HWH 600 Series User manual

H
CORPORATION
H
W
R
FEATURING:
TOUCH PANEL CONTROL
HYDRAULIC LEVELING
HWH COMPUTER-CONTROLLED
OPERATOR’S MANUAL
HYD
DUMP
LEVEL
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
CAUTION!
OFF
NOT IN
TRAVEL
EXCESS
SLOPE
PARK/
BRAKE
STORE
AIR LEVELING
STRAIGHT-ACTING JACKS
RAISE
AIR
HWH COMPUTERIZED LEVELING
600 SERIES
LEVELING SYSTEM
16MAR01
ML11216/MP05.4505/CHA-S
(ON I-80, EXIT 267 SOUTH)
INTERNET: http: //www.hwhcorp.com
[phone] / [phone]
MOSCOW, IOWA 52760
2096 MOSCOW ROAD
HWH CORPORATION

CAUTION !
READ THE ENTIRE OPERATOR’S MANUAL BEFORE OPERATING.
MOVE FORWARD OR BACKWARD WITHOUT WARNING CAUSING INJURY OR DEATH.
CAUSING INJURY OR DEATH.
CHIPS, OIL LEAKS, ETC. FOLLOW ALL OTHER APPLICABLE SHOP SAFETY PRACTICES.
OPERATOR’S MANUAL
MP15.4501
30MAY01
BLOCK FRAME AND TIRES SECURELY BEFORE CRAWLING UNDER VEHICLE. DO NOT USE LEVELING JACKS OR AIR
SUSPENSION TO SUPPORT VEHICLE WHILE UNDER VEHICLE OR CHANGING TIRES. VEHICLE MAY DROP AND/OR
NEVER PLACE HANDS OR OTHER PARTS OF THE BODY NEAR HYDRAULIC LEAKS. OIL MAY PENETRATE SKIN
WEAR SAFETY GLASSES WHEN INSPECTING OR SERVICING THE SYSTEM TO PROTECT EYES FROM DIRT, METAL
IMPORTANT: IF COACH IS EQUIPPED WITH A ROOM EXTENSION, READ ROOM EXTENSION SECTION BEFORE
OPERATING LEVELING SYSTEM.
DO NOT OPERATE THE LEVELING SYSTEM OR USE THE DUMP OR RAISE BUTTONS IF THE VEHICLE IS MOVING
IN EXCESS OF 5 MPH.
KEEP ALL PEOPLE CLEAR OF VEHICLE WHILE LEVELING SYSTEM AND ROOM EXTENSION ARE BEING OPERATED.
HOW TO OBTAIN WARRANTY SERVICE
THIS IS NOT TO BE INTERPRETED AS A STATEMENT OF WARRANTY
HWH CORPORATION strives to maintain the highest level of
customer satisfaction. Therefore, if you discover a defect or
problem, please do the following:
[phone] OR [phone]. Give your name and
coach was purchased, or the date of system installation,
Notify the dealership where you purchased the
vehicle or had the leveling system installed. Dealership
management people are in the best position to resolve
the problem quickly. If the dealer has difficulty solving
the problem, he should immediately contact the Customer
Service Department, at HWH CORPORATION.
If your dealer cannot or will not solve the problem,
notify the Customer Service Department:
HWH CORPORATION 2096 Moscow Rd. Moscow IA. 52760
address, coach manufacturer and model year, date the
SECOND:
FIRST:
authorization of an independent service facility, to be
defective part, either by appointment at the factory or by the
CORPORATION will authorize repair or replacement of the
determine whether or not your claim is valid. If it is, HWH
HWH CORPORATION personnel will contact you to
during business hours (8:00 a.m. till 5:00 p.m. c.s.t.).
description of the problem, and where you can be reached
determined by HWH CORPORATION. All warranty repairs
must be performed by an independent service facility
authorized by HWH CORPORATION, or at the
HWH CORPORATION factory, unless prior written approval
has been obtained from proper HWH CORPORATION
personnel.

