitate this process. Reconnect overflow hose.
  4. Fill tank(s) to Capacity - Connect the hose to the commercial water inlet , set the Tank Fill switch to On and fill water tank(s) completely. Shut off hose , and set Tank Fill switch to Off. Turn on water pump. Open each faucet (hot and cold) and run the water until a distinct odor of chlorine can be detected. Shut off wat er pump .
  5. Allow the system to stand for at least 4 hours when disinfecting with 50 ppm residual chlorine . If a shorter time period is desired , then a 100 ppm chlorine concentration .should be permitted to stand in the system for at least 1 hour.
  6. Drain Tank(s) - Open the Water Tank Drain control and allow the tank(s) to drain completely.
  7. Refill Tank(s)-Close the Water Tank Drain control , and turn on the water supply to the commercial water inlet, set Tank Fill switch to On and fill tank(s) completely . When the tanks are full, set Tank Fill switch to Off, shut off water supply and disconnect hose , replace fill cap and turn on water pump . When water flows from opened faucets, close them and open other faucets until water flows. This flushes the system, removing trapped air from the piping and ensures that the fresh water supply is ready for use.

NOTE: Residual tastes or odors can be removed by again draining and rinsing the system with a vinegar solution mixed to the ratio of one quart of vinegar to five gal Ions of water.

Potable Water Distribution System

1989 WB40 Manual - Figure 5-3 Water Pump Location.png
1989 WB 40 Figure 5-4 Water Purifier.png

The major components of the potable water distribution system are the bacteriostatic water purifier , water tank(s) , water pump , air accumulator , water heater, piping and fixtures . The air accumulator and water pump are shown in figure 5-3; the water purifier and water tank drain valve are shown in figure 5-4. Water Pump The water pump, figure 5-3 , is equipped with a factory-calibrated pressure control switch which is preset to turn the pump on when the system pressure falls below 20 psi; and turn the pump off when the pressure reaches 35 psi. If the pump has been out of service for a period of time , it is advisable to open a faucet before turning the _pump on. When water flows steadily from the opened faucet , close faucet and observe that pump shuts off when system becomes pressurized . (it may also be necessary to bleed the air from the other faucets as well.) When the potable water supply tank(s) level is low, or empty , shut the pump off to prevent possible damage to the pump motor. In addition to integral motor overload protection, the pump mechanism · is also protected from jamming by the presence of an in line filter (pump guard) between the pump and the supply tank .

Water Purifier

The bacteriostatic water purifier, figure 5-4, filters and purifies the potable water supply to eliminate tastes , odors and coloration produced by chlorine, rust, insecticides , detergents , sediment and other foreign objects . Satisfactory elimination of water-borne disease-carrying bacteria is accomplished by a hygienic filter bed which consists of silver ions absorbed on sponge silver metal which is deposited in a finely divided form on granular activated carbon of high surface area. An added benefit is that even though the coach is not used for some time, bacteria will not grow in the water distribution system. Each time the filtered water supply is used for drinking or cooking purposes, run the tap for a few seconds to clean out the line prior to using the water. This is particularly important if the water tap is not used on a daily basis. If the water supply has not been in use for extended periods, allow the water to flow for a minute or two before use.

Purifier Replacement

Depending upon the condition of the municipal water used, the filter media will normally process 75,000 gallons of water before the purifier will need to be replaced. For the majority of "Wanderers " this means there will be at least five years of useful life. The only practical way to determine when replacement is required is to go by the sense of taste. If a faint taste of chlorine is detected , it is time for a change. Even when there is a noticeable taste the bacteria stopping proper ties have not been compromised.

Water System Air Accumulator With Diaphragm

1989 WB 40 Manual Figure 5-5 Accumulator .png

An accumulator in the water system smooths out the water flow, eliminates water hammer and pulsations from the water pump. Having no diaphragm , the present accumulator can become water-logged , lose its effectiveness and require frequent re-pressurizing. The WX101 incorporates a butyl diaphragm with the air side (top) being pre-charged to 20 psi. If this is accidentally lost, the accumulator may be recharged to 20-25 psi through the Schrader valve on top.

Water Heater

The 10 gallon Marine Electric Water Heater has a "motor aid" heat exchanger to ensure a supply of hot water while in transit and upon arrival at your destination . Engine coolant circulates through this heat exchanger as shown in the chassis heater piping diagram in Section X. The electrical heater can be used whenever 120 volts ac is available . The heater switch, located in the bedroom closet , switched Off when heated water is not needed.

Dry Tank Switch-Water Heater

In order to preclude the possibility of water heater element burn-out , a dry tank sensor circuit is provided . This circuit consists of a sensor in the outlet of the hot water tank which sends a signal through a printed circuit board to energize a relay whenever the tank is not full. When the 12 volt coil of the relay is energized , it breaks the 120 volt ac circuit to the heater element.

Outside Faucet

An outside faucet is provided in the L.P.G. tank compartment so it is not necessary to enter coach to wash hands , etc. The low point drain valve behind the bathroom toilet must be open to supply water to this faucet. To gain access open bottom hinged door and lift hinged floor . While traveling in freezing weather, this faucet should be left open and the low point drain valve closed.

Drainage System

A diagram of the drainage system is provided in Section X. Separate holding tanks for gray water and body waste are located beneath the coach mid-section . The gray water holding tank is the receiver for the water from the kitchen sink and the shower; the waste holding tank stores toilet wastes and waste water from the bathroom lavatory. Each holding tank has a separate drain valve, dumping gray water and wastes through a common single discharge connection. Separate vents from each holding tank extend through the roof of the coach. The right (curb) side holding tank serves as the body waste tank and the one on the left (road) side functions as the gray water tank.

Draining the Holding Tanks

The waste holding tank is drained first, then the gray water tank. Drain the holding tanks as follows:

It is advisable to drive your unit for a short distance to agitate the contents of the holding tank before dumping.

  1. Check that both drain valves are in a closed position before removing drain cap . Note that the valve handle s are turned clockwise to lock the valve.
  2. Remove the safety cap from the single discharge connection by turning the locking ring in a counter-clockwise direction and connect the 3- inch sewer hose coupling to the end of the valve. Tighten locking ring securely , in a clockwise direction. The sewer hose is stored within a tube accessible through a compartment door located above the drain cap , figure 5-6 . Place the discharge end of the hose into the sewer conne ction and check that all connections are secure to prevent accidental spillage.
  3. Open the drain valves, by turning the handle to the left (counterclockwise) to unlock, then pull the handle straight outward.
  4. After contents are emptied, flush out holding tank to dislodge remaining solids. Note To clean the holding tank, add a detergent solution into the tank after it is emptied. The agitating action from vehicle movement will clean the tank.
  5. Close drain valves by pushing handle inward and turning to the right (clockwise) into the locked position.
  6. Disconnect and wash out drain hose, replace hose and replace safety cap securely.

Dupree Power Valves

Visit the Dupree Power Valve page to find more information regarding operation, maintenance, parts list, and other key information.

Tank Level Detectors

Each of the holding tanks and the potable water supply tank has a level detector which provides an electrical input to the Systems Monitor panel on the dinette side wall. Activate the display to read the level of liquid remaining in each tank by pressing the appropriate pushbutton switch.


To prevent freezing of water supply lines, they are wrapped with heat tapes that operate automatically when the temperature drops below 38 degrees F. The heat tapes are connected to the ac outlets in the rear of the refrigerator compartment and behind the kitchen sink base.

If you are planning on storing your motorhome in an unheated area during cold weather, it will be necessary to winterize the water system to prevent damage from freezing conditions. Winterizing procedures are covered in the following paragraphs.

Draining and Winterizing the Fresh Water Supply System

The following procedures show the use of the various drain valves, controls and pressurized air system to remove the water from the plumbing and appliances in the fresh water supply system. Refer to figures 5-2 through 5-7 for the location of controls and valves.

1989 WB40 Figure 5-7 Lavatory Sink Plumbing.png
  1. Open the main circuit breaker box and set the Water Heater and Instant Hot circuit breakers Off.
  2. Turn on Water Pump switch and open all faucets (galley sink, lavatory , shower , outside hose connection and toilet water valve - after depressing pedal insert block to maintain position) . Note that the outside water hose connection should always be left open when freezing temperatures are expected. Also, remove thumbscrew from bottom of toilet valve, and drain plug at bottom of Instant Hot. If equipped with Ice-Maker refer to Draining the Ice-Maker below.
  3. Open the low-point drain valves located beneath the lavatory sink, figure 5-7, and the lavatory.
  4. Turn the Water Tank Drain control to Open , and the WATER HEATER switch to Drain. Both controls are located on a panel in the bed base cabinet or vanity , figure 5-2.
  5. Allow water to drain completely before proceeding to the next step.
  6. Move the Water Heater switch to Fill.
  7. Set Water Purge Air Pressure switch , figure 5-2, to On to activate the solenoid which applies air pressure to the input water line to purge the water system. Note that it may be necessary to start the engine to build up air pressure.
  8. When only air remains in the lines, close both low-point drain valves and all faucets . Replace drain screw/plug in toilet valve and Instant Hot. Operate the Instant Hot water heater valve to clear the heat exchanger of remaining water. Note When reactivating system make sure Instant Hot is full of water before switching on.
  9. Turn Water Purge Air Pressure control to Off, set Water Pump switch off, and shut down engine.
  10. Disconnect both hoses from the water pump to prevent residual water from backing up into the pump.
  11. Open all faucets and both low-point drain valves (toilet valve to remain open ).
  12. Drain the holding tanks and add RV antifreeze (several quarts) to each tank through the toilet (into the sewage tank) , and through the galley sink (gray water tank).
  13. At this point, the only water remaining in the system is contained in the U-traps (P traps) beneath the lavatory and shower drain. To prevent this water from freezing and damaging the traps , pour one pint of RV system anti-freeze into each trap.

