HWH 725 SERIES User manual

SERVICE MANUAL
ML48380/MI91.0030
19MAR12
Single Step Touch Panel Leveling Control
BI-AXIS Hydraulic Leveling
FEATURING:
HWH CORPORATION
(On I-80, Exit 267 South)
2096 Moscow Road | Moscow, Iowa 52760
Ph: 800/321-3494 (or) 563/724-3396 | Fax: [phone]
www.hwh.com
725 SERIES HYDRAULIC LEVELING SYSTEM
HWH TOUCH PANEL-CONTROLLED
R
(Without Dump)
R
(With Dump)
(With Pilot Dump)
W
CORPORATION
HH
R
Straight-Acting Jacks
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
HWH COMPUTERIZED LEVELING
EXTEND
RETRACT
WARNING!
DUMP
MANUAL
CANCEL
LEVEL
AUTO
STORE
AUTO
PARK/
NOT IN
MODE
BRAKE
TRAVEL
SLOPE
EXCESS
R
MANUAL
RETRACT
EXTEND

SECTION 1
MI91.1132
01NOV11
SECTION
2
DIAGRAMS
SECTION
1
AND TROUBLE
SHOOTING
GUIDE
2 PART FOLDER
HOW TO USE MANUAL
Before beginning your repair, it is IMPORTANT to read the CAUTIONS and NOTES AND CHECKS in the first section, TROUBLE
SHOOTING GUIDE. In many cases this will save time and mistakes when trouble shooting a system.
This Repair Manual is offered as a guide only. It is impossible to anticipate every problem or combination of problems. For
any problems encountered that are not addressed in this manual, contact HWH Corporation for assistance. (800-321-3494)
PROCEED WITH SYSTEM OPERATION
AND
GLOSSARY
OPERATION
SYSTEM
This manual is written in two sections. Section 1 is System Operation and Trouble Shooting Steps. Section 2 is the
Diagrams and Parts Glossary. Begin diagnosis of the system with Section 1. This will give the correct operation and function
of the system. The Trouble Shooting Steps are written in order of operation. The Trouble Shooting Steps should be followed
in order to avoid improper diagnosis of the system. Section 2 contains diagrams and a parts glossary. Refer to diagrams as
directed in the Trouble Shooting Steps. The parts glossary explains the function of individual parts.
IMPORTANT: Plumbing and wiring diagrams are generic in nature. Refer to specific owner’s manuals when available
or contact HWH Corporation for specific diagrams when necessary.

TROUBLE SHOOTING
MI91.1143
01NOV11
WARNING!
BLOCK FRAME AND TIRES SECURELY BEFORE CRAWLING UNDER VEHICLE. DO NOT USE THE LEVELING
JACKS OR AIR SUSPENSION TO SUPPORT VEHICLE WHILE UNDER VEHICLE OR CHANGING TIRES. VEHICLE
MAY DROP AND OR MOVE FORWARD OR BACKWARD WITHOUT WARNING CAUSING INJURY OR DEATH.
WHEN ROUTING OR REROUTING HYDRAULIC HOSES AND WIRES, BE SURE THEY ARE NOT EXPOSED TO ENGINE
EXHAUST OR ANY HIGH TEMPERATURE COMPONENTS OF THE VEHICLE.
NEVER PLACE HAND OR OTHER PARTS OF THE BODY NEAR HYDRAULIC LEAKS. OIL MAY CUT AND PENE-
TRATE THE SKIN CAUSING INJURY OR DEATH.
SAFETY CLASSES ARE TO BE WORN TO PROTECT EYES FROM DIRT, METAL CHIPS, OIL LEAKS, ECT. FOLLOW
ALL OTHER SHOP SAFETY PRACTICES.
NOTES AND CHECKS
Read and check before proceeding with Trouble Shooting Steps.
NOTE: HWH CORPORATION ASSUMES NO LIABILITY
FOR DAMAGES OR INJURIES RESULTING FROM THE
INSTALLATION OR REPAIR OF THIS PRODUCT.
1. If the jacks cannot be retracted, see TROUBLE SHOOTING
PART 15 Step 2 for temporary measures. Make sure the
manual retract valves are closed before trouble shooting.
2. The Trouble Shooting Guide must be followed in order.
Problems checked for in one step are assumed correct and
may not be checked again in following steps.
retracted position. If the vehicle is equipped with HWH room
4. Most coaches have more than one battery; one for the
engine and the other(s) for the coach. The engine battery
supplies power for the I/O module or touch panel and hydraulic
pump. Batteries under no load should read 12.7 volts.
6. Do not replace the I/O module or touch panel unless the
Repair Steps say to replace it. Otherwise the malfunctions
may damage the new I/O module or touch panel.
5. Proper grounding of all components is critical. See the
electrical circuit for specific grounds required. Faulty grounds,
especially for the I/O module, touch panel, solenoid manifold
or the pump assembly, may cause component damage
and / or improper or erratic operation.
This manual is intended for use by experienced mechanics
with knowledge of hydraulic and automotive electrical
systems. People with little or no experience with HWH
leveling systems should contact HWH technical service
(800-321-3494) before beginning. Special attention should
be given to all cautions, wiring, and hydraulic diagrams.
Special note: When installing a new I/O module or touch
panel, make sure the I/O module or touch panel is properly
grounded before applying power to the system.
Suggested tools for trouble shooting the HWH leveling systems:
JUMPER WIRES TO 10 GAUGE)
PRESSURE GAUGE PSI MIN.)
MULTI-METER
12 VOLT TEST LIGHT
PROCEED WITH THE TROUBLE
SHOOTING STEPS ON THE
FOLLOWING PAGE
3. Check that the oil reservoir is full with the jacks in the fully
Batteries must maintain good voltage under load. Batteries
must be in good condition with no weak cells. An alternator,
converter or battery charger will not not supply enough
power for the system to operate properly.
existing hose end, tighten the hose end to snug plus 1/4
tighten the hose end 1/3 turn (2 FLATS). If tightening an
make the hose end snug (finger tight) on the fitting, then
Tightening of hose ends: If tightening a new hose end,
turn (1 FLAT).
extensions, refer to the HWH Owners Manual for proper
position of the room when checking the oil level.

MI91.1153
01NOV11
"CANCEL" BUTTON:
leveling system operation.
"AUTO LEVEL" BUTTON:
"AUTO STORE" BUTTON:
four jacks at the same time. WARNING LIGHTS:
"EXCESS SLOPE" LIGHT:
the leveling system cannot level the vehicle.
"NOT IN PARK/BRAKE" LIGHT:
when the hand/auto brake is not set and the "AUTO LEVEL"
"TRAVEL MODE" LIGHT:
when the ignition is on, when the jacks are retracted and
there are no red WARNING lights on.
MASTER "JACKS DOWN" WARNING LIGHT:
light mounted in the dash separate from the touch panel.
and the ignition is "ON".
BUZZER:
CONTROL FUNCTIONS
INDICATOR LIGHTS (CONTINUED)
CONTROL BUTTONS
Push this button to stop any
Push this button to retract all
This indicator will light when
This indicator will light
This indicator light will be on
This is a
This is a jacks down warning.
EXTEND BUTTONS (UP ARROWS):
RETRACT BUTTONS (DOWN ARROWS):
LEVELING LIGHTS:
These buttons will
extend their respective jack pairs to lift the vehicle.
These buttons
will retract their respective jack pairs to lower the vehicle.
The four yellow indicating lights are
level sensing indicators. When a yellow light is on, it
indicates that its side, end, or corner of the vehicle is low.
No more than two lights should be on at the same time.Push this button any time to
The four red lights surrounding the
yellow level indicators are jacks down WARNING lights.
They are functional only when the ignition is in the "ON"
extended 1/4 to 1/2 inch.
start the automatic leveling function.
It will sound if the master "JACKS DOWN"
CONTROL IDENTIFICATION
725 SERIES LEVELING SYSTEM
COMPUTER-CONTROL
or "ACC" position, the system is on, and the jacks are
It will be on when any one or more jacks are extended
button is being pushed.
RETRACT
EXTEND
HWH COMPUTERIZED LEVELING
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
"EXCESS SLOPE"
Indicator light
"AUTO LEVEL"
AUTO LEVEL/STORE
CANCEL Button
"NOT IN PARK"
Indicator light
Indicator light
"TRAVEL MODE"
Indicator light
Indicator light
AUTO LEVEL
"AUTO STORE"
Button
STORE
Button
RAISE LEFT SIDE
Manual button
LOWER LEFT SIDE
Manual button
STORE
AUTO
CANCEL
AUTO
LEVEL
TRAVEL
BRAKE
MODE
WARNING!
EXCESS
SLOPE
NOT IN
PARK/
R
LOWER FRONT
Manual button
RAISE FRONT
Manual button
JACK DOWN
Indicator light
RAISE RIGHT SIDE
Manual button
LOWER RIGHT SIDE
Manual button
LEVEL SENSING
Indicator light
(4) yellow
RAISE REAR
Manual button
LOWER REAR
Manual button
MANUAL
RETRACT
EXTEND (4) red
INDICATOR LIGHTS
AUTO LEVEL INDICATOR LIGHT: This light will flash
during the automatic leveling function.
STORE INDICATOR LIGHT: This light will flash during
the automatic store function.
When all four yellow LEVEL lights are out, the vehicle is
level. SEE OPERATOR’S PROCEDURES - AUTOMATIC
MANUAL
DUMP
"MANUAL DUMP"
Button
warning light is on.
"MANUAL DUMP" BUTTON: This is a manual button for
dumping air from the vehicle suspension.
HYDRAULIC LEVELING FOR DETAILED EXPLANATION.

MI91.1163
19MAR12
SYSTEM OPERATION
The 725 Single Step leveling system is a computer controlled, BI-AXIS push button system. This system has automatic or
optional manual control. This system will always extend two (2) jacks at the same time in the automatic or manual mode, both
front jacks, the left front and left rear jacks, the right front and right rear jacks or both rear jacks. In the manual mode, the jacks
are controlled by the UP and DOWN arrow buttons on the right hand side of the touch panel. The UP arrows extend jack pairs
and the DOWN arrows retract jack pairs.
If the vehicle is equipped with an air suspension, the air must be exhausted from the suspension before leveling the vehicle. If
the air is not exhausted, the suspension height control valves will interfere with the leveling procedure. There are two types of
air dump systems that HWH controls. One system uses air solenoid valves supplied by HWH. The second system is supplied
by the chassis manufacturer. This is a pilot air dump system. In the automatic mode, the air is dumped automatically before
the leveling process is started. For manual leveling, the HWH touch panel has a "DUMP" button. The "DUMP" button will work
if the ignition is on and the park brake is set. If the vehicle uses the HWH air dump valves, the "DUMP" button must be pushed
and held until all of the air is exhausted from the vehicle suspension system. The engine must be off. If a pilot air dump system
is used, the engine may be on or off. The "DUMP" button can be pushed and released. The pilot air dump system will return to
the travel position if the ignition is on and the "STORE" button is pushed or the park brake is released.
AUTOMATIC OPERATION
Push the "AUTO LEVEL" button one time. The AUTO LEVEL light will flash.
On the right hand side of the touch panel there are four (4) red and four (4) yellow indicator lights. The four red indicator lights
are JACK DOWN warning lights. There is one light for each jack. These warning lights come on when their respective jacks
are extended about 1/2 to 1 inch. The four yellow indicator lights are level indicators, front, left side, right side and rear. A lit
yellow level light indicates that a side, end or corner (side and end light on) is low. When all four yellow level lights are out, the
vehicle is level within the tolerance of the level sensing unit.
The computer will extend jack pairs according to the level lights starting with a lit side light. When all four level lights are out,
the computer will extend any jacks not used for leveling to stabilize the vehicle.
There are two parts to leveling a vehicle. First the vehicle is leveled. The jacks are used to turn all the yellow level indicators
off. The second part of leveling is to stabilize the vehicle. This is accomplished by extending any jacks not used for leveling to
the ground and lifting the vehicle about 3/4 to 1 inch.
NOTE: Releasing the park brake to return the suspension to travel mode (vehicle to ride height) is not recommended
for normal operation. This is a fail safe if the "STORE" button is not used to retract the jacks.
If applicable, the air will dump for twenty five (25) seconds before the leveling procedure starts.
The ignition must be in the "ON" or "ACC." position and the park brake must be set to use the system. The "TRAVEL MODE"
light will be on and one or two yellow level indicator lights may be on anytime the ignition is in the "ON" or "ACC" position. The
park brake must be set for the yellow level lights to work. The "NOT IN PARK/ BRAKE" indicator light will come on while the
"AUTO LEVEL" button is being pushed if the park brake signal is not present. The system will not function.
NOTE: If the vehicle is equipped with remote leveling system rocker switches, pushing a rocker switch to "LEVEL"
will start the automatic leveling process if the ignition is on and the park brake set. The rocker switch light will flash.
PUMP PROTECTION: The HWH system has pump protection built into the control system. An up and down timer
will turn the pump off and lock the system if a total of 3 minutes is reached. The master relay will not be on if this
happens. Example: The pump runs for 1 minute and is off for 20 seconds. The pump must run 2 minutes and
20 seconds more without interruption to turn the pump off. Any "OFF" time adds more run time for the pump.
This includes operation of HWH rooms. Turn the ignition off, push the "CANCEL" button or release the
WARNING: IF THE VEHICLE IS EQUIPPED WITH A PILOT AIR DUMP FOR THE SUSPENSION AND A BUTTON
IS PUSHED TO STOP THE AUTOMATIC LEVELING PROCESS, THE SUSPENSION WILL CONTINUE TO DUMP AIR.
PUSHING THE "STORE" BUTTON OR RELEASING THE PARK BRAKE AFTER THE LEVELING PROCESS IS STOPPED
WILL RETURN THE PILOT AIR DUMP TO THE TRAVEL POSITION, IF THE IGNITION IS ON.
LEVELING:
park brake to "UNLOCK" the system.
NOTE: The pump timer was changed to 4 minutes for systems with 3" pump motors and 6 minutes for systems
with 3.7" or 4.5" pump motors. Contact HWH Corporation for assistance.