CONTROL IDENTIFICATION
MP25.3507
18MAR97
"EXCESS SLOPE"
LIGHT "NOT IN PARK" LIGHT
HYDRAULIC OPERATION
LIGHT
"LEVEL HYD" BUTTON
"STORE" BUTTON
"DUMP" BUTTON
"OFF" BUTTON
"TRAVEL"
LIGHT
LOWER FRONT BUTTON
RAISE FRONT BUTTON
WARNING LIGHTS
(4-Red)
RAISE RIGHT SIDE BUTTON
LOWER RIGHT SIDE BUTTON
LEVELING LIGHTS
(4-Yellow)
RAISE REAR BUTTON
LOWER REAR BUTTON
STORE LIGHT
RAISE LEFT SIDE
BUTTON LOWER LEFT SIDE BUTTON
CONTROL FUNCTIONS
CONTROL BUTTONS
SLOPE
EXCESS
NOT IN
PARK/
BRAKE
TRAVEL
CAUTION!
COMPUTERIZED LEVELING
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
OFF RAISE
STORE DUMP
LEVEL
HYD AIR
"RAISE" BUTTON
RAISE LIGHT
"LEVEL AIR" BUTTON
AIR OPERATION LIGHT DUMP
LIGHT
IMPORTANT:
or air operation.
tract the jacks into the STORE/TRAVEL position.
by exhausting air from the suspension system.
by adding air to the suspension system.
INDICATOR LIGHTS
LOWER BUTTONS (DOWN ARROWS):
AIR OPERATION LIGHT:
HYDRAULIC OPERATION LIGHT:
STORE LIGHT:
RAISE LIGHT:
DUMP LIGHT:
"OFF" BUTTON:
"LEVEL HYD" BUTTON:
"STORE"BUTTON:
"LEVEL AIR" BUTTON:
"DUMP" BUTTON:
"RAISE" BUTTON:
RAISE BUTTONS (UP ARROW):
Push the "OFF" button to stop the hydraulic
This button is used to automatically re-
This button will lower the whole vehicle
This button will raise the whole vehicle
in the AIR LEVELING mode.
system is in the HYDRAULIC LEVELING mode.
is pushed.
is pushed.
This is the on and automatic oper-
ation button for hydraulic leveling.
ation button for air leveling.
This light will flash indicating the hydraulic
system is in the STORE mode.
READ "DUMP" AND "RAISE" FUNCTIONS
SECTION CAREFULLY.
These are momen-
tary buttons used for manually operating the air or hydraulic
leveling systems. Sides or ends of the vehicle will raise while
these buttons are pushed.
This light indicates the
This light indicates the system is
This light will flash when the "DUMP" button
This light will flash when the "RAISE" button
These momentary buttons
are used for manually operating the air or hydraulic leveling
systems. Sides or ends of the vehicle will raise while these
buttons are pushed.
This is the on and automatic oper-

CONTROL IDENTIFICATION
MP25.4540
21FEB97
CONTROL FUNCTIONS (CONT’D)
INDICATORS (CONT’D)
if the leveling system can NOT level the vehicle.
CAUTION: IT IS THE OPERATOR’S RESPONSIBILITY
TO CHECK THAT ALL JACKS ARE IN THE STORE/TRAVEL
POSITION AND THE AIR SUSPENSION IS AT THE PROPER
TRAVEL HEIGHT.
the "AIR" or "HYD" button is being pushed and the park brake
is not set, provided the ignition is in the "ON" position.
inches or more, the respective red WARNING light will be on,
if the HYDRAULIC OPERATION indicator light is on. If the
AIR OPERATION indicator light is on and the ignition is in the
"ON" position all four red WARNING lights will be on. The vehicle
should not be moved if a red WARNING light is on.
indicator lights. A lit LEVEL indicator light indicates a side
or end of the vehicle is low. These lights can be on only if the
AIR or HYDRAULIC indicator lights are on. Only one or two
LEVEL indicator lights can be on at once. When all LEVEL
indicator lights are out the vehicle is level.
is in the "ON" position and a jack is extended 2 inches or more,
or if a suspension air bag has low air pressure. The vehicle
should NOT be moved if this light is on.
in the "ON" position and a jack is extended 2 inches or more,
or if a suspension air bag has low air pressure. The vehicle
should not be moved if the buzzer is on.
nition is "ON" and there are no red WARNING lights.
"EXCESS SLOPE" INDICATOR LIGHT:
"TRAVEL" INDICATOR LIGHT:
"NOT IN PARK" INDICATOR LIGHT:
WARNING INDICATOR LIGHTS:
LEVEL INDICATOR LIGHTS :
MASTER WARNING LIGHT :
WARNING BUZZER :
This light will be on
This light will be on if the ig-
This light will be on if
When a jack is extended 2
There are four yellow LEVEL
This light will be on if the ignition
The buzzer will sound if the ignition is