Draining the Ice-Maker

If your motorhome is equipped with an ice-maker it will also have to be drained so that no water remains in the line or icemaking mechanism.

  1. Remove the cover from the bottom compartment and turn the switch Off
  2. Disconnect the water line from the solenoid valve fitting. 5-6
  3. This line must be blown free of water , and can best be done during step 7 above. Do not reconnect the water line at this time.
  4. Turn On the ice-maker and allow it to operate until all remaining water is drained (approximately one hour). Remove any water remaining in the icemaker mold , drip tray, or cube compartment.
  5. Turn ice-mak er Off, reconnect water line, and leave door slightly ajar to prevent interior humidity build-up from corroding the ice-making mechanism micro-switches.

Liquefied Petroleum Gas (LPG) Systems

The coach is equipped with a permanently mounted 43.5 gallon (148 pounds of fuel-net) LP gas tank which is the energy source for the range, three gas furnaces and alternate source for the refrigerator. A piping diagram of the LPG system is shown in Section X.

LPG Tank and Controls

The LPG supply tank is located in a curbside compartment as shown in figure 6-1 . LPG system controls include a main gas service valve, two stage pressure regulator , filler connection with Auto Stop {80%) fill valve, 20% vapor (stop filling when liquid appears) valve, and the pressure relief valve. Down stream of the pressure regulator is a solenoid operated shut off valve.

1989 WB40 Manual Figure 6-1 LPG Tank Compartment.png

Warning When coach is to be stored in a confined area, turn off the LPG at the main tank shutoff valve (figure 6-1 ).

A flexible hose from the two stage pressure regulator connects to tubing which carries the LP gas to the electrical solenoid shutoff valve, and manifold to individual appliances. The solenoid valve is actuated by either a high pressure condition (caused by a defective regulator), or by the remote LP leak detector , located below the refrigerator door. Tank level can be monitored at the Systems Monitor panel. To read the digital display , press the Propane Tank button .

Caution Be sure to shut off all gas appliances before filling the LPG tank. Check gas lines and fittings periodically for tightness and leakage.

Fuel Requirements

Liquefied petroleum gas is a material composed of various hydrocarbons such as propane, butane, or a mixture thereof. In its gaseous form (vaporized) it is colorless and has a garlic-scented additive to ensure detection. In addition to being highly inflammable, it is also dangerous to inhale. For ease of transportation and storage, LPG is compressed into a liquid state and stored, in this form, within the LPG tank. As fuel is used, vapor passes from the top of the tank into the two stage pressure regulator and to the various gas appliances.

Appliances will not function if the LP gas does not vaporize. Butane will not vaporize below 32 degrees F. (the freezing point of water), but propane will continue to vaporize down to 44 degrees below zero. Propane has become the main type of LP gas used in RV's in recent years. Your LP supplier will have the correct type or blend for your locale. If your travels will take you into an area where climate differs, ask your LP dealer for his recommendations. The names of LP suppliers can be found in the yellow pages of your telephone directory under "Gas-Liquefied Petroleum - Bottled & Bulk". Many campgrounds now have LP gas fill facilities, as do some service stations.

Prevent condensation and possible regulator or line freeze-ups , when filling the tank, by requesting the dealer to add a small amount of Methyl Alcohol to the fill-up . A common mixture is one ounce of Methyl Alcohol to each 20 pounds of LPG.

Filling the LP Gas Tank

When the tank is being filled, the Service valve must be Closed and the 80% liquid level valve (20% vapor valve) must be Open. The 80% Auto stop fill valve may close before liquid appears at the 80% liquid level valve, but if liquid does appear, stop filling immediately ; the tank is filled to its LP capacity. Close the liquid level valve. Do not use a wrench to tighten this or the Service valve; they are designed to be closed leak-tight by hand. If you cannot hand-tighten properly , the valve probably needs repair or replacement.

LP Gas and Vapor Detectors

The Gas/Smoke alarm, on the monitor panel , has sensors at various locations through the coach and sounds an alarm if the safe amount of LP gas or carbon monoxide in air is exceeded . The LP gas leakage detector below the refrigerator door monitors the area near the refrigerator and the range, sounding an alarm and actuating the LP gas solenoid shut-off valve if a leak is sensed.

Regulator Pressure

The two stage pressure regulator regulates the pressure of the LPG supplied to the appliances. The regulator functions automatically and is factory-preset to provide the correct line pressure. Do Not attempt to tamper with or reset the regulator! Even a small variation above the normal gas line pressure can be sufficient to create a dangerous situation and cause possible damage to individual appliance components. If there is any doubt about the regulator setting it can be checked by your Wanderlodge ® dealer or LPG supplier. The correct setting is 11-14 inch water column.


To operate any LPG appliance , the main gas (Service) valve , figure 6-1, must be Open. At each furn ace there is a shut-off valve that must be opened prior to use. When first used , or after a refill, there may be some air in the gas lines which will escape when you open a range burner or similar LP gas valve . The air may extinguish your match or igniter the first time or two , before you get ignition. Remember , too , that when you close the tank 's Service Valve some of the gas will remain in the lines . To completely bleed the lines of gas, Close the tank 's Service valve and light a range burner to use up the excess . When the flame burns out, turn the range burner Off.

Checking For Leaks

Periodically check the LPG system for possible leakage. Do not wait for an alarm condition to occur before correcting a leak! Although the entire system and associated appliances undergo extensive factory testing for leakage , road shocks and heavy vibrations may loosen or damage piping or fittings. Leaks will usually become noticeable by the characteristic odor of the garlic-scented gas additive. To check, turn off all burners and pilot lights. Open all doors and windows. Open LPG tank service valve and use an ammonia & chlorine free soap-bubble solution on all connections. Any bubbles are evidence of leakage.

LPG Consumption

Most gas appliances are intermittently operated. However, operation during cold weather conditions does cause a heavy use of the gas furnaces. Extensive oven usage also consumes a great deal of fuel. The amount of LPG consumption depends on the total use and manner of use of these appliances. Note that each gallon (4 ¼)lbs of LPG fuel produces approximately 91,500 BTU's of heat energy. The LPG tank used in your coach will furnish over 3 million BTU's. For your guidance in estimating your anticipated fuel consumption, the following is a listing of typical appliance consumption ratings when the appliance is operated for one hour:

Refrigerator 1,500 BTU's
Cooktop Burners 5,200 BTU's
Furnaces (3) 16,000 BTU's Each

LPG System Warnings

Warning LP gas containers shall not be placed or stored inside the vehicle. LP gas containers are equipped with safety devices which relieve excessive pressure by discharg ing gas to the atmosphere.

Warning It is not safe to use cooking appliances for comfort heating. Cooking appliances need fresh air for safe operation. Before operation:

  1. Open overhead vent or turn on exhaust fan.
  2. Open Window. This warning label has been located in the cooking area to remind you to provide an adequate supply of fresh air for combustion. Unlike homes, the amount of oxygen supply is limited due to the size of the recreational vehicle , and proper ventilation when using the cooking appliance(s) will avoid dangers of asphyxiation. It is especially important that cooking appliances not be used for comfort heating as the danger of asphyxiation is greater when the appliance is used for long periods of time. A warning label has been located near the LP gas container. This label reads. Do not fill container(s) to more than 80 percent of capacity. Overfilling the LP gas container can result in uncontrolled gas flow which can cause fire or explosion. A properly filled container will contain approx - imately 80 percent of its volume as liquid LP gas.

Warning Portable fuel-burning equipment, including wood and charcoal grills and stoves, shall not be used inside the recreational vehicle. The use of this equipment inside the recreational vehicle may cause fires or asphyxiation.

Warning Do not bring or store LP gas containers, gasoline or other flammable liquids inside the vehicle because a fire or explosion may result. The following label has been placed in the vehicle near the range area: If You Smell Gas:

  1. Extinguish any open flames , pilot lights and all smoking materials.
  2. Do not touch electrical switches.
  3. Shut off the gas supply at the tank valve(s) or gas supply connection.
  4. Open doors and other ventilat ing openings.
  5. Leave the area until odor clears
  6. Have the gas system checked and leakage source corrected before using again.

LP gas regulators must always be installed with the diaphragm vent facing downward. This will minimize any chances of vent blockage which could result in excessive gas pressure causing fire or explosion.

Warning Never check for leaks with an open flame. Do not check copper plumbing lines for leaks using ammoniated or chlorinated household-type detergents. These can cause cracks to form on the line and brass fittings. If the leak cannot be located, take the unit to your Wanderlodge -ID dealer or LPG supplier .

Regulator Replacement - (USER UPDATE: not from original manual)

Photo A: Green arrows show area between stage 1 and stage 2 that was leaking.
Photo B: Two stage LPG replacement regulator for a 1989 WB 40.

