HWH 500 Series User manual

H
CORPORATION
H
W
R
FEATURING:
TOUCH PANEL LEVELING CONTROL
HYDRAULIC LEVELING
HWH COMPUTER-CONTROLLED
OPERATOR’S MANUAL
AIR DUMP
STRAIGHT-ACTING JACKS
HYDRAULIC ROOM EXTENSION
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
500 SERIES
LEVELING SYSTEM
16MAR01
ML10731/MP05.3701/CHA-S
SPACEMAKER ROOM EXTENSION SYSTEM
(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
MP25.5205
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.

CONTROL FUNCTIONS
CONTROL IDENTIFICATION
MP25.9402
14JAN97
CAUTION!
CLEAR OF ROOM WHEN OPERATING.
UNDERSTAND OPERATOR’S MANUAL BEFORE
USING. KEEP PEOPLE AND OBSTRUCTIONS RETRACT
EXTEND ROOM CONTROL
SWITCH
KEY SWITCH
KEY SWITCH:
CONTROL SWITCH. When the KEY SWITCH is in the "ON"
position the room can be operated, and the key cannot be
removed. When the KEY SWITCH is in the "OFF" position
the room cannot be operated, and the key can be removed.
is a two position momentary switch. Pressing the switch in
the EXTEND position will extend the room. Pressing the
switch in the RETRACT position will retract the room. Re-
leasing the ROOM CONTROL SWITCH will halt the operation
of the room.
ROOM OPERATOR’S PANEL
KEY
HYDRAULIC ROOM EXTENSION
The KEY SWITCH controls power to the ROOM ROOM CONTROL SWITCH: The ROOM CONTROL SWITCH

OPERATING PROCEDURES
MP35465
25MAY95
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 or 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.
The "DUMP" button is used to manually dump air from the
vehicle’s suspension system. This will lower the vehicle. It
can be used while the vehicle is moving or stationary.
CAUTION: IF DUMPING AIR FROM THE SUSPEN-
SION, THE COACH SHOULD NOT BE MOVING AT A SPEED
GREATER THAN 5 MPH.
The "DUMP" button will work if the ignition is on and the leveling
system is off, or if the leveling system is on.
The "DUMP" button is a momentary button and will dump air
only while the button is being pushed.
IMPORTANT: If the air is not completely exhausted from the
suspension or the vehicles engine is running, the vehicle will
return to the proper travel height when the "DUMP" button is
released.
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 jacks 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 OPERATOR’S RESPONSIBILITY TO
CHECK THAT ALL JACKS ARE FULLY RETRACTED INTO
THE STORE/TRAVEL POSITION.
CAUTION:
If the jacks cannot be retracted according to the JACK
RETRACTION section, retract the jacks according to the
MANUAL JACK RETRACTION section. The system should
then should be checked.
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
CAUTION: DO NOT MOVE THE VEHICLE IF A
WARNING LIGHT OR BUZZER IS ON.
The room extension should be fully retracted before moving
the vehicle.
ROOM EXTENSION PROCEDURES
ate the leveling system when any room extensions are ex-
system until all room extensions are retracted. Do NOT oper-
stabilizing procedure is complete. Do NOT retract the leveling
Do NOT operate any room extension until the leveling and
This vehicle is equipped with a room extension.
Read this section carefully.
tended.
IMPORTANT:
the vehicle is supported by the leveling system.
Do not use a room extension support when
Refer to the vehicle owners manual for proper operation of
IMPORTANT:
room extensions.

