HWH Leveling Jacks

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CAUTION! Block frame and tires securely before changing tires or crawling under vehicle.

Do not use leveling jacks or air suspension to support vehicle while under vehicle or changing tires.


Keep all people clear of vehicle while leveling system is in use. Lifting wheels off the ground may allow the vehicle to become unstable.


Never place hands or other parts of body near hydraulic leaks. OIL MAY CUT AND PENETRATE THE SKIN CAUSING INJURY OR DEATH.

System Components

HWH Leveling Jacks Paddle Switch Diagram.png

The leveling system consists of

1)  A computerized control panel with paddle type switches, indicator lights and fuse.

2)  A dash mounted warning light.

3)  Four hydraulic leveling jacks. One on each corner of the coach chassis.

4)  A solenoid controlled hydraulic valve.

5)  A 12 volt hydraulic pump and reservoir package.


1) . RED WARNING LIGHT (Dash Mounted)

Anytime one or more jacks are not fully retracted this light should be on. Do not move the vehicle if this light is on.

2) . ON - OFF SWITCH (On leveling system control panel)

Turn this switch OFF at any time to stop leveling or retracting functions. This switch operates the control power for the system. Turning this switch off will reset the micro processor to the start position.  When this switch is turned on the red indicator above the switch should come on indicating there is power to the panel.

3) . LOW VOLTS INDICATOR (On leveling system control panel)

The red low volts indicator is on the lower portion of the on - off switch. When on it indicates low voltage to the control panel. If the light comes on discontinue use of the system and check the power supply. If in automatic operation the system will automatically stop.

4) . YELLOW LEVEL INDICATOR LIGHTS (Four on leveling system control panel)

When a yellow light is on it is indicating that corner of the coach is low.


This switch is pushed momentarily to begin the automatic leveling or retracting process. When the switch is pushed toward automatic level; the auto leveling light on the top of the switch will begin flashing, one or two jacks will extend at a time to level the coach, then any remaining jacks will be extended under low pressure until they touch the ground to stabilize the coach, the auto level light will stop flashing, the panel will then shut off. When the switch is pushed toward automatic retract; the auto retract light will start flashing, the jacks will begin retracting, the solenoid valves will be held open for retracting for approximately 7 minutes, the light will stop flashing, the panel will then shut off.


Each of these switches will extend or retract the respective jack. The on - off switch must be on for these switches to be functional.

General Instructions

Turn the control panel OFF at any time to stop the operation of the system. NOTE: If the ignition switch is ON the vehicle's air suspension may return the vehicle to travel height.

Any time a hydraulic leveling process is interrupted, retract the jacks according to the "JACK RETRACTION" section and then restart the leveling.

If pump starts when on - off switch is turned on turn off and do not use. Jacks can not be retracted if pump is running, system must be repaired. See "DRAIN VALVE OPERATION" for retracting jacks if they can not be retracted from the control panel.

Do not operate the system when the "LOW VOLTS" light is on or when batteries are low. System components may be damaged and the processor may become erratic.

The engine alternator or generator will not provide an adequate power supply for the leveling system.

Automatic Leveling Procedure

  1. Apply parking brake. Place transmission in recommended parking position.
  2. Turn vehicle engine off.
  3. If the vehicle is parked on soft ground, blocks may be placed under the jacks for added support. [READ "AIR SUSPENSION SYSTEM" IN WANDERLODGE OWNERS MANUAL BEFORE CONTINUING]
  4. Dump the air from the air suspension system. (Dump tag axle first.)'
  5. Turn on the leveling system control panel On - Off switch. (If the On - Off was "On" turn 110ff11    and the "On". This resets the microprocessor to the start position.) The red light on the On - Off switch should be on.
  6. Press the automatic level/retract switch toward the 11 Automatic Leveling Position".   The red light on the 11Automatic Level" switch will start blinking, the jacks will level the coach, jacks not used for leveling will come down and touch the ground to stabilize the coach, the light will stop flashing and the panel will turn off automatically. NOTE: During this phase of operation there is a 5 second pause between the operation of each jack. If the vehicle is so far out of level that the leveling jacks cannot level the vehicle even when fully extended one or more of the yellow "Level Indicator" lights will remain lit.