OPERATING PROCEDURES
MP35.4507
28APR98
GENERAL INSTRUCTIONS
If parking on soft ground or asphalt paving, pads should be
placed under the jacks for hydraulic leveling.
Press the "OFF" button at any time to stop the operation of the
system
may return to travel height.
If the ignition is in the "ON" position and the park brake is not
set, the "NOT IN PARK/BRAKE" light will come on, and the
system will not turn on when either the "AIR" or "HYD" button
is pressed. If the ignition is in the "ON" position, either air or
hydraulic leveling will be stopped anytime the park brake is
released. The system will shut off and the vehicle suspension
system will return to travel height.
Air and hydraulic leveling can not be used simultaneously.
The "DUMP" and "RAISE" buttons will function with the system
and park brake off if the ignition is in the "ON" position. See
AIR DUMP AND RAISE FUNCTIONS.
The MASTER WARNING light and buzzer will be on if a jack
is extended two inches or more or if an air bag has low air
pressure if the ignition is in the "ON" position.
CAUTION: DO NOT MOVE THE VEHICLE IF A
PREPARATION FOR TRAVEL
Start the vehicle’s engine and allow air pressure to build to
recommended level for traveling.
Visually check that the jacks are in the STORE/TRAVEL position.
Also check that the vehicle’s suspension is at the proper height
for travel.
Before traveling, the MASTER WARNING light and buzzer
must be off.
HYDRAULIC OPERATION
"ON" or "ACC" position. When the leveling system is off and
the ignition is in the "ON" position, the vehicles suspension
can return to travel height.
1. Place the transmission in the recommended position for
parking the vehicle and set the park brake.
2. At this time, the operator may want to check the jacks and
place pads under the jacks if the ground will not support the
vehicle on the jacks.
3. Turn the ignition to the "ACC" position.
4. Press the "HYD" button to enter the hydraulic operation mode.
The HYDRAULIC OPERATION indicator light will glow steady.
5. Press the "HYD" button a second time. The HYDRAULIC
OPERATION indicator light will start to flash. The system will
begin to dump air from the vehicle’s suspension. After approx-
imately 25 seconds the system will automatically extend the
jacks to level the vehicle and then extend any remaining jacks
until they touch the ground. After the system has finished
leveling and stabilizing, and has completed the air dump cycle,
it will automatically shut off.
The panel will stay on 45 seconds regardless of the time taken
to level the vehicle.
EXCESS SLOPE SITUATION: In the event that the jacks are
unable to level the vehicle, the "EXCESS SLOPE" indicator
light will come on. The pump will shut off. One or two yellow
LEVELING indicator lights will remain on. The HYDRAULIC
OPERATION indicator light will continue to flash for 2 minutes,
then the system will shut off. The system will not stabilize the
vehicle if the "EXCESS SLOPE" light comes on. Store the
jacks according to the JACK RETRACTION Section. Move
the vehicle to a more level position or level the vehicle as close
as possible according to the MANUAL HYDRAULIC OPERATION
6. Turn the ignition switch to the "OFF" position.
CAUTION:
Section.
AUTOMATIC HYDRAULIC LEVELING
NOTE: If the ignition switch is "ON" the vehicle’s air suspension
NOTE: Hydraulic leveling can be used with the ignition in the
NOTE: Air will continue to dump during the leveling process.
DO NOT MOVE THE VEHICLE WHILE THE
LEVELING JACKS ARE STILL IN CONTACT WITH THE
GROUND OR IN THE EXTEND POSITION. THIS VEHICLE
IS EQUIPPED WITH STRAIGHT-ACTING JACKS. MOVING
THE VEHICLE WITH THE LEVELING JACKS EXTENDED
CAN CAUSE SEVERE DAMAGE TO THE JACKS AND OR
THE VEHICLE AND CREATE A DRIVING HAZARD. DO NOT
RELY SOLELY UPON WARNING LIGHTS. IT IS THE OPER-
ATOR’S RESPONSIBILITY TO CHECK THAT ALL JACKS ARE
FULLY RETRACTED INTO THE STORE POSITION.
IT IS THE OPERATOR’S RESPONSIBILITY TO
CHECK THAT THE VEHICLE IS AT THE PROPER RIDE HEIGHT
Check that the room extension is fully retracted.
The "TRAVEL" light on the leveling panel must be on.
EXTENSION IS EXTENDED.
WARNING LIGHT OR BUZZER IS ON, OR IF THE ROOM
CAUTION:
BEFORE TRAVELING.
Read room operating procedures before operating any rooms.

OPERATING PROCEDURES
MP35.4512
19MAY97
CAUTION:
IMPORTANT:
JACK RETRACTION
THE OPERATOR MUST BE SURE THERE
ARE NO OBJECTS UNDER THE VEHICLE AND THAT ALL
PEOPLE ARE CLEAR OF THE VEHICLE.
2. Press the "HYD" button one time. The HYDRAULIC OPER-
ATION indicator light will glow steady.
3. Press the "STORE" button. The STORE indicator light will
flash. For ten seconds air will be pumped into the air bags, then
the jacks will start retracting. The vehicle can be moved as
soon as the WARNING indicators are off, the green "TRAVEL"
light is on and the vehicle has returned to the proper travel
height, providing the jacks are in the STORE/TRAVEL position.
DO NOT interrupt power to the leveling system
while the STORE indicator light is blinking. DO NOT push the
"OFF" button. The system must be allowed to completely finish
the STORE mode. The park brake may be removed and the
vehicle may be moved when the jacks are in the STORE/
TRAVEL position. This will not interrupt the store procedure.
4. The system will automatically shut down six minutes after
the four individual red WARNING lights are out. If any one of
the red WARNING light does not go out the system will contin-
ue to store for 30 minutes, then shut down regardless of
the WARNING lights condition.
5. Turn the ignition to "OFF" or proceed to travel.
see MANUAL JACK RETRACTION Section.
JACK POSITIONS
MANUAL HYDRAULIC OPERATION
1. Place the transmission in the recommended position for
parking the vehicle and set the park brake. Turn the ignition
to the "ACC" position.
system is off, the vehicle may return to travel height.
2. Press the "HYD" button. The indicator light will glow steady.
Place pads under the jack feet if the ground will not support
the vehicle on the jacks.
3. Press and hold the "DUMP" button until all the air is exhausted
from the suspension air bags.
4. The vehicle may be leveled using the manual RAISE buttons
(up arrows) on the right half of the panel. If a yellow LEVEL
sensing light is on, that side or end of the vehicle is low. Level
the vehicle from side to side before doing front to rear leveling.
Jacks will extend (or retract) in pairs to raise (or lower) a side
or end of the vehicle. When a jack is extended approximately
two inches or more the respective red WARNING light will
come on.
5. After leveling is complete, any jack not used for leveling can
be extended to the ground. Use the front or rear up arrows
as needed. Do not use the side arrows. This provides addi-
tional stability against wind and activity in the vehicle.
6. Push the "OFF" button and turn the ignition switch to the
"OFF" position.
CAUTION: DO NOT MOVE THE VEHICLE WHILE THE
LEVELING JACKS ARE STILL IN CONTACT WITH THE
GROUND OR IN THE EXTEND POSITION. THIS VEHICLE
IS EQUIPPED WITH STRAIGHT-ACTING JACKS. MOVING
THE VEHICLE WITH THE LEVELING JACKS EXTENDED
CAN CAUSE SEVERE DAMAGE TO THE JACKS AND OR
THE VEHICLE AND CREATE A DRIVING HAZARD. DO NOT
RELY SOLELY UPON WARNING LIGHTS. IT IS THE OPER-
ATOR’S RESPONSIBILITY TO CHECK THAT ALL JACKS ARE
FULLY RETRACTED INTO THE STORE POSITION.
NOTE : If jacks can not be retracted by the above procedure
NOTE : If the ignition is in the "ON" position and the leveling
HYDRAULIC OPERATION (Cont’d)
1. Start the vehicle engine to build air pressure. Immediately
start the retract procedure.
EXTEND POSTION STORE/TRAVEL POSITION