MI91.1164
27MAR13
725 TROUBLE SHOOTING GUIDE
On the right hand side of the touch panel there are four (4) red and four (4) yellow indicator lights. The four red indicator lights
are JACK DOWN warning lights. There is one light for each jack. These warning lights come on when their respective jacks
are extended about 1/2 to 1 inch. The four yellow indicator lights are level indicators, front, left side, right side and rear. A lit
yellow level light indicates that a side, end or corner is low. When all four yellow level lights are out, the vehicle is level within
the tolerance of the level sensing unit.
Use the UP ARROW (Extend jack pairs) and DOWN ARROW (Retract jack pairs) buttons to extend jack pairs as needed to
level and stabilize the vehicle. Side level lights should be turned off before turning off front or rear level lights. Stabilizing should
The ignition must be in the "ON" or "ACC." position and the park brake must be set to use the system. The "NOT IN PARK/
BRAKE" indicator light will come on while pushing an UP or DOWN arrow manual button if the park brake signal is not present.
MANUAL OPERATION
If applicable, use the DUMP button to dump the air before extending jacks. Air should be completely exhausted from the vehicle
The system will not function.
suspension before starting a leveling process.
Excess slope is when two jacks extend as far as they can without turning a yellow level light out. The pump
will go to relief and trip a 3000# pressure switch on the leveling manifold. The "EXCESS SLOPE" light will come on. Jacks
that have not been extended will not extend when the "EXCESS SLOPE" light is on. The "EXCESS SLOPE" light will be on
whenever the ignition is on until the park brake is released (with the ignition on) or the jacks are completely retracted with the
The "CANCEL" button will stop the automatic leveling process any time. After pushing the "AUTO LEVEL" button to start the
automatic leveling process, pushing the "AUTO LEVEL" button again or pushing the "STORE" button will stop the automatic
leveling process. If the vehicle is equipped with remote leveling system rocker switches, pushing the rocker switch to "LEVEL"
or "STORE" will stop the automatic leveling process.
"STORE" button.
EXCESS SLOPE:
AUTOMATIC OPERATIONS CONTINUED. . .
STABILIZING: Each jack has a pressure switch. When the jack pressure switch is on, the computer knows that jack is on the
ground. Because of possible thermal contraction, it is important that all jacks have lifted the vehicle at least 3/4 of an inch. This
switch can be adjusted. The stabilizing mode has a specific sequence. The computer first checks the right rear jack pressure
switch. If the right rear pressure switch is off, the computer extends the right rear jack until that pressure switch comes on. If
the switch is on, or once the switch comes on, the computer then checks the left rear jack pressure switch. If the switch is off,
the computer extends the left rear jack until its pressure switch comes on. If the pressure switch was on, or once the switch
comes on, the computer rechecks the right rear jack, extending it if necessary. The computer then rechecks the left rear jack,
extending it if necessary. After checking and rechecking the right rear then left rear jacks, the computer then checks both front
jack pressure switches. If either pressure switch is off, the computer will run the pump and open both front jack solenoid valves.
When the computer sees both front jack pressure switches the computer shuts the pump off and turns the solenoid valves off.
If all yellow level lights are off, the system is now done.
LEVELING RECHECK: Because the coach can be "bumped" slightly during the stabilize procedure, a yellow level light can
come on during stabilize. If a yellow light comes on during stabilize, when the stabilize procedure is finished, the computer will
extend jack pairs as necessary to turn any lit yellow level lights off. After turning the level lights off, the computer will turn off no
matter what position the jack pressure switches are in.
be done using the front and / or the rear UP ARROWS.

MI91.1166
01NOV11
725 TROUBLE SHOOTING GUIDE
STORE MODE
The touch panel has a "STORE" button and light. The ignition must be in the "ON" or "ACC." position. The STORE light will
come on when the "STORE" button is pushed. The front jacks will retract for five (5) seconds before the rear jacks start to
retract. The STORE light will go out one (1) minute after the last of the four individual red WARNING lights go out. If the vehicle
The "STORE" button should always be used to retract the jacks. This allows the system to store any jack that extends due to
thermal expansion of the hydraulic fluid while traveling. When traveling, if a jack extends enough to allow a jack warning switch
to turn on, the processor will turn the appropriate solenoid valve on so the jack can retract. The master warning light and buzzer
will NOT come on at this time. If thirty (30) seconds after the solenoid valve is turned on the warning switch is still on, the
processor will turn the master warning light, the buzzer and the appropriate red WARNING light on the touch panel on. The
IMPORTANT: When testing a leveling system, all four sets of UP and DOWN arrow buttons should be used to make
sure the complete system operates correctly, including the red WARNING lights and the yellow LEVEL lights. If the
system will not work in the manual mode it is very unlikely the system will function properly in the automatic mode.
is equipped with an air suspension, the leveling system will return to the travel mode when the "STORE" button is pushed.
Pushing the "CANCEL", the "AUTO LEVEL" or "STORE" button after starting the automatic store procedure will halt the
automatic store procedure.
NOTE: If the vehicle is equipped with remote leveling system rocker switches, pushing the rocker switch to STORE
will start the automatic store procedure. Pushing the rocker switch either direction will halt the automatic store
procedure.
WARNING: IF THE VEHICLE IS EQUIPPED WITH A PILOT AIR DUMP SYSTEM, THE SUSPENSION WILL DUMP
AIR AND START TO DROP AS SOON AS AN AUTOMATIC LEVEL BUTTON OR ROCKER SWITCH IS PUSHED.
ALTHOUGH THE AUTOMATIC LEVELING PROCEDURE WILL HALT WHEN AN "CANCEL", "STORE", "AUTO LEVEL"
OR ROCKER SWITCH IS PUSHED, THE VEHICLE SUSPENSION WILL CONTINUE TO DROP.
solenoid valves will turn off.

MI91.327A
01NOV11
725 TROUBLE SHOOTING STEPS
MANUAL OPERATION
NOTE: The following diagnostic functions are written in order of operation and should be checked in this order.
Failure to do so may cause improper diagnoses of the problem(s) and increase the time needed to repair the system.
PART 1. TOUCH PANEL TO I/O MODULE COMMUNICATION CHECK.
A. Neither link light is on,
SEE: MP84.3170 and MP84.3334
IMPORTANT: Due to painting techniques of chassis rails or components and the construction of the chassis’s, it is
possible to have grounding issues between frame rails. When voltage issues are addressed, it is important to check
chassis grounds, positive voltage connections and battery condition to ensure a good DC voltage circuit for the
vehicle. Problems with these items, especially the chassis grounds, will create voltage issues for the HWH
equipment.
Note: Only review this section as an educational aid or if directed to PART 1 from other diagnostic steps in this
manual.
There should be communication between the touch panel and the I/O module anytime the ignition is in the ON or
ACC. position. The touch panel and the I/O module each have a "Link Light". If both link lights are flashing, this
indicates proper communication between the touch panel and I/O module. If either link light is off or on but not
flashing, there is a communication problem. The link lights will flash with the park brake on or off but the ignition
must be in the ON or ACC position.
CAN Information: Communication between the touch panel and I/O module is provided by a twisted pair of yellow and green
check the "TRAVEL MODE" light on the touch panel. If the
"TRAVEL MODE" light is off, there may be no power to the touch panel or I/O module,
B. If the "TRAVEL MODE" light is on or one link light is on or flashing, turn the ignition
off. There must be no power to the I/O module for the following tests. Make sure the yellow
connector. If there is proper resistance of 60 ohms (±10%)
and green wires are properly seated into the 32 pin and 5 pin connectors. If the wires and
or the touch panel. There is no good test to determine which is bad. The touch panel would
SEE: MP84.3334
Note:
If the ohm meter shows improper resistance, unplug the touch panel and check pins 1
SEE: MP84.3170
and 2 of the harness connector. If the resistance is now ok, replace the touch panel. If the
resistance is still incorrect, plug the touch panel back in and unplug the 32 pin I/O module
connector. Check between pins A2 and B2 of the 32 pin harness connector. If the resistance
is good, replace the I/O module. If the resistance is incorrect, there is a problem with the yellow
wires. At each end of the harness there is a 120 ohm resistor connecting the two wires. These are called terminating resistors.
The yellow wire is in pin A2 of the 32 pin I/O module connector and pin 1 of the 5 pin MTA touch panel connector . The green
wire is in pin B2 of the 32 pin I/O module connector and pin 2 of the 5 pin MTA touch panel connector. When using an ohm meter
to check the yellow and green communication wires, the meter should show 60 ohms, ±10 % when checking between the two wires.
check resistance between pins 1 and 2 at the 5 pin touch panel
PUMP RELAY
MASTER RELAY
LINK LIGHT
18 67 5 4 3 2
D
C
B
A
TRAVEL
DUMP
MP84.3170
PIN 1
LINK LIGHT
PIN 1PIN 4
MP84.3334
pins are properly seated, the problem is the I/O module
Although the resistance between the green and yellow wire is good, it may be possible
that a wire may be shorted to another wire in the harness that affects communication but not
the resistance of the terminating resistors. If the resistance shown with the touch panel and
I/O module plugged in is ok, unplug both and check for continuity between the yellow then
green wires and the other wires in the 32 pin connector. There should be no continuity.
go to PART 4, section B of the trouble shooting steps.
be the easiest to try first.
and green communication wires.
MP84.3170
LINK LIGHT
MASTER RELAY
PUMP RELAY
5768A
B
C
D
234 1
DUMP
TRAVEL

MI91.327B
19MAR12
PART 3. THE PUMP RUNS ANY TIME THE IGNITION IS ON.
A. The pump starts to run when the ignition is turned on.
SEE: MP84.3170 Check the red pump LED on the I/O module:
1. The pump LED is off.
If the pump runs with the
ignition on, proceed to PART 4.A.
THE PARK BRAKE SET AND ALL JACKS FULLY RETRACTED, THE
PART 4. WITH THE IGNITION ON,
"TRAVEL MODE" LIGHT ON THE TOUCH PANEL SHOULD BE ON. NO RED WARNING LIGHTS ON THE TOUCH PANEL
SHOULD BE ON. THE MASTER "JACKS DOWN" WARNING LIGHT AND BUZZER SHOULD NOT BE ON. ONE OR TWO
YELLOW LEVEL INDICATOR LIGHTS MAY BE ON BUT NOT OPPOSING LEVEL INDICATOR LIGHTS.
Important: You should not allow the pump to run under a load for more than four (4) minutes without allowing the
pump motor to cool. If the pump motor is extremely hot to the touch, allow the motor to cool.
Turn the ignition off and remove wire 8600 from terminal #6 of the pump relay.
Turn the ignition back on. If the pump runs, the relay is stuck and has to be replaced. If the pump does
not run, touch the 8600 wire to terminal #6. (The red pump LED could be burnt out.) If the pump does
not run, the problem was a stuck relay and the relay should be replaced. (Bumping a relay, such as
removing the 8600 wire, could cause the relay contacts to open.) If the pump starts to run, the problem
is the touch panel or the I/O module. (Either way, replace the I/O module because the pump LED is
burnt out.) Unplug the touch panel and with the ignition on, touch the 8600 wire to terminal #6. If the
pump runs, the problem is the I/O module. If the pump does not run, the problem is the touch panel
SEE: MP84.3240
Turn the ignition off and unplug the touch panel. Turn the ignition on. If the pump runs, the problem
2. The pump led is on. NOTE: If the vehicle is equipped with HWH rooms, unplug the pump
is the I/O module. If the pump does not run, the I/O module or touch panel could be the problem.
B. The "TRAVEL MODE" light is not on, none of the four (4) individual red warning lights are on.
If any other touch panel light is on, replace the touch panel. If no other touch panel lights are on, push
the "STORE" button. The STORE light should start to flash.
1. The STORE light starts to flash or any other touch panel light comes on. Replace the
touch panel.
2. The STORE light does not flash and no touch panel light comes on. There may be
no power or ground to the touch panel. Check the link light on the back of the touch panel.
If the link light is on or blinking, replace the touch panel. If the link light is off, check for +12
volts between pins 4 and 5 of the five (5) pin MTA connector at the touch panel. SEE: MP84.3334
If there is power between pins 4 and 5, replace the touch panel.
check pin 5 to a known good ground.If there is no power, If there is power on pin 5
there is a problem with the white 6230 ground wire from the I/O module. Unplug the 32 pin connector
at the I/O module. Check pin B3 of the I/O module plug for ground. SEE: MP84.3170
to ground,
be moved to the ACC. side of the vehicle ignition switch. The red 6120 wire is on pin D1 of the 32 pin
6120 wire that is part of the touch panel harness is connected to a constant power source and should
SEE: MP84.3130
A. If the touch panel has any indicator lights on or will function with the ignition off,
HAVE NO INDICATOR LIGHTS ON AND SHOULD NOT FUNCTION.
WITH THE IGNITION OFF, THE HWH TOUCH PANEL SHOULD
connector at the Multiplexed I/O Module.
PART 2.
the red
MANUAL OPERATION
725 TROUBLE SHOOTING STEPS
or I/O module.
request wire coming from the 32 pin I/O module connector. If now the pump does not run,
the problem is with the room controls or wiring. Contact HWH Corporation for assistance.
TO +12V ACC.
15 AMP
FUSE
DO NOT CUT
TERMINATING
RESISTOR
MANUAL
HWH COMPUTERIZED LEVELING
SECURELYBEFOREREMOVING TIRES OR CRAWLING UNDER VEHICLE.
UNDERSTANDOPERATOR’SMANUAL BEFORE USING. BLOCK FRAME AND TIRES
TOUCH PANEL
BRAKE
CANCEL
STORE
AUTO
WARNING!
MODE
TRAVEL
RETRACT
AUTO
LEVEL
R
NOTIN
PARK/
SLOPE
EXCESS
EXTEND
RETRACT
EXTEND
TERMINATING
DO NOT CUT
RESISTOR
MP84.3130
PIN 4 PIN 1
MP84.3334
PIN 1
MP84.3170
LINK LIGHT
LINK LIGHT
MASTER RELAY
PUMP RELAY
5768A
B
C
D
234 1
DUMP
TRAVEL
CONTROL
8600 - (BLACK)
PUMP RELAY
#9
+
MOTOR
PUMP
PUMP
RELAY (B)
#7
#4
#5
#6
MP84.3240
MP84.3170
PUMP RELAY
MASTER RELAY
8 67 5
D
C
B
A
1
4 3 2
TRAVEL
DUMP
LINK LIGHT

