HWH 610 SERIES User manual

H
CORPORATION
H
W
R
HWH CORPORATION
2096 MOSCOW ROAD
MOSCOW, IOWA 52760
[phone] / [phone]
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
HWH COMPUTERIZED LEVELING
ML16968/MP05.5010
AUTOMATIC PILOT OPERATED SUSPENSION AIR DUMP
STRAIGHT-ACTING JACKS
610 SERIES
LEVELING SYSTEM
INTERNET: http: //www.hwhcorp.com
(ON I-80, EXIT 267 SOUTH)
21MAR01

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
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 PENATRATE SKIN
WEAR SAFETY GLASSES WHEN INSPECTING OR SERVICING THE SYSTEM TO PROTECT EYES FROM DIRT, METAL
MP15.04
30MAY01
KEEP ALL PEOPLE CLEAR OF VEHICLE WHILE LEVELING SYSTEM AND ROOM EXTENSION ARE BEING OPERATED.
IMPORTANT: IF COACH IS EQUIPPED WITH A ROOM EXTENSION, READ ROOM EXTENSION SECTION BEFORE
OPERATING LEVELING SYSTEM.
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
MP25.5205
14NOV01
DUMP
LEVEL
HWH COMPUTERIZED LEVELING
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
EXCESS
SLOPE
NOT IN
PARK
TRAVEL
OFF CAUTION!
STORE
"EXCESS SLOPE"
LIGHT
"NOT IN PARK" LIGHT
LEVEL LIGHT
"LEVEL" BUTTON
"STORE" BUTTON
"DUMP" BUTTON
"OFF" BUTTON
"TRAVEL" LIGHT
LOW BATTERY
LIGHT FRONT RETRACT BUTTON
FRONT EXTEND BUTTON
WARNING LIGHTS (4- Red)
RIGHT SIDE EXTEND BUTTON
RIGHT SIDE RETRACT BUTTON
LEVELING LIGHTS (4- Yellow)
REAR EXTEND BUTTON
REAR RETRACT BUTTON
STORE LIGHT
LEFT SIDE EXTEND BUTTON LEFT SIDE RETRACT BUTTON
"OFF" BUTTON:
operation.
"LEVEL" BUTTON:
"STORE" BUTTON:
"STORE" button. This button is used to automatically retract
the jacks.
"DUMP" BUTTON:
from the vehicle suspension. See MANUAL AIR DUMP Section.
WARNING LIGHTS:
"EXCESS SLOPE" LIGHT:
leveling system cannot level the vehicle.
"NOT IN PARK/BRAKE" LIGHT:
the panel is on and the hand/auto brake is not set.
"TRAVEL" LIGHT:
ignition is on, when the jacks are retracted and there are no
red WARNING lights on.
LOW BATTERY LIGHT:
controller senses low voltage.
MASTER "JACKS DOWN" WARNING LIGHT:
mounted in the dash separate from the touch panel. It will be
on when any one or more jacks are extended and the ignition
is "ON".
BUZZER:
master "JACKS DOWN" warning light is on.
CONTROL FUNCTIONS
INDICATOR LIGHTS
CONTROL BUTTONS
Push the "OFF" button to stop hydraulic
The store indicator light is above the
This is a manual button for dumping air
This indicator will light when the
This indicator will light when
This indicator light will be on when the
This indicator will be on when the
This is a light
This is a jacks down warning. It will sound if the
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.
This is the on button and automatic
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" or
"ACC" position, the system is on, and the jacks are extended
2 or more inches.operation button. The on indicator light is above the
HYD
"HYD" button.

