HWH 110 Series, Operator'S Manual

TROUBLE SHOOTING

vehicle’s suspension and electrical system, as well as an understanding of the leveling system’s hydraulics and electronics
is required.

1. JACK RETRACTS AFTER COACH IS LEVEL.

  A. Hose or jack has external leak.     

  B. Fluid is leaking back to reservoir through control valve.

2. LEVELING JACKS WILL NOT RETRACT COMPLETELY.

  A. Actuator rod bent or scored (rod will not move freely).

  B. Jack clogged with mud or ice.

  C. Main rod bent or scored.

  D. Valve plunger not completely depressed by valve handle.

  E. Springs weak or broken.

  F. Hydraulic line pinched.

3. UNIT IS EXTENDED BUT NOT VERTICAL.

  B. Roller assembly frozen or missing.                                  

  C. Actuator rod bent.                                                             

  D. Actuator not functioning properly.                                     

4. IGNITION SWITCH ON, BUT NO POWER TO PUMP AND/

OR LIGHT.                                                                            

  A. Bad micro switch.

  B. Pump relay not functioning.

D. Bad rocker switch.

  C. 12 volts from main power source not present.

  G. Blown fuse.

  E. Faulty wire or electrical connection.

  F. Pump not grounded.

5. LEVELING LIGHTS (YELLOW) NOT FUNCTIONING

PROPERLY.                                                                     

  A. Yellow lights will not go out when vehicle is level: adjust

  sensing unit.                                                                       

6.WARNING LIGHTS (RED) NOT FUNCTIONING PROPERLY.

  A. Light will not come on: check for broken wire at warning

  switch on the jack.                                                               

  B. Lights will not go out: bad warning switch or wires are

  shorted to ground.                                                                   

  C. Check PC board.                                                          

8. HYDRAULIC PUMP ACTIVATES WITHOUT USE OF CONTROL

  C. Pump is not developing pressure.                                 

VALVE HANDLES.

B. Oil supply low in reservoir.

D. Broken hydraulic line.

7. HYDRAULIC PUMP ACTIVATES, BUT THE JACKS WILL

NOT EXTEND.                                                                      

  A. Micro switch out of adjustment.                                          

  D. Short in PC board.                                                          

  D. Broken spring on pivot rod.                                                  

A. Move the control lever to the full retract position and wait
two minutes.  Be sure the jack is fully retracted, then try again.

The following is a list of troubles, and possible solutions which might occur to the leveling system.

C. Pump relay stuck.

A. Control valve not in the full "EXTEND" position.

9. AIR WILL NOT DUMP FROM SUSPENSION.

A. Bad PC board.

B. Air dump solenoid valve bad.

10. SUSPENSION WILL NOT INFLATE.

A. Bad PC board.

B. Air dump solenoid stuck open.

B. More than two yellow lights on: replace sensing unit.

C. Check PC board.

NOTE: Only qualified technicians should install or repair leveling systems on vehicles.  A knowledge of hydraulics, welding, the

MP55.01

07NOV97