MI91.327C
01NOV11
C. The "TRAVEL MODE" light is NOT on. A red warning light on the touch panel is on.
are fully retracted. The ignition is on and the park brake is set. Unplug the warning switch for the jack
that has a lit warning light.
If voltage is not present on pin D1,
If the warning light goes out,
the problem is the red 6120 wire, its power source or it’s
connection to the harness plug. Check any fuse for the 6120 wire. If a fuse is blown,
the fuse, plug the harness back into the I/O module and recheck the touch panel. If the fuse continues
to blow, the 6120 wire or the 6800 wire in the harness could be shorted to ground. If neither wire is
shorted, the I/O module or the touch panel could be the problem. Unplug the 32 pin connector at the
I/O module and unplug the touch panel. At the 32 pin connector, check that pin B1 (6800 wire) and
D1 (6120 wire) have no continuity to any other pin in the connector or to ground. Repair as necessary.
If the harness is ok, plug the 32 pin connector back in and replace the fuse (leave the touch panel
unplugged). If the fuse blows, replace the I/O module. If the fuse does not blow, plug the touch
panel in and replace the fuse. If the fuse blows, replace the touch panel. If the fuse does not blow,
If the fuse for the 6120 wire is good, use a meter or test light to check the power source for the 6120
wire. If there is no power at the source, this must be repaired. Contact the vehicle manufacturer for
assistance with locating the power source for the 6120 wire. SEE: MP84.3130
If voltage is present on pin D1 of the harness connector, check for continuity between pins
B1 and D1 of the 32 pin I/O module connector (not the harness plug). If there is no continuity,
replace the I/O module. If there is continuity, there is a problem with the red 6800 wire in the
harness, with its connection to the I/O module or its connection to the 5 pin MTA connector
If the "TRAVEL MODE" light is still not on, review PART 4 section B again.
SEE: MP84.3130
NOTE: If more than one warning light is on, address each one individually.
either the warning switch is bad or the magnet in the jack is bad.
With the warning switch removed from the jack, there should be continuity between the two switch
wires. If a magnet is held to the bottom of the switch, there should be no continuity between the
two wires. If the warning switch is good, the jack cylinder will have to be replaced.
SECTION B.2. CONTINUEDPART 4.
replace
All Jacks
continue.
harness connectors has a problem. After repairing the problem with the 6230 wire, make sure the
"TRAVEL MODE" light comes on. If it does not come on, start at the beginning of section B again.
I/O module. This ground wire goes to a ground connection on the side of the pump. Check this
connection and the pump mounting or a grounding cable if used. If the grounds for the pump and
and check pin D1 in the harness plug for +12 volts. (If the link light on the I/O module is on or
the white 6230 wire in the harness to the touch panel or at one of
check the white 14 gauge ground wire coming from the top of the
SEE: MP84.3240
unplug the 32 pin connector at the I/O module
If there is a ground on pin B3,
If there is no ground on pin B3,
I/O module are ok, replace the I/O module.
If there is no power on pin 5 at the touch panel,
blinking, there is power on pin D1 in the harness plug.)
MANUAL OPERATION
725 TROUBLE SHOOTING STEPS
SEE: MP84.3170
SEE: MP84.3170
MULTIPLEX I/O MODULE
DETAIL (A) - TOP VIEW
TO GROUND STUD
ON PUMP (6230)
MP84.3240
MP84.3170
MASTER RELAY
PUMP RELAY
B
C
D
5768A 234 1
TRAVEL
DUMP
LINK LIGHT
MP84.3130
MP84.3170
MASTER RELAY
8 67 5 A
D
C
B
1432
LINK LIGHT
PUMP RELAY
TRAVEL
DUMP
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
HWHCOMPUTERIZED LEVELING
SECURELYBEFOREREMOVINGTIRESOR CRAWLING UNDER VEHICLE.
UNDERSTANDOPERATOR’SMANUALBEFOREUSING. BLOCK FRAME AND TIRES
TOUCH PANEL
76997699
6120 - TO +12V ACC.
PRESENTON 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
FUSE
15AMP
6111
LIGHT
DIODE
MASTER
WARNING
LF
SWITCH
_
CONNECT TO
12V IGNITION
+
6111
BUZZER
1000
5AMP
FUSE
1200
B A
6235
BRAKE
CANCEL
STORE
AUTO
DONOT CUT
WARNING!
MODE
TRAVEL
RETRACT
AUTO
LEVEL
R
NOTIN
PARK/
SLOPE
EXCESS
EXTEND
WARNING
PRESSURE
SWITCH
SEEELECTRICAL CONNECTION DIAGRAM
MULTIPLEXEDINPUT/OUTPUT MODULE
PRESSURE SWITCH
3200
WARNING
SWITCH
6235
3000
B A
TERMINATING
DONOT CUT
RESISTOR
08JUN11
MP84.3130
RR
8100
8101
SEEELECTRICAL CONNECTION
PUMPAND MASTER RELAYS
LEVELINGSYSTEM HYDRAULIC MANIFOLD
SEEELECTRICAL CONNECTION DIAGRAM
SWITCH
DIAGRAM- SENSING UNIT
TERMINATING
RESISTOR
RETRACT
EXTEND
6235
2000
2200
B A
WARNING
SWITCH
PRESSURE RF
RESISTOR
ELECTRICAL CONNECTION DIAGRAM
725 SERIES SINGLE STEP LEVELING SYSTEM
PARK BRAKE - MASTER WARNING LIGHT AND BUZZER
TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES
PRESSURE SWITCH
SEEELECTRICAL CONNECTION DIAGRAM
MULTIPLEXEDINPUT/OUTPUT MODULE
SEEELECTRICAL CONNECTION
DIAGRAM- SENSING UNIT
LEVELINGSYSTEM HYDRAULIC MANIFOLD
SEEELECTRICAL CONNECTION DIAGRAM
SWITCH
WARNING
MP84.3130
DONOT CUT
9001 - TO
DIODE
TERMINATING
LIGHT
PARK BRAKE
NOTE:DIODE ARRANGEMENT MAY NOT BE
PRESSURE SWITCH
4000
AB
4200
6235
PRESENTON ALL INSTALLATIONS
6120 - TO +12V ACC.
LR SWITCH
WARNING
FUSE
15AMP
6111
CONNECT TO
12V IGNITION
BUZZER
SWITCH
WARNING
9000
1000
7699
6111
DIODE
PARK BRAKE
SWITCH
WARNING
LIGHT
MASTER
+
7699
5AMP
1200
FUSE
LF SWITCH
PRESSURE
AB
6235
MANUAL
UNDERSTANDOPERATOR’SMANUALBEFOREUSING. BLOCK FRAME AND TIRES
SECURELYBEFOREREMOVINGTIRESOR CRAWLING UNDER VEHICLE.
HWHCOMPUTERIZED LEVELING
TOUCH PANEL
DONOT CUT
LEVEL
AUTO
STORE
AUTO
_
PARK/
BRAKE
R
EXTEND
SLOPE
EXCESS
NOTIN
RETRACT
MODE
TRAVEL
CANCELWARNING!
TERMINATING
RESISTOR
EXTEND
RETRACT
6235
3000
AB
3200 08JUN11
MP84.3130
WARNING
SWITCH RR
8101
8100
6235
PUMPAND MASTER RELAYS
2200
SWITCH
PRESSURE
2000
AB
RF
at the touch panel.

MI91.327D
01NOV11
PART 4. SECTION C. CONTINUED
E. Opposing yellow level indicator lights on the touch panel are on. Check the link light on the back
1. The yellow level indicator lights on the touch panel all go out.
of the touch panel. If the link light is off or on steady, replace the touch panel. If the link light is flashing,
check the four yellow LEDs on the bottom of the sensing unit. If opposing LEDs are on, replace the
sensing unit. If only one LED or no LEDs are on,
SEE: MP84.3430
Use a test light connected
to a good ground to check the four pins that are connected to the signal wires. SEE: MP84.3430
Touch one pin at a time with the test light. Check that the appropriate touch panel level light
comes on. If the touch panel lights work properly, replace the sensing unit. If the touch panel
lights do not work properly when grounding the harness pins, unplug the 32 pin connector at the
I/O module and leave the sensing unit unplugged. There should be no continuity between the four
signal wire pins, C4, C8, D6 and D7. If necessary, repair any problems with the harness. If the
harness checks out OK, the problem is the I/O module or touch panel. SEE: MP84.3170
2. One or more yellow indicator lights on the touch panel remain on. Unplug the 32 pin
connector at the I/O module and leave the sensing unit unplugged. There should be no continuity
between pins C4, C8, D6 and D7 (sensing unit signal wires) of the 32 pin harness connector and
any other pin in the connector. There should be no continuity between the four signal wire pins,
C4, C8, D6 and D7. There should be no continuity between the four signal wire pins and chassis
ground. If necessary, repair any problems with the harness. If the harness checks out OK, plug
SEE: MP84.3170
At the six pin sensing unit harness plug, using a volt meter, check and record the voltage between
the ground and power wire in the plug.SEE: MP84.3430
Now check between the ground wire and each of the four signal wires in the plug. The voltage
between the ground wire and a signal wire should be within less than 1 volt of the recorded
voltage. If the voltage reading on the four signal wires is OK, replace the touch panel. If the
voltage on any signal wire is not within less than 1 volt of the recorded voltage, replace the
I/O module.
F. The "NOT IN PARK/BRAKE" light is on. If the "NOT IN PARK/BRAKE" light is on and no
touch panel button is being pushed, replace the touch panel.
unplug the 32 pin connector at the I/O module. Check for
continuity between the signal wire for the warning switch and the ground wire for the warning switches
on pin D2. If there is continuity, the wires are shorted and need to be repaired. If there is no continuity
between the warning switch signal wire and the ground wire on pin D2, check for continuity between the
warning switch signal wire and chassis ground. If there is continuity to ground, the warning switch
signal wire is shorted to ground and must be repaired. If there is no continuity to ground, check and
record the voltage between pin D1 of the 32 pin harness connector and the brass ground stud on the
top of the I/O module. Plug the 32 pin connector back in. Check the voltage between the ground and
signal wire in the warning switch plug. The voltage should be within less than 1 volt of the voltage you
recorded on pin D1 of the harness connector. If the voltage is good, replace the touch panel. If there is
a difference in the voltage greater than 1 volt, the I/O module needs to be replaced.
D. The master warning light and buzzer are on along with the "TRAVEL MODE" light.
master warning light and buzzer come from the ON side of the ignition switch. The control signal for the
master warning light and buzzer is a switched ground on the black wire 7699 that comes from the 6 pin
SEE: MP84.3334 and MP84.9964
Unplug the 6 pin UML connector from the touch panel. If the light and buzzer go out, replace the
touch panel. If the light and buzzer remain on, the 7699 wire is shorted to ground and must be fixed.
UML connector on the touch panel.
If the warning light does not go out,
SEE: MP84.3170
Power for the
MANUAL OPERATION
725 TROUBLE SHOOTING STEPS
unplug the sensing unit from the harness.
the 32 pin connector back into the I/O module.
MASTER RELAY
MP84.3170
8 67 5
D
C
B
A
1
4 3 2
PIN 4
MP84.3334
LINK LIGHT
PUMP RELAY
LINK LIGHT
PIN 1
TRAVEL
DUMP
PIN 1
MP84.3170
MASTER RELAY
PUMP RELAY
B
C
D
5768A 234 1
TRAVEL
DUMP
LINK LIGHT
7699
PIGTAIL PROVIDED - 7699
FUSE HOLDER - 6121
PIGTAIL W/DIODE
+12 VOLT IGNITION "ON" POWER
CONNECT THIS END TO
CONTROL
WARN LIGHT CONTROL BUZZER
5-15 AMP FUSE
DOWN
7699
LIGHT
JACK
6111
6111
IGNITION
+
_
AND IN-LINE INFORMATION
CONNECTION
SEE TOUCH PANEL
BUZZER
7699
MP84.9964
PIN 6 - BLACK - 0300 - SWITCHED GROUND WHEN RIGHT SIDE IS LOW
PIN 5 - BLACK - 0200 - SWITCHED GROUND WHEN FRONT IS LOW
PIN 4 - BLACK - 0100 - SWITCHED GROUND WHEN LEFT SIDE IS LOW
PIN 1 - BLACK - 0400 - SWITCHED GROUND WHEN REAR IS LOW
LED D - RIGHT SIDE OF VEHICLE (PASSENGER SIDE)
MOUNTING / ADJUSTMENT
DIAGRAM - 725 SERIES
SEE ELECTRICAL CONNECTION
LEGEND
SEE WIRE
PIN 3 - RED - 6121 - +12 VOLT FOR SENSING UNIT
PIN 2 - WHITE - 6231 - GROUND FROM SENSING UNIT
LED C - REAR OF VEHICLE
LED B - LEFT SIDE OF VEHICLE (DRIVER SIDE)
LED A - FRONT OF VEHICLE
BOTTOM VIEW OF
WIRE LEGEND
D
SENSING UNIT
C
B
A
SCREWS (3)
YELLOW LEDS
21
453 6
BELOW
MODULE
OUTPUT
INPUT/
MULTIPLEXED
DIAGRAM
CONNECTION
ELECTRICAL
SEE
LEVELING SYSTEM
SINGLE STEP
MP84.3430
MP84.3430
PIN 5 - BLACK - 0200 - SWITCHED GROUND WHEN FRONT IS LOW
PIN 4 - BLACK - 0100 - SWITCHED GROUND WHEN LEFT SIDE IS LOW
PIN 1 - BLACK - 0400 - SWITCHED GROUND WHEN REAR IS LOW
PIN 3 - RED - 6121 - +12 VOLT FOR SENSING UNIT
PIN 2 - WHITE - 6231 - GROUND FROM SENSING UNIT
LED D - RIGHT SIDE OF VEHICLE (PASSENGER SIDE)
LED B - LEFT SIDE OF VEHICLE (DRIVER SIDE)
PIN 6 - BLACK - 0300 - SWITCHED GROUND WHEN RIGHT SIDE IS LOW
LED C - REAR OF VEHICLE
WIRE LEGEND
DIAGRAM - 725 SERIES
SEE ELECTRICAL CONNECTION
SEE WIRE
LED A - FRONT OF VEHICLE
SENSING UNIT
BOTTOM VIEW OF
D
C
A
B
MOUNTING / ADJUSTMENT
SCREWS (3)
YELLOW LEDS
LEVELING SYSTEM
3
6
21
4 5 LEGEND
BELOW
SINGLE STEP
DIAGRAM
MODULE
OUTPUT
MULTIPLEXED
CONNECTION
ELECTRICAL
INPUT/
SEE