In 2019, we noticed a strong gas smell outside our 1989 WB 40 near the LP bay. Luckily, I was able to quickly locate the leak with some soapy water in a spray bottle. The leak was coming from a rubber gasket between first and second stage of the regulator (See Picture A). The regulators that Blue Bird originally installed are obsolete, so I replaced mine with a FISHER R232A-BBFXA 1/4 INLET 1/2 OUTLET (see picture B) that I found on eBay. Keep in mind that the life span of the diaphram in these regulators is around 20 years on the high pressure side, so if your coach is getting up there in age, you'll want to have a spare regulator onboard.

Make sure your replacement regulator is a TWO Stage that is able to handle tank pressure, since it can be as high as 235 PSI on a hot day traveling down the road.

The second stage regulator is made to have a high pressure regulator installed before it and the correct output of the second stage is 11-14 inch water column (~0.4 PSI). Initially I was confused, since all the regulators look very similar to each other. Always check the tag on the regulator that you are going to install for proper information. In my case, the trailing letters FXA were important because they indicated the direction of the vent. By code, vents are supposed to be pointing down when the regulator is installed.

Air Brake Systems


Your motorhome is equipped with dual service air brake systems for front, rear and tag axle brakes , with integral fail/safe operation; and manual/automatic rear spring (parking) brakes. As shown in the air brakes system diagram in Section X, the service brakes are completely independent systems, each including a reservoir and separate distribution lines and valves. A separate reservoir is also supplied for the rear spring brakes , which function independently of the service brakes. All three reservoirs are pressurized from a single compressor. Both service brake systems are brought into operation each time the brake treadle is depressed to slow or stop the coach. Reservoir pressure for each service brake system is monitored by a respective pressure gauge on the front panel ; system failure(s) are indicated by low pressure readings , illumination of the Low Air failure lamp and sounding of buzzer (item 10, figure 2-3).


When the coach is parked, and the engine off, the rear spring brakes will normally be set by operating the parking brake. The spring brakes cannot be fully released until the air pressure is above 65 psi. These brakes are in the released position when the control is pushed in. In the event that there is a loss of air pressure , the spring brakes will set automatically , at the brake-applied position, and will not release until the air reserve has again built up to required value. Consequently , there will be a normal delay, after the coach is first started , before the compressor builds up sufficient pressure in the three reservoir tanks , before the brakes can be released and the coach driven. When the brake treadle is depressed , to slow or stop the coach, reservoir air is applied simultaneously to both front and rear service brakes to effect the braking action. The spring brakes are held in a released position by the air pressure supplied from the associated reservoir tank.

Caution Do not attempt to drive the coach until system pressure is above 90 psi.

Brake Failures

To compensate for normal lining wear, each brake system is individually self-adjusting. Brake system failures are protected against by a combination of fail/safe features. Each service braking system , front and rear, has a backup capability in the form of the rear spring brakes in the event of partial or total system failures. If the front brakes fail , operating the brake treadle activates both the rear service brakes and the rear spring brakes, providing sufficient braking action to effectively stop the coach. Under these conditions , the spring brakes do not lock in, as in a normal released position, but instead their application is "modulated " in the same manner as the service brakes, thereby providing a normal braking "feel". If a failure occurs in the rear, the front service brakes and rear spring brakes provide braking action. In the unlikely event of a failure where both service braking systems are disabled , the rear spring brakes will apply automatically and bring the vehicle to a stop. As a safety factor, the coach should not be moved until any type of brake failures are corrected.

Note: With the front brake system service reservoir fully charged, enough air pressure is available to provide for four full releases of the rear spring brakes. This will allow the coach to be brought to a safe position until repairs can be accomplished.

Additional Air-Operated Equipment

Besides providing the compressed air supply for the coach braking systems , the compressor also provides the air supply for the entry step, side-slide mechanism on driver's and co-pilot's seats, front air vents , stepwell cover plate, tag axle and air suspension system (air bags) - all via separately controlled solenoid switches operated from the dash , or at other locations throughout the coach. (This compressed air source is furnished from the front right side reservoir.) A compressed air outlet fitting and air gun is contained in the center storage compartment on the left side of the coach , convenient for blowing out the water system, inflating tires, and so on. A Schrader valve (air connection} is available in the engine compartment to allow the air system to be pressurized from a "shop" source without the necessity of starting the engine.

Compressed Air System Air Dryer

The air dryer unit collects and removes moisture and contaminants from the compressor air output before the air reaches the reservoirs . This unit is different from a reservoir drain or an after-cooler in that it provides dry air for the brake system by eliminating the possible accumulation of condensate in the system reservoirs. Note that each reservoir also has a drain cock on the bottom for draining accumulated moisture. This assure s a long maintenance-free life for air brake system components due to the removal of system contaminants. The air dryer is located between the compressor discharge (output) line and the compressed air reservoirs . A safety valve mounted in the air dryer housing assembly protects against excessive pressure buildup. The desiccant cartridge and pleated paper oil filters are easily removable and replaceable as a complete serviceable unit. The desiccant "beads" which provide the drying action have a large capacity for absorption due to their combined surface area. In addition, an internal thermostatically-controlled heating element prevents freeze-ups on the purge drain valve when the unit is used during sub-freezing temperatures. Purging of the dryer is automatic , exhausting combined oil and water residue to the atmosphere. At the same time that the contaminants are purged the reverse air flow across the desiccant material removes the accumulated moisture and reactivates the desiccant. Cartridge replacement should be accomplished at 3 years or 300,000 miles; sooner , if the cartridge has become contaminated .

Maintenance Data

This section provides general information for use in performing scheduled services as well as preventive and routine maintenance on your Wanderlodge.

Caution Cooling fan is driven by hydraulic pressure. Flow is controlled electrically by a thermostat which senses engine coolant temperature. Any time the engine is running the fan may engage and start without warning. Also on hydraulically driven fans, the fan may start and run for several seconds when the engine is shut off or if electrical power is interrupted. Shut off engine and wait for fan to stop before servicing. When inspecting or servicing engine or other components in engine compartment the engine control switch must be placed in OFF or REAR position to prevent starting of the engine from the driver's area.

Engine and Chassis Specifications

Description Spec.


Engine Detroit Diesel 8v92TAC 475HP, 450HP (Calif.)
Transmission Allison HTB741/4 Speed
Chassis GVWR 45,200 lb. max
Front Axle 14,600 lb
Rear Axle 23,000 lb.
Tag Axle 10,000 lb.
Wheelbase 247"
Air Brake System
Front Axle Self-adjusting 16.5" x 5" brakes
Rear & Tag Axles Self-adjusting 16.5" x 7" brakes
Air Reservoirs Four Air Tanks 6,520 cu. in.
Retarder Akkusib Transmission Brake/Retarder
Wheels & Tires (8) Aluminum rim, 11R22.5 16 PR tubeless steel-belted radial
Tire Inflation <See information plate inside generator battery door>
Axle Ratio 3.42:1
Dayco Auto Belt Gates Auto Belt Napa Auto Belt Auto Cross Reference Belt
Lower Alternator 15290 7290 25-7290 15290
Upper Altenator 15425 7425 25-7425 15425
Air Conditioner 17360 9360 25-9360 17360
Alternator WL P/N 3740115- Dayco 42-1017 (2)
A/C Compressor (Set) WL P/N 0921908 (1)
Leveling Jacks (Hydraulic)
Front (each) 32,000 lb. rating
Rear (each) 48,000 lb. rating
Trailer Hitch Ball Nut Torque 200 ft.-lb.

Engine /Chassis Capacities

Diesel Fuel Tank 300 gallons
Fuel Additive US Borax Biobor JF Fuel Additive - use 2.8 fl. oz. per 100 gallons
Lubrication System Crankcase Capacity

Dry . . . . . . . . . . 6V92-2 3 qts.; 8V92 25-qts.

Refill . . . . . . . . . 6V92-21 qts.; 8V92 23-qts.

Cooling System Specification: Low Silicate Ethylene Glycol Base Antifreeze

(Formulation standard GM 6038-M)

Capacity: ~117 qts.-8V92 with cockpit and living area heaters

Engine Oil Specifications API: CC/SE, CC/SF, CD/SC, CD/SE, or CD/SF

30 degrees to 100 degrees F: SAE 40 , SAE 30

Below 30 degrees F: SAE 40, SAE 30, or 15W-40

Frequency of oil change Every Year or 20,000 miles
Oil Filter WL P/N 3734209 (AC PF911 or FLEETGUARD LF 3333)

Change filter every oil change

Power Steering and

Hydraulic Engine Cooling Fan

Specification: 10W-30 Motor Oil

Capacity: 20 quarts

Filter Element: WL P/N 2122026 (Parker 925835)

Reservoir Element WL P/N 2137065 (3 req'd)
Frequency of Filter Change Every Oil Change
Leveling Jacks Spec: Dexron II

Capacity: 20 quarts

Transmission Spec: Dexron, Dexron II

Capacity: 19 quarts MTB 654 and 33 quarts HTB 748 including filter and cooler

Gradeability (Hill Climbing)



55,200 GVWR +

Max Towing Wt %

Speed MPH
1st 17.7 14.4 15.3
2nd 7.5 6.1 35.8
3rd 4.4 3.5 52.4
4th 1.9 1.4 73.1

Generator Capacities and Specifications

Electrical Rating 12.5KW at 120 Vac
Fuel Supply Diesel, separate pickup in main tank
Fuel Filter Racor element WL P/N 3737673
Cooling System Water-cooled 16 quarts
Crankcase Capacity 6.1 quarts
Oil Filter WL PIN 3831328
Oil Specifications for Generator API Classification . . . . . . . . . . . . . . . . . . . CD

Below 50°F. . . . . . . . . . . . . . SAE 1 0W-20W

50°-68 °F. . . . . . . . . . . . . . . . . . . . 20W or 20

68°-95 °F. . . . . . . . . . . . . . . . . . . . . 30 or 40

Over 95°F. . . . . . . . . . . . . . . . . . . . . . . . . 50

Battery 12 volts 90AH
Air Filter Element WL P/N 3779055 (Donaldson P10-2745 or P12-3065 )

Motorhome Capacities and Specifications

Potable Water Tanks* 116 gallons
Holding Tank, Gray Water 100 gallons
Holding Tank, Waste 100 gallons
LPG Tank 148 lbs.-net (43.5 gallons)
Water Pump 3.5 GPM
Water Heater 10 gallons
Batteries Six 6-volt batteries , series-parallel

connected to supply 12v at 660AH

Battery Chargers 30-80 amperes output each
Air Conditioners** Automotive: 18,000 BTU

Roof (3): 13,500 BTU ea.