OPERATING PROCEDURES
MP35.485
20AUG96
AUTOMATIC HYDRAULIC LEVELING
the vehicle suspension. After approximately 45 seconds, the
light will start to flash. The system will begin to dump air from
4. Press the "HYD" button a second time. The "HYD" indicator
place pads under the jacks if the ground will not support the
3. At this time the operator may want to check the jacks and
mode. The "HYD" indicator light will glow steady.
2. Press the "HYD" button to enter the hydraulic operation
erratic operation and inhibit proper leveling of the vehicle.
Turn the ignition to the "ACCESSORY" position.
vehicle and set parking brake. Turn the coach engine off.
1.Place transmission in the recommended position for parking
vehicle.
5. Turn the ignition switch to the "OFF" position.
the MANUAL HYDRAULIC OPERATION section.
ition or level the vehicle as close as possible according to
RETRACTION section. Move the vehicle to a more level pos-
SLOPE" light comes on. Store the jacks according to the JACK
off. The system will NOT stabilize the vehicle if the "EXCESS
continue to blink for 2 minutes, then the system will shut
indicator lights will remain on. The "HYD" indicator light will
come on. The pump will shut off. One or two yellow leveling
to level the coach the "EXCESS SLOPE" indicator light will
EXCESS SLOPE SITUATION: In the event the jacks are unable
completed the air dump cycle it will automatically shut off.
After the system has finished leveling and stabilizing, and has
and then extend any remaining jacks until they touch the ground.
system will automatically extend the jacks to level the vehicle
OFF
ON
EXTEND
RETRACT
EXTEND
RETRACT
OFF
ON
KEY SWITCH
ON POSITION KEY SWITCH ON POSITION
ROOM EXTEND PROCEDURE
FIGURE 1 FIGURE 2
CAUTION:
OPERATING THE ROOM WITH ANY
ROOM -LOCKING DEVICES LOCKED OR THE MANUAL-
RETRACT WINCH ATTACHED CAN CAUSE PERSONAL
INJURY AND VEHICLE DAMAGE. IT IS THE OPERATOR’S
RESPONSIBILITY TO ENSURE THAT ALL ROOM-LOCKING
DEVICES AND THE MANUAL-RETRACT WINCH ARE DIS-
ENGAGED BEFORE OPERATING THE ROOM.
1. Follow the LEVELING AND STABILIZING PROCEDURE.
2. Unlock all room-locking devices.
room, remove it before extending the room.
CAUTION:
KEEP PEOPLE AND OBSTRUCTIONS
CLEAR OF ROOM WHEN OPERATING.
the room.
3. Turn the ignition switch to ACCESSORY.
4. Press the "HYD" button if the HYDRAULIC OPERATION
5. Turn the KEY SWITCH on the room extension operator’s
panel to the "ON" position. (Figure 1)
light and a WARNING light must be illuminated. The room will
not extend if the system is in automatic leveling or retract.
6. To EXTEND the room, press and hold the ROOM CONTROL
switch in the EXTEND position. When the room is fully ex-
tended, release the ROOM CONTROL switch.
IMPORTANT: Do NOT hold the ROOM CONTROL switch in
the EXTEND position for more than ten seconds after the room
is fully extended. If either side of the room stops moving, re-
lease the ROOM CONTROL SWITCH immediately.
operation of the room.
7. Press the "OFF" button.
8. Turn the KEY SWITCH to the "OFF" position and remove
the key. (See Figure 2)
9. Turn off the ignition switch.
IMPORTANT:
Do NOT use the room extension support
when the vehicle is supported by the leveling system.
IMPORTANT: The park brake must be set and the vehicle
must be leveled using the hydraulic leveling system before
the room can be extended or retracted. If the leveling sys-
tem stopped with the excess slope light on, see "EXCESS
SLOPE SITUATION" under "AUTOMATIC HYDRAULIC
LEVELING". DO NOT EXTEND the room.
NOTE: Running the vehicle engine during leveling can cause
NOTE:
NOTE:
NOTE:
If the MANUAL RETRACT WINCH is attached to the
Make sure there is adequate clearance to fully extend
Releasing the ROOM CONTROL switch will halt the
NOTE: To operate the room, the HYDRAULIC OPERATION
LIGHT is not illuminated. Refer to the CONTROL IDENTI-
FICATION page.

OPERATING PROCEDURES
MP35505
25MAY95
ROOM RETRACT PROCEDURE
CAUTION: KEEP PEOPLE AND OBSTRUCTIONS
CLEAR OF THE ROOM WHEN OPERATING.
1. Turn the igniton switch to ACCESSARY.
2. Press the "HYD" BUTTON.
NOTE: To retract the room the HYDRAULIC OPERATION
LIGHT must be illuminated. A WARNING LIGHT does NOT
need to be on.
4. To retract the room press and hold the ROOM CONTROL
SWITCH in the RETRACT position. When the room is fully
retracted, release the ROOM CONTROL SWITCH.
NOTE: Releasing the ROOM CONTROL SWITCH will halt
the operation of the room.
5. Press the "OFF" Button or let the system continue to STORE.
7. Turn the ignition switch off.
8. Engage all room-locking devices.
9. If the room will not retract see the MANUAL ROOM RE-
TRACT PROCEDURE.
Room-locking devices should be locked while
traveling.
IMPORTANT:
NOTE: The room can be retracted ten seconds after the
Leveling System is put in the STORE mode. This will inter-
rupt the STORE mode unitl the ROOM CONTROL SWITCH
is released. The Leveling System will continue to STORE
starting from the beginning of the program.
IMPORTANT: Do NOT hold the ROOM CONTROL SWITCH
in the RETRACT position for more than ten seconds after the
room is fully retracted. If either side of the room stops moving
3. Turn the KEY SWITCH on the room extension operator’s
panel to the "ON" position. (See Figure 1)
release the CONTROL SWITCH immediately.
6. Turn the KEY SWITCH to the off position and remove the
key. (See Figure 2)
FIGURE 1
RETRACT
ON POSITION
KEY SWITCH
OFF
ON
EXTEND
FIGURE 2
RETRACT
ON POSITION
KEY SWITCH
ON
OFF EXTEND