Automatic Retract Procedure

  1. Start coach, turn the suspension dump switch to the up position.  When front and rear suspension is fully pressurized, put the tag dump switch in the up position. See "Air Suspension System" for complete operation instructions.
  2. Turn on-off switch On. (If the On-Off switch was "On" turn 110ff11    and then "On".· This resets the microprocessor to the start position.) Red light on switch should now be on.
  3. Press the toggle switch toward the "Automatic Retract" position.  The red light on the retract side now begin to bli nk. The jacks will now begin to retract. When the red warning light on the dash goes out. visually check that all jacks are within 2 inches of being fully retracted.  The coach may now be moved however do not turn the panel off. Allow the retract cycle to time out (approximately 7 minutes). The panel will then turn off automatically.

Manual Operation

  1. Set parking brake, place transmission in recommended position for parking, turn engine off.
  3. Dump suspension air at this time. (Dump tag axle first.)
  4. Jacks may now be extended (or retracted) as desired by pushing the respective lower switch toward extend (or retract.) after the jack has extended full stroke. Do not continue to hold the switch Extend jacks as needed to put out the yellow indicator lights.  Extend any remaining jacks until l they touch the ground to stabilize the coach. Note: More than one jack may be operated at once. Improved leveling response may often be achieved by operating the two front or the two side jacks together.
  5. Before retracting the jacks start the coach engine, turn the suspension pump switch to the up position. When the front and rear suspension is fully pressurized, put the tag dump switch in the up position. Jacks may now be retracted by manually holding the four switches toward retract or by using the automatic retract function.
  6. Turn leveling panel OFF when not in use.

Drain Valve Operation

  1. Use the drain valve for retracting the jacks only if the "Retract" or "Store" function on the control panel or the individual jack switches will not retract the jacks for travel. CAUTION: KEEP AWAY FROM WHEELS, DO NOT CRAWL UNDER COACH, KEEP A SAFE DISTANCE IN FRONT AND REAR OF VEHICLE. THE VEHICLE MAY DROP AND/OR MOVE FORWARD OR BACKWARD WITHOUT WARNING OR AS THE DRAIN VALVE IS OPERATED. OIL MAY SQUIRT OUT OF THE DRAIN VALVE WHEN FIRST OPENED
  2. Locate the drain valve. Usually under the right front corner of the coach. The drain valve is 3/4" X 2" X 5" and has four "T" pit cock type handles.
  3. Place a container under the drain valve to catch the oil.  All ow clearance for coach to lower. (Do not reuse oil. )
  4. Open the two outer valves slowly (two turns counter clockwise) to bleed the main cylinders on the two rear jacks.
  5. Open the two center valves slowly (two turns counter clockwise) to bleed the main cylinders on the two front jacks
  6. Check that all four jacks are now fully retracted.
  7. Close the four drain valves.
  8. The leveling system must now be repaired and refilled with oil before leveling system can be used again.

Servicing of the Leveling System

Hydraulic Oil

Retract the four leveling jacks before checking oil level.  Locate the hydraulic power unit. Clean any dirt away from the breather/filler cap in the oil reservoir. Check that the oil is within (1) inch of the top of the reservoir. The oil should be checked when the vehicle is first purchased and then on'ce every two years. More often if there is an oil leak in the system.

Use Dexron II transmission fluid in hydraulic reservoir.  Fill to within 1" of overflowing. Never use brake fluid or hydraulic jack fluid.

Visual Inspection

Periodically inspect the leveling jacks for damaged or missing parts such as pivot bolts, springs, roller bearings or stops. Check the hydraulic lines and wiring for damage or wear. Check that the jacks do not interfere with any part of the vehicle when they are in the horizontal position.

Operational Check

Review operator manual and confirm that system is operating correctly. Check warning switch operation by extending one jack approximately 4", check that the warning light on the dash came on, retract the jack, then repeat for other three jacks.

NOTE: If any of the above checks or inspections reveal a problem or if there are other problems or questions consult a qualified RV repair center, your vehicle or coach manufacturer, or HWH Corporation for service or repair.


<See the back of the attached PDF below>


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