REPAIR STEPS
SOLUTION
DIAGRAMS
PROBLEM
MI91.2238
26JUN98
REFER TO MP85.5120
REFER TO MP65.0
5 AMP
10 AMP
10 AMP
5 AMP
5 AMP
10 AMP
10 AMP
REFER TO MP85.5043
Part 4 cont’d.
PRESSURE
TUBE
f. A jack is vertical
but has extended
the foot of the jack
to the ground.
The computer did not see the warning switch when the jack swung
vertical. The red light is on because the pressure switch tripped after
the jack touched the gound not because the warning switch tripped.
Refer to Part 4e to check the jack warning switches.
g. A jack is not ver-
tical nor is its red
light on. The jack
has not extended in
the horizontal pos-
ition.
On a new installation or after a repair, there could be air in the lines.
Turn the system off and retry several times. If there is no change, then
the problem is either a bad solenoid valve or control box. Check the
REFER TO MP85.5067
h. A jack has ex-
tended in the hori-
zontal postion.
Check that the roller bearing or actuator cable is ok. Check that the
hat stop is ok and adjusted properly. If these parts are ok, the prob-
lem is in the actuator and it should be replaced.
REFER TO MP85.5115
REFER TO MP85.5110
i. After going vert-
ical, a jack returns
to the horizontal pos-
ition after the pump
shuts off.
Push the "OFF" button. Push the "I" button twice. As the problem jack
goes vertical and its red light comes on, push the "OFF" button. If the
jack stays vertical, the control box is the problem. If the jack retracts,
the problem is the solenoid valve or the actuator. Check that the emer-
gency release valve on the solenoid valve is closed tight. Push the
"I" button twice. Push the raise manual button that will operate that
jack. Hold the button until the jack kicks vertical and extends and lifts
the coach. Release the button. If the jack retracts, replace the sol-
enoid valve for that jack. If it does NOT retract, the problem is prob-
ably the actuator on that jack.
Part 5
a. A jack extends
but will not lift the
coach.
Disconnect the tube between the shuttle valve and the manifold. Con-
nect the pressure gauge to the fitting in the manifold. Check the pump
pressure. If should be approximately 3500 psi. If the pump pressure
is ok, replace the shuttle valve.
b. A jack will not
retract.
For a 9000# jack, bleed pressure off between the jack and the actua-
tor. If the jack will not retract, replace the jack. If the jack starts to re-
tract, tighten the actuator tube and bleed pressure off between the ac-
tuator and the hydraulic supply line. If the jack does not retract, re-
LR FUSE
RF FUSE
AIR DUMP FUSE
RR FUSE
LF FUSE
GREEN RF
BLUE LF
ORANGE RR
BLACK PSI SWITCH
BROWN LR
ORANGE
GREEN
BLUE
BROWN
BLACK
RIGHT
REAR
RIGHT
FRONT
LEFT
FRONT
LEFT
REAR
(REAR
VIEW)
FRONT
RIGHT
REFER TO MP85.5067
GREEN
ORANGE
RIGHT
REAR
BROWN
BLACK
BLUE
FRONT
LEFT
LEFT
REAR
VIEW)
(REAR
place the actuator. If the jack starts to retract, then the problem is the
solenoid valve for that jack or a kinked hose to the jack. For 6000#
or 16000# jacks, bleed pressure between the actuator and the hydraul-
ic supply line. If the jack does not retract, replace the jack. If the jack
does retract, the problem is the solenoid valve for that jack or a kink-
ed hose to the jack. If none of the jacks will retract,
the shuttle
valve is stuck and should be replaced.
10 amp fuse for the malfunctioning jack. If the problem is a rear jack,
interchange the wires for the rear solenoids. Retract and try the ver-
tical mode again. If the problem stays with the same jack, change the
solenoid valve for that jack. If the problem follows the wire, change
the control box.
REFER TO MP85.5120
REFER TO MP85.5115
REFER TO MP85.5110