MI91.327E
01NOV11
If there is no ground on pin D8 of the harness connector, the problem is the #9000 wire, the wire
SEE: MP84.3130
connection to the 32 pin connector, the connection of the #9000 wire to the park brake switch out put
or something is wrong with the park brake switch.
If there is a ground on pin D8 of the harness connector, make sure the #9000 wire is properly
inserted into the connector. Give the wire a light pull. If the wire is loose in the connector, the pin may
not have good contact with the module pin. Check for any corrosion problems. If the wire and pin are
properly inserted into the 32 pin connector and the pin or socket are not corroded, use a voltmeter to
check voltage between the white and red wire in the 5 pin MTA connector on the back of the touch
panel. If there is less than 10.5 volts at the touch panel,voltage to the I/O module should be
Ground for the I/O module (and touch panel) is a 14 gauge wire coming out of the top of the I/O module,
not the brass ground stud on the module. If voltage to the module is low, check all ground connections
and the voltage source. If voltage to the module is good but there is low voltage coming from the
module to the touch panel, make sure all connections for the red 6800 wire on pin B1 and white 6230
wire on pin B3 are good. If all wires and connections are good, replace the I/O module.
at the touch panel is good, replace the I/O module. SEE: MP84.3170 and MP84.3334
2. With the park brake released, the "NOT IN PARK/BRAKE" light does not come on when a
DOWN arrow is pushed. Push any UP arrow. If the "NOT IN PARK/BRAKE" light is not coming
on, the pump should run.
IF THE PUMP RUNS with the park brake released, either the #9000 park brake wire has a ground
on it or the I/O module is bad.
Unplug the 32 pin connector at the I/O module. The black #9000 park brake wire is on pin D8. Make
sure the park brake is released. Use a test light connected to a +12 source such as the battery supply
side of the master relay to check pin D8 for a ground. SEE: MP84.3170 and MP84.3130
If there is a ground on pin D8, the #9000 park brake wire is shorted to ground,
improperly connected or there is a problem with the park brake switch.
there is a problem with the I/O module and it should be replaced.
If there is no ground on pin D8 of the harness connector,
checked. Ign./Acc. voltage to the I/O module is on pin D1 in the 32 pin connector at the I/O module.
If voltage
connected to a +12 source such as the battery supply side of the master relay to check pin D8 for a
32 pin connector at the I/O module. The black #9000 park brake wire is on pin D8. Use a test light
There should be a ground on the park brake wire (9000) with the park brake set. Unplug the
1. With the park brake set, the "NOT IN PARK/BRAKE" light comes on while pushing a DOWN
and push any DOWN arrow on the touch panel. The "NOT IN PARK/BRAKE" light should come on.
The "NOT IN PARK/BRAKE" light should not come on. Release the park brake
A. With the ignition in the ON or ACC. position and the park brake set, push any DOWN arrow
THE VEHICLE CAN ROLL FORWARD OR BACKWARD CAUSING INJURY OR DEATH.
CHOCK THE VEHICLE WHEELS BEFORE RELEASING THE PARK BRAKE.
It is also important that the park brake circuit is functioning properly and that the system
The system will not function if the park brake is not set.
SEE: MP84.3170
Reset the park brake.
on the touch panel.
arrow.
ground.
WARNING:
cannot function with the park brake released.
PART 5. PARK BRAKE CHECK.
MANUAL OPERATION
725 TROUBLE SHOOTING STEPS
NOTE: Contact the vehicle manufacturer for information concerning the park brake switch
or the connection of the HWH 9000 wire to the park brake switch.
MP84.3170
8 67 5
B
A
D
C
14 3 2
PUMP RELAY
MASTER RELAY
LINK LIGHT
DUMP
TRAVEL
MP84.3170
MASTER RELAY
8 67 5 A
B
C
D
1432
PUMP RELAY
LINK LIGHT
TRAVEL
DUMP
MP84.3334
PIN 4
LINK LIGHT
PIN 1
PIN 1
MP84.3170
MASTER RELAY
5768A
C
D
B
2341
LINK LIGHT
PUMP RELAY
TRAVEL
DUMP
WARNING
DIAGRAM- SENSING UNIT
SWITCH
SEEELECTRICAL CONNECTION DIAGRAM
LEVELINGSYSTEM HYDRAULIC MANIFOLD
SEEELECTRICAL CONNECTION
RESISTOR
PRESSURE SWITCH
MULTIPLEXEDINPUT/OUTPUT MODULE
SEEELECTRICAL CONNECTION DIAGRAM
TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES
PARK BRAKE - MASTER WARNING LIGHT AND BUZZER
725 SERIES SINGLE STEP LEVELING SYSTEM
ELECTRICAL CONNECTION DIAGRAM
DONOT CUT
TERMINATING
9001 - TO
DIODE PARK BRAKE
LIGHT
PRESSURE SWITCH
NOTE:DIODE ARRANGEMENT MAY NOT BE
4000
AB
4200
6235
PRESENTON ALL INSTALLATIONS
6120 - TO +12V ACC.
LR WARNING
SWITCH
15AMP
FUSE
WARNING
BUZZER
6111
12V IGNITION
CONNECT TO
SWITCH
9000
1000
DIODE
6111
SWITCH
PARK BRAKE
7699
WARNING
MASTER
LIGHT
+
7699
1200
FUSE
5AMP
LF SWITCH
PRESSURE
AB
6235
TOUCH PANEL
UNDERSTANDOPERATOR’SMANUALBEFOREUSING. BLOCK FRAME AND TIRES
SECURELYBEFOREREMOVINGTIRESOR CRAWLING UNDER VEHICLE.
HWHCOMPUTERIZED LEVELING
MANUAL
DONOT CUT
LEVEL
AUTO
AUTO
STORE
_
EXTEND
EXCESS
SLOPE
PARK/
NOTIN
R
RETRACT
TRAVEL
MODE
WARNING!
CANCEL
BRAKE
RESISTOR
TERMINATING
EXTEND
RETRACT
6235
3000
AB
3200 MP84.3130
08JUN11
SWITCH
WARNING RR
8101
8100
6235
PUMPAND MASTER RELAYS
2200
PRESSURE
SWITCH
2000
AB
RF
MP84.3130
MP84.3130
ELECTRICAL CONNECTION DIAGRAM
725 SERIES SINGLE STEP LEVELING SYSTEM
PARK BRAKE - MASTER WARNING LIGHT AND BUZZER
TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES
SEEELECTRICAL CONNECTION DIAGRAM
MULTIPLEXEDINPUT/OUTPUT MODULE
PRESSURE SWITCH
RESISTOR
SEEELECTRICAL CONNECTION
LEVELINGSYSTEM HYDRAULIC MANIFOLD
SEEELECTRICAL CONNECTION DIAGRAM
SWITCH
DIAGRAM- SENSING UNIT
WARNING
DIODE 9001 - TO
TERMINATING
DONOT CUT
NOTE:DIODE ARRANGEMENT MAY NOT BE
PRESSURE SWITCH
LIGHT
PARK BRAKE
4000
4200
B A
6235
6120 - TO +12V ACC.
PRESENTON ALL INSTALLATIONS
LR SWITCH
WARNING
FUSE
15AMP
9000
SWITCH
CONNECT TO
12V IGNITION
6111
BUZZER
WARNING
1000
7699
PARK BRAKE
SWITCH
6111
DIODE
WARNING
LIGHT
MASTER
+
7699
5AMP
FUSE
1200
LF PRESSURE
SWITCH
B A
6235
MANUAL
HWHCOMPUTERIZED LEVELING
SECURELYBEFOREREMOVINGTIRESOR CRAWLING UNDER VEHICLE.
UNDERSTANDOPERATOR’SMANUALBEFOREUSING. BLOCK FRAME AND TIRES
TOUCH PANEL
DONOT CUT
STORE
AUTO
AUTO
LEVEL
_
BRAKE
CANCELWARNING!
MODE
TRAVEL
RETRACT
R
NOTIN
PARK/
SLOPE
EXCESS
EXTEND
TERMINATING
RESISTOR
RETRACT
EXTEND
6235
3000
3200
B A
08JUN11
MP84.3130
WARNING
SWITCH RR
8101
8100
6235
PUMPAND MASTER RELAYS
2200
SWITCH
PRESSURE
2000
B A
RF

MI91.327F
01NOV11
PART 5. SECTION A.2. CONTINUED
If voltage at the touch panel is good, unplug the 32 pin harness connector at the I/O module.
Check and record the voltage between pin D1 of the 32 pin harness connector and the brass
ground stud on the top of the I/O module. Plug the 32 pin connector back in. Disconnect the
#9000 park brake wire from the park brake switch connection. Make sure there is no ground
on the #9000 park brake wire. Check the voltage between the #9000 wire, pin D8 of the 32 pin
Strip some insulation from the wire close to the connector. Make sure to repair the wire with
some type of sealant when the test is finished. The voltage should be within less than 1 volt
of the voltage you recorded on pin D1 of the harness connector. If there is a difference in the
voltage greater than 1 volt, the I/O module needs to be replaced. If the voltage is good, the
problem is the I/O module or touch panel. Replace the touch panel first. If the problem
remains, reinstall the original touch panel and replace the I/O module.
SEE: MP84.3170
PART 6. FOR VEHICLES EQUIPPED WITH AIR SUSPENSION
The two types of suspension air dump, pilot air dump or HWH air dump valves, are explained in the
SYSTEM OPERATION and GLOSSARY sections of this manual. The ignition must be in the "ON" or
"ACC" position and the park brake must be set for the air dump system to function. The vehicle
should be at ride height with all air bags full of air when checking air dump.
A. PILOT AIR DUMP: The air should start to dump when the "dump" button is pushed and
continue to dump when the "dump" button is released. If the ignition is on and the "store"
button is pushed or the park brake is released, the vehicle should return to ride height if
there is ample air in the suspension air tanks.
If both link lights are flashing, the next step is checking voltage.
check voltage between the white and red wire in the 5 pin MTA connector on the back of
voltage to the I/O
module should be checked. Ign./Acc. voltage to the I/O module is on pin D1 in the 32 pin
connector at the I/O module. Ground for the I/O module (and touch panel) is a 14 gauge
wire coming out of the top of the I/O module, not the brass ground stud on the module. If
voltage to the module is low, check all ground connections and the voltage source. If voltage
to the module is good but there is low voltage coming from the module to the touch panel, make
sure all connections for the red 6800 wire on pin B1 and white 6230 wire on pin B3 are good. If
when pushing an up arrow with the park brake released,
set the park brake and push any UP arrow. If the pump runs with the park brake set, the
problem is the touch panel. If the pump does not run with the park brake set, the problem
is the touch panel, the I/O module, a communication problem or a voltage issue.
Check the link light on the back of the touch panel and on the I/O module.
Both lights should be flashing. If either light is off or on steady, go to PART 1,
"TOUCH PANEL TO I/O MODULE COMMUNICATION CHECK".
If there is less than 10.5 volts at the touch panel,
Use a voltmeter to
SEE: MP84.3334 and MP84.3170
MANUAL OPERATION
725 TROUBLE SHOOTING STEPS
MANUAL SYSTEM OPERATION
IF THE PUMP DOES NOT RUN
MP84.3334
PIN 4
MP84.3170
PIN 1
LINK LIGHT
PIN 1
LINK LIGHT
MASTER RELAY
PUMP RELAY
5768A
B
C
D
234 1
DUMP
TRAVEL
the touch panel.
all wires and connections are good, replace the I/O module. SEE: MP84.3334 and MP84.3170 MP84.3170
LINK LIGHT
MASTER RELAY
PUMP RELAY
5768A
B
C
D
234 1
DUMP
TRAVEL
GROUND STUD
connector, (close to the I/O module) and the brass ground stud on the top of the I/O module.

MI91.327G
01NOV11
PART 6. SECTION A. CONTINUED
2. THE SYSTEM STARTS TO DUMP AIR FROM THE SUSPENSION BUT STOPS DUMPING AIR
WHEN THE "DUMP" BUTTON IS RELEASED. Make sure the vehicle has a pilot air dump system and
not a dump system that uses HWH air dump valves. Check the travel LED on the I/O module. If it is on
after releasing the DUMP button, replace the I/O module. If the travel LED is not on, there is an issue
with the air dump equipment. Contact the vehicle manufacturer. SEE: MP84.3170
3. THE VEHICLE SUSPENSION WILL NOT RETURN TO RIDE HEIGHT WHEN THE "STORE"
BUTTON IS PUSHED AND THE IGNITION IS ON. Make sure the suspension air tanks are full. Push
any UP arrow. The pump should start to run. If the pump does not run, proceed to PART 7 Section B
If the pump runs, communication between the touch panel and the I/O module is ok, the master relay is
on and there is output voltage to the I/O module. Check the travel LED on the I/O module, it should be
on. The dump LED should be off. SEE: MP84.3170
The TRAVEL LED is on. Unplug the 3 pin Packard connector at the I/O module and check for voltage
between the white ground wire in pin A and the 9301 dump wire in pin C. If there is no voltage, make
sure the wire to pin connections for both wires are ok. Fix if necessary. If the connections are ok,
replace the I/O board. If there is voltage between the white wire and the 9301 wire, plug the connector
back in and locate the 4 pin UML connector and check for voltage between the white wire in pin 3 and
the 9301 dump wire in pin 2.
out while pushing the DUMP button or will still not dump air, the problem is the chassis harness or the
back in and check the dump LED while pushing the DUMP button. If the LED does not come on, goes
Packard connector and the 4 pin UML connector. If the LED stays on, plug the 4 pin UML connector
is off or goes out, there is a short to ground on the 9300 dump wire in the harness between the 3 pin
3 pin Packard connector back in. Check the dump LED while pushing the DUMP button. If the LED
but could be the touch panel. If the LED is now on, find the 4 pin UML plug and unplug it. Plug the
LED while pushing the DUMP button. If the LED is still off, the problem is most likely the I/O module
about 10 - 15 seconds and plug the 32 pin connector back in. Turn the ignition on. Check the dump
the I/O module. Turn the ignition off. Unplug the 32 pin harness connector at the I/O module. Wait
The DUMP LED is not on while pushing the DUMP button.
voltage at the 4 pin UML connector, the problem is with the connections or harness wires between the
in, the problem is with the suspension dump equipment, contact the vehicle manufacturer. If there is no
pin 1. If there is good voltage (10 volt or more) at the 4 pin UML connector, with the connector plugged
4 pin UML connector and check for voltage between the white wire in pin 3 and the 9300 dump wire in
If there is voltage between the white wire and the 9300 wire, plug the connector back in and locate the
connections for both wires are ok. Fix if necessary. If the connections are ok, replace the I/O board.
wire in pin A and the 9300 dump wire in pin B. If there is no voltage, make sure the wire to pin
Unplug the 3 pin Packard connector at the I/O module and check for voltage between the white ground
The DUMP LED is on while pushing the DUMP button, air will not dump from the suspension.
to the I/O module. Check the red LED for dump on the I/O module while the "DUMP" button is being
between the touch panel and the I/O module is ok, the master relay is on and there is output voltage
to run. If the pump does not run, proceed to PART 7 Section B. If the pump runs, communication
Make sure the ignition is on and the park brake is set. Push any UP arrow. The pump should start
1. THE AIR DOES NOT START TO DUMP WHEN THE "DUMP" BUTTON IS PUSHED.
3 pin Packard connector and the 4 pin UML connector.
pilot dump valve. Contact the vehicle manufacturer for assistance. SEE: MP84.3135 and MP84.3245
pushed. This LED should be on. SEE: MP84.3170
Unplug the 3 pin Packard connector at
SEE: MP84.3170 and MP84.3135
725 TROUBLE SHOOTING STEPS
MANUAL SYSTEM OPERATION
SEE: MP84.3135 and MP84.3245
MP84.3170
LINK LIGHT
MASTER RELAY
PUMP RELAY DUMP
TRAVEL
TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES
PARK BRAKE - MASTER WARNING LIGHT AND BUZZER
725 SERIES SINGLE STEP LEVELING SYSTEM
ELECTRICAL CONNECTION DIAGRAM
FUSE
15 AMP
MANUAL
HWHCOMPUTERIZED LEVELING
SECURELYBEFOREREMOVINGTIRESOR CRAWLING UNDER VEHICLE.
UNDERSTANDOPERATOR’SMANUALBEFOREUSING. BLOCK FRAME AND TIRES
TOUCH PANEL
7699 7699
PARK BRAKE
DIODE
NOTE: DIODE ARRANGEMENT MAY NOT BE
PRESENT ON ALL INSTALLATIONS
LR
BY O.E.M.
CONNECTION
PILOT DUMP
SWITCH
PRESSURE SWITCH
4200
SWITCH
WARNING
4000
B A
6235
TO +12V ACC.
PARK BRAKE
LIGHT
9001 - TO
9000
9301 TRAVEL
9300 DUMP
6230 GND
6111
LIGHT
DIODE
WARNING
MASTER
LF
SWITCH
12V IGNITION
CONNECT TO
_
+
6111
BUZZER
1000
FUSE
5AMP
1200
B A
6235
BRAKE
CANCEL
STORE
AUTO
DO NOT CUT
WARNING!
DUMP
MANUAL
MODE
TRAVEL
RETRACT
AUTO
LEVEL
R
NOTIN
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
06JUN11
MP84.3135
RR
8100
8101
PUMP AND MASTER RELAYS
SEE ELECTRICAL CONNECTION
W/PILOT AIR DUMP
LEVELING SYSTEM HYDRAULIC MANIFOLD
SEE ELECTRICAL CONNECTION DIAGRAM
SWITCH
DIAGRAM - SENSING UNIT
TERMINATING
RESISTOR
RETRACT
EXTEND
CONNECTION
PILOT AIR DUMP
9301
9300
6230
B
CA
6235
2000
2200
B A
WARNING
SWITCH
PRESSURE RF
MP84.3135
SWITCH
PRESSURE
50 LB
PUMP AND MASTER RELAYS
LEVELING SYSTEM HYDRAULIC MANIFOLD W/PILOT AIR DUMP
ELECTRICAL CONNECTION DIAGRAM
#4
MULTIPLEX I/O MODULE
DETAIL (A) - TOP VIEW
6230 (RELAY GND)
RELAY (A)
MASTER
+12 VOLT
BATTERY
TO
#9
+
CONTROL
MASTER RELAY
8500 (BLACK)
#1
#3
#2
MOTOR
PUMP
6230 (RELAY GND)
40 AMP
FUSE
6800
LR
AB
SWITCH
PRESSURE
3000 LB
8100
TO GROUND STUD
ON PUMP (6230)
6230
6230
4400
ABA
6230
2400
1400
BAB
6230
3400
AB
P.E.DP.E.D
LR
P.E.D P.E.D
RR
SYSTEM - PILOT AIR DUMP
SINGLE STEP LEVELING
DIAGRAM - 725 SERIES
SEE ELECTRICAL CONNECTION
CONTROL
PUMP
RELAY (B)
#7
#8
#5
#6 GROUND STUD
SIDE VIEW
POWER UNIT
8600 - (BLACK)
PUMP RELAY
HARNESS
TOUCH PANEL
TRAVEL 9301
DUMP 9300
GND 6231
RRLF RF
B A ABBA
07JUN11
MP84.3245
MULTIPLEX
SEE DETAIL (A)
I/O MODULE
A
B
C
DEUTSCH CONNECTOR
GROUND STUD IN MANIFOLD
SHOWN HERE BENEATH THE
RELAY (A)
SEE DETAIL (A)
LF
RF
MASTER
MOTOR
PUMP
MULTIPLEX I/O MODULE
8101
RELAY (B)
TOP VIEW
POWER UNIT
PUMP
MP84.3245
MP84.3170
PUMP RELAY
MASTER RELAY
LINK LIGHT
TRAVEL
DUMP
MP84.3245
SEE DETAIL (A)
MULTIPLEX I/O MODULE
ELECTRICAL CONNECTION DIAGRAM
PUMP AND MASTER RELAYS
LEVELING SYSTEM HYDRAULIC MANIFOLD W/PILOT AIR DUMP
TOUCH PANEL
HARNESS
GND 6231
DUMP 9300
TRAVEL 9301
PUMP RELAY
8600 - (BLACK)
CONTROL
MULTIPLEX I/O MODULE
+
#9
6230 (RELAY GND)
MASTER
RELAY (A)
#4
BATTERY
TO
+12 VOLT
CONTROL
#3
#1
#2
DETAIL (A) - TOP VIEW
6230 (RELAY GND)
MASTER RELAY
8500 (BLACK)
FUSE
40 AMP
PUMP
MOTOR
RELAY (B)
#8
PUMP
#5
#7
#6
6800
B A
LR RR
BB A B
LF
A
RF
A
TO GROUND STUD
ON PUMP (6230)
4400
6230
AB
3400
6230
AB
6230
2400
1400
6230
ABBA
3000 LB
PRESSURE
SWITCH 8100
P.E.D
LR
P.E.DP.E.D P.E.D
RR
LF
RF
50 LB
PRESSURE
SWITCH
8101
SIDE VIEW
POWER UNIT
GROUND STUD
07JUN11
MP84.3245
SEE ELECTRICAL CONNECTION
DIAGRAM - 725 SERIES
SINGLE STEP LEVELING
SYSTEM - PILOT AIR DUMP
I/O MODULE
SEE DETAIL (A)
MULTIPLEX
CA
B
RELAY (A)
SHOWN HERE BENEATH THE
GROUND STUD IN MANIFOLD
DEUTSCH CONNECTOR
MASTER
PUMP
MOTOR
RELAY (B)
TOP VIEW
POWER UNIT
PUMP
MP84.3135
TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES
PARK BRAKE - MASTER WARNING LIGHT AND BUZZER
ELECTRICAL CONNECTION DIAGRAM
725 SERIES SINGLE STEP LEVELING SYSTEM
TERMINATING
SEE ELECTRICAL CONNECTION DIAGRAM
MULTIPLEXED INPUT/OUTPUT MODULE
PRESSURE SWITCH
LEVELING SYSTEM HYDRAULIC MANIFOLD
SEE ELECTRICAL CONNECTION DIAGRAM
SEE ELECTRICAL CONNECTION
DIAGRAM - SENSING UNIT
WARNING
9000
TO +12V ACC.
9301 TRAVEL
PRESSURE SWITCH
PARK BRAKE
9001 - TO
LIGHT
LR
4200
SWITCH
WARNING
4000
AB
6235
PARK BRAKE
NOTE: DIODE ARRANGEMENT MAY NOT BE
PRESENT ON ALL INSTALLATIONS
DIODE
CONNECTION
PILOT DUMP
BY O.E.M.
SWITCH
6230 GND
9300 DUMP
15 AMP
FUSE
DO NOT CUT
12V IGNITION
CONNECT TO
_
WARNING
SWITCH
6111
LIGHT
7699
DIODE
MASTER
WARNING BUZZER
7699
6111
+
1000
AB
FUSE
5AMP
1200
6235
LF SWITCH
PRESSURE
HWHCOMPUTERIZED LEVELING
TOUCH PANEL
SECURELYBEFOREREMOVINGTIRESOR CRAWLING UNDER VEHICLE.
UNDERSTANDOPERATOR’SMANUALBEFOREUSING. BLOCK FRAME AND TIRES
MANUAL
STORE
MODE
WARNING!
TRAVEL
DUMP
CANCEL
RETRACT
DO NOT CUT
AUTO
LEVEL
AUTO
SLOPE
PARK/
BRAKE
NOTIN
EXCESS
MANUAL
EXTEND
R
RETRACT
RESISTOR
TERMINATING
EXTEND
3200
SWITCH
WARNING
6235
3000
AB
MP84.3135
06JUN11
RR
RESISTOR
8100
8101
W/PILOT AIR DUMP
PUMP AND MASTER RELAYS
CONNECTION
PILOT AIR DUMP
BA
6230
9300
C
9301
6235
2000
AB
2200
SWITCH
PRESSURE
SWITCH
RF

