MI91.327Q
01NOV11
WARNING:
LOOSENING A HOSE OR CHECK VALVE CAP WHEN A JACK IS EXTENDED
COULD ALLOW THE VEHICLE TO DROP SUDDENLY CAUSING SEVERE INJURY OR DEATH.
DO NOT CRAWL UNDER THE VEHICLE UNLESS THE FRAME OF THE VEHICLE IS PROPERLY
B. NEITHER JACK WILL RETRACT WHEN THE DOWN ARROW BUTTON IS PUSHED. Try to extend
and retract a different pair of jacks. If the jacks extend and retract properly, continue with this section. If
jacks will extend but no jacks will retract, proceed to PART 7b. Section C. If you are pushing a front or
rear DOWN ARROW button, try pushing either side DOWN ARROW buttons. If you are pushing a side
DOWN ARROW button, try pushing either the front or rear DOWN ARROW button. If a jack now
retracts, the problem is the touch panel. If the jacks still do not retract, check the red LEDs for the
appropriate jacks when pushing the DOWN ARROW button.
1. If the red LED’s are not coming on, briefly push the corresponding UP ARROW button. If the
LED’s are coming on while pushing the UP ARROW button, replace the touch panel. If the LED’s
are not coming on while pushing the UP ARROW button, start over with PART 7a. Section E.
2. If the red LED’s are coming on, briefly push the corresponding UP ARROW button to extend the
the jacks do not extend, there may be a voltage or grounding issue. Again review PART 7b. Section A.
jacks. If the jacks extend, there is a problem with the jacks or hoses. Review PART 7b. Section A. If
C. NO JACKS WILL RETRACT WHEN PUSHING DOWN ARROW BUTTONS. Check the red LED’s for
the solenoid valves while briefly pushing an UP ARROW button then the corresponding DOWN ARROW
button. If the LED’s come on while pushing the UP ARROW button but not the DOWN ARROW button,
replace the touch panel. If the LED’s do not come on while pushing either button, start over with PART
7a. Section E. If the LED’s are coming on, the shuttle valve is most likely the issue. Loosen a hose at
the manifold. If the jack starts to retract, replace the shuttle valve. If the jack does not retract the issue
is the hose or the jack cylinder. SEE: MP64.3917
SUPPORTED.
Note: If the vehicle is stuck on the jacks due to a shuttle valve issue, removing an outer check
valve cap usually will allow the shuttle valve to shift so the jacks can be retracted normally.
IT IS IMPORTANT THAT ALL JACK SOLENOID VALVES ARE MANUALLY AND ELECTRICALLY
CLOSED. THE VEHICLE WILL DROP SUDDENLY AND A LARGE AMOUNT OF OIL WILL BE
RELEASED IF A CHECK VALVE CAP IS REMOVED WHILE ONE OR MORE JACK SOLENOID
VALVES ARE OPENED. There is a check valve cap for each solenoid valve. Remove the easiest
cap to reach and remove the check valve. After a brief moment, reinstall the check valve and
cap. It should now be possible to retract the jacks with the "STORE" button. If the jacks will
still not retract, contact HWH Technical Service for assistance. SEE: MP64.3917
PART 7b. CONTINUED
MANUAL SYSTEM OPERATION
725 TROUBLE SHOOTING STEPS
SEE: MP84.3170
MP84.3170
RIGHT REAR JACK
RIGHT FRONT JACK
ELECTRICAL CONNECTION DIAGRAM
MULTIPLEXED INPUT/OUTPUT MODULE
LED AND WIRE/CONNECTION INFORMATION
LEFT FRONT JACK
LEFT REAR JACK
WIRE DESCRIPTION AND FUNCTION
A1 - (+12 BLACK WIRE 8601) INPUT WHEN EXTENSION DEVICES ROOMS, GEN SLIDE, STEP COVER ECT. ARE USED
CAN HIGH COMMUNICATION WIRE
SWITCHED GROUND FROM RIGHT FRONT JACK WARNING SWITCH
SWITCHED GROUND FROM RIGHT FRONT JACK PRESSURE SWITCH
SWITCHED GROUND FROM RIGHT REAR JACK PRESSURE SWITCH
SWITCHED GROUND FROM 50 PSI MANIFOLD PRESSURE SWITCH
+12 VOLT POWER TO THE TOUCH PANEL
CAN LOW COMMUNICATION WIRE
GROUND TO THE TOUCH PANEL
SWITCHED GROUND FROM RIGHT REAR JACK WARNING SWITCH
SWITCHED GROUND FROM LEFT REAR JACK PRESSURE SWITCH
SWITCHED GROUND FROM 3000 PSI MANIFOLD PRESSURE SWITCH
+12 VOLT POWER FOR LEVEL SENSING UNIT
SHIELD WIRE FOR GREEN & YELLOW CAN COMMUNICATION WIRES
GROUND FOR LEVEL SENSING UNIT
SWITCHED GROUND FROM SENSING UNIT - REAR
SWITCHED GROUND FROM LEFT REAR JACK WARNING SWITCH
SWITCHED GROUND FROM SENSING UNIT - RIGHT SIDE
+12 VOLT ACCESSORY POWER FOR I/O MODULE
GROUND FOR JACK WARNING SWITCHES
SWITCHED GROUND FROM LEFT FRONT JACK WARNING SWITCH
SWITCHED GROUND FROM LEFT FRONT JACK PRESSURE SWITCH
SWITCHED GROUND FROM SENSING UNIT - LEFT SIDE
SWITCHED GROUND FROM SENSING UNIT - FRONT
GROUND FROM PARK BRAKE SWITCH
A LIT RED LED INDICATES THERE SHOULD BE
+12 VOLTS ON THE CORRESPONDING WIRE.