Hot Water Circulating Heaters Living Room (3): 50,000 BTU ea.

Bathroom: 15,000 BTU

Driver's Area: 90,000 BTU

Gas/Hot Air Heaters *** Living Room: 32,000 BTU

Bathroom: 15,000BTU

Electric Heaters 120 volt (4) 1500 watts ea.

* 83 Gallons with cross-bed option (96 w/Queen)

**NEMA Rating

***SBBMA Rating

Maintenance Schedule Summary

Item Frequency Type of Service Specification
Transmission At normal oil change intervals Replace transmission tilter WL P/N 0998542 ,

(AC PF-897) MTB654 WL P/N 3831302 ,

(AC HD-223) HTB 741

in cooler return line
25,000 miles , or 12 months , whichever occurs first Replace transmission fluid (Dexron or Dexron II)

Replace transmission internal tilter WL PIN 3827540 (Kit DOA P/N 23019201) with MTB654 only

See Section X Diagram,

Lubrication Guide for service of other

Engine/Chassis components

Batteries Every 500 to 1,000 miles Replenish cells with distilled water to %-inch above plates. Coat Battery terminals with lubricant
Air Cleaner 10,000 to 15,000 miles Replace when air cleaner indicator shows red after run at 2,000 R.P.M.

Sometimes will show red after high power run (normal): Reset WL P/N 3734191 , (Donaldson P12-9396)

Fuel Filters 10,000 to 15,000 miles Replace as required Secondary Filter WL P/N 3734175 (Fleetrite FFR8206)

Racor Filter and Water Separator Change when vacuum (RACOR) gauge goes into red.

Element WL P/N 3831310 (Racor 2020SM) Gasket (large) WL P/N 3747359(Racor11007)

Gasket (T-handle) WL P/N 3747342(Racor11350)

Experience may indicate interval revisions.
Air Brake System
Reservoir Tanks Daily or depending on usage (not necessary with air dryer) Drain each reservoir tank of moisture by opening petcock at bottom of tank
Air Compressor Air Dryer 23,000 miles , or every 3 months, or every 900 hours.

Refer to Bendix Air Dryer Manual.

Check/replace air dryer cartridge WL P/N 2107753 (Bendix 287313)
Air Suspension System 1,000 - 3,000 miles, or every month Check air springs for even inflation

Check for tightness of nuts , bolts , air connections

Check shock absorbers for oil leakage , worn bushings - No lubrication is required

12-Volt Lighting Equipment and Fuses, Current Usage

Item Specification


Automotive Lighting Marker/Clearance / Identification , bulb # 1895 (16)/4.5
Stoplights , bulb upper & lower # 1157 (4)/8.4
Parking Lights bulb# 1157 & # 194 (front inside) w/tag (9)/4.5
Turn Signal Lights bulb# 1157 (2)/4.2
Cornering Lights , bulb# 1156

Side Turn Lights , 2/side , 2 # 1895 bulbs/light Indicator Light WL PIN 2271955

Relay-rear lights , WL P/N 1077718 , located at upper front load center

14A. ea
Hazard warning (6)/12.6
Tag Light, bulb #168 (1 )/.35
Headlights and Taillights (with park & tag) G.E. Halogen Sealed Beam Units 1A1 &2A1

Hi-beam operation

Low-beam operation

(13)/13. 7

(11 )/9.9

Driving Lights , bulb WLP /N2143477 (2)/15.6
Instrument Panel- Electroluminescent (inverters) (3)/1.0
Instrument PanelGauges , bulb # 53 (14)/1.7
Spot Lights , bulb W/L PIN 2103760 (2)/13.6
Stepwell outside , bulb # 53 (1 )/.12
Stepwell inside, bulb # 67 (1 )/.55
Landing Lights , bulb assy. W/L PIN 2261626 (4)/27.2
Backup Lights , bulb # 1156 (2)/3.8
Rear Parking Halogen (2)/13.4
Engine Compartment Lights bulb # 67 (2)/13.4
Luggage Compartment Lights bulb # 1416 BA. ea.
Porch light , bulb # F8T5/CW (2)/2.2
Interior Lighting

Reading Spots , bulb # 1383

Front Living, Flush . bulb# F15T8/CW

Aisle , (night) bulb #53

Bathroom Mirror bulb # F8T5/CW

Bathroom , Flush, bulb# F15T8/CW

Shower , bulb # 1141

Dinette , Flush, bulb # F15T8/CW

Kitchen, Flush, bulb# F15T8/CW

Bedroom Island bed, bulbs F72T12/CW & F96T1 2/CW

Ceiling , Flush, bulb # F15T8/CW

Vent Fans, bulb # 912 (i1 1.0A.

Refrigerator W/L P/N 3783917 Dometic 200-7290 -00/6

(15)/1.54 ea.











(1 )/.8

Windshield Wipers
Water Pump
Blower Motors

Front Heater (Hi/Lo) Right

Defroster (Hi/Lo)

Foot Warmer (Hi/Lo) Left

Chassis Heater (Hi/Lo)

LPG Furnace

Portable Fan

Duct Booster

Ceiling Vent (round)

Vent Fan (square)




(3)/9.0/4.5 ea.


(1)/1 .0




Stereo System (1 )/15
Motor Generator

Changing Wheels/Tires

The wheel/tire assemblies used on your motorhome are heavy-duty truck-type. They are heavy and may be difficult to handle. If at all possible , changes should be accomplished by a service station equipped to handle truck equipment . However , if a situation arises where no service facilities are available , the following procedures may be used .

1989 WB40 - Figure 8-1.png

Front Axle Wheels

  1. Drive motorhome out of traffic lane onto a level surface capable of supporting jack.
  2. Turn on hazard flasher and apply parking brakes before leaving coach.
  3. Turn off ignition and set transmission selector to Neutral (N) position .
  4. Remove white plastic wheel saver , jack , lug wrench and handles from road side storage compartment.
  5. Place wheel chocks against front & rear of tires on opposite side.
  6. Place jack under axle and raise slightly until securely in place. See figure 8-1 for location of typical jacking point.
  7. Remove spare wheel assembly from mounting and place on ground near work area.
  8. Pull off lug nut covers.
  9. Install wheel saver. Note It is recommended that the wheel saver be used when loosening or torquing lug nuts.
  10. Loosen lug nuts slightly, then jack up coach until tire is clear of ground. Caution Severe injury or death may result. DO NOT use the leveling system for changing tires or working under the vehicle. Keep the rear wheels in firm contact with the ground with the parking brake set. With the leveling jacks extended, there is a possibility the vehicle may move either toward the front or the rear. Note Lug nuts on right side of coach are righthand threaded (turn counterclockwise to loosen, clockwise to tighten); lug nuts on driver's side of coach are lefthand threaded (turn clockwise to loosen, counterclockwise to tighten).
  11. Remove lug nuts and wheel assembly.
  12. 1989 WB 40 Figure 8-2 .png
    Install spare and replace lug nuts . Tighten progressively in the sequence shown in figure 8-2 starting with # 1 and proceeding to # 10. Final torque will be 450 to 500 foot-pounds.
  13. Snap front hub cover into front wheel opening after front lug nuts have been properly torqued.
  14. Place lug nut covers on all lug nuts. Make certain that these nut covers fit snugly. This is accomplished by squeezing the dimpled sides together before installing.
  15. Lower coach to ground and remove jack and handle.
  16. Replace wheel saver , lug wrench , jack and handles in storage compartment and tie down to prevent road noise . Return damaged wheel /tire assembly to holder and have it repaired as soon as possible.
  17. Remove and stow wheel chocks.
  18. Turn off hazard flasher before returning to traffic.

Drive Axle Dual Wheels

  1. Repeat steps 1 through 10, front axle wheels .
  2. Loosen inner lug nuts (studs with square heads) , if inner wheel is to be replaced .
  3. Remove outer lug nuts from the (5) studs which have lock rings and slide hub cover over remaining lug nuts .
  4. Remove the (5) remaining lug nuts and wheel.
  5. Remove inner lug nuts and inner wheel , if inner wheel is to be replaced .
  6. Install replacement wheel and inner lug nuts. Tighten progressively in the sequence shown in figure 8-2 starting with # 1 and proceeding to # 10. Final torque should be between 450 and 500 foot pounds .
  7. Install outer wheel (or replacement wheel) and lug nuts over inner lug nuts marked 1, 3, 7, 9 and 6. Torque nuts in the following sequence 1, 7, 6, 3 and 9 to between 45 and 500 foot pounds.
  8. Install hub cover over the (5) lug nuts holding wheel to hub. Place lock rings and lug nuts on remaining inner lug nuts 10, 5, 2, 4 and 8.
  9. Replace wheel saver.
  10. Torque nuts in the following sequence 10, 2, 8, 5 and 4 to between 450 and 500 foot pounds.
  11. Return to step 14 of Front Axle Wheels and continue .