OPERATING PROCEDURES
MP35.5105
28JUL98
GENERAL INSTRUCTIONS
MANUAL AIR DUMP
PREPARATION FOR TRAVEL
If parking on soft ground or asphalt paving, wood blocks or
pads must be placed under the jacks.
Press the "OFF" button and turn the ignition switch "OFF" at
any time to stop the operation of the system.
Any time a hydraulic leveling process is interrupted, retract the
jacks according to the JACK RETRACTION Section and then
restart the leveling process.
If the "LOW BATTERY" indicator is on, the system should be
If the hand/auto brake is not set when the "HYD" button is
pressed, the "NOT IN PARK/BRAKE" light will come on and
the system will not operate.
checked. Battery voltage should be checked, also all connections
should be checked.
Before traveling, the red jack warning lights must be off and
the "TRAVEL" light must be on. If lights are not correct for
travel, retract jack as described in the JACK RETRACTION
Section.
If the jacks are retracted but a red "WARNING" light is lit or the
green "TRAVEL" light is not lit, the system needs to be serviced.
The suspension air bags should be inflated and the vehicle
should be at the proper ride height before traveling.
WARNING LIGHTS. IT IS THE OPERATORS RESPONSIBILITY TO
CHECK THAT ALL JACKS ARE FULLY RETRACTED INTO
CAUTION:
If the jacks cannot be retracted according to the JACK RE-
TRACTION Section, retract the jacks according to the MANUAL
JACK RETRACTION Section. The system should then be
checked.
ROOM EXTENSION PROCEDURES
read this section carefully.
If the vehicle is equipped with kick-down jacks, the wheels MUST
be blocked securely. Do NOT operate any room extension
until the leveling and stabilizing procedure is complete. Do
If the vehicle is equipped with a room extension IMPORTANT:
NOT retract the leveling system until all room extensions are
retracted. NEVER operate the leveling system when any
Refer to the vehicle owners manual for proper operation of
room extensions are extended.
room extensions.
IMPORTANT: Do not use a room extension support when the
vehicle is supported by the leveling system.
DO NOT MOVE THE VEHICLE WHILE THE
LEVELING JACKS ARE STILL IN CONTACT WITH THE GROUND
OR IN THE EXTENDED 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
THE STORE/TRAVEL POSITION AND THE VEHICLE IS AT
THE PROPER RIDE HEIGHT FOR TRAVELING.
CAUTION: DO NOT MOVE THE VEHICLE IF A WARN-
ING LIGHT OR BUZZER IS ON.
The "DUMP" button on the leveling system control panel is used
to manually dump air from the vehicles suspension system. This
will lower the vehicle. The "DUMP" button will work if the igni-
tion is on and the leveling system is off, if the park brake is set.
Push and release the "DUMP" button. This will shift the air valves
into the dump position. The air will completely exhaust from
the suspension air bags.
To return the vehcile to ride height, the ignition must be on and
the park brake must be released.

OPERATING PROCEDURES
MP35.5109
28JUL98
AUTOMATIC HYDRAULIC LEVELING
CAUTION:
IMPORTANT:
1.Place transmission in the recommended position for parking
vehicle and set parking brake. Turn the coach engine off.
Turn the ignition to the "ACCESSORY" position.
2. Press the "HYD" button to enter the hydraulic operation
mode. The "HYD" indicator light will glow steady.
3. 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.
4. Press the "HYD" button a second time. The "HYD" indicator
light will start to flash. The system will begin to dump air from
the vehicle suspension. After approximately 25 seconds, the
system will automatically extend the jacks to level the vehicle
and then extend any remaining jacks until they touch the ground.
EXCESS SLOPE SITUATION: In the event the jacks are unable
to level the coach, the "EXCESS SLOPE" indicator light will
come on. The pump will shut off. One or two yellow leveling
indicator lights will remain on. The "HYD" indicator light will
continue to blink 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 Section.
5. Turn the ignition switch to the "OFF" position.
JACK RETRACTION
THE OPERATOR MUST BE SURE THAT
THERE ARE NO OBJECTS UNDER THE VEHICLE AND THAT
ALL PEOPLE ARE CLEAR OF THE VEHICLE.
DO NOT interrupt power to the leveling system
while the "STORE" indicator light is blinking. DO NOT push
the "OFF" button or turn the ignition key. The system must be
4. If jacks cannot be retracted by the above procedure see
MANUAL JACK RETRACTION Section.
JACK POSITIONS
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 OPERATOR’S RESPONSIBILITY TO
CHECK THAT ALL JACKS ARE FULLY RETRACTED INTO
allowed to completely finish the STORE mode.
2. Press the "STORE" button. The store indicator light will
flash. As each jack retracts, its red WARNING light will go
out. The system will automatically shut down six minutes after
the four individual red "WARNING" lights are out. If any one
red "WARNING light does not go out, the system will continue
to store for thirty minutes, then shut down regardless of the
"WARNING" lights condition.
EXTEND POSITION STORE/TRAVEL POSITION
1. Start the engine to build air pressure in the suspension sys-
tem. Push the "HYD" button and store the jacks immediately.
3. The vehicle can be moved as soon as the red warning lights
THE STORE/TRAVEL POSITION AND THE VEHICLE IS AT
THE PROPER RIDE HEIGHT.
are out, the green "TRAVEL" light is on, and the suspension
air bags are inflated, and the vehicle has returned to the proper
ride height, providing the jacks are in the STORE/TRAVEL pos-
ition.
After the system has finished leveling and stabilizing, it will auto-
matically shut off.
NOTE: When the "STORE" button is pushed, the air valves will
shift to the travel position and the vehicle will begin to return to
ride height.