OPERATING PROCEDURES
MP35.4517
28APR98
CAUTION:
MANUAL JACK RETRACTION
KEEP AWAY FROM THE WHEELS, DO
NOT CRAWL UNDER THE VEHICLE, KEEP A SAFE DISTANCE
IN FRONT AND REAR OF VEHICLE. THE VEHICLE MAY
DROP AND/OR MOVE FORWARD OR BACKWARD WITH-
OUT WARNING AS THE VALVE RELEASE IS OPERATED.
if the "STORE" button on the control panel will not retract the
jacks for travel.
1. Locate the 4 valve release "T" handles on the solenoid valves.
The solenoid valves are located on the valve manifold assembly.
2. Allow clearance for vehicle to lower.
4. Retract the rear jacks by opening the two outer valves as
described in Step 3.
5. Check that all four jacks are now retracted.
6. Close the valves by turning the release handles clockwise.
Once the internal spring tension has been released, the handles
will turn free for several turns. Once the "T" handles are snug,
DO NOT tighten the handles past this point as internal damage
may occur to the solenoid.
7. The system should now be repaired before using again.
AIR OPERATION
AUTOMATIC AIR OPERATION
1. Place the transmission in the proper position for parking and
set the park brake. Air leveling will operate with the ignition
key in any position. Running the vehicle engine during air
leveling is recommended. This will provide a better air supply
for leveling. The vehicle will level with the engine shut off,
however more time will be required for leveling.
will not turn on if the park brake is not set. The "NOT IN PARK/
BRAKE" light will come on while the "AIR" button is being
pushed.
2. Press the "AIR" button once to enter the air mode. The AIR
OPERATION indicator light will glow steady. If the ignition is
in the "ON" position, the four red WARNING lights on the panel
will come on. This indicates that the height control valves have
have been locked out. The vehicle should not be moved when
these lights are on.
3. Press the "AIR" button a second time. The AIR OPERATION
indicator light will start flashing and air leveling will begin. The
system will attempt to level the vehicle by exhausting air from
the air bags. If a level position is not achieved by lowering the
vehicle, the low side and/or end of the vehicle will be raised by
adding air to the air bags. When all four LEVEL SENSING lights
SENSING lights on when air leveling is started, the AIR OPER-
ATION indicator light will flash for 3 seconds and then will be
are out the leveling is complete. The AIR OPERATION indicator
light will stop flashing, but will remain on. If there are no LEVEL
steady.
When the AIR OPERATION indicator light is on steady, the
processor will be in a sleep mode for 30 minutes. The light
will remain on. The vehicle’s engine may now be turned off.
After 30 minutes the processor will recheck the level indicators.
If a level indicator is observed for 1 minute, the AIR OPERA-
TION indicator light will start flashing and the system will level
the vehicle and return to the SLEEP MODE. This will continue
until the system is turned off by pushing the "OFF" button or by
releasing the park brake if the ignition is in the "ON" position.
EXCESS SLOPE: The system will attempt to level the vehicle
for 15 minutes. After 15 minutes, if a LEVEL SENSING light
is still on, the "EXCESS SLOPE" light will come on. The AIR
OPERATION indicator light will be on steady, but the system
will not go into the SLEEP MODE. Turn the system off.
and the panel is off, the vehicle may return to travel height.
NOTE: Use the valve release "T" handles for retracting only
NOTE: If the ignition key is in the "ON" position, the panel
NOTE: At any time the ignition switch is in the "ON" position
3. Retract the front jacks by opening the two center valves.
Slowly turn the "T" handles counter clockwise. The handles
may turn easily at first but as an internal spring is compressed,
turning may become more difficult. The valves need only to
be opened enough to retract the jack.
HYDRAULIC OPERATION (Cont’d)