MI91.327H
01NOV11
PART 6. SECTION A.3 CONTINUED
B.
SEE: MP84.3170
WARNING:
HWH AIR DUMP VALVES: This section is for systems that incorporate hwh normally closed
air dump valves to provide a suspension air dump system. When the "dump" button is pushed,
air should exhaust from the vehicle suspension. If the "dump" button is released, the air will
stop exhausting from the suspension. If there is adequate air in the suspension air tanks, the
vehicle will start to return to ride height. Vehicles with hwh air dump valves can go to ride
DO NOT CRAWL UNDER THE VEHICLE UNLESS THE FRAME OF THE VEHICLE
IS PROPERLY SUPPORTED. THE VEHICLE WILL DROP RAPIDLY WHEN AIR IS RELEASED FROM
THE SUSPENSION CAUSING SEVERE INJURY OR DEATH.
1. WHILE PUSHING THE "DUMP" BUTTON, THE AIR WILL DUMP FROM AT LEAST ONE VALVE
BUT NOT ALL OF THE DUMP VALVES. Locate the HWH air dump valves that are not working. Make
HWH dump valves from the I/O board. If not all of the valves are dumping air, there is a problem with
the wiring harness to the valve(s) not working or a problem with the valve(s). Check for voltage to the
valve(s) not working. If there is good voltage between the white and black wire in the harness to the
2. THE AIR DOES NOT START TO DUMP WHEN THE "DUMP" BUTTON IS PUSHED.
UP arrow. The pump should start to run. If the pump does not run, proceed to PART 7 Section B.
If the pump runs, communication between the touch panel and the I/O module is ok, the master relay
is on and there is output voltage to the I/O module. Check the red LED for dump on the I/O module
while the "DUMP" button is being pushed. This LED should be on.
sure the exhaust port of the valve is not plugged with dirt or debris. There is only one output for all the
valve, replace the valve. If there is no voltage to the valve, the problem is in the harness.
height anytime there is air in the suspension air tanks.
Push any
section. If the travel LED is not on, replace the touch panel.
repair manual.) Check the travel LED on the I/O module. If the LED is on, review PART 3 of this
arrow. If the "NOT IN PARK/BRAKE" light does not come on, review
DOWN arrow. Make sure the "NOT IN PARK/BRAKE" touch panel light is on while pushing a DOWN
THE VEHICLE WHEELS SO THE VEHICLE CANNOT ROLL.
Make sure the suspension air tanks are full.
4. THE VEHICLE SUSPENSION WILL NOT RETURN TO RIDE HEIGHT WHEN THE PARK BRAKE
or the pilot dump valve. Contact the vehicle manufacturer for assistance.
connector back in and check the travel LED. If the LED goes out, the problem is the chassis harness
the 3 pin Packard connector and the 4 pin UML connector. If the LED stays on, plug the 4 pin UML
If the LED is off or goes out, there is a short to ground on the 9301 travel wire in the harness between
find the 4 pin UML plug and unplug it. Plug the 3 pin Packard connector back in. Check the travel LED.
pushing the STORE button. If the LED is still off, replace the I/O module. If the travel LED is now on,
10 - 15 seconds and plug the 32 pin connector back in. Turn the ignition on. Check the travel LED after
module. Turn the ignition off. Unplug the 32 pin harness connector at the I/O module. Wait about
If the light does flash after pushing the STORE button, unplug the 3 pin Packard connector at the I/O
button should flash after the STORE button is pushed. If the light does not flash, replace the touch panel.
The TRAVEL LED is not on after pushing the STORE button.
between the 3 pin Packard connector and the 4 pin UML connector.
If there is no voltage at the 4 pin UML connector, the problem is with the connections or harness wires
the problem is with the suspension dump equipment, contact the vehicle manufacturer.
If there is good voltage (10 volt or more) at the 4 pin UML connector, with the connector plugged in,
IS RELEASED AND THE IGNITION IS ON.
SEE: MP84.3135
The STORE light above the STORE
SEE: MP84.3170 and MP84.3135
PART 5 Section A2
Release the park brake. (Push any
CHOCK
of this
SEE: MP84.3135
MANUAL SYSTEM OPERATION
725 TROUBLE SHOOTING STEPS
MP84.3135
WARNING
DIAGRAM - SENSING UNIT
SEE ELECTRICAL CONNECTION DIAGRAM
LEVELING SYSTEM HYDRAULIC MANIFOLD
SEE ELECTRICAL CONNECTION
TERMINATING
PRESSURE SWITCH
MULTIPLEXED INPUT/OUTPUT MODULE
SEE ELECTRICAL CONNECTION DIAGRAM
ELECTRICAL CONNECTION DIAGRAM
725 SERIES SINGLE STEP LEVELING SYSTEM
PARK BRAKE - MASTER WARNING LIGHT AND BUZZER
TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES
9301 TRAVEL
9000
9001 - TO
LIGHT
PARK BRAKE
TO +12V ACC.
PRESSURE SWITCH
LR
4200 4000
WARNING
SWITCH
AB
6235
PRESENT ON ALL INSTALLATIONS
NOTE: DIODE ARRANGEMENT MAY NOT BE
DIODE
PARK BRAKE
PILOT DUMP
CONNECTION
BY O.E.M.
SWITCH
6230 GND
9300 DUMP
15 AMP
FUSE
DO NOT CUT
WARNING
_
CONNECT TO
12V IGNITION
SWITCH
6111
LIGHT
DIODE
7699
MASTER
WARNING BUZZER
+
6111
7699
1000
AB
1200
5AMP
FUSE
6235
LF SWITCH
PRESSURE
TOUCH PANEL
UNDERSTANDOPERATOR’SMANUALBEFOREUSING. BLOCK FRAME AND TIRES
SECURELYBEFOREREMOVINGTIRESOR CRAWLING UNDER VEHICLE.
HWHCOMPUTERIZED LEVELING
MANUAL
STORE RETRACT
TRAVEL
MODE
DUMP
WARNING!
DO NOT CUT
CANCEL
LEVEL
AUTO
AUTO
EXTEND
EXCESS
SLOPE
PARK/
NOTIN
R
MANUAL
BRAKE
RETRACT
RESISTOR
TERMINATING
EXTEND
3200
6235
SWITCH
WARNING
3000
AB
MP84.3135
06JUN11
RR
RESISTOR
8100
8101
W/PILOT AIR DUMP
PUMP AND MASTER RELAYS
PILOT AIR DUMP
CONNECTION
A
CB
6230
9300
9301
6235
2000
AB
2200
PRESSURE
SWITCH
SWITCH
RF
MP84.3170
PUMP RELAY
MASTER RELAY
LINK LIGHT
8 67 5
D
C
B
A
1
4 3 2
TRAVEL
DUMP
14328675
MP84.3170
D
C
B
A
PUMP RELAY
MASTER RELAY
LINK LIGHT
TRAVEL
DUMP

MI91.327I
01NOV11
PART 7. MANUAL OPERATION OF THE JACKS.
the ignition is on and the park brake is set. Each set of UP and DOWN arrows on the manual side of
the touch panel control two jacks; both front, both rear, the left front and left rear or the right front
and the right rear. The UP arrows extend the jacks and lift the vehicle. The DOWN arrows retract the
jacks and lower the vehicle. The pump should only run when an UP arrow is pushed. When a jack
extends between 1/2 inch and 1 inch, the red warning light for that jack will come on and the
"TRAVEL MODE" light will go out. If the ignition is in the ON position, the master "JACKS DOWN"
warning light and the warning buzzer will also come on. Some systems are wired so the master
warning light will come on if the ignition is in the ACC. position but the buzzer will come on only
if the ignition is in the ON position.
all the dump valves must be stuck open and need to be replaced.
+12 volts is shorted to the 9300 dump wire in the harness. Correct this problem.
If the LED goes out with the 3 pin Packard connector
unplug the touch panel. If the LED goes out with the touch panel unplugged, replace the touch panel.
unplug the 3 pin Packard connector at the I/O module.
If the LED is off,
unplugged,
If the LED remains on, replace the I/O module.
If the LED is on, If the LED stays on,
SECTION B.3. CONTINUEDPART 6.
The DUMP LED is not on while pushing the DUMP button.
the I/O module. Turn the ignition off. Unplug the 32 pin harness connector at the I/O module. Wait
about 10 - 15 seconds and plug the 32 pin connector back in. Turn the ignition on. Check the dump
3. THE VEHICLE WILL NOT RETURN TO RIDE HEIGHT.
there is adequate air in the suspension air tanks. Any time the suspension air tanks are full the vehicle
should return to ride height. There should be no air coming from the HWH air dump valves. If there is
the vehicle manufacturer for assistance. If only one valve is exhausting air, replace the valve. If all the
valves are exhausting air, check the dump LED on the I/O module.
no air exhausting from the HWH dump valves, there is a problem with the vehicle suspension. Contact
The DUMP LED is on while pushing the DUMP button, air will not dump from the suspension.
Unplug the 3 pin Packard connector at the I/O module and check for voltage between the white ground
wire in pin A and the 9300 dump wire in pin B. If there is no voltage, make sure the wire to the pin
connections for both wires are ok. Fix if necessary. If the connections are ok, replace the I/O board.
If there is voltage between the white wire and the 9300 wire, plug the connector back in and locate
the HWH air dump valves. Check for voltage between the white wire and the 9300 dump wire at the
dump valve. If there is good voltage (10 volt or more) at the 4 pin UML connector, with the connector
plugged in, the problem is with the suspension dump equipment, contact the vehicle manufacturer.
If there is no voltage at the 4 pin UML connector, the problem is with the connections or harness wires
between the 3 pin Packard connector and the 4 pin UML connector.
SEE: MP84.3135 and MP84.3170
SEE: MP843135
Start the vehicle engine and make sure
Unplug the 3 pin Packard connector at
MANUAL SYSTEM OPERATION
725 TROUBLE SHOOTING STEPS
LED while pushing the DUMP button. If the LED is still off, the problem is most likely the I/O module
but could be the touch panel. If the LED is now on, there is a short in the harness to the HWH dump
valves or one or more HWH air dump valves are bad. Locate and unplug all HWH air dump valves.
Plug the 3 pin Packard connector back in. Check the dump LED while pushing the DUMP button. If
the LED is off or goes out, there is a short to ground on the 9300 dump wire in the harness between
the 3 pin Packard connector and the HWH air dump valves. If the LED stays on, one or more of the
HWH valves is bad. Plug one valve at a time back in. Check the dump LED while pushing the DUMP
button. If the dump LED stays on, the valve is good. If the light does not come on or goes out, replace
the valve. If the dump LED goes out while checking a valve, unplug the bad valve, turn the ignition
off, and wait about a half minute before turning the ignition on and testing another valve.
SEE: MP84.3170
The jacks can be manually operated when
MP84.3170
8 4675 132 A
D
C
B
61116111
DO NOT CUT
TERMINATING
PUMP RELAY
LINK LIGHT
MASTER RELAY
DUMP
TRAVEL
MP84.3135
6230 GND
9300 DUMP
PRESENT ON ALL INSTALLATIONS
NOTE: DIODE ARRANGEMENT MAY NOT BE
WARNING
SWITCH
4000
9301 TRAVEL
PRESSURE SWITCH
4200
LR
AB
PILOT DUMP
CONNECTION
BY O.E.M.
DIODE
PARK BRAKE
7699
SWITCH
6235
PARK BRAKE
TO +12V ACC.
9000
9001 - TO
LIGHT
7699
15 AMP
FUSE
RR
MP84.3135
06JUN11
MULTIPLEXED INPUT/OUTPUT MODULE
SEE ELECTRICAL CONNECTION DIAGRAM
SWITCH
WARNING
3000
PRESSURE SWITCH
3200
6235
AB
DO NOT CUT
RESISTOR
TERMINATING
8100
8101
ELECTRICAL CONNECTION DIAGRAM
725 SERIES SINGLE STEP LEVELING SYSTEM
PARK BRAKE - MASTER WARNING LIGHT AND BUZZER
TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES
PRESSURE
1000
SWITCH
LIGHT
MASTER
WARNING
DIODE
5AMP
FUSE
AB
1200
LF
BUZZER
+
_
WARNING
CONNECT TO
12V IGNITION
SWITCH
6235
EXCESS
UNDERSTANDOPERATOR’SMANUALBEFOREUSING. BLOCK FRAME AND TIRES
SECURELYBEFOREREMOVINGTIRESOR CRAWLING UNDER VEHICLE.
RETRACT
TRAVEL
MODE
DUMP
WARNING!
CANCEL
EXTEND
SLOPE
PARK/
NOTIN
MANUAL
BRAKE
STORE
LEVEL
AUTO
AUTO RETRACT
EXTEND
MANUAL
RESISTOR
TOUCH PANEL
HWHCOMPUTERIZED LEVELING
R
RF
SEE ELECTRICAL CONNECTION DIAGRAM
LEVELING SYSTEM HYDRAULIC MANIFOLD
2000
PILOT AIR DUMP
W/PILOT AIR DUMP
PUMP AND MASTER RELAYS
DIAGRAM - SENSING UNIT
SEE ELECTRICAL CONNECTION
CONNECTION
SWITCH
WARNING
6230
9300
9301
A
CB
2200
AB
6235
PRESSURE
SWITCH

