TROUBLE SHOOTING
MI91.1087
21APR11
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
FULL EXTENSION.
NEVER PLACE HAND OR OTHER PARTS OF THE BODY NEAR HYDRAULIC LEAKS. OIL MAY CUT AND
PENETRATE THE SKIN CAUSING INJURY OR DEATH.
SAFETY GLASSES ARE TO BE WORN TO PROTECT EYES FROM DIRT, METAL CHIPS, OIL LEAKS, ECT. FOLLOW
ALL OTHER SHOP SAFETY PRACTICES.
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.
NOTES AND CHECKS
Read and check before preceding with Trouble Shooting Steps.
NOTE: HWH CORPORATION ASSUMES NO LIABILITY
FOR DAMAGES OR INJURIES RESULTING FROM THE
INSTALLATION OR REPAIR OF THIS PRODUCT.
JUMPER WIRES(UP TO 10 GAUGE)
PRESSURE GAUGE(3500 PSI MIN.)
MULTI-METER
12 VOLT TEST LIGHT
PROCEED WITH THE TROUBLE
FOLLOWING PAGE
SHOOTING STEPS ON THE
1. If the jacks cannot be retracted, see Trouble Shooting
Step 12 for temporary measures. Make sure the manual re-
tract 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
not checked again in following steps.
3. Check that the oil reservoir is full with the jacks in the
fully retracted position.
4. Most vehicles have more than one battery; one for the
engine and the other(s) for the vehicle. The engine battery
supplies power for the control box and hydraulic pump.
DO NOT use the vehicle batteries to supply power to the
pump. Batteries should read 12.6 volts. Batteries must be
in good condition with no weak cells. An alternator, converter,
convertor, or battery charger will not supply enough power for
the system to operate properly.
6. Proper ground of all components is critical. See the elec-
trical 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.
7. 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 mech-
anics with knowledge of hydraulic and automotive elec-
trical systems. People with little or no experience with
HWH leveling systems should contact HWH technical ser-
vice at 1-800-321-3494 before beginning. Special attention
should be given to all cautions, wiring, and hydraulic dia-
grams.
Special note: When installing a new control box, make sure
the box is properly grounded before applying power to
the system.
5. The control box automatically monitors these batteries
during the "AUTOMATIC LEVELING, RETRACT, AND MAN-
UAL" modes of operation. The system will stop its oper-
ation and the "battery" symbol on the touch panel will light
when either of the batteries voltages drops below 8.5-9.0
volts. Have the batteries properly charged to their full ca-
NOTE: Batteries and connections should be checked under
load with the pump running.
pacity. If a replacement control box is used, the battery symbol
will not work.
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).
