Troubleshooting - HWH 625S SERIES Service Manual

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.
NEVER PLACE HAND OR OTHER PARTS OF THE BODY NEAR HYDRAULIC LEAKS. OIL MAY CUT AND
PENETRATE THE SKIN CAUSING INJURY OR DEATH.
SAFETY CLASSES ARE TO BE WORN TO PROTECT EYES FROM DIRT, METAL CHIPS, OIL LEAKS, ECT. FOLLOW
ALL OTHER SHOP SAFETY PRACTICES.
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.
1. If the jacks cannot be retracted, see TROUBLE SHOOTING
PART 15 Step 2 for temporary measures. Make sure the
manual retract valves are closed before trouble shooting.
2. The Trouble Shooting Guide must be followed in order.
Problems checked for in one step are assumed correct and
may not be checked again in following steps.
3. Check that the oil reservoir is full with the jacks in the fully
retracted position. If the vehicle is equipped with HWH room
extensions, refer to the HWH Owners Manual for proper
position of the room when checking the oil level.
4. 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. 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.
5. Proper grounding of all components is critical. See the
electrical circuit for specific grounds required. Faulty grounds,
especially for the control box, solenoid manifold or the pump
assembly, may cause control box component damage and /or
improper or erratic operation.
TROUBLE SHOOTING
WARNING!
NOTES AND CHECKS
6. Do not replace the control box 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 mechanics
with knowledge of hydraulic and automotive electrical
systems. People with little or no experience with HWH
leveling systems should contact HWH technical service
(800-321-3494) before beginning. Special attention should
be given to all cautions, wiring, and hydraulic diagrams.
Special note: When installing a new control box, make
sure the box is properly grounded before applying power
to the system.
Tightening of hose ends: If tightening a new hose end,
make the hose end snug (finger tight) on the fitting, then
tighten the hose end 1/3 turn (2 FLATS). If tightening an
existing hose end, tighten the hose end to snug plus 1/4
turn (1 FLAT).
Suggested tools for trouble shooting the HWH leveling systems:
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
MI91.1142
25APR11