MI91.327J
01NOV11
PART 7. CONTINUED
SEE: MP84.3240 and MP84.3520
2. The master relay LED is on but the pump LED is not on while pushing an UP arrow.
test light or volt meter to check terminals 1, 2 and 3 of the master relay for +12 volts. Terminal 4 of
the master relay must be a good ground and should be the grounding point for your test light or meter.
Make sure relay connections are clean, free of corrosion and tight. Corrosion in the connection can
be present even though the connection "looks" good.
Use a
Turn the ignition off and remove the 8500 wire from the master relay. Check the 8500 wire for a short
to ground. The wire is only about a foot long. Fix if necessary. Make sure the 8500 wire ring terminal
is isolated from ground. Turn the ignition back on. If the master relay LED does not come on, replace
the I/O module. If the LED does come on, turn the ignition off and reattach the 8500 wire to the master
relay. Turn the ignition on. If the master relay LED does not come on or goes out after a short period of
time, replace the master relay. Retry any UP arrow. If the pump now runs, continue testing the system
according to PART 7. If the pump still does not run, check the pump LED while pushing an UP arrow.
If the pump LED is not on, proceed to SECTION B.2. If the pump LED is on and the pump will not run,
proceed to SECTION B.3.
THE PUMP WILL NOT RUN WHEN ANY UP ARROW BUTTON IS PUSHED. THE "NOT IN
NOTE: The master relay should be on anytime the ignition is on even if the park brake is not set.
The ignition must be on (or in ACC.) with the park brake set for the pump relay to function.
The pump should run and the appropriate jacks should extend. The
red warning lights for the jacks should come on. Extend the jacks far enough to lift the vehicle.
down warning lights on the touch panel should go out. Repeat this with all sets of UP and DOWN arrows.
If the jacks will not retract during the test, proceed to PART 7b.
PARK/BRAKE" LIGHT ON THE TOUCH PANEL IS COMING ON WHILE THE UP ARROW BUTTON
Check that the vehicle ignition is on and the park brake is set.
If the park brake is set, check that the #9000 wire is properly connected to the vehicle park brake
Consult the vehicle manufacturer for park brake wiring information. The
#9000 wire should have a ground when the park brake is set. With the park brake set, unplug the
32 pin connector at the I/O module and check pin D8 in the harness plug.
If a ground is not present,
the #9000 wire, the #9000 wire, the connection for the #9000 wire to the park brake circuit or
THE PUMP WILL NOT RUN WHEN ANY UP ARROW BUTTON IS PUSHED. THE "NOT IN
Make sure the ignition is on and the park brake is set. There
are red LEDs on the I/O module for the master and pump relays. The master relay LED should be on any
time the ignition is on. Both LEDs should be on when an UP arrow button is pushed.
There must be power and ground to the touch panel and the
I/O module along with proper communication between the two. If you are following the repair steps in
order, this has been checked. If not, make sure the ignition is in the ON or ACC. position. Check the
"TRAVEL MODE" light on the touch panel. If the light is not on, go to PART 3. Section B of the repair
steps. If the "TRAVEL MODE" light is on, check the link lights on the I/O module and the touch panel.
They should be flashing. If either light is not on or is on steady, review PART 1. If power and
communication is ok, there may be a short to ground on the (#2) 8500 master relay control wire or
SEE: MP84.3240
SEE: MP84.3130
IS BEING PUSHED.
PARK/BRAKE" LIGHT IS NOT COMING ON.
1. The red master relay LED is NOT on.
the master relay coil may have a short to ground.
B.
A.
circuit.
PUSH AND HOLD AN UP ARROW.
PUSH AND HOLD THE CORRESPONDING DOWN ARROW.
SEE: MP84.3170
SEE: MP84.3170
The jacks should retract fully and the jack
MANUAL SYSTEM OPERATION
725 TROUBLE SHOOTING STEPS
PART 7a. EXTENDING JACKS WITH UP ARROW BUTTONS
If a ground is present,
make sure the 9000 wire is securely seated into the 32 pin harness connector. Replace the I/O
module if the wire is OK. the problem is the pin connection to the
the park brake circuit or switch.
2200
DIAGRAM- SENSING UNIT
SEEELECTRICAL CONNECTION DIAGRAM
LEVELINGSYSTEM HYDRAULIC MANIFOLD
PUMPAND MASTER RELAYS
SEEELECTRICAL CONNECTION
3200
PRESSURE SWITCH
MULTIPLEXEDINPUT/OUTPUT MODULE
SEEELECTRICAL CONNECTION DIAGRAM
TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES
PARK BRAKE - MASTER WARNING LIGHT AND BUZZER
MP84.3130
TRAVEL
MP84.3170
RESISTOR
DONOT CUT
TERMINATING
9001 - TO
DIODE PARK BRAKE
LIGHT
PRESSURE SWITCH
NOTE:DIODE ARRANGEMENT MAY NOT BE
4200
6235
AB
4000
PRESENTON ALL INSTALLATIONS
6120 - TO +12V ACC.
LR WARNING
SWITCH
15AMP
FUSE
AB
3000 6235
SWITCH
WARNING
PRESSURE
WARNING
BUZZER
6111
12V IGNITION
CONNECT TO
SWITCH
9000
725 SERIES SINGLE STEP LEVELING SYSTEM
ELECTRICAL CONNECTION DIAGRAM
1000
WARNING
MASTER
LIGHT
+
DIODE
6111
SWITCH
PARK BRAKE
7699 7699
1200
FUSE
5AMP
LF SWITCH
6235
AB
6235
RESISTOR
TERMINATING
DONOT CUT
WARNING!
TOUCH PANEL
UNDERSTANDOPERATOR’SMANUALBEFOREUSING. BLOCK FRAME AND TIRES
SECURELYBEFOREREMOVINGTIRESOR CRAWLING UNDER VEHICLE.
HWHCOMPUTERIZED LEVELING
R
LEVEL
AUTO
AUTO
STORE
CANCEL
_
EXTEND
RETRACT
EXTEND
EXCESS
SLOPE
PARK/
NOTIN
RETRACT
TRAVEL
MODE
BRAKE
MANUAL
WARNING
SWITCH
PRESSURE
SWITCH
AB
2000
MASTER RELAY
843267 5 A
D
C
B
1
LINK LIGHT
PUMP RELAY DUMP
MP84.3130
08JUN11
RR
8101
8100
RF
SWITCH
PRESSURE
50 LB
PUMP AND MASTER RELAYS
LEVELING SYSTEM HYDRAULIC MANIFOLD
ELECTRICAL CONNECTION DIAGRAM
#4
MULTIPLEX I/O MODULE
DETAIL (A) - TOP VIEW
6230 (RELAY GND)
RELAY (A)
MASTER
+12 VOLT
BATTERY
TO
#9
+
CONTROL
8500 (BLACK)
MASTER RELAY
#1
#3
#2
MOTOR
PUMP
6230 (RELAY GND)
40 AMP
FUSE
6800
LR
BA
SWITCH
PRESSURE
3000 LB
8100
TO GROUND STUD
ON PUMP (6230)
4400
6230
6230
ABA
1400
2400
6230
BAB
3400
6230
AB
P.E.DP.E.D
LR
P.E.D P.E.D
RR
SEE ELECTRICAL CONNECTION
DIAGRAM - 725 SERIES
SINGLE STEP LEVELING
SYSTEM
CONTROL
PUMP
RELAY (B)
#7
#8
#5
#6 GROUND STUD
SIDE VIEW
POWER UNIT
8600 - (BLACK)
PUMP RELAY
RRRFLF
AB BBA A
07JUN11
MP84.3240
MULTIPLEX
SEE DETAIL (A)
I/O MODULE
DEUTSCH CONNECTOR
GROUND STUD IN MANIFOLD
SHOWN HERE BENEATH THE
RELAY (A)
SEE DETAIL (A)
LF
RF
MASTER
MOTOR
PUMP
MULTIPLEX I/O MODULE
8101
RELAY (B)
TOP VIEW
POWER UNIT
PUMP
MP84.3240
MP84.3170
LINK LIGHT
PUMP RELAY
MASTER RELAY
DUMP
TRAVEL
PRESSURE
PUMP
RELAY (B)
MP84.3240
ELECTRICAL CONNECTION DIAGRAM
PUMP AND MASTER RELAYS
LEVELING SYSTEM HYDRAULIC MANIFOLD
CONTROL
8500 (BLACK)
MASTER RELAY
RELAY (A)
MASTER
MULTIPLEX I/O MODULE
DETAIL (A) - TOP VIEW
6230 (RELAY GND)
BATTERY
TO
+12 VOLT
#4
MOTOR
#2
#3
#1
#9
+
#8
PUMP
6230 (RELAY GND)
40 AMP
FUSE
6800
LR
B
LF
ABA
SWITCH
PRESSURE
3000 LB
ON PUMP (6230)
TO GROUND STUD
A
6230
AB
6230
4400
8100
6230
B
1400
ABAB
2400
3400
6230
LF
P.E.DP.E.D
LR
P.E.D P.E.D
RF
RR
SWITCH
50 LB
SEE ELECTRICAL CONNECTION
DIAGRAM - 725 SERIES
07JUN11
MP84.3240
MULTIPLEX
SEE DETAIL (A)
I/O MODULE
SINGLE STEP LEVELING
SIDE VIEW
GROUND STUD
POWER UNIT
#5
#6
#7
8600 - (BLACK)
PUMP RELAY
CONTROL
RF
BBA A
RR SYSTEM
PUMP
RELAY (B)
TOP VIEW
POWER UNIT
GROUND STUD IN MANIFOLD
SHOWN HERE BENEATH THE
SEE DETAIL (A)
DEUTSCH CONNECTOR
RELAY (A)
MASTER
MOTOR
PUMP
MULTIPLEX I/O MODULE
8101
and
MP84.3520

