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.