Note When checking torque on dual wheels loosen all outside lug nuts. Check torque on inner lug nuts (studs with square heads) for torque value shown above then torque outer lug nuts to value shown above.

Tag Axle Wheels

  1. Repeat steps 1 through 10, front axle wheels.
  2. Remove lug nuts from the (5) studs which have lock rings and slide hub cover over remaining lug nuts.
  3. Remove the (5) remaining lug nuts and wheel.
  4. Install replacement wheel and lug nuts on studs marked 1, 3, 7, 9 and 6. Torque nuts in the following sequence 1, 7, 6, 3 and 9 to between 450 and 500 foot pound.
  5. Install hub cover over the (5) lug nuts holding wheel to hub. Place lock rings and lug nuts on remaining studs 10, 5, 2, 4 and 8.
  6. Replace wheel saver .
  7. Torque nuts in the following sequence 10, 2, 8, 5 and 4 to between 450 and 500 pounds.
  8. Return to step 14 of Front Axle Wheels and continue .

Caution Check lug nuts for tightness every 1,000 miles. Lug nuts should be torqued to 450 to 500 foot-pounds.

Battery Maintenance

Your motorhome is equipped with six 6-volt batteries, connected in a series-parallel arrangement to provide 12 volts for engine and motorhome use. This arrangement makes available 660 AH (20 hour rate). Batteries are located in the rear engine compartment on the curb side, as shown in figure 4-2. A separate 12-volt battery is contained in the road side front compartment and is used only to start the generator. All batteries are charged from either the engine alternator or battery chargers (when 120 volts ac is available). Note that the 12.5kw generator will supply 120 volt cJ.C to the battery chargers.

Periodic Battery Checks and Maintenance

Periodically check electrolyte level in the six 6 volt batteries. Odorless drinking water may be used to raise the level of the electrolyte. Before charging, batteries must be filled only sufficiently to cover the plates. After batteries are fully charged , the maximum should be no higher than it takes for the electrolyte to form a "fisheye" at the bottom of the fill well. The generator battery is sealed so it is not necessary to check the level of the electrolyte. Battery condition depends on battery usage and proper utilization of the battery chargers.

Caution Avoid sparking of any form in the vicinity of the batteries, especially while caps are off.

Caution Do not wear metal rings , watches or jewelry when working on or near the batteries, cables, solenoids , or chassis wiring. These can short out electrical wiring and cause injury

To make sure that the batteries are always ready for use, periodically check and charge as necessary . Check batteries at least every two weeks in freezing weather; at least every four weeks in warmer weather. A fully-charged battery will not freeze under normal circumstances , so it is imperative that the batteries remain charged during winter. A safe level of charge is a specif ic gravity reading of 1 .225 to 1 .280. Alway s use a battery hydrometer which has a temperature correction scale. It is advisable to have the coach shoreline connected to the 120 volt ac supply so that the batteries rema in fully charged. A dirty battery may eventually dissipate its charge through conductive surface contamination . Clean battery top surface with a damp cloth and dry thoroughly. Check that battery terminals and associated battery jumer terminals are tight and free of corrosion. To clean terminals, neutralize corrosive deposits with a solution of baking soda, rinse with clear water , and dry. Note that commercial type spray-on battery cleaners are available at automotive supply stores. Use as directed to keep the batteries clean. Spray-on cable and terminal protective coatings are also available, easy to use, and effective.

Replacement Battery Comparisons
Part Number BCI Group Type Manufacturer Volts Amp Hours

@ 20-hr

Capacity Mins

@ 25 Amps


L x W x H (inches)



Qty Needed

To Match Orig

SLIGC125 GC2 Flood Duracell 6 235 448 10.25 x 7.15 x 10.88 68 6
T-105 RE GC2H Flood Trojan 6 225 447 10.30 x 7.11 x 11.67 67 6
L16-AGM 903 AGM Trojan 6 370 817 11.66 x 6.94 x 16.41 114 4 - 6
SLI6V370S 903 Flood Duracell 6 370 11.75 x 7.00 x 16.50 113 4 - 6
GPL-L16T 903 AGM Lifeline 6 400 950 11.64 x 6.95 x 15.73 119 4 - 6
SRM-4D 4DM Flood Interstate Batteries 12 195 390 21.00 x 8.15 x 9.63 117 4 - 6
GPL-30HT 30 AGM Lifeline 12 150 315 13.46 x 6.77 x 11.95 96 5
GPL-27T 27 AGM Lifeline 12 100 186 12.03 x 6.60 x 9.47 62 6
T-145 GC2H Flood Trojan 6 260 530 10.30 x 7.13 x 11.91 72 6
SLIGC115 GC2 Flood Duracell 6 230 448 10.25 x 7.13 x 10.88 64 6

Exterior Care

Exterior paint finish life can be extended by periodic cleaning and waxing. This will preserve the paint and allow easier removal of dirt and road tars. Use touch-up paint for small areas to keep the coach finish in like-new condition.

Caution Avoid the use of strong detergents, such as those used in commercial truck washes. These detergents can discolor the aluminum trim on your coach .

Frequent washing of the coach is necessary to prevent corrosion in areas where heavy salt sprays are evident. A clear acrylic spray may be used, with care, to control corrosive effects of salt spray on metal surfaces.

Caution Avoid spraying water through the refrigerator vent door.

Interior Care

The interior can be kept in good condit ion with the use of approved cleaning agen ts for vinyl walls and ceilings , plastic fixtures , stainless stee l, formica and so on. Never use abrasive cleaning agents on interior of refrigerators , or on the lavatory, tub/shower , or toilet , as they can cause permanent scratches. Be sure that the cleaning agent will not damage the material. Note that some plastics are incompat ible with certain cleaners . Read the directions on the container before using . For the most part, the cleaners and polishes that would normally be used in your home are equally wellsuited for use in your motorhome .

Fluid Level Checks

1989 WB40 Manual - Figure 8-3.png

Crankcase Oil Level

The crankcase oil dipstick is shown in figure 8-3. The oil level must be checked only with the engine off. Maintain oil level at the proper fill line. If checking oil level immediately after engine has been operating , allow a few minutes for the oil to drain back into the crankcase before checking the oil level reading . The best time to check the oil is before getting underway because the engine is cool and the reading will be most accurate.

Power Steering and Hydraulic Cooling Fan Reservoir Fluid Level

Regularly check fluid level in the power steering and hydraulic cooling fan reservoir , figure 8-3 , at each fuel stop. Add only 1 OW-30 motor oil as necessary to maintain the correct dipstick reading , depending on fluid/engine temperature. (Note that dipstick is attached to the bolt on top of the reservoir). If the fluid is at normal operating temperature - about 150 degrees , and hot to touch - the dipstick should indicate 1 /2 to 3/4 full. If engine is cool, fluid level should read about 1 /2 full.

Caution The hydraulic fluid used in this unit is 1 OW-30 Motor Oil. Do not use conventional power steering fluid or the pump may be damaged.

Transmission Fluid Level

The transmission dipstick is shown in figure 8-3. Importance of Proper Oil Level Since the transmission oil cools , lubricates , and transmits power, it is important that the proper oil level be maintained at all times . If it is too low, the converter and clutches will not receive an adequate supply of oil. This can result in poor performance or transmission failure. If the level is too high, the oil will aerate , causing the transmission to overheat. Check the oil level at intervals specified in your vehicle service instructions, or more frequently , if operating conditions indicate.

Oil Check Procedure

Always clean around the end of the fill tube before removing the dipstick. Dirt or foreign matter must not be permitted to enter the oil system. It can cause valves to stick , cause undue wear of transmission parts , or clog passages. Check the oil level by one of the following procedures and report any abnormal oil level to your maintenance personnel. Check for abnormal oil level, milky appearance or any trace of coolant in the oil.

Hot Check
  1. Operate the transmission in a drive range until operating temperature (160-200 °F; 71-93°C) is reached. Note The oil must be hot to ensure an accurate check. The oil level rises as temperature increases .
  2. Shift through all drive ranges to fill the clutches and oil passages .
  3. Park the vehicle on a level spot , shift to neutral N and apply the parking brake. Let the engine run at idle speed.
  4. Wipe the dipstick clean and check the oil level. The safe operating level is any level within the Hot Run band on the dipstick.
  5. If not within this range, add or drain oil as necessary to bring the level to the middle of the Hot Run band.
Cold Check
  1. A cold check may be made when the sump temperature is 60-120 °F ( 15-40°C).
  2. Run the engine for at least one minute to clear the oil system of air.
  3. With the engine running at idle, wipe the dipstick clean and check the oil level. Any level within the Cold Run band is safe for operating the vehicle. If the level is at or below the bottom of the Cold Run band, add oil until it reaches the middle of the Cold Run band.
  4. Operate the vehicle and make a hot oil check when operating temperature is reached (160- 2000F; 71-93°C).

Racor Fuel Filter and Water Separator System

Filter/Separator Operation

1989 WB 40 Manual Figure 8-4.png

The three stages of the Racor filter/separator, figure 8-4, work in series to progressively clean the diesel fuel. Because virtually all water and larger particles of solid contamination are removed in the primary and secondary stages, the effective life of the fine micron replaceable element is 2-3 times longer than standard filters.

Primary Stage (Separation) - In the primary stage. liquid and solid contamination down to 30 microns are separated out by centrifugal action created by the turbine centrifuge. There are no moving parts in this highly efficient design. Because the contamination is heavier than the fuel it falls to the bottom of the clear bowl.

Secondary Stage (Coalescing) - This stage functions when minute particles of liquid contaminants (lighter than the fuel) remain in suspension and flow up with the fuel into the lower part of the filter/separator shell. Here the minute particles tend to bead on the inner wall of the shell and the bottom of the replaceable cartridge . As the beads accumulate , they become larger and heavier and will eventually fall to the bottom of the filter/ separator bowl.

Final Stage (Filtration) - In this stage the fuel enters the replaceable cartridge where the minute solids are removed.

In-Filter Fuel Heater - Internal automatic thermostats turn on the Racor in-filter fuel heater as the fuel temperature drops below 35°F. (1.7°C.) The in-filter fuel heater operates from the 12-volt battery source, supplying heat to the fuel filter just below the replaceable element. This critical placement provides increased fuel temperature as the fuel passes through the fine micron filtering element.

When the engine is not running and the temperature is below 35°F., the heater is operated by turning on the ignition switch for a maximum of 10 minutes prior to starting the engine. With the diesel fuel temperature above 35°F, _there is no waxing or icing of the filter element. The in-filter heater is primarily a cold starting aid. Note that the top two terminals imbedded in the glass filter bowl connect to the internal heater.

Water-In-Filter Alarm

The electronic water sensor alerts the operator when liquid contaminants filtered out of the system should be drained from the collector bowl, thereby maintaining maximum filter/separator efficiency. When water reaches a pre-determined level in the collector bowl, sensing probes activate the Water-In-Filter alarm circuit. The light illuminates, warning the operator to drain excessive water contamination collected in the bowl. Shut down engine before draining the bowl to avoid sucking air into the system. Note that the bottom two terminals imbedded in the bowl connect to the water sensors.


Filter Element - Routine maintenance of the Racor unit consists of periodic filter replacement and drainage of the moisture collected at the bottom of the bowl. (Engine is off durng maintenance.)

Filter Element Replacement - Replace the element as follows:

  1. Loosen handle and remove lid.
  2. Inspect lid gaskets and replace, if necessary .
  3. Remove filter element by grasping bale and lifting upward while rotating.
  4. Replace Racor element by positioning over center return tube and twisting downward into place.
  5. Top off by pouring clean diesel fuel into filter cylinder until full.
  6. Replace lid and hand-tighten handle.

Draining - Drain . bowl of accumulated moisture by opening petcock on bottom of bowl. Allow to flow until clean fuel appears.

Hydraulic Cooling Fan

The hydraulic cooling fan is thermostatically controlled to maintain engine temperature at approximately 195 degrees F. The oil reservoir for the fan, figure 8-3, is the large canister located between the fan assembly and the engine. Add oil as indicated by dipstick markings. Note that this reservoir also supplies the power steering system as well.

Note Use only engine oiI, SAE 10W-30

Oil and filters should be changed every 6 months or 25,000 miles, whichever comes first. Check condition of oil frequently when engine is hot. Run engine to 2100 R.P.M.; if red light (located on rear switch panel) comes on change oil and filters. One filter is in Parker unit at left rear axle. The three stacked elements must be replaced in the reservoir.

Leveling Jacks Reservoir

1989 WB 40 Manual Figure 8-5.png

The leveling jacks oil fill is located beneath the center entry step, as shown in figure 8-5. Lift up the hinged portion of the step and remove the screws attaching the square metal cover plate to gain access to the oil fill to check oil level.

Engine Air Filter Replacement

Check the air filter condition indicator , figure 8-6, on a regular basis. Sometimes the red band will show after a high power run. This is a normal condition. Reset to green band and run engine at a maximum of 2000 rpm. Filter should be replaced if red band is shown.

1989 WB 40 Manual Figure 8-6.png

Caution Do not operate the engine without the air filter in place or sensitive air metering systems may be damaged.

Engine Cooling System Refill

Use of low silicate ethylene glycol base antifreeze (formulation standard GM 6038-M) is recommended for summer or winter operation because of it's corrosion inhibition and lubrication properties. A 50-50 solution of antifreeze and water is preferred and it gives freeze protection to about 30°F below zero. Ultimate protection is attained at 68% antifreeze (about 92°F below zero): a higher concentration of antifreeze should never be used. The approximate (dry) cooling system capacities for 6V92 engine are:

Engine, Radiator, & Engine Hoses 18.5 gallons
Right front heater system 5 gallons
Rear coach heater system 4 gallons
Total 27.5 gallons (110 quarts)

... so the system would require 14 gallons of antifreeze for a 50% solution or 19 gallons for a 68% mixture. The 8V92 engine has approximately a 117 quart capacity so similar calculations would show anti-freeze required. Final solution should always be tested with a thermo-hydrometer or equivalently reliable testing device to determine actual protection. If it becomes necessary to completely re-fill the chassis coolant system, the following procedure must be followed (see figure 10-1 ). Pure antifreeze can be used initially until prescribed amount has been installed, and then water for final filling.

  1. Fill the engine, radiator, and engine hoses. Locate and close the manual gate valves separating the engine from the heater systems. Pressure and return gate valves (four) are located at the engine . In addition , a pressure valve for the front heater is electric solenoid operated . Close the front heater electric solenoid valve by placing the FRONT HEAT switch in the pilot's control area to the OFF position. Remove the radiator surge tank cap and fill to the top. Replace cap and run engine @ 1500 to 1800 RPM for one minute to purge air from the engine water jacket. Shut off engine; carefully remove the radiator surge tank cap; re-fill and replace the cap. Note Use extreme care at all times when removing the radiator surge tank cap as hot coolant under pressure can cause injury.
  2. Fill the front heater and rear heater systems . An air bleeder valve for the front heater is located behind the right side front bumper. Leave the return line gate valves closed and open the pressure line valves for front and coach (chassis) heaters . Place the FRONT HEAT selector to the HEAT position and the HEAT SELECTOR switch to the WINTER position. Press the AUX . PUMP switch to WINTER .

Using suitable containers to catch coolant , open the bleeder valve at front heater and remove right side hose from return TEE (above the chassis serial number end of the identification plate) and run the engine at 1,800 RPM until a steady flow of coolant passes through the front bleeder valve and open hose at rear. The radiator must be refilled often during this time as coolant from the engine will be filling the heater lines. When steady flow is attained from the bleeder valve , close it and open return line gate valve (bottom valve at left rear of engine) allowing coolant to flow back into the engine. When a steady flow comes from the open hose , shut off engine , reconnect hose , and open return gate valve (just below TEE) . Refill radiator using coolant caught from bleeding operation and add water as necessary . Restart engine and run at 1800 RPM for at least two minutes to complete system purge. Test heater blowers to make sure heaters are filled with hot coolant. Allow engine and radiator to coo l. Remove cap and fill radiator surge tank to the top of sight glass. Replace cap - refill procedure is completed .

Cooling System Additives

Automotive cooling systems are subject to various types of corrosion, rust, pitting and cavitation-erosion. These are common factors which prevent efficient cooling and contribute to engine overheating and higher maintenance costs resulting from replacement of hoses, fittings , filters and cracked heads . The manufacturer of the engine used in your motorhome recommends the use of Nalcool 2000 - a chemically buffered liquid additive which effectively neutralizes the formation of acids caused by dissolved exhaust gases , and inhibits the cool ing system against corrosion and scale formation . This additive is compatible with most commercial automotive anti-freeze solutions containing ethylene glycol ; however , its use is not recommended in coo ling systems using Dow Therm 209. When refilling the coolant system , add seven pints of Nalcool before topping off with anti-freeze solution. To ensure constant system protection, replenish Nalcool 2000 additive , periodically , in accordance with manufacturer's instructions.

Windshield Washers

Check reservoir fluid level periodically and use a prepared washer solution if possible. (Note that low reservoir levels are indicated by a dash monitor light.) During freezing weather, use a solution additive , or a solution specifically designed for cold weather usage. The washer reservoir is accessible through the front road side storage compartment.

Battery Jumper Terminals and Jump-Starting

For your convenience and safety when jumpstarting, terminal posts are provided in the curb side of the engine compartment (open rear door). Proper procedure for jump-starting is as follows:

  1. Turn off all main battery-operated accessories in both vehicles - lights, radio , etc.
  2. Connect one end of the positive-coded jumper cable to the positive (red) battery jump er terminal, and the opposite end of the cable to the positive ( + )terminal on the other battery.
  3. Connect one end of the negative-coded jumper cable to the negative ( - ) terminal on the other battery and the opposite end of the cable to the negative (black) battery jumper terminal.
  4. Once the engine of the disabled vehicle is started and brought up to idle , reverse the above procedure to remove the jumper cables. Always remove the jumper cable connected to the Wanderlodge ~ negative (black) battery jumper terminal first to prevent sparks at the other battery.

Caution Avoid sparks in the vicinity of a charging battery: the gas produced is explosive.


Keep the generator operating at peak efficiency by following a regular schedule for inspections and servicing , based on operating hours. Keep an accurate logbook record of maintenance, service and hours of operation , following regular schedules for normal operating conditions , and a more frequent service schedule for operation under dusty or dirty conditions. Check condition of crankcase oil and change air filter frequently until the proper service 'time periods can be determined based on you r usage. After the first 15 to 30 hours of operation , arrange to have the following performed at an authorized service center.

  • Drain and refill engine oil.
  • Replace engine oil filter.
  • Check external nuts and bolts for tightness.
  • Torque cylinder head nuts.
  • Check and adjust valve tappets .
  • Check for fuel or lubricating oil leaks.
  • Check radiator coolant level and inspect cooling system for leaks.
  • Check and adjust water pump belt tension
  • Check mounting tray bolts and vibro mounts for tightness.
  • Operate generator set a full or rated load , checking for proper output and governor operation.

Maintenance Schedules

1989 WB 40 Manual Figure 8-7.png

Use the generator maintenance schedule in table 8-7 as a guide for routine and periodic maintenance. Neglecting generator maintenance can result in failures or permanent generator damage. Refer to the generator service manual for detailed repair and maintenance.

Generator Maintenance Schedule (Table 8.8)
Frequency Service
Daily , or before each startup - Check oil level

- Check coolant level

- Clean radiator intake screen

Every 50 hours , or 3 months , whichever occurs first - Change lubrication oil

- Change oil filter

- Service air cleaner

- Check engine for oil, water , or fuel leakage

- Check belt tension

Every 200 hours , or 12 months, whichever occurs first - Check hoses and clamps

- Check and tighten electrical connections

- Check exhaust system for leakage

- Check and tighten mounting bolts

- Replace fuel filter element

- Check electrical system for frayed wires, corroded connections

Every 400 hours or 12 months - Contact authorized service center for tuneup to include:

- Injector inspection - Check and adjust valve tappets

- Clean sliprings and inspect brushes

- Check governor ope

Periodically, perform a complete visual inspection of the generator when operating at full load.

Caution The generator tray is electrically operated and extends outward with considerable force. To extend the tray, move around to the road side and operate the tray switch in the front compartment to out position. Be sure that there is sufficient clearance in front of the tray and that nobody is in the way! Use extreme caution when observing and operating generator with tray extended.


Check the condition of the generator battery periodically. See that battery connections are clean and secure. A light coating of nonconductive grease will prevent corrosion at terminals. Refer to Battery Maintenance procedures provided earlier in this section.

Air Cleaner

1989 WB 40 Manual Figure 8-8.png

Proper maintenance of the air cleaner, figure 8- 8, is extremely important. Allowing this vital element to become clogged with dirt restricts the flow of intake air into the engine. Operating with an over-rich fuel mixture caused by a poorly serviced or clogged air cleaner leads to formation of harmful carbon /sludge deposits. This air cleaner should be serviced every 100 hours or six months as follows:

  1. Loosen thumbscrew in Marman clamp while holding bowl.
  2. Remove bowl.
  3. Remove element thumbscrew and element.
  4. Wash bowl in non-flammable cleaner. Allow to air dry .
  5. Install new element & replace thumbscrew .
  6. Replace bowl and tighten Marman clamp thumbscrew. Be sure letters TOP are up.

If operating under extremely dusty conditions, use dry compressed air to blow out generator at frequ ent intervals . Do this with the generator set operating and direct the stream of compressed air in through the cooling louvres at the end of the generator.

Oil Filters

To ensure cleanliness of the lubricating oil. a sump strainer and a main full flow type of oil filter are used. The sump strainer consists of a gauze wire container which is fitted over the end of the lubricating oil pump suction pipe. All oil must pass through this strainer before it reaches the oil pump.

The main full flow type oil filter is mounted externally on the side of the cylinder block. All the oil passes through this filter after it leaves the pump, but before it reaches the bearings.

The full flow filter is a spinon cartridge in which the element is an integral part. Filter should be replaced at each oil change.

Replacing Oil Filter Cartridge

  1. Unscrew the cartridge from the adapter.
  2. Discard the old cartridge. Clean the filter adapter surface.
  3. Using clean engine lubricating oil, lightly oil the top seal of the new cartridge. Prime filter by partially filling with new oil.
  4. Screw the new cartridge until the seal just touches and then tighten by hand a further half of a turn. If the cartridge is overtightened, it may be difficult to remove later on.
  5. Since the filter cartridge will normally be changed at the same time as the engine lubricating oil, refill the sump with oil, run the engine and check for oil leaks. Recheck the oil level after running the engine and add oil as necessary.

By-Pass Valve

If the lubricating oil filter element becomes contaminated to the extent where the lubricating oil has difficulty in passing through the element , a pressure difference will build up between the inlet and outlet sides of the filter assembly. When this pressure exceeds 50 psi (approximately) , a ball valve opens in the filter headcasting and allows unfiltered oil to by-pass the filter element to protect the engine from oil starvation.

Oil Check

To be on the safe side, check oil in engine crankcase daily, or before each start, to ensure that the level is in the safe range between the upper and lower marks on the dipstick . Do not operate generator if level exceeds the upper mark, or is below the lower mark.

Caution Do not check oil level while engine is operating. Engine must be stopped to obtain a true reading, as well as for safety reasons!

Oil Change

Whenever possible , drain the oil while the engine is still warm. To drain , place a container below the unit, open the oil drain and allow sufficient time for the old oil to drain completely . After draining, close drain plug and tighten securely.

Cooling System

To avoid having the inconvenience of the generator shutting down due to overheating , or becoming damaged as a result of an overheat condition , be sure to keep the cooling air inlets to the compartment clean and unobstructed at all times. Cooling system capacity is about 16 quarts of liquid. When operating in climates subject to freezing temperatures , make sure that enough antifreeze solution is added to the coolant to prevent system freeze-up. (A drain petcock is provided on the underside of the radiator.) When draining the coolant , remove the radiator cap and open the block drain valve near the oil filler cap to prevent air pockets from forming and blocking water in passages in the block . Check coolant level frequently and add antifreeze mixture as needed to maintain surge tank 1 /2 full.

Table 8-9 Anti-Freeze Protection Chart
Anti-Freeze Protects to: Mixture Proportions (ethylene glycol)
+ 16 degrees F ( - 9 degrees C) 20%
+ 3 degrees F ( -16 degrees C) 30%
- 11 degrees F ( - 24 degrees C) 40%
- 31 degrees F ( - 35 degrees C) 50%

Generator Troubleshooting

Refer to the generator service manual for repair and maintenance data. Generator repairs should be accomplished by a qualified repair agency.

Generator Overloads

If the rated capacity of the generator is exceeded, the safeguard circuit breaker, located 0n the front of the controller box, will trip to protect the generator against damage . This condition could be caused by a short in the coach ac supply circuits, or by operating too many appliances simultaneously, resulting in an overload condition. If the safeguard circuit breaker trips , the generator will continue running but no ac output will be supplied. Before resetting the circuit breakers , turn off some of the coach appliances and lighting to reduce the load to within the operating limits of the generator. If this is done, and the generator breakers still trip, a short circuit is indicated. Turn off the generator , locate and correct the cause of the short circuit.

Generator Battery Charging

Generator battery charging current is supplied from either the engine alternator or the battery chargers (when ac power is available).

Storage Procedures

If the generator is to be out of service for a long period of time, perform the following procedures before placing the unit in storage:

  1. Drain oil from crankcase (while hot) then flush with clean lightweight oil. Refill crankcase with regular-weight oil after flushing
  2. Clean exterior surfaces of generator set then spread a light film of oil over any unpainted metallic surfaces which could corrode.


To ensure that your refrigerator will provide trouble-free operation , the following routine maintenance procedures should be performed at least once each year.

  1. Inspect all gas connections for leakage, using a solution of soapy water. Tighten, as necessary.
  2. See owners installation and operating instruction manual for periodic maintenance requirements.


No routine maintenance is required. If the bowl sealing blade fails to operate freely or does not close completely, clean foreign material out of sealing groove with stiff bristle brush. To clean the toilet, use a high-grade, non-abrasive cleaner. Do not use highly concentrated or high-acid household cleaners. They may damage seals and finish.

Microphor LF-220 Toilet

Please visit the Microphor LF-220 DC Toilet page for more information regarding maintenance, adjustments, parts list, and other detailed product information.

Water Pump

Under normal usage , the water pump should require no periodic maintenance other than ensur ing that the input water supply is properly filtered of particles that could damage the pump mechanism. Pump failures can generally be tied in to the plumbing system , or to electrical wiring. If the pump fails to operate properly, refer to the general trouble-shooting guide given in table 8-9. Note that detail pump repairs and overhaul should be performed by a qualified repair facility. A pumpgard filter is provided on the suction side of the water pump. This should be cleaned periodically.

Table 8-10 Water Pump Trouble Shooting Guide
Symptom Possible Cause Corrective Action
Pump operates but no water flows through faucet.
Low water level in tank Add water
Suction lines or filter clogged Clear water lines and clean filter
Kink in water suction hose Check water hose connections to tank and straighten or replace as necessary
Air leak in suction line Replace suction line
Pump cycles on and off when faucets are closed
Water leaking in plumbing Check for signs of leakage and tighten or replace fittings, pipes, etc.
Defective toilet flush valve Repair flush valve
Pump operates roughly and has excessive noise and vibration
Intake line is restricted, kink in suction hose or fittings too small Check hoses and straighten or replace as necessary
Loosened screws at pulleys and connecting rod Tighten screws
Deforemed or collapsed pulsation dampener in pump Replace dampener
Pump fails to start when faucet is opened
Clogged pressure piping Blow out water lines with compressed air
No voltage to pump Check input wiring, circuit breaker and switches
Pump fails to stop when faucets are closed
Empty water tank Add water
Insufficient voltage to pump motor Check battery voltage. If voltage is ok, pump is defective.

Holding Tank Drain Valves

Periodically the drain valve may become hard to open . It is recommended that the (2) two screws in top of mechanism be removed and pull paddle out. After cleaning paddle a coat of vaseline should be added to both surfaces and valve reassembled.

Clock /Thermometer Calibration Procedures

The thermometer section of the Clock/Thermometer indicates either the inside temperature or outside temperature , depending on the position of the panel pushbutton. It may be necessary to recalibrate the unit if there are differences between the actual inside or outside temperatures and the corresponding displays. Thermometer Calibration Procedures

  1. Place an accuratel y calibrated thermometer unit next to the outdoor temperature probe (located under metal shield on outside of lower roof rail near refrigerator vent) while the coach is in a protected environment away from direct sunlight, rain, winds, etc. Note the thermometer reading.
  2. Press in the outdoor panel switch and compare the digital display reading with the actual outside temperature noted previously. If the reading disagrees sufficiently to require calibration , open the monitor panel so that the rear of the thermometer unit is accessible. (If the readings agree , proceed to step 3.) Adjust the outdoor calibration control , located in the extreme left center of the rear panel, as necessary , to make the display agree with the thermometer reading.
  3. Place the calibrated thermometer unit next to the indoor temperature probe and note the thermometer reading.
  4. Press the Indoor panel switch and compare the digital display reading with the actual inside temperature noted previously . If the readings disagree sufficiently to require calibration , open the monitor panel so that the rear of the thermometer unit is accessible . Adjust the indoor calibration control , located on the lower lefthand side of the rear panel, as necessary , to make the display agree with the thermometer reading. Replace the monitor panel.

Tub /Shower Mixing Valve

1989 WB 40 Manual Figure 8-9 .png

The water mixing valve used in the tub/shower contains a pressure balancing spool valve , figure 8-9, to make sure there are no sudden temperature changes. Water mineral deposits which can accumulate in the valve body and spool valve will affect the normal operation of the mixing unit. To gain access to the valve body , remove the screws which hold the faceplate to the shower wall. (Water supply must be turned off.) Remove the control knob, then lift off the faceplate. To remove the spool, unscrew the large center screw and carefully withdraw the spool from the valve body. Inspect O-rings for damage and replace, if necessary . Flush out spool of any foreign material , then replace in valve. Replace faceplate and secure with screws . Replace knob.

Note In some units this pressure balancing valve is in a remote location under the bathroom lavatory vanity.

Air Step Speed Adjustment

The adjustments for the entrance step are located under the center portion of the step and are combined with sintered bronze exhaust filters. The extend adjustment is close to the center of step and the retract adjustment is to the rear. To adjust the extend or retract function, loosen the lock nut (7/15" wrench) and turn adjustment with blade type screw driver as follows. To increase speed turn counter-clockwise . To decrease speed turn clockwise. When adjustment is complete tighten lock nut.

Equipment Manufactures Information

Suspension: Ridewell RAD-227WB (Service Manual)

Equipment Manufacturer Model or Type Number Known Replacements / Aftermarket
Air Conditioner (Automotive) Motive Manufacturing Division 365710th Avenue , North Birmingham , AL 35234 Motivair
Awning Zip-Dee Incorporated 96 Crossen Avenue Elk Grove, IL 60007 Model BB (specify length)
Bath Vent Hammond Manufacturing Corp. P.O. Box 5393 2220 Raymond Drive Lansing , Ml 48905 Model CB-350-B Compact Blower
Burglar Alarm Kolin Industries , Inc. Box357 Bronxville, NY 10708 Cat. No. 120
CB Radio Audiovox Southeast 3770 Green Ind. Blvd. Chamblee , GA 30341 AUDIOVOX Model6000A
Central Air Conditioner Marine Development Corporation P.O. Box8570 Richmond, VA 23226 Cruisair Model ACA 14U
Chime Ron Levy Company P.O. Box2456 Smyrna , GA30081 Model GE-861
Closed Circuit TV Camera Mashnick Associates 1977 Scenic Highway , Suite 1D Snellville , GA 30278 SANYO Model VDC-3800
Closed Circuit TV Receiver Dotronix 794 7 Teak Way Rancho Cucamonga, CA 91730 Model 7D-0959-CV-4-P-OE-15, 7, 12M-50/60
Duct Booster Acar Industries 4563 Hamann Parkway Willoughby , OH 44094 Model 951553
Electric Heaters - Bedroom,Gally & Livingroom FASCO Industries , Inc. 81 O Gillespie Street Fayetteville , NC 28306 Model2450
Electric Heaters - Freeze Protection TPI Corporation P.O. BoxT-CRS Johnson City , TN 37601 Model BCIA05
Electric Heat Tapes Easy Heat, Inc. 31977 U.S. 20 East New Carlisle , IN 46552 MT Cables
Fan, Exhaust Fantast ic Vent Co. 4349 South Dort Hwy Burton , Ml 48529 Model 1000R
Fan, Portable Guest Corporation 17 Culbro Drive West Hartford, CT 06110 12-volt Oscillating
Fan, Roof Kool-O-Matic 1831 Terrace Road Niles Ml 49120 RU-12
Faucets, Bathroom Grohe America Inc. 900 Lively Blvd Wood Dale , IL 60191 Model 33.031
Faucets, Kitchen Stanadyne Moen Division 377 Woodland Avenue Elyria , OH 44036 Model7310A
Flourescent Lights Thin-Light 530 Constitution Avenue Camarilo, CA 9301 0 Model 2-411- 723
Food Center Scovill Industries NuTone Division Madison and Red Bank Roads Cincinnati , OH 45277 Power Unit , Model 251

Food Processor Model 256

Fuel Filter-Water Separator Racor Industries , Inc. 1137 Barium Road Modesto , CA 95351 Model 1 000FG Detroit Diesel Engine

Model500 FG Kohler Power Generator

Furnace Suburban Manuf acturing Co. P.O. Box399 Dayton , OH 37321 Dyna-Trail Model NT-16SW
Gas/Smoke Alarm P.M.M.I. , Inc. Drawer 10 Old Ocean, TX 77463
Ice Maker U-Line Corporation 8900 North 55th Street Milwaukee, WI 53223 Model Bl-45A
Instant Hot Water Kitchenaid Division Whirlpool Corporation World Street Troy , OH 45374 Konstant Hot KIH-160
LPG Alarm /Control P.M.M.I., Inc. Drawer 10 Old Ocean , TX 77463
LP Gas Grill W.C. Bradley Enterprises, Inc. P.O. Box 12040 Columbus , GA 31993 Charbroil ModelTG110
LPG Tank Manchester Tank & Equipment Co. 2738 Lithonia Industrial Blvd. Lithonia , GA 30058 No·. 6042
Leveling Jacks HWH Corporation R.R. 1 Moscow , IA 52760 AP 3179
Microwave/Convection Oven Sharp Electronics Corp. 725 Old Norcross Road Lawrence , GA 30245 Model R8580
Power Generator ONAN 1400734-DAve. NE Minneapolis, MN 55432
Radio (AM/FM Stereo Cassette) Robert Bosch Sales 2800 South 25th Ave. Broadvi ew, IL 60153 Equalizer-Model BEQ08E

Compact Disc PlayerModel CDP05

Radio Cassette Model ASQR06

Range and Oven Modern Maid 6075 Corners Parkway Norcross , GA 30092 Model KGT-341
Reading Lights Wemac /Puritan Bennett Div. 18475 Pacific St. Fountain Valley , CA 92708 Model 2510
Refrigerator Dometic P.O. Box490 Elkhart , IN 46515 RM 3801
Safeline Warning Device Omnifa c Corporation 1700 East Wh ipp Road Dayton , OH 45440 Model2
Shower Hose Kit Alsons Corporation 42 Union Street Hillsdale , Ml 49242 500 PB59
Shower Valve Stanadyne Moen Division 377 Woodland Avenue Elyria, OH 44036
Tank , Water Inca Plastics , Inc. 11 555 Packard Drive Middlebury , IN 46540
TV Antenna Tandy Distributor Products Swannanoa , NC 28788 Model 5MS550
Toilet CL Barr & Assoc . P.O. Box284 Tucker, GA 30316
Washer /Dryer Sears Roebuck and Co. 675 Ponce De Leon Ave. , N.E. Atlanta , GA 30308 Washer : 26K4090 Dryer: 26K8090
Water Heater Atwood Vacuum Machine P.O. Box95780 Chicago , IL 60694 Model EH M-11
Water Pump ITT JABSCO 1485 Daleway Costa Mesa , CA 92626 Model 36950-1180
Water Purifier Pure Water Enterprises , Inc. 343 Broad Street Lake Charles , LA 70607 Model7550


Equipment Options

Manuals & Reference Material

Owner's Manual

1989 Wanderlodge Wide Body Chassis Parts Catalog

Chassis Master Wiring 8v92 DDEC 1


1989 Wanderlodge Brochure Specs

Parts & Crossreferences


  • Landing Lights
    • Morse docking lights