OPERATING PROCEDURES
MP35.4585
12MAR98
MANUAL AIR OPERATION
not turn on if the park brake is not set. The "NOT IN PARK/
BRAKE" light will come on while the "AIR" button is being
pushed.
2. Press the "AIR" button once to enter the air mode. The AIR
OPERATION indicator light will glow steady. If the ignition is
in the "ON" position, the four red WARNING lights on the panel
will come on. This indicates that the height control valves have
have been locked out. The vehicle should not be moved when
these lights are on.
3. The vehicle can now be leveled using the RAISE (up arrow)
and LOWER (down arrow) buttons on the right of half of the
panel in conjunction with the yellow LEVEL indicator lights. Any
side to side leveling should be done before leveling the vehicle
front to rear. Try leveling the vehicle by lowering the opposite
side or end. If a level position is not achieved use the RAISE
manually leveling the vehicle with air, the system will shut off
after the button is released.
4. Turn the ignition to the "OFF" position.
5.Turn the system off.
(DUMP) AND (RAISE) FUNCTIONS
The "DUMP" and "RAISE" functions are provided for operator
convenience for purposes such as dumping the air suspension
when parked in the wind, or raising or lowering the vehicle to
avoid an obstacle.
IMPORTANT: The "DUMP" and "RAISE" features are momen-
tary functions. The vehicle will raise or lower only while the
buttons are being pushed. If the ignition is in the "ON" position,
the suspension will return to travel height when the "DUMP"
or "RAISE" button is released.
CAUTION:
IMPORTANT:
REREAD CAUTIONS ON THE FIRST PAGE
OF THIS MANUAL. THE VEHICLE MAY DROP OR RAISE
AND/OR MOVE FORWARD OR BACKWARD WITHOUT
WARNING CAUSING INJURY OR DEATH.
DO NOT operate the vehicle over 5 M.P.H.
unless the air suspension is at the proper height for travel.
The "DUMP" and "RAISE" buttons will operate with the ignition
switch in any position, "ON", "OFF" or "ACC". The park brake
does not have to be set. The "RAISE" button will not operate
if the system is in the hydraulic mode. (See MANUAL HY-
DRAULIC OPERATION) If the system is in the air mode and
the "RAISE" or "DUMP" button is pushed, the system will shut
off when the button is released.
If desired for clearing an obstacle the vehicle may be moved
while in the "RAISE" or "DUMP" mode.
Remember, the vehicle will return to travel height when the
"RAISE" or "DUMP" button is released.
DO NOT operate the vehicle over 5 M.P.H. or for extended
distances unless the air suspension is at the proper height
for travel.
(up arrow) button to raise the low side or end. The yellow
LEVEL indicator light indicates that side or end is low. When
all yellow lights are out the vehicle is level.
AIR OPERATION (Cont’d)
NOTE: If the ignition key is in the "ON" position the panel will
NOTE: If the "DUMP" or "RAISE" buttons are pushed while
1. Place the transmission in the proper position for parking and
set the park brake. The ignition key must be in the "ON" posi-
tion to turn Air Leveling on. After the system is on, the ignition
key can be turned to the "OFF" or "ACC" position without inter-
rupting air leveling. Running the vehicle engine during air level-
ing is recommended. This will provide a better air supply for
leveling. The vehicle will level with the engine shut off, however
more time will be required for leveling.

MP45.4520
30JAN01
MAINTENANCE
UNUSUAL CONDITIONS
OIL LEVEL
ELECTRICAL SYSTEM
OPERATIONAL CHECK
Review the JACK RETRACTION Section.
FLUID: HWH Specialty Hydraulic Oil is recommended. In an
brake fluid or hydraulic jack fluid. Use of these can damage
and can cause staining should a leak occur. DO NOT USE
Dexron automatic transmission fluid contains red dye
emergency Dexron automatic transmission fluid can be used.
seals.
NOTE:
It is important that the four leveling jacks and all room
extensions are fully retracted before checking the hydraulic
oil level. To check the oil supply, remove the breather cap
from the top of the hydraulic oil reservoir. The oil level
should be approximately one inch below the top of the
reservoir when adequately filled.
The batteries should be in good condition and fully charged.
Weak batteries can cause erratic operation. Battery cable
terminals and battery posts and connections should be kept
clean.
In wet or icy weather leveling jacks may become encrusted
with ice. This may cause the leveling system to function
improperly. To eliminate this problem, periodically check the
leveling jacks and break loose any ice which may be
causing improper operation.
If driving conditions are unusually muddy, the jacks may
become caked or clogged with mud. This condition may
hamper the proper operation of the leveling system. This
problem may be prevented or remedied by cleaning off each
leveling jack if they become excessively muddy.
All electrical connections, especially ground connections,
should be clean, tight, free from corrosion and protected
from weathering.
Do not move the vehicle while the leveling jacks are still in
contact with the ground. Place the store levers in the store
position and then visually check to see if the leveling jacks
have returned to the STORE/TRAVEL position.
NOTE : All major components of the system can be replaced
with rebuilt jacks or can be sent to HWH CORPORATION to
be rebuilt, when the system is out of warranty.
Review the operator manual and run the system in the
automatic and manual mode. Note any abnormal
operation.
Check that all lights work according to the INDICATOR
LIGHT section. Correct function of the four red WARNING
lights is essential to the correct operation of the system.
Check that the vehicle is level when all the yellow LEVEL
indicator lights are out.
NOTE : The level sensing unit has an accuracy tolerance of
+ or - 1 inch side to side, and + or - 5.4 inches front to rear
on a 36 foot vehicle.
If the red LOW BATTERY indicator light comes on, the
electrical system should be checked. If the light comes on,
the operation of the system is not interrupted, but low
voltage can cause erratic operation or damage components.
Contact your dealer or HWH CORPORATION for
assistance.
Check the air system by using the manual "DUMP" or
"RAISE" buttons. If the system will not dump air, raise the
vehicle or return to the proper travel height, contact your
dealer or HWH CORPORATION.
Make sure the jacks will fully retract to the store position.
Jacks should not interfere with any part of the vehicle when
in the store position.
With the jacks extended, check that the jacks can be
retracted using the "T" handles on the solenoid valves.
Refer to the MANUAL JACK RETRACTION Section.

