Troubleshooting - HWH 310 Series Operator's Manual

The following is a list of problems, and possible solutions, which might occur to the leveling system.
NOTE: Only qualified technicians should install or repair leveling systems on vehicles. A knowledge of hydraulics, welding, the
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 solenoid valve.
2. LEVELING JACKS WILL NOT RETRACT COMPLETELY.
A. Jack clogged with mud or ice.
B. Main rod bent or scored.
C. Springs weak or broken.
D. Hydraulic line pinched.
3. IGNITION SWITCH ON, BUT NO POWER TO PUMP AND/
OR LIGHTS.
A. Park brake not set.
B. 12 volts from main power source not present.
C. Faulty control box.
D. Faulty wire or electrical connection.
4. PUMP WILL NOT ACTIVATE
A. Bad touch panel.
B. Bad control box.
C. Pump relay not functioning.
D. Pump not grounded.
5. HYDRAULIC PUMP ACTIVATES, BUT THE JACKS WILL
NOT EXTEND.
A. Bad solenoid valve.
B. Bad manifold pressure switch.
C. Oil supply low in reservoir.
D. Pump is not developing pressure.
TROUBLE SHOOTING
5. CONTINUED
E. Broken hydraulic line.
F. Bad control box.
G. Bad shuttle valve.
6. LEVELING LIGHTS (YELLOW) NOT FUNCTIONING
PROPERLY.
A. Yellow lights will not go out when vehicle is level: adjust
sensing unit.
B. If more than two yellow lights are on, replace the sensing
unit.
7. 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 the touch panel.
8. AIR WILL NOT DUMP FROM SUSPENSION
A. Bad control box.
B. Bad touch panel.
C. Air dump solenoid valve bad.
9. SUSPENSION WILL NOT INFLATE
A. Bad control box.
B. Air dump solenoid stuck open.
MP55.07
8SEP95