REPAIR STEPS
SOLUTION
DIAGRAMS
PROBLEM
MI91.2152
11MAY98
b. The leveling light
comes on and blinks.
The pump runs ap-
proximately 2 seconds
and shuts off. The
jacks do not go
vertical.
Unplug the pressure switch. Retry Part 9. If the jacks go vertical, re-
place the pressure switch. If the same problem repeats itself, check
the pressure switch wires to make sure they are not shorted to ground.
If the wires are ok, replace the control panel.
REFER TO MP85.3462
NO
NC
A
B
BLACK
WHITE
BA
REFER TO MP65.3455
b. A jack will not re-
tract.
Try to extend the jack. If the jack will not extend, return to Part 5 of
the Repair Steps. If the jacks will extend, the solenoid valve and fuse
panel (breaker panel) are ok. Take the hose loose from the jack, if the
jack retracts, check the hose for kinks or restrictions. If the hose is ok,
replace the solenoid valve. If the jack does not retract, replace the jack
if it is a straight-acting jack. If it is a kick-down jack, remove the tube
between the jack and the actuator or loosen the actuator clamps on
the 16,000# jacks. If the jack retracts, replace the actuator. If the jack
doesn’t retract, replace the jack.
c. No jack will re-
tract.
Try to extend the jacks. If the jacks will not extend, return to Part
5 of the Repair Steps. If the jacks will extend, the solenoid valves
d. For straight-acting
jacks. A red warn-
ing light will not go
out when the jack
is retracted.
Refer to Part 2b of the Repair Steps.
Part 8
When the H/V switch
is pressed to HOR-
IZONTAL:
a. A jack will not re-
turn to the horizon-
tal position.
Check that the hose to the actuator is not kinked. Check that the roller
assembly is ok. Check that the jack pivot points are free. If this is ok,
replace the actuator.
REFER TO MP65.3455
Part 9
After pushing the
Automatic Level-
ing switch to Level-
ing one time:
a. The Automatic
Leveling light will
not blink.
Replace the control panel.
STAB.
LEFT
REAR
+
H/V
RIGHT
FRONT
FRONT
LEFT
RIGHT
REAR
+
+
+
VALVE
SHUTTLE
CHECK
VALVES (4)
RIGHT
REAR
b. A red warning light
will not go out when
the jacks are in the
horizontal position.
Refer to Part 2b of the Repair Steps.
Part 7 continued
and fuse panel (circuit breaker panel) are ok. Check the return line
for kinks. If the return line is ok, replace the shuttle valve.
