MI91.327N
01NOV11
PART 7a. SECTION K. CONTINUED
The jack warning switch has normally closed contacts. When the jack is retracted,
When pushing an UP arrow button, the appropriate
and the correct pin for the warning switch that is not coming on.
not come on, unplug the 32 pin connector from the I/O module. Check for continuity between pin D2
comes on, there is a problem with the white ground wire in the harness. If the warning light still does
wire. That will be the black wire going to the B pin in the packard connector. If the warning light now
the warning light does not come on, use the jumper to apply a good ground to the warning switch signal
harness Packard connector together. If the warning light now comes on, replace the warning switch. If
With the jack extended, unplug the warning switch. Use a small jumper to short the two pins in the
magnet is pulled away from the switch and the contacts close. When the contacts close, this completes
a magnet inside the jack is close to the switch and the switch contacts open. As the jack extends, the
A RED JACK DOWN WARNING LIGHT WILL NOT COME ON. THE JACK IS EXTENDED
maximum. Only change solenoid valves that allow the jacks to move more than discussed here.
in temperature, getting cooler, the movement of the rod should be no more than 3/8 to 1/2 inch
controlled environment, there should be no movement of the jack rods. If there is a possible change
for the amount of time the operator indicates it takes for the jacks to retract. If the vehicle is in a
the jack rod 1 inch down from the bottom of the cylinder tube. The vehicle should not be disturbed
lift the vehicle. Wait about 20 minutes and then use a felt marking pen or piece of tape to mark on
and mark all four jacks to determine which jack or jacks have an issue. Extend all jacks to slightly
Note: If the complaint is that the jacks retract slowly after a period of time, it is important to extend
not staying on, replace the solenoid valve(s). If the LED(s) are staying on when the UP arrow button
closed. Check the solenoid valve LED(s) for the jack(s) that will not stay extended. If the LED(s) are
There are no visible oil leaks. Make sure all manual release nuts or cam levers are fully
ONE OR MORE JACKS WILL NOT STAY EXTENDED AFTER THE UP ARROW BUTTON IS
is wrong, change the plumbing as necessary. DO NOT just change wiring.
plumbing and wiring diagrams. Change the wiring or plumbing to match the diagrams. If the plumbing
been working properly, this can only happen if wiring or plumbing is changed. Check the appropriate
THE WRONG JACKS EXTEND WHEN AN UP ARROW BUTTON IS PUSHED.
coming on. If it is, replace the I/O module. If the LED is not coming on, replace the solenoid valve.
Check the appropriate solenoid valve LED while pushing the UP arrow button. The LED is most likely
2. The jack that should not extend is staying down when the UP arrow button is released.
solenoid valve. (Make sure you are not pushing an UP arrow button that would operate that jack.)
I/O module. If the LED is not on or it is not coming on while pushing an UP arrow button, replace the
Check the solenoid valve LED for the jack that should not extend. If the LED is staying on, replace the
1. The jack that should not extend retracts as soon as the UP arrow button is released.
Right front switch is pin A5 - wire #2000
Left rear switch is pin - wire #4000
Right rear switch is pin - wire #3000
Left front switch is pin - wire #1000
SEE: MP84.3170
1/2 INCH OR MORE.
a ground circuit for the warning light.
SEE: MP64.3917 and MP84.3170
SEE: MP84.3170
SEE: MP64.3917 and MP84.3240
K.
RELEASED.
is released, replace the I/O module.
J.
I.
JACKS EXTEND BUT EXTEND SLOWLY OR WILL NOT LIFT THE VEHICLE.
A JACK EXTENDS WHEN IT SHOULDN’T.
jacks extend but a third jack is also extending.
H.
G.
SEE: MP84.3130 and MP84.3170
If the system has
There is low pump pressure or a shuttle valve problem. Go back to PART 7a. Section D.
MANUAL SYSTEM OPERATION
725 TROUBLE SHOOTING STEPS
MP64.3917
LEFT REAR JACK
LEFT FRONT JACK
MP84.3170
MASTER RELAY
LINK LIGHT
PUMP RELAY
GROUND STUD
TRAVEL
DUMP
LED AND WIRE/CONNECTION INFORMATION
MULTIPLEXED INPUT/OUTPUT MODULE
ELECTRICAL CONNECTION DIAGRAM
RIGHT FRONT JACK
RIGHT REAR JACK
NOTE: DUMP AND TRAVEL LEDS PRESENT
BUT NOT ALWAYS USED
BE EQUIPPED WITH VALVE RELEASE NUTS OR
VALVES OR FOUR (4) SMALL VALVES
MANIFOLDS MAY HAVE FOUR (4) LARGE
625/725 SERIES LEVELING SYSTEM
(WITH 4 STRAIGHT-ACTING JACKS)
HYDRAULIC LINE CONNECTION DIAGRAM
IN OPERATOR’S INSTRUCTIONS. VALVES MAY
PROCEDURE FOR MANUAL JACK RETRACTION
VALVE RELEASE, READ AND UNDERSTAND
shuttle valve and shuttle
CHECK
PRESSURE
WITH VELOCITY
ARE EQUIPPED
MANIFOLDS
NOTE: SOME
LEFT
REAR
valve tube.
VALVES
SWITCH
PRESSURE
3000PSI
HERE
ASSEMBLY
VELOCITY VALVE
PUMP/MANIFOLD
LR
LF
RF
RR
WITH RELEASE
SMALL VALVES
LARGE AND
to be removed to access
may need to be removed
not shown, load center
NOTE: Load center is
FRONT
LEFT
NUTS
BREATHER
BEFORE OPERATING MANUAL
CAP
RELEASE CAMS.