OPERATING PROCEDURES
MP35535
31MAY95
CAUTION:
IMPORTANT:
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.
STORE/TRAVEL
POSITION
EXTEND
POSITION
FIGURE 3
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 SE-
VERE 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
THE STORE/TRAVEL POSITION.
allowed to completely finish the store mode.
1. Turn the ignition switch to the "ACC" position. Press the
"HYD" button one time. The "HYD" indicator light will glow
steady.
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.
3. Start the vehicle engine and build up air pressure in the
suspension system. The vehicle can be moved as soon as
the red WARNING lights 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 position. (See FIGURE 3)
The front jacks will retract for approximately 5 seconds before
the rear jacks start to retract.
IMPORTANT: Do NOT move the vehicle with the room ex-
tension extended.
1. Locate the 4 valve release "T" handles on the solenoid valves.
7. The system should now be repaired before using again.
DO NOT tighten the handles past this point as internal damage
will turn free for several turns. Once the "T" handles are snug,
Once the internal spring tension has been released, the handles
turn the "T" handles counter clockwise. The handles may turn
3. Retract the front jacks by opening the two center valves. Slowly
2. Allow clearance for vehicle to lower.
The solenoid valves are located on the valve assembly. (See the
may occur to the solenoid.
6. Close the valves by turning the release handles clockwise.
4. Retract the rear jacks by opening the two outer valves as
may become more difficult. The valves need only to be opened
easily at first but as an internal spring is compressed, turning
if the "STORE" button on the control panel will not retract the
NOTE: Use the valve release "T" handles for retracting only
OUT WARNING AS THE VALVE RELEASE IS OPERATED.
DROP AND/OR MOVE FORWARD OR BACKWARD WITH-
IN FRONT AND REAR OF VEHICLE. THE VEHICLE MAY
NOT CRAWL UNDER THE VEHICLE, KEEP A SAFE DISTANCE
KEEP AWAY FROM THE WHEELS, DO
jacks for travel.
CAUTION:
5. Check that all four jacks are now retracted.
described in step 3.
enough to retract the jack.
MANUAL JACK RETRACTION
HYDRAULIC CONNECTION DIAGRAM)

MP35.9410
22OCT97
MANUAL ROOM RETRACT PROCEDURE
4
1
3
2
3
REAR ROOM
EXTENSION TUBES
FRONT ROOM
EXTENSION TUBES
USE ONLY WHEN ROOM CANNOT BE RETRACTED WITH THE ROOM CONTROL
SWITCH OR THE MANUAL RETRACT WINCH.
1
2
CAUTION :
4
5
FIGURE 1
FIGURE 2
CONTACT HWH CORPORATION FOR ASSISTANCE AT (1-800-321-3494).
THIS SHOULD BE DONE BY A CERTIFIED TECHNICIAN ONLY.
ROOM IN RETRACTED POSITION
ROOM IN EXTENDED POSITION
When extending or retracting the room, if one side of the room does not move, release the room control switch immediately.
The rack sensing valve plunger (1, FIGURE 1) may be stuck, bent or not touching the strike plate (2, FIGURE 1).
If one side of the room will not move while extending, repair the rack sensing valve before continuing. Remove the cylinder ad-
justing locknut (1, FIGURE 2). Turn the cylinder adjusting rod (2, FIGURE 2) clockwise as far as possible. If this is not enough
room to work on the valve, remove the cylinder mounting plate nuts (3, FIGURE 2) and the cylinder mounting plate (4, FIGURE
Refer to page MP35.9490 in the Operator’s Manual or the repair manual, and try to manually retract the room, if it is extended.
If the manual winch provided will not retract the room, DO NOT USE ALTERNATE DEVICES SUCH AS A POWER
WINCH. If possible repair the rack sensing valve (3, FIGURE 1)before retracting the room. If repair is not possible, release the
pressure on the manual retract winch. Remove the check valve cap (4, FIGURE 1) from the back of the rack sensing valve. Re-
move the check valve poppet (5, FIGURE 1). Replace the check valve cap. Retract the room using the manual re-
tract winch according to MP35.9490. DO NOT use the room extension until the rack sensing valve has been replaced. Leave
the manual winch in place and have the room extension repaired.
ROOM EXTENSION SOLENOID VALVE "T" HANDLES MUST BE IN THE OPEN POSITION WHEN THE
MANUAL RETRACT WINCH IS CONNECTED. DO NOT USE THE ROOM EXTENSION OR LEVELING SYSTEM WHEN THE
ROOM EXTENSION HYDRAULIC HOSES ARE DISCONNECTED.
2). The room can then be pulled out far enough to work on the rack sensing valve. Contact HWH Corporation, 1-800-321-3494,
for the correct rack sensing valve and cylinder replacement and adjustment instruction sheets.

MP35.9490
07FEB00
MANUAL ROOM RETRACT PROCEDURE
OVERVIEW
The room can be retracted manually if a hydraulic or electrical
failure prevents the room from being retracted using the ROOM
CONTROL SWITCH. For normal retract sequence see the
1. Retract jacks following the LEVELING SYSTEM RETRACT
PROCEDURE.
2. Locate the HYDRAULIC PUMP/MANIFOLD unit.
3. Open the SOLENOID VALVES by turning the "T" HANDLES
counterclockwise.
come more difficult to turn as an internal spring is compressed.
Be sure to open both valves completely (about six turns of
of "T" HANDLE).
are opened and internal pressure is released.
SOLENOID VALVES
"T"