MP45.4525
12JUN97
MAINTENANCE
"NOT IN PARK/BRAKE" CHECK
LEVEL SENSING UNIT ADJUSTMENT
SURFACE
MOUNTING
BELOW THE SURFACE MOUNTING
SCREWS
REAR
THIS
SIDE
ON TOP
STICKER
UP
LEVEL SENSING UNIT
SPRINGS
CAUTION: WHEN MAKING THIS CHECK, BLOCK
THE VEHICLES WHEELS SECURELY SO THE VEHICLE
CANNOT ROLL FORWARD OR BACKWARD.
problem or if there are other problems or questions, con-
sult a qualified RV repair center, your vehicle or coach manufac-
Set the park brake. Switch the ignition to the "ON" position.
Press the "HYD" button one time. Release the parking brake
and confirm that the "NOT IN PARK/BRAKE" indicator light
comes on. Reset the parking brake. The "NOT IN PARK/
BRAKE" indicator light should go out. Switch the ignition to
"OFF".
(3 USED) (3 USED)
NOTE : If any of the above checks or inspections reveal a
turer, or HWH CORPORATION (1-800-321-3494) for service or repair.
Level the vehicle by placing a circular bubble level in the center
of the freezer floor or location within the vehicle that is to be
level. With the vehicle level, adjust the sensing unit until all
yellow lights are off. This is done by drawing up the corres-
ponding screw if the sensing unit is mounted below the surface,
as shown, or backing out the corresponding screw if the sens-
ing unit is mounted above the surface. Bump the sensing unit
to see that it has settled down in the level position.

FRONT
"T" HANDLES
VALVE RELEASE
PUMP/MANIFOLD
ASSEMBLY
NOTE: BEFORE OPERATING VALVE RELEASE
"T" HANDLES, READ AND UNDERSTAND
PROCEDURE FOR MANUAL JACK RETRACTION
IN OPERATOR’S INSTRUCTIONS.
HYDRAULIC LINE CONNECTION DIAGRAM
LEVELING SYSTEM
RF
RR
LF
LR
SHUTTLE
VALVE
MANIFOLD FITTING
MP65.0
18JUN01
VELOCITY VALVE
CHECK VALVE CAPS (4)
NOTE: SOME MANIFOLDS ARE
EQUIPPED WITH VELOCITY VALVES

12 VOLT D.C.
HYDRAULIC
POWER UNIT
M
RELIEF VALVE
RETURN PRESSURE
SOLENOID MANIFOLD
ASSEMBLY
CHECK
VALVE
INNER
CHECK
VALVE
OUTER
SOL.VALVE
LR SOL.VALVE SOL.VALVE SOL.VALVE
RF RRLF
PRESSURE/RETURN
SHUTTLE VALVE 3000 PSI
SWITCH
JACK
PRESSURE
SWITCH
JACK
CYLINDER
LEFT REAR RIGHT REAR
RIGHT
FRONT
LEFT
FRONT
HYDRAULIC SCHEMATIC
BI-AXIS LEVELING WITH STRAIGHT-ACTING JACKS
MP65.4525
15MAY97

NORMALLY OPEN AIR SOLENOID (2)
COMPRESSOR DIAGRAM
12 VOLT RELAY (1)
AIR FILTER
(OPEN AT 90 PSI)
(CLOSED AT 60 PSI)
NORMALLY CLOSED
PRESSURE SWITCH (4)
28JUN99
MP75.4512
AIR LINE TO SUSPENSION
POWER
BATTERY
15 AMP
CHECK VALVE
TO SUSPENSION
BROWN COMPRESSOR
HARNESS FROM
CONTROL BOX
FLOW
GROUND
RELIEF VALVE (3)
(110 PSI)
TO +12
SWITCH PROVIDED
BY CUSTOMER
+12 CONTROL WIRE
FROM COACH
BATTERY
The control box sends a +12 signal to the 12 Volt Relay (1) whenever a raise function is needed in automatic or manual leveling.
The compressor will run and the normally open air solenoid (2) will close allowing the compressor to build pressure. When the
pressure builds to 110 psi the relief valve (3) will open and the compressor will continue to run.
affect the operation of the leveling system. During auxiliary operation of the compressor, when pressure builds to 90 psi the
pressure switch will open, stopping the compressor. The air solenoid (2) will be open whenever the compressor is not running.
This releases internal pressure from the compressor.
The pressure switch (4) will not