MI91.327K
01NOV11
PART 7a. SECTION B.2. CONTINUED
SEE: MP84.3240
Use battery power from terminal 1 of the master relay to check terminal 8 of the pump relay for
ground. Fix the ground connection for terminal 8 if necessary. If the pump now runs, continue
with testing for PART 7. If the ground for terminal 8 is ok, use terminal 8 of the pump relay to
check for +12 volts on terminals 5, 6 and 7 of the pump relay.
there is a problem with the cable, connections or
+12 volt supply. With the master relay LED on, there should be voltage on terminal 2 of the master
relay. If there is no voltage on terminal 2, check the master relay control wire (8500), the ring terminal
If everything with the wire and connection is ok and there is no voltage on the wire with the master
Note: If you are using terminal 4 for a ground connection, remember to make sure terminal 4
has a good ground connection. If terminals 1 and 2 have no voltage, check terminal 1 to a
good frame ground. If terminal 1 does have voltage, there is a problem with the ground
connection for terminal 4. Check the pump mounting and the system ground connection.
For the relay to turn on, there must be at least 8
volts between terminals 2 and 4 while pushing an UP arrow. If the voltage is low, PART 3 section B
explains how to check voltage. This section is used to check when there is no voltage but can be
used to track down a low voltage issue. If voltage between terminals 2 and 3 is adequate, replace
check the 40 amp fuse in the #10 wire going from terminal 3 to the I/O
module. If the fuse is blown, the I/O module will have to be replaced. If the 40 amp fuse is blown,
check each solenoid valve to make sure none have a direct short to ground. If the fuse is ok, check
the ring terminal and the ring terminal connection to terminal 3 of the master relay. If the wire, ring
terminal, fuse and connection to terminal 3 are ok, the problem is the I/O module or a short to ground
on the 8600 pump relay wire or the coil of the pump relay.
Turn the ignition off. Remove wire 8600 from terminal 6 of the pump relay. Make sure the 8600 wire
ring terminal is isolated from ground. Wait a minute or two and turn the ignition back on. Check the
pump LED while pushing an UP arrow. If the pump LED still does not come on or goes out after a few
moments, make sure the 8600 wire is not shorted to ground. If it is, repair it. If the wire is ok, replace
the I/O module. If the pump LED stays on, release the UP arrow, then re-attach the 8600 wire to
terminal 6 of the pump relay. Push an UP arrow, the pump should run. If the pump runs, continue the
test. If the pump will not run and the pump LED is off, replace the pump relay.
3. The master and pump relay LEDs are on while pushing an UP arrow. The pump does not run.
The lit pump LED indicates the master relay is working. Check for voltage at the pump motor on terminal
#9 while any UP arrow is being pushed. Use the ground stud or bolt on the side of the pump for the test
equipment ground. If there is at least 9 volts present at terminal #9, the pump motor should run. The pump
will sound very sluggish when the voltage is below 10 volts, but it will run. If voltage is present, replace
the pump motor. If voltage is not present, continue with the following diagnostic.
Note: Although the pump motor is bad if there is at least 9 volts at the motor and it will not
run, there are also other issues with the system such as ground issues, connection issues,
wiring issues or battery issues. These things should be checked. If everything is correct,
voltage at the pump motor should remain well above 10 1/2 volts with the pump running
If terminals 1 and 2 of the master relay have power, check terminal 3.
low voltage could be an issue.
and terminal connection to the relay.
relay LED on, replace the I/O module.
under load.
If terminal 3 has power,
SEE: MP84.3240
SEE: MP84.3240
If there is no voltage on terminal 1 (+12 battery),
SEE: MP84.3240
SEE: MP84.3240
If terminal 3 has no power,
MANUAL SYSTEM OPERATION
725 TROUBLE SHOOTING STEPS
the master relay.
MULTIPLEX I/O MODULE
DEUTSCH CONNECTOR
SEE DETAIL (A)
PUMP AND MASTER RELAYS
LEVELING SYSTEM HYDRAULIC MANIFOLD
8600 - (BLACK)
CONTROL
PUMP RELAY
GROUND STUD IN MANIFOLD
SHOWN HERE BENEATH THE
MP84.3240
GROUND STUD
POWER UNIT
6230 (RELAY GND)
+12 VOLT
BATTERY
TO
RELAY (A)
MASTER
#1
#3
#4 #2
CONTROL
8500 (BLACK)
MASTER RELAY
+
#9
MOTOR
6230 (RELAY GND)
PUMP
6800
#6
RELAY (B)
#7
#5
#8
PUMP
MULTIPLEX I/O MODULE
DETAIL (A) - TOP VIEW
TO GROUND STUD
ON PUMP (6230)
FUSE
40 AMP
4400
6230
AB
SWITCH
PRESSURE
3000 LB
6230
1400
2400
6230
3400
6230
AB BA AB
8100
LR
AB
P.E.D
LR
RR
ABA
LF
B A
RF
B
SWITCH
50 LB
PRESSURE
P.E.DP.E.DP.E.D
RR
RF
LF
8101
MULTIPLEX
SEE DETAIL (A)
I/O MODULE
SIDE VIEW
07JUN11
MP84.3240
SEE ELECTRICAL CONNECTION
DIAGRAM - 725 SERIES
SINGLE STEP LEVELING
SYSTEM
RELAY (A)
MASTER
MOTOR
PUMP
RELAY (B)
TOP VIEW
POWER UNIT
PUMP
MP84.3170
ELECTRICAL CONNECTION DIAGRAM
PUMP RELAY
MASTER RELAY
LINK LIGHT
TRAVEL
DUMP
MP84.3240
RELAY (B)
PUMP
6230 (RELAY GND)
DETAIL (A) - TOP VIEW
MULTIPLEX I/O MODULE
MASTER
RELAY (A)
MASTER RELAY
8500 (BLACK)
CONTROL
+12 VOLT
TO
BATTERY
#4
6230 (RELAY GND)
PUMP
MOTOR
#1
#3
#2
+
#9 #8
6800
40 AMP
FUSE
TO GROUND STUD
ON PUMP (6230)
4400
6230
BA
6230
LR
B A BA
LF
P.E.D
LR
SHOWN HERE BENEATH THE
GROUND STUD IN MANIFOLD
SINGLE STEP LEVELING
I/O MODULE
SEE DETAIL (A)
MULTIPLEX
MP84.3240
07JUN11
DIAGRAM - 725 SERIES
SEE ELECTRICAL CONNECTION
PUMP RELAY
8600 - (BLACK)
POWER UNIT
GROUND STUD
SIDE VIEW
#7
#6
#5
CONTROL
DEUTSCH CONNECTOR
RR
AABB
RF SYSTEM
MASTER
RELAY (A)
LEVELING SYSTEM HYDRAULIC MANIFOLD
PUMP AND MASTER RELAYS
ELECTRICAL CONNECTION DIAGRAM
PRESSURE
3000 LB
PRESSURE
SWITCH
6230
3400
2400
BA BA
1400
B
6230
A
8100
P.E.DP.E.DP.E.D
RR
RF
LF
50 LB
SWITCH
POWER UNIT
TOP VIEW
RELAY (B)
PUMP
MULTIPLEX I/O MODULE
SEE DETAIL (A)
8101
PUMP
MOTOR
SEE: MP84.3240
SEE: MP84.3240
MP84.3240
RELAY (B)
PUMP
6230 (RELAY GND)
MASTER
RELAY (A)
MASTER RELAY
8500 (BLACK)
CONTROL
+12 VOLT
BATTERY
TO
#4
6230 (RELAY GND)
PUMP
MOTOR
#1
#3
#2
+
#9
40 AMP
FUSE
#8
6800
I/O MODULE
SEE DETAIL (A)
MULTIPLEX
MP84.3240
07JUN11
PUMP RELAY
8600 - (BLACK)
POWER UNIT
GROUND STUD
SIDE VIEW
#7
#6
#5
CONTROL
LEVELING SYSTEM HYDRAULIC MANIFOLD
PUMP AND MASTER RELAYS
ELECTRICAL CONNECTION DIAGRAM
PRESSURE
3000 LB
PRESSURE
SWITCH
DETAIL (A) - TOP VIEW
MULTIPLEX I/O MODULE
RF
P.E.D
TO GROUND STUD
ON PUMP (6230)
A
1400
B
6230
A
4400
6230
BA
6230
LR
B A BA
LF
P.E.DP.E.D
LF
LR
8100
6230
3400
2400
BA B
50 LB
P.E.D
SWITCH
RR
POWER UNIT
TOP VIEW
RELAY (B)
PUMP
SHOWN HERE BENEATH THE
GROUND STUD IN MANIFOLD
SINGLE STEP LEVELING
DIAGRAM - 725 SERIES
SEE ELECTRICAL CONNECTION
PUMP
DEUTSCH CONNECTOR
RR
AABB
RF SYSTEM
MASTER
RELAY (A)
MOTOR
MULTIPLEX I/O MODULE
SEE DETAIL (A)
8101
MP84.3240
PUMP
ELECTRICAL CONNECTION DIAGRAM
PUMP AND MASTER RELAYS
LEVELING SYSTEM HYDRAULIC MANIFOLD
PRESSURE
RELAY (B)
MASTER
MULTIPLEX I/O MODULE
DETAIL (A) - TOP VIEW
6230 (RELAY GND)
CONTROL
8500 (BLACK)
MASTER RELAY
RELAY (A)
TO
BATTERY
+12 VOLT
#4
MOTOR
6230 (RELAY GND)
PUMP
#3 +
#1
#2 #9 #8
40 AMP
FUSE
ON PUMP (6230)
TO GROUND STUD
6800
B A B A
LR LF
SWITCH
PRESSURE
3000 LB
6230
2400
B
6230
1400
6230
4400
6230
AB ABA
8100
3400
AB
P.E.DP.E.D P.E.D
LR
LF
RF
P.E.D
SWITCH
RR
50 LB
RELAY (A)
GROUND STUD IN MANIFOLD
SHOWN HERE BENEATH THE
MULTIPLEX
SEE DETAIL (A)
I/O MODULE
SEE ELECTRICAL CONNECTION
DIAGRAM - 725 SERIES
SINGLE STEP LEVELING
07JUN11
MP84.3240
SIDE VIEW
8600 - (BLACK)
PUMP RELAY
GROUND STUD
POWER UNIT
#5
#6
#7
CONTROL
DEUTSCH CONNECTOR
ABAB
RRRF SYSTEM
RELAY (B)
PUMP
TOP VIEW
POWER UNIT
MULTIPLEX I/O MODULE
SEE DETAIL (A)
8101
MASTER
MOTOR
PUMP
SEE: MP84.3240

MI91.327L
01NOV11
PART 7a. SECTION B.3. CONTINUED
a. If the jack will not extend with the valve manually open, the problem is most likely the shuttle
valve. Refer to Section C. and check the pump pressure. There should be 3500 psi with the pump
running under load and nothing moving. If there is 1000 psi or more, a jack should extend with the
solenoid valve manually opened. If there is low pump pressure, check voltage at the pump motor
while running under load.
of the pump relay, there is a problem with the cable between
the master and pump relay or a problem with the cable connections on terminal 4 of the master
relay or terminal 5 of the pump relay. Repair as necessary.
of the pump relay, there is a problem with the
connection for wire 8600 to terminal 6, a problem with the 8600 wire, or a problem with the I/O
module. If there is no voltage on the ring terminal for the 8600 wire, remove a small amount of
If there is no voltage on the 8600 wire at the module, replace the module. If there is voltage, repair
the wire if possible. If not possible, the I/O module will have to be replaced. If there is voltage on
the ring terminal, clean and repair the connection of the ring terminal to the number 6 terminal of the
pump relay. If the pump now runs, continue with PART 7. If the pump still does not run with power
SEE: MP84.3240
If there is voltage on terminal 5 and 6 and ground on terminal 8 of the pump relay,
SEE: MP84.3240
THE PUMP WILL RUN WHEN PUSHING ONE OR MORE UP ARROW BUTTONS BUT WILL NOT
RUN WHEN PUSHING A DIFFERENT UP ARROW BUTTON.
THE PUMP RUNS UNDER NO LOAD WHEN PUSHING ANY UP ARROW BUTTON.
extending or jacks are extending slowly and will not properly lift the vehicle and there are no visible oil
leaks. If the vehicle is equipped with HWH room extension mechanisms, make sure none of the rooms
are moving while trying to operate the jacks. If the vehicle is equipped with HWH room extension
mechanisms, check to see if the rooms are operating properly.
Make sure there is the proper amount of fluid in the reservoir. If the reservoir is full, the problem will be
low pump pressure or a faulty shuttle valve. You will need a 5000 psi pressure gauge to check this. A
gauge may be obtained from HWH Corporation. Remove the U shaped tube from the manifold fitting,
not the shuttle valve. Attach the pressure gauge to the manifold fitting. With the ignition on, jump +12
volts from terminal 5 of the pump relay to terminal 6 of the pump relay. The pump should start running.
Check the pressure. The pump should have 3500 psi. The acceptable range is 3300 psi. to 3600 psi.
If the pump is only several hundred psi low, the relief valve on the pump can be adjusted to bring the
pressure up to the acceptable range. If the pump pressure is drastically low, check voltage at the pump
motor while running under load. If the voltage is below 9 volts, check connections, the pump ground,
master and pump relays, cables and the battery supply. Repair problem equipment so there is at least
10.5 volts or more at the pump motor when running under a load. If voltage at the pump motor is ok
and pump pressure is low, replace the pump. If pump pressure is acceptable, replace the shuttle valve.
THE PUMP RUNS UNDER LOAD WHEN PUSHING ANY UP ARROW BUTTON BUT NO JACKS ARE
Check the individual solenoid valve LEDs on the I/O module while pushing an UP arrow button.
The appropriate solenoid valve LEDs should come on while pushing an UP arrow button.
1. If the solenoid valve LEDs are coming on while pushing UP arrow buttons,
solenoid valves should be opening. Manually open a solenoid valve and push an up arrow button.
SEE: MP64.3917 and MP84.3240
on terminal 6, continue to the next paragraph.
no voltage on terminal 7 of the pump relay, the pump relay needs to be replaced.
E.
EXTENDING.
D.
C.
insulation from the wire close to the I/O module.
If there is no voltage on terminal 5
If there is voltage on terminal 5 but not terminal 6
SEE: MP84.3170
this indicates the
but there is
The touch panel will have to be replaced.
No jacks are
MANUAL SYSTEM OPERATION
725 TROUBLE SHOOTING STEPS
SEE: MP84.3240
BE EQUIPPED WITH VALVE RELEASE NUTS OR
VALVES OR FOUR (4) SMALL VALVES
MANIFOLDS MAY HAVE FOUR (4) LARGE
VELOCITY VALVE
BREATHER
625/725 SERIES LEVELING SYSTEM
ASSEMBLY
PUMP/MANIFOLD
(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
BEFORE OPERATING MANUAL
valve tube.
REAR
LEFT
WITH VELOCITY
ARE EQUIPPED
MANIFOLDS
NOTE: SOME
SWITCH
PRESSURE
3000PSI
HERE
VALVES
LR LF
shuttle valve and shuttle
to be removed to access
may need to be removed
not shown, load center
NOTE: Load center is
FRONT
LEFT
NOTE:
WITH RELEASE
SMALL VALVES
LARGE AND
RELEASE CAMS.
CHECK
PRESSURE
NUTS
CAP
VALVES (4)
LOCATION
SWITCH
ALTERNATE
3000 PSI
PRESSURE
RF RR
SWITCH
PRESSURE
VALVE
SHUTTLE
50PSI
07JUN11
MP64.3917
RIGHT
REAR
WITH RELEASE
SMALL VALVES
LARGE AND
CAMS
OUTER
CHECK
FRONT
RIGHT
MP64.3917
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
GROUND FROM PARK BRAKE SWITCH
SWITCHED GROUND FROM SENSING UNIT - FRONT
SWITCHED GROUND FROM SENSING UNIT - LEFT SIDE
SWITCHED GROUND FROM LEFT FRONT JACK PRESSURE SWITCH
SWITCHED GROUND FROM LEFT FRONT JACK WARNING SWITCH
NO CONNECTION
GROUND FOR JACK WARNING SWITCHES
+12 VOLT ACCESSORY POWER FOR I/O MODULE
SWITCHED GROUND FROM SENSING UNIT - RIGHT SIDE
NO CONNECTION
SWITCHED GROUND FROM LEFT REAR JACK WARNING SWITCH
SWITCHED GROUND FROM SENSING UNIT - REAR
GROUND FOR LEVEL SENSING UNIT
SHIELD WIRE FOR GREEN & YELLOW CAN COMMUNICATION WIRES
+12 VOLT POWER FOR LEVEL SENSING UNIT
SWITCHED GROUND FROM 3000 PSI MANIFOLD PRESSURE SWITCH
NO CONNECTION
SWITCHED GROUND FROM LEFT REAR JACK PRESSURE SWITCH
SWITCHED GROUND FROM RIGHT REAR JACK WARNING SWITCH
NO CONNECTION
GROUND TO THE TOUCH PANEL
CAN LOW COMMUNICATION WIRE
+12 VOLT POWER TO THE TOUCH PANEL
SWITCHED GROUND FROM 50 PSI MANIFOLD PRESSURE SWITCH
SWITCHED GROUND FROM RIGHT REAR JACK PRESSURE SWITCH
SWITCHED GROUND FROM RIGHT FRONT JACK PRESSURE SWITCH
SWITCHED GROUND FROM RIGHT FRONT JACK WARNING SWITCH
NO CONNECTION
CAN HIGH COMMUNICATION WIRE
LED AND WIRE/CONNECTION INFORMATION
A1 - (+12 BLACK WIRE 8601) INPUT WHEN EXTENSION DEVICES ROOMS, GEN SLIDE, STEP COVER ECT. ARE USED
MULTIPLEXED INPUT/OUTPUT MODULE
ELECTRICAL CONNECTION DIAGRAM
PIN #
BLACK
BLACK
BLACK
BLACK
BLACK
WHITE
BLACK
BLACK
BLACK
WHITE
BLACK
BLACK
BLACK
WHITE
GREEN
BLACK
BLACK
BLACK
BLACK
YELLOW
COLOR
C5
C6 AND C7
D8
D7
D6
D5
D4
D3
D2
D1
C8 RED
B2
B8
C4
C3
C2
C1
B7
B6
B5
B4
B3
N/A
RED
A3 AND A4
A5
B1
A8
A7
A6
A2
RED
4000
9000
0200
0100
1200
1000
6235
6120
0300
NUMBER
N/A
8100
0400
6231
N/A
6121
4200
3000
6230
2000
6800
8101
3200
2200
N/A
BUT NOT ALWAYS USED
NOTE: DUMP AND TRAVEL LEDS PRESENT
WIRE
CONNECTOR
MODULE
OF I/O
FRONT VIEW 18
WIRE
67 54 3 2
D
C
B
A
WIRE DESCRIPTION AND FUNCTION
06JUN11
MP84.3170
GROUND STUD
TRAVEL
DUMP
LEFT REAR JACK
LEFT FRONT JACK
RIGHT FRONT JACK
RIGHT REAR JACK
MP84.3170
RELAY (B)
PRESSURE
LEVELING SYSTEM HYDRAULIC MANIFOLD
PUMP AND MASTER RELAYS
ELECTRICAL CONNECTION DIAGRAM
PUMP
RELAY (A)
MASTER RELAY
8500 (BLACK)
CONTROL
6230 (RELAY GND)
DETAIL (A) - TOP VIEW
MULTIPLEX I/O MODULE
MASTER
+12 VOLT
BATTERY
TO
#4 #2
#1
#3
#9
+
#8
PUMP
6230 (RELAY GND)
MOTOR
40 AMP
FUSE
6800
LR
B
LF
ABA
3000 LB
PRESSURE
SWITCH
TO GROUND STUD
ON PUMP (6230)
BA
6230
4400
BA
3400
ABA
6230
1400
6230
B
2400
6230
P.E.D
LR
P.E.DP.E.DP.E.D
RR
RF
LF
8100
50 LB
SWITCH
DIAGRAM - 725 SERIES
MP84.3240
07JUN11
SINGLE STEP LEVELING
I/O MODULE
SEE DETAIL (A)
MULTIPLEX
POWER UNIT
GROUND STUD
SIDE VIEW
#7
#6
#5
PUMP RELAY
8600 - (BLACK)
CONTROL
RF RR
B A B A
SYSTEM
POWER UNIT
TOP VIEW
PUMP
RELAY (B)
SEE ELECTRICAL CONNECTION
SHOWN HERE BENEATH THE
GROUND STUD IN MANIFOLD
DEUTSCH CONNECTOR
MASTER
RELAY (A)
PUMP
MOTOR
SEE DETAIL (A)
MULTIPLEX I/O MODULE
8101
MP84.3240
MP84.3240
RELAY (B)
PUMP
RELAY (A)
MASTER RELAY
8500 (BLACK)
CONTROL
6230 (RELAY GND)
MASTER
+12 VOLT
BATTERY
TO
#4
PUMP
6230 (RELAY GND)
MOTOR
#2
#1
#3
#9
+
#8
6800
MP84.3240
07JUN11
I/O MODULE
SEE DETAIL (A)
MULTIPLEX
PUMP RELAY
8600 - (BLACK)
POWER UNIT
GROUND STUD
SIDE VIEW
#7
#6
#5
CONTROL
PRESSURE
LEVELING SYSTEM HYDRAULIC MANIFOLD
PUMP AND MASTER RELAYS
ELECTRICAL CONNECTION DIAGRAM
3000 LB
PRESSURE
SWITCH
DETAIL (A) - TOP VIEW
MULTIPLEX I/O MODULE
LF
P.E.D
40 AMP
FUSE
TO GROUND STUD
ON PUMP (6230)
A
6230
BA
6230
4400
LR
B
LF
ABA
P.E.D
LR
8100
BA
3400
A B
6230
1400
B
2400
6230
P.E.DP.E.D
RR
RF
50 LB
SWITCH
POWER UNIT
TOP VIEW
PUMP
RELAY (B)
SEE ELECTRICAL CONNECTION
SHOWN HERE BENEATH THE
GROUND STUD IN MANIFOLD
SINGLE STEP LEVELING
DIAGRAM - 725 SERIES
DEUTSCH CONNECTOR
RF RR
B A B A
SYSTEM
MASTER
RELAY (A)
SEE DETAIL (A)
MULTIPLEX I/O MODULE
8101
PUMP
MOTOR

