REPAIR STEPS
SOLUTION
DIAGRAMS
PROBLEM
MI91.2157
16APR98
Part 10 continued
d. For straight-
acting jacks.
The red lights do
not come on as the
jacks extend.
Recheck Part 5f of the Repair Steps.
e. For straight-
acting jacks.
The pump runs ap-
proximately 2 sec-
onds then shuts off.
Refer to Part 9b of the Repair Steps.
f. The vehicle will
not level itself ac-
cording to the yellow
lights.
REFER TO MP85.3454
g. Jacks do not ex-
tend to stabilize the
vehicle. The pump
runs under a load.
The stabilize valve is not opening. Retract the jacks and unplug the
leveling sensing unit from the control panel. Unplug the stabilize valve
and plug the harness plug for the stabilize valve into one of the jack
control valves. Run the system through the automatic mode. With no
yellow lights on the system will go into the stabilize mode immediately.
If the jack that is connected to the stabilize plug extends, replace the
stabilize valve. If the jack does not extend, the problem is the control
panel.
REFER TO MP85.3462
Retry the system in the manual mode. Check all connections, grounds
and voltage. The ground straps for the sensing unit and the pressure
switch wire are shielding cables. Poor grounds of these wires can cause
problems in the automatic mode. If everything is ok, the problem is in
the control panel.
GROUND
STRAP
TO FRAME
SENSING
UNIT
B
A
STAB.
PURPLE
BA
c. For straight-
acting jacks.
The pump runs, but
nothing happens.
Recheck the system in the manual mode. If the system works manual-
ly but not automatically the control panel should be repaired.
b. For systems with
automatic air dump:
The automatic level-
ing light is blinking
but the air will not
exhaust from the
vehicle suspension.
Check that the manual shut off on the air dump valves are open and
that the dump ports are clear of debris. Make sure the grounds for the
dump valves are good connections and not corroded.
With the automatic leveling light blinking, check the black wire in the
control harness at connection A. If +12 is not present, check that the
black wire is not broken then replace the control panel.
If +12 is present at connection A, check the black wire from the fuse
panel at connection B. If +12 is not present, replace the fuse panel.
If +12 is present, the problem is the dump valves, their grounds or the
wiring from connection B to the valves.
REFER TO MP75.3453
REFER TO MP85.3466
LOW
VOLTS
VERTICAL
RIGHT FRONT
MANUAL OPERATION
HORIZONTAL
BLOCK FRAME SECURELY BEFORE CHANGING TIRES OR
WORKING UNDER VEHICLE. MANUAL USE LIMITED TO 4 MIN. WITHOUT COOL DOWN
TO PREVENT DAMAGE FROM OVERHEATING, DO NOT HOLD SWITCH
ON FOR MORE THAN TWO OUT OF EVERY FOUR MINUTES.
EMERGENCY
MASTER
CAUTION!
LEFT REAR
LEVELING
RETRACT
AUTOMATIC
AUTOMATIC
ON
OFF
LEFT FRONT
RETRACT
HOLD
EXTEND
RETRACT
EXTEND
HOLD
5 AMP
RIGHT REAR
RETRACT
HOLD
EXTEND
A
B
ELECTRICAL
CONNECTION
DIAGRAM
HYDRAULIC
MANIFOLD
CONTROL HARNESS
CONNECTION A
LOW
VOLTS
VERTICAL
RIGHT FRONT
MANUAL OPERATION
HORIZONTAL
BLOCK FRAME SECURELY BEFORE CHANGING TIRES OR
WORKING UNDER VEHICLE. MANUAL USE LIMITED TO 4 MIN. WITHOUT COOL DOWN
TO PREVENT DAMAGE FROM OVERHEATING, DO NOT HOLD SWITCH
ON FOR MORE THAN TWO OUT OF EVERY FOUR MINUTES.
EMERGENCY
MASTER
CAUTION!
LEFT REAR
LEVELING
RETRACT
AUTOMATIC
AUTOMATIC
ON
OFF
LEFT FRONT
RETRACT
HOLD
EXTEND
RETRACT
EXTEND
HOLD
5 AMP
RIGHT REAR
RETRACT
HOLD
EXTEND
CONTROL PANEL
A
B
ELECTRICAL
CONNECTION
DIAGRAM
HYDRAULIC
MANIFOLD
CONNECTION A
CONNECTION B
CONNECTION B
REPLACEMENT VALVE WILL NOT
HAVE MANUAL SHUT OFF.
KEEP MANUAL SHUT OFF IN THE OPEN POSITION.
(PARELLEL WITH MANUAL VALVE BODY AS SHOWN.)
