TROUBLE SHOOTING
MI91.1060
21APR11
NOTES AND CHECKS
Read and check before proceeding with Trouble Shooting Steps.
NOTE: HWH CORPORATION ASSUMES NO LIABILITY
FOR DAMAGES OR INJURIES RESULTING FROM THE
INSTALLATION OR REPAIR OF THIS PRODUCT.
The Trouble Shooting Guide must be followed in order. Prob-
lems checked for in one step are assumed correct and not
checked again in following steps.
2.
retracted position.
JUMPER WIRES(UP TO 10 GAUGE)
PRESSURE GAUGE(3500 PSI MIN.)
MULTI-METER
12 VOLT TEST LIGHT
PROCEED WITH THE TROUBLE
SHOOTING STEPS ON THE
FOLLOWING PAGE
Check that the oil reservoir is full with the jacks in the fully
1.
4. Proper grounding of all components is critical. See the elec-
trical circuit for specific grounds required. Faulty grounds, es-
pecially for the control panel, solenoid manifold or the pump
assembly, may cause control panel component damage and/or
improper or erratic operation.
5. Do not replace the control panel unless the Repair Steps say
to replace it. Otherwise the malfunctions may damage the new
control box.
This manual is intended for use by experienced mechan-
ics with knowledge of hydraulic and automotive electrical
systems. People with little or no experience with HWH lev-
eling systems should contact HWH technical service at
(800-321-3494) before beginning. Special attention should
be given to all cautions, wiring, and hydraulic diagrams.
Special note: When installing a new control panel, make
sure the panel is properly grounded before applying power
to the system.
Suggested tools for trouble shooting the HWH leveling systems:
existing hose end, tighten the hose end to snug plus 1/4
tighten the hose end 1/3 turn (2 FLATS). If tightening an
make the hose end snug (finger tight) on the fitting, then
Tightening of hose ends: If tightening a new hose end,
turn (1 FLAT).
WARNING!
BLOCK FRAME AND TIRES SECURELY BEFORE CRAWLING UNDER VEHICLE. DO NOT USE THE LEVELING
JACKS OR AIR SUSPENSION TO SUPPORT VEHICLE WHILE UNDER VEHICLE OR CHANGING TIRES. VEHICLE
MAY DROP AND OR MOVE FORWARD OR BACKWARD WITHOUT WARNING CAUSING INJURY OR DEATH.
WHEN ROUTING OR REROUTING HYDRAULIC HOSES AND WIRES, BE SURE THEY ARE NOT EXPOSED TO ENGINE
EXHAUST OR ANY HIGH TEMPERATURE COMPONENTS OF THE VEHICLE.
THE JACKS MAY ABRUPTLY SWING UP WHEN THE FOOT CLEARS THE GROUND OR WHEN THE JACK REACHES
NEVER PLACE HAND OR OTHER PARTS OF THE BODY NEAR HYDRAULIC LEAKS. OIL MAY CUT AND
SAFETY CLASSES ARE TO BE WORN TO PROTECT EYES FROM DIRT, METAL CHIPS, OIL LEAKS, ECT. FOLLOW
DO NOT OVER EXTEND THE REAR JACKS. IF THE WEIGHT OF THE VEHICLE IS REMOVED FROM ONE OR BOTH
REAR WHEELS, THE VEHICLE MAY ROLL FORWARD OR BACKWARD OFF THE JACKS.
FULL EXTENSION.
PENETRATE THE SKIN CAUSING INJURY OR DEATH.
ALL OTHER SHOP SAFETY PRACTICES.
3. Most coaches have more than one battery; one for the engine
and the other(s) for the coach. The engine battery supplies
power for the control box and hydraulic pump. DO NOT use
the coach batteries to supply power to the pump. Batteries
under no load should read 12.6 volts. Batteries must maintain
good voltage under load. Batteries must be in good condition
with no weak cells. An alternator, converter or battery charger
will not supply enough power for the system to operate properly.