NOTE:
RIGHT
07JUN11
MP64.3917
REAR
VALVES (4)
SWITCH
PRESSURE
VALVE
SHUTTLE
CHECK
50PSI
LOCATION
ALTERNATE
PRESSURE
SWITCH
3000 PSI
WITH RELEASE
SMALL VALVES
LARGE AND
OUTER
CAMS
FRONT
RIGHT
MP84.3240
PUMP AND MASTER RELAYS
LEVELING SYSTEM HYDRAULIC MANIFOLD
ELECTRICAL CONNECTION DIAGRAM
SEE DETAIL (A)
MULTIPLEX I/O MODULE
TO GROUND STUD
1400
ON PUMP (6230)
4400
6230
6230
A
B
A
B
SWITCH
PRESSURE
3000 LB
8100
2400
6230
A
B
3400
6230
A
B
LR
P.E.D
P.E.D
LF
SWITCH
PRESSURE
50 LB
RR
P.E.D
P.E.D
RF
8101
SEE ELECTRICAL CONNECTION
DIAGRAM - 725 SERIES
SINGLE STEP LEVELING
SYSTEM
DEUTSCH CONNECTOR
GROUND STUD IN MANIFOLD
SHOWN HERE BENEATH THE
RELAY (A)
MASTER
MOTOR
PUMP
RELAY (B)
TOP VIEW
POWER UNIT
PUMP
MP64.3917
PUMP/MANIFOLD
VELOCITY VALVE
NOTE: SOME
MANIFOLDS
ARE EQUIPPED
WITH VELOCITY
SWITCH
3000PSI
PRESSURE
VALVES
REAR
LEFT
LR
ASSEMBLY
LF
RF
PRESSURE
REAR
MP64.3917
07JUN11
RIGHT
LOCATION
SHUTTLE
PRESSURE
SWITCH
VALVE
RR
50PSI
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
BEFORE OPERATING MANUAL
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
MASTER RELAY
PUMP RELAY
PRESSURE
HERE
CHECK
LARGE AND
SMALL VALVES
WITH RELEASE
NUTS
not shown, load center
may need to be removed
shuttle valve and shuttle
valve tube.
to be removed to access
NOTE: Load center is
LEFT
FRONT
RELEASE CAMS.
BREATHER
CAP
NOTE:
NOTE: DUMP AND TRAVEL LEDS PRESENT
BUT NOT ALWAYS USED
LINK LIGHT
ALTERNATE
RIGHT
FRONT
OUTER
CHECK
VALVES (4)
LARGE AND
SMALL VALVES
WITH RELEASE
CAMS
DUMP
TRAVEL
GROUND STUD
A FAILURE.
TOUCH PANEL. LINK LIGHT ON SOLID OR OFF INDICATES
COMMUNICATION BETWEEN THE I/O MODULE AND THE
LINK LIGHT: LINK LIGHT FLASHING INDICATES PROPER
+12 VOLTS ON THE CORRESPONDING WIRE.
A LIT RED LED INDICATES THERE SHOULD BE
PUMP RELAY
MASTER RELAY
LINK LIGHT
LED AND WIRE/CONNECTION INFORMATION
MULTIPLEXED INPUT/OUTPUT MODULE
ELECTRICAL CONNECTION DIAGRAM
BUT NOT ALWAYS USED
NOTE: DUMP AND TRAVEL LEDS PRESENT
CONNECTOR
MODULE
OF I/O
FRONT VIEW
1
8
6
7
5 4
3 2
D
C
B
A
GROUND STUD
TRAVEL
DUMP
LEFT REAR JACK
LEFT FRONT JACK
RIGHT FRONT JACK
RIGHT REAR JACK
MP84.3170
ELECTRICAL CONNECTION DIAGRAM
725 SERIES SINGLE STEP LEVELING SYSTEM
PARK BRAKE - MASTER WARNING LIGHT AND BUZZER
TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES
MANUAL
HWH COMPUTERIZED LEVELING
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
TOUCH PANEL
7699
7699
6120 - TO +12V ACC.
PRESENT ON ALL INSTALLATIONS
NOTE: DIODE ARRANGEMENT MAY NOT BE
DIODE
PARK BRAKE
LR
SWITCH
PRESSURE SWITCH
4200
SWITCH
WARNING
4000
B
A
6235
9000
9001 - TO
LIGHT
PARK BRAKE
15 AMP
FUSE
6111
LIGHT
DIODE
MASTER
WARNING
LF
SWITCH
_
CONNECT TO
12V IGNITION
+
6111
BUZZER
1000
5AMP
FUSE
1200
B
A
6235
BRAKE
CANCEL
STORE
AUTO
DO NOT CUT
WARNING!
MODE
TRAVEL
RETRACT
AUTO
LEVEL
R
NOT IN
PARK/
SLOPE
EXCESS
EXTEND
WARNING
PRESSURE
SWITCH
SEE ELECTRICAL CONNECTION DIAGRAM
MULTIPLEXED INPUT/OUTPUT MODULE
PRESSURE SWITCH
3200
WARNING
SWITCH
6235
3000
B
A
TERMINATING
DO NOT CUT
RESISTOR
11JUL11
MP84.3130
RR
8100
8101
SEE ELECTRICAL CONNECTION
PUMP AND MASTER RELAYS
LEVELING SYSTEM HYDRAULIC MANIFOLD
SEE ELECTRICAL CONNECTION DIAGRAM
SWITCH
DIAGRAM - SENSING UNIT
TERMINATING
RESISTOR
RETRACT
EXTEND
6235
2000
2200
B
A
WARNING
SWITCH
PRESSURE
RF
MP84.3130
WARNING