RAISE
TRAVEL
LOWER
LOWER
TRAVEL
RAISE
PRESS SW
PRESS SW
TRAVEL SOLENOID
VALVE (2) RIGHT & LEFT
LOWER SOLENOID
VALVE (2) RIGHT& LEFT
RAISE SOLENOID
VALVE (2) RIGHT & LEFT
MOUNTING HOLES
LINE FROM HEIGHT
CONTROL VALVE (2 MAY BE
TEE’D TOGETHER IF ONE
HCV IS USED)
PRESSURE SWITCH (2)
EXHAUSTS PORT (2)
LINE TO AIR BAGS
(2-LEFT & RIGHT)
AIR SUPPLY (1)
CHECK VALVE (2)
MP75.4515
21APR97
AIR SOLENOID MANIFOLD
6 VALVE WITH TWO PRESSURE SWITCHES
CONTROL VALVE
LINE FROM HEIGHT
PRESSURE SWITCH
CHECK VALVE
AIR SUPPLY
LINE TO AIR BAGS
REAR VIEW
SIDE VIEW
LINE TO AIR BAGS
LINE TO AIR BAGS
(2-LEFT & RIGHT)
3.400"

FRONT
CV
HEIGHT CONTROL
VALVE (3 PLACES)
V
C
COMPRESSOR
FRONT MANIFOLD
AIR BAG
CV
AIR LINE CONNECTION DIAGRAM
REAR MANIFOLD
LINE FROM HEIGHT
CONTROL VALVE
LINE TO AIR BAGS
AIR
SUPPLY
SUSPENSION
TANK
MP75.4560
24JUL97

EXH
EXHEXH
EXH EXH
FRONT MANIFOLD ASSEMBLY
AIR
BAG
AIR
BAG
AIR
BAG AIR
BAG
REAR MANIFOLD ASSEMBLY
EXHEXH
FRONT HEIGHT
CONTROL VALVE
RR HCVLR HCV
(HCV)
TRAV.
LOWER
RAISE
TRAV.
LOWER
RAISE
TRAV.
LOWER
RAISE
TRAV.
LOWER
RAISE
4-POINT LEVELING W/AIR COMPRESSOR
PRESSURE SWITCHES FRONT AND REAR
RAISE
LOWER
TRAV.
RAISE
LOWER
TRAV.
EXH EXH
BAG
AIR BAG
AIR
AIR
BAG BAG
AIR
BAG
AIR BAG
AIR
AIR LEVEL SCHEMATIC
COMPRESSOR
SCHEMATIC
SEE AIR
SUSPENSION
TANK
MP75.4565
06AUG99

SEE CONTROL
BOX DIAGRAM
SENSING
ELECTRICAL CONNECTION
AIR LEVELING SYSTEM
(WITH TOUCH PANEL CONTROL AND HYDRAULIC LEVELING)
MP85.2905
28MAY99
PARK BRAKE
PIGTAIL - (BLUE) 9000
TO BRAKE LIGHT
ON DASH PARK BRAKE SWITCH
UNIT
MODULAR
CABLE
TOUCH PANEL
GROUND STUD
FRONT AIR
MANIFOLD
SEE AIR SOLENOID
MANIFOLD DIAGRAM
SEE AIR SOLENOID
MANIFOLD DIAGRAM
POWER
HARNESS
REAR AIR MANIFOLD
HARNESS
HARNESS
TO MASTER
WARNING
INDICATORS
GROUND
STUD
FRAME
RAIL
3/8" INT STAR
LOCKWASHERS (4)
TO AUX. AIR COMPRESSOR
SEE AIR COMPRESSOR
DIAGRAM -
(BROWN) 9700
#10 - (WHITE) 6230
FROM POWER HARNESS -
(PURPLE) 7699
TRAVEL -
(GRAY) 1700
LF AIR PRESS.
SW. - (BLACK) 1210
LF LOWER -
(RED) 1600
LF RAISE -
(GREEN) 1500
RF AIR PRESSURE
SWITCH - (ORANGE) 2210
RF LOWER - (BLUE) 2600
RF RAISE - (YELLOW) 2500
BATT. -
(RED) 6100
IGN. -
(YELLOW) 6110
ACC. -
(BROWN) 6120
TRAVEL -
(GRAY) 1700
TRAVEL - (GRAY) 3700
REAR PRESS. SW. -
(YELLOW) 3215
LR LOWER -
(PURPLE) 4600
LR RAISE -
(GREEN) 4500
TRAVEL - (GRAY) 3700
REAR PRESS. SW. -
(YELLOW) 3215
RR LOWER -
(BROWN) 3600
RR RAISE -
(ORANGE) 3500
NOTE:THE FOUR DIGIT WIRE NUMBER
SUPERSEDES ANY AND ALL WIRE COLORS.
DUMP
LEVEL
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
CAUTION!
OFF
NOT IN
TRAVEL
EXCESS
SLOPE
PARK/
BRAKE
RAISE
AIR
COMPUTERIZED LEVELING
HYD
STORE

SEE CONTROL
BOX CONNECTION
ELECTRICAL CONNECTION DIAGRAM
HYDRAULIC LEVELING SYSTEM
(WITH TOUCH PANEL CONTROL AND AIR LEVELING)
MP85.2910
28MAY99
GROUND
STUD
LR RR
SWITCH
WARNING
WARNING
SWITCH
RF
LF
SWITCH
WARNING
AB
SWITCH
SWITCH
SWITCH
HARNESS
WARNING
PRESSURE
WARNING
JACK WARNING/PRESSURE
SWITCH CONNECTION
HYDRAULIC
MANIFOLD
HARNESS
DIAGRAM
WHITE
#10 TO BE FIRST
WIRE ON GROUND
STUD - (WHITE) 6230
JACK
WARNING
SWITCH
HARNESS
AB
AB
(WHITE)
(GREEN) 4000 (WHITE) (BLACK) 3000
AB
AB
TOP VIEW
(RED) 2000
(WHITE) 6235
(WHITE)
6235
(YELLOW)
1000
HYDRAULIC MANIFOLD
WIRING DIAGRAM
MASTER AND PUMP
RELAY WIRING DIAGRAM
POWER UNIT HARNESS
GROUNDING INSTRUCTIONS
NOTE: THE (4) DIGIT WIRE NUMBER
SUPERSEDES ANY AND ALL WIRE
COLORS.
6235
6235