OPERATING PROCEDURES
MP35.5113
28JUL98
CAUTION:
IMPORTANT:
MANUAL JACK RETRACTION
MANUAL HYDRAULIC OPERATION
off. Turn the ignition to the "ACCESSORY" position.
the vehicle on the jacks.
2. Allow clearance for vehicle to lower.
described in Step 3.
5. Check that all four jacks are now retracted.
7. The system should now be repaired before using again.
NOTE:
1. Place transmission in the recommended position for parking
the vehicle, and set the parking brake. Turn the vehicle engine
2. Press the "I" button. The indicator light will glow steady.
3. Place pads under the jack feet if the ground will not support
5. The vehicle may be leveled using the manual EXTEND but-
tons on the right half of the panel. If a yellow LEVEL sensing
light is on, that side or end of the vehicle is low. Jacks will ex-
tend (or retract) in pairs to raise (or lower) a side or end of the
vehicle. Any jack not used for leveling can be extended to the
ground. This provides additional stability against wind and ac-
tivity in the vehicle.
Do not continue to push a EXTEND button for
more than ten seconds after that pair of jacks are fully extend-
ed.
6. When leveling is completed, push the "OFF" button on the
leveling panel and turn the ignition switch to the "OFF" position.
Use the valve release "T" handles for retracting only
if the "STORE" button on the control panel will not retract the
jacks for travel.
KEEP AWAY FROM THE WHEELS, DO
NOT CRAWL UNDER THE VEHICLE, KEEP A SAFE DIS-
TANCE IN FRONT AND REAR OF VEHICLE. THE VEHI-
CLE MAY DROP AND/OR MOVE FORWARD OR BACK-
WARD WITHOUT WARNING AS THE VALVE RELEASE
IS OPERATED.
1. Locate the 4 valve release "T" handles on the solenoid valves.
The solenoid valves are located on the pump/valve assembly.
3. Retract the rear jacks by opening the two outer valves. Slow-
ly turn the "T" handles counterclockwise. 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.
4. Retract the front jacks by opening the two center valves as
6. Close the valves by turning the release handles clockwise.
Once the internal spring tension has been released, the hand-
les 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.
4. Press the "DUMP" button. The air will exhaust from the sus-
pension system.

MP45.1
29JAN01
MAINTENANCE
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.
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
All major components of the system can be replaced
with rebuilt parts or can be sent to HWH CORPORATION to
be rebuilt, when the system is out of warranty.
UNUSUAL CONDITIONS
It is important that the four leveling jacks are fully retracted
before checking the hydraulic oil level. To check the oil
supply, remove the breather cap from the top of the hydraulic
below the top of the reservoir when adequately filled.
Do not move the vehicle while the leveling jacks are still in
OIL LEVEL
ELECTRICAL SYSTEM
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.
All electrical connections, especially ground connections,
should be clean, tight, free from corrosion and protected
from weathering.
OPERATIONAL CHECK
Review the operator manual and run the system in the
automatic and manual mode. Note any abnormal
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.
The level sensing unit has as 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 dump system by using the manual "DUMP"
button according to the MANUAL AIR DUMP section. If the
system will not dump air or return to the proper ride height,
contact your dealer or HWH CORPORATION.
Review the JACK RETRACTION section.
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.
contact with ground. Retract the jacks according to the
"JACK RETRACTION" section and then visually check to see
if the leveling jacks have returned to the STORE/TRAVEL
NOTE:
NOTE:
oil reservoir. The oil level should be approximately one inch
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:
improper operation.
position.
operation.

MAINTENANCE
"NOT IN PARK/BRAKE" CHECK
LEVEL SENSING UNIT ADJUSTMENT
SURFACE
MOUNTING
BELOW THE SURFACE MOUNTING
SCREWS (3)
REAR
THIS
SIDE
ON TOP
STICKER
UP
LEVEL SENSING UNIT
SPRINGS (3)
CAUTION: WHEN MAKING THIS CHECK, BLOCK
THE VEHICLES WHEELS SECURELY SO THE VEHICLE
CANNOT ROLL FORWARD OR BACKWARD.
reveal a problem or if there are other problems or
questions, consult a qualified RV repair center, your
vehicle or coach manufacturer, or HWH CORPORATION
NOTE: If any of the previous checks or inspections
MP45.5050
20JAN03
Set the park brake. Switch the ignition to "ACCESSORY" or
"ON" position. Press the "I" 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".
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
corresponding screw if the sensing unit is mounted below
Bump the sensing unit to see that it is settled tight against
screw if the sensing unit is mounted above the surface.
the surface as shown or backing out the corresponding
all three screw heads and still indicates that the unit is level.
BELOW THE SURFACE MOUNTING
ELECTRONIC LEVEL SENSING UNIT
MOUNTING SURFACE
FRONT
UP
THIS
SIDE
SPRINGS (3)
SCREWS (3)
for service or repair.

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