LINK LIGHT: LINK LIGHT FLASHING INDICATES PROPER
COMMUNICATION BETWEEN THE I/O MODULE AND THE
TOUCH PANEL. LINK LIGHT ON SOLID OR OFF INDICATES
NUMBER
BLACK
BLACK
WHITE
BLACK
BLACK
BLACK
WHITE
BLACK
BLACK
BLACK
BLACK
BLACK
RED
D1
D2
D3
D4
D6
D7
D8
D5
C6 AND C7
B6
B7
B8
C2
C3
C4
C8
C5
C1
N/A
RED
6120
6235
1000
0100
0200
9000
1200
4200
8100
N/A
6231
0400
0300
4000
6121
WIRE
COLOR
YELLOW
BLACK
BLACK
BLACK
BLACK
GREEN
WHITE
BLACK
A2
A3 AND A4
A6
A5
A7
A8
B1
B3
B4
B5
B2
RED
FRONT VIEW
OF I/O
MODULE
CONNECTOR
PIN #
N/A
2200
2000
3200
8101
6800
6230
3000
N/A
8
2
3
4
5
7 6
WIRE
NO CONNECTION
NO CONNECTION
NO CONNECTION
NO CONNECTION
NO CONNECTION
A FAILURE.
A
B
C
D
1
NOTE: DUMP AND TRAVEL LEDS PRESENT
BUT NOT ALWAYS USED
LINK LIGHT
MASTER RELAY
PUMP RELAY
MP84.3170
06JUN11
DUMP
TRAVEL
GROUND STUD
MP64.3917
NOTE: SOME
MANIFOLDS
ARE EQUIPPED
WITH VELOCITY
PRESSURE
SWITCH
REAR
LEFT
to be removed to access
shuttle valve and shuttle
valve tube.
3000PSI
PRESSURE
VALVES
HERE
CHECK
PUMP/MANIFOLD
VELOCITY VALVE
ASSEMBLY
LR
LF
RF
RR
REAR
MP64.3917
07JUN11
RIGHT
PRESSURE
SWITCH
OUTER
CHECK
SHUTTLE
VALVE
VALVES (4)
50PSI
PRESSURE
ALTERNATE
LOCATION
3000 PSI
SWITCH
VALVE RELEASE, READ AND UNDERSTAND
PROCEDURE FOR MANUAL JACK RETRACTION
IN OPERATOR’S INSTRUCTIONS. VALVES MAY
HYDRAULIC LINE CONNECTION DIAGRAM
(WITH 4 STRAIGHT-ACTING JACKS)
625/725 SERIES LEVELING SYSTEM
MANIFOLDS MAY HAVE FOUR (4) LARGE
VALVES OR FOUR (4) SMALL VALVES
BE EQUIPPED WITH VALVE RELEASE NUTS OR
LARGE AND
SMALL VALVES
WITH RELEASE
NOTE: Load center is
not shown, load center
may need to be removed
LEFT
FRONT
NUTS
BEFORE OPERATING MANUAL
BREATHER
CAP
RELEASE CAMS.
NOTE:
LARGE AND
SMALL VALVES
WITH RELEASE
CAMS
RIGHT
FRONT