MI91.327M
19MAR12
PART 7a. SECTION E.1.a. CONTINUED
or more at the pump motor when running under load. If pump pressure is ok, replace the shuttle
relays, cables and the battery supply. Repair problem equipment so there is at least 10.5 volts
If the voltage is below 9 volts, check electrical connections, the pump ground, master and pump
If voltage is good at the relay and low at the valves, there is a problem with the I/O module or the
main ground for the I/O module. If voltage is low at the master relay, check voltage into the relay
and replace or repair equipment as needed to fix the voltage problem. If voltage at the solenoid
valves is ok, the problem is the solenoid valves. It would be rare to have 4 bad valves so you
should contact HWH Corporation to discuss possible issues that could cause all 4 valves to be
briefly and goes out, replace the solenoid valve. If the LED is staying on but the jack will not extend,
If the LED is coming on, plug the valve back in and retry. If the LED will not come on or comes on
while pushing the appropriate UP arrow button. If the LED does not come on, replace the I/O module.
a couple minutes then turn the ignition back on to the "ACC." position and check the solenoid valve LED
Make sure the ignition is off. Unplug the valve for the jack that will not extend. Wait
2. The solenoid valve LED for the jack that will not extend is not coming on while pushing the
to the manifold fitting. Check the pressure while pushing the UP arrow button.
remove that jack hose from the manifold and attach a pressure gauge
system voltage at the master relay. If there is low voltage only at one valve, replace the I/O module.
voltage is low, check voltage at other valves that are working. If voltage is marginal for other valves, check
arrow button with the valve plugged in. If voltage is 8.5 volts or better, replace the solenoid valve. If
check voltage between the white and black wire for the solenoid valve while pushing the UP
Manually open the solenoid valve then push an UP arrow button for that jack.
1. The solenoid valve LED is coming on while pushing the UP arrow button but the jack will not
button. There should always be two solenoid valve LEDs on while pushing an UP arrow button.
Check the appropriate solenoid valve LEDs while pushing the UP arrow
ONE OR MORE JACKS WILL NOT EXTEND. OTHER JACKS ARE WORKING PROPERLY AND THE
part 1. If the LEDs do not come on or come on briefly and go out, replace the solenoid valves.
come on and stay on, the jacks should be extending. If they are not extending, check PART 7 Section E
come on, plug the valves back in. Again check the LEDs while pushing an UP arrow button. If the LEDs
while pushing an UP arrow button. If the LEDs do not come on, replace the I/O module. If the LEDs
sure the ignition is off. Wait several minutes. Turn the ignition on and check the solenoid valve LEDs
Make sure the valves are marked so they can be reconnected easily. Unplug all four valves and make
there are two possibilities. Either the I/O module is bad or there are 4 bad solenoid valves.
2. If the solenoid valve LEDs are not coming on while pushing UP arrow buttons and the pump
should contact HWH Corporation to discuss possible issues that could cause all 4 valves to be bad.
valves is ok, the problem is the solenoid valves. It would be rare to have 4 bad valves so you
and replace or repair equipment as needed to fix the voltage problem. If voltage at the solenoid
main ground for the I/O module. If voltage is low at the master relay, check voltage into the relay
If voltage is good at the relay and low at the valves, there is a problem with the I/O module or the
If voltage is low, check the voltage at terminal #3 of the master relay while pushing an up arrow.
pushing the UP arrow buttons. If there is a minimum of 8.5 volts at the valve, the valve should open.
the valve plugged in, check voltage between the white and black wire for the solenoid valves while
b. If the jack extends after manually opening the valve,
PUMP IS RUNNING NORMALLY.
check Part 1 of this section.
UP arrow button.
If the jack still does not extend,
extends,
extend.
SEE: MP84.3240
SEE: MP64.3917 and MP84.3240
SEE: MP84.3240
is running,
F.
bad.
SEE: MP64.3917 and MP84.3240
SEE: MP84.3170
If the jack now
SEE: MP84.3240
SEE: MP84.3240
there is a valve or voltage issue. With
MANUAL SYSTEM OPERATION
725 TROUBLE SHOOTING STEPS
valve.
If there is good
pressure,
there is a problem with theIf there is no pressure,
solenoid valve or the inner check valve for that jack. Contact HWH Corporation for assistance.
reconnect the hose to the manifold and remove the hose at the jack. There should be a
good flow of fluid to the jack when pushing the UP arrow. If there is no flow, the hose is the problem.
If there is good flow, replace the jack cylinder.
MP64.3917
MP84.3170
LEFT FRONT JACK
LEFT REAR JACK
LINK LIGHT
MASTER RELAY
PUMP RELAY DUMP
TRAVEL
GROUND STUD
RIGHT REAR JACK
RIGHT FRONT JACK
ELECTRICAL CONNECTION DIAGRAM
MULTIPLEXED INPUT/OUTPUT MODULE
LED AND WIRE/CONNECTION INFORMATION
NOTE: DUMP AND TRAVEL LEDS PRESENT
BUT NOT ALWAYS USED
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
CHECK
shuttle valve and shuttle
NOTE: SOME
MANIFOLDS
ARE EQUIPPED
WITH VELOCITY
LEFT
REAR
valve tube.
VALVES
3000PSI
PRESSURE
SWITCH
PRESSURE
HERE
ASSEMBLY
VELOCITY VALVE
PUMP/MANIFOLD
LR LF RF RR
LARGE AND
SMALL VALVES
WITH RELEASE
NOTE: Load center is
not shown, load center
may need to be removed
to be removed to access
LEFT
FRONT
NUTS
BEFORE OPERATING MANUAL
BREATHER
CAP
RELEASE CAMS.
NOTE:
RIGHT
REAR
MP64.3917
07JUN11
CHECK
SHUTTLE
VALVE
PRESSURE
SWITCH
VALVES (4)
50PSI
PRESSURE
ALTERNATE
LOCATION
3000 PSI
SWITCH
OUTER
LARGE AND
SMALL VALVES
WITH RELEASE
CAMS
RIGHT
FRONT
MP84.3240
PUMP RELAY
8600 - (BLACK)
CONTROL
#9
MASTER
RELAY (A)
TO
BATTERY
+12 VOLT
6230 (RELAY GND)
#4 #2
MASTER RELAY
8500 (BLACK)
CONTROL
#3
#1
FUSE
40 AMP
RELAY (B)
PUMP
6230 (RELAY GND)
PUMP
MOTOR
+
6800
#5
#8
#7
#6
SIDE VIEW
MP84.3240
07JUN11
POWER UNIT
GROUND STUD
I/O MODULE
SEE DETAIL (A)
MULTIPLEX
MULTIPLEX I/O MODULE
SEE DETAIL (A)
ELECTRICAL CONNECTION DIAGRAM
LEVELING SYSTEM HYDRAULIC MANIFOLD
PUMP AND MASTER RELAYS
TO GROUND STUD
MULTIPLEX I/O MODULE
1400
DETAIL (A) - TOP VIEW
ON PUMP (6230)
B A BA
6230
6230
4400
3000 LB
PRESSURE
SWITCH 8100
BA
6230
3400
BA
6230
2400
LR
AB
LR
P.E.D P.E.D
ABBA
LF RF
AB
RR
LF
RR
50 LB
PRESSURE
SWITCH
P.E.DP.E.D
RF
8101
MASTER
RELAY (A)
SHOWN HERE BENEATH THE
GROUND STUD IN MANIFOLD
DEUTSCH CONNECTOR
SYSTEM
SINGLE STEP LEVELING
DIAGRAM - 725 SERIES
SEE ELECTRICAL CONNECTION
PUMP
MOTOR
PUMP
POWER UNIT
TOP VIEW
RELAY (B)
MP84.3240
RELAY (B)
PUMP
FUSE
40 AMP
MASTER RELAY
8500 (BLACK)
CONTROL
6230 (RELAY GND)
TO
BATTERY
+12 VOLT MASTER
RELAY (A)
#4
#3
#1
#2
6230 (RELAY GND)
+
#9
PUMP
MOTOR
#5
#8
#7
6800
MULTIPLEX
SEE DETAIL (A)
I/O MODULE
MP84.3240
07JUN11
SIDE VIEW
POWER UNIT
GROUND STUD
8600 - (BLACK)
PUMP RELAY
CONTROL
#6
8101
B
RR
ELECTRICAL CONNECTION DIAGRAM
LEVELING SYSTEM HYDRAULIC MANIFOLD
PUMP AND MASTER RELAYS
8100
ON PUMP (6230)
DETAIL (A) - TOP VIEW
TO GROUND STUD
MULTIPLEX I/O MODULE
1400
B A BA
6230
6230
4400
SWITCH
BA
6230
3400
BA
6230
2400
3000 LB
PRESSURE
P.E.D P.E.D
AB
LR
ABBA
LF RF
LR
LF
P.E.DP.E.D
RR
RF
50 LB
PRESSURE
SWITCH
PUMP
POWER UNIT
TOP VIEW
RELAY (B)
SHOWN HERE BENEATH THE
GROUND STUD IN MANIFOLD
SINGLE STEP LEVELING
DIAGRAM - 725 SERIES
SEE ELECTRICAL CONNECTION
DEUTSCH CONNECTOR
A
SYSTEM
MASTER
RELAY (A)
MOTOR
MULTIPLEX I/O MODULE
SEE DETAIL (A)
PUMP
PUMP AND MASTER RELAYS
LEVELING SYSTEM HYDRAULIC MANIFOLD
ELECTRICAL CONNECTION DIAGRAM
8101
TO GROUND STUD
ON PUMP (6230)
8100
4400
6230
6230
ABAB
1400
PRESSURE
SWITCH
2400
6230
AB
3400
6230
AB
3000 LB
P.E.DP.E.D
LR
LF
P.E.D P.E.D
RR
RF
SWITCH
PRESSURE
50 LB
SEE ELECTRICAL CONNECTION
DIAGRAM - 725 SERIES
SINGLE STEP LEVELING
GROUND STUD IN MANIFOLD
SHOWN HERE BENEATH THE
RELAY (B)
TOP VIEW
POWER UNIT
PUMP
DEUTSCH CONNECTOR
SYSTEM
RELAY (A)
MASTER
SEE DETAIL (A)
MULTIPLEX I/O MODULE
MOTOR
PUMP
MP84.3240
BE EQUIPPED WITH VALVE RELEASE NUTS OR
VALVES OR FOUR (4) SMALL VALVES
MANIFOLDS MAY HAVE FOUR (4) LARGE
VELOCITY VALVE
BREATHER
625/725 SERIES LEVELING SYSTEM
ASSEMBLY
PUMP/MANIFOLD
(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
BEFORE OPERATING MANUAL
valve tube.
REAR
LEFT
WITH VELOCITY
ARE EQUIPPED
MANIFOLDS
NOTE: SOME
SWITCH
PRESSURE
3000PSI
HERE
VALVES
LR LF
shuttle valve and shuttle
to be removed to access
may need to be removed
not shown, load center
NOTE: Load center is
FRONT
LEFT
NOTE:
WITH RELEASE
SMALL VALVES
LARGE AND
RELEASE CAMS.
CHECK
PRESSURE
NUTS
CAP
VALVES (4)
LOCATION
SWITCH
ALTERNATE
3000 PSI
PRESSURE
RF RR
SWITCH
PRESSURE
VALVE
SHUTTLE
50PSI
11JUL11
MP64.3917
RIGHT
REAR
WITH RELEASE
SMALL VALVES
LARGE AND
CAMS
OUTER
CHECK
FRONT
RIGHT
MP64.3917