WHITE-(GROUND)
YELLOW-LEFT SIDE
BLACK-FRONT
GREEN-RIGHT SIDE
RED-REAR
PARK
BRAKE
POWER
HARNESS
REAR AIR HARNESS
600 SERIES HYDRAULIC LEVELING/4-POINT AIR LEVELING
MP85.4514
16MAR99
15
15
15
15
15
15
15
15
5
5
5
5
5
5
5
5
5
7.5
COMPRESSOR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
3 BATTERY
4 IGNITION
5 ACC
6 RIGHT REAR LOWER
7 LEFT REAR LOWER
8 LEFT REAR RAISE
9 RIGHT REAR RAISE
10 LEFT FRONT RAISE
11 LEFT FRONT LOWER
12 TRAVEL
13 N/A
14 MASTER RELAY
15 PUMP
16 RIGHT REAR SOLENOID
17 N/A
18 LEFT FRONT SOLENOID
19 RIGHT FRONT SOLENOID
20 LEFT REAR SOLENOID
FUSE DESIGNATION
ESSEX RELAY MOUNTED
ON INSIDE OF BOX
*ATTACH #10 WIRE
FROM PUMP
HARNESS - (BLACK) 6800
NUMBER STICKER
PART: SERIAL NUMBER STICKER
5
5
19
20
1 RIGHT FRONT LOWER
2 RIGHT FRONT RAISE
CONTROL BOX CONNECTION DIAGRAM
LF - (YELLOW) 1000
RF - (RED) 2000
RR - (BLACK) 3000
LR - (GREEN) 4000
JACK WARN.
SW. INPUTS
FROM REAR
AIR HARNESS
LEVEL SENSING
UNIT INPUTS
MASTER WARNING
INDICATOR OUTPUT
FROM POWER
HARNESS -
MODULAR CABLE
FROM TOUCH
PANEL
FRONT AIR HARNESS
HYD MANIFOLD/ PUMP/ MASTER RELAY HARNESS
#10 WHITE WIRE
FROM HYD. HARNESS
GROUND WIRES FROM
FRONT AIR HARNESS (2)
GROUND WIRES FROM
REAR AIR HARNESS (3)
(PURPLE) 7699
PARK BRAKE SENSOR - (BLUE) 9000
LEFT FRONT RAISE - (GREEN) 1500
LEFT FRONT LOWER - (RED) 1600
FRONT TRAVEL - (GRAY) 1700
RIGHT FRONT LOWER - (BLUE) 2600
RIGHT FRONT RAISE - (YELLOW) 2500
BATTERY - (RED) 6100
IGNITION - (YELLOW) 6110
ACCESSORY - (BROWN) 6120
COMPRESSOR - (BROWN) 9700
LEFT REAR RAISE - (GREEN) 4500
LEFT REAR LOWER - (PURPLE) 4600
REAR AIR PRESSURE
SWITCH - (YELLOW) 3215
REAR TRAVEL SOL. - (GRAY) 3700
RIGHT REAR LOWER - (BROWN) 3600
RIGHT REAR RAISE - (ORANGE) 3500
PRESSURE SWITCH INPUTS
FROM FRONT AIR HARNESS
RF AIR PRESS. SW. - (ORANGE) 2210
LF AIR PRESS. SW. - (BLACK) 1210
MASTER RELAY - (RED) 8500
PUMP RELAY - (GRAY) 8600
*#10 BLACK WIRE 6800
MANIFOLD PRESSURE SWITCH -
(BLACK) 8100
RIGHT REAR - (ORANGE)3400
LEFT REAR - (BROWN) 4400
RIGHT FRONT - (GREEN) 2400
LEFT FRONT - (BLUE) 1400
NOTE:THE FOUR DIGIT WIRE NUMBER
SUPERSEDES ANY AND ALL WIRE COLORS.

PRESSURE
SWITCH
3000 PSI
(Front view)
GROUNDING STUD
MP85.4528
(ORANGE) 3400 (GREEN) 2400 (BLUE) 1400 (BROWN) 4400
(BLACK) 8100
WHITE TO
(Rear
view)
RIGHT
REAR RIGHT FRONT LEFT FRONT LEFT REAR
VIEW FROM TANK END
(WHITE) 6240 (WHITE) 6241 (WHITE) 6240 (WHITE) 6241
HYDRAULIC MANIFOLD
WIRING DIAGRAM
FOR 610 SERIES LEVELING SYSTEMS
12MAR99
BA BA
E.D.
P.
BABA
(SEE GROUNDING
INSTRUCTIONS)
D.
E.
P.
D.
E.
P.
D.
E.
P.
NOTE:THE FOUR DIGIT WIRE
NUMBER SUPERSEDES ANY
AND ALL WIRE COLORS.