Changes

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.  

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====

===Driving Tips===

'''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.  

==== '''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.

'''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.  

 

==== '''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.   

'''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===

===General Information===

====Detroit Diesel Engines====

===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.  

'''''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.)  

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====

===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.  

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====

===Fuel Line Heater===

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

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

===Leveling Jacks ===

===Leveling Jacks===

[[File:Leveling Jack Control Diagram.png|right|frameless|380x380px]]

[[File:Leveling Jack Control Diagram.png|right|frameless|380x380px]]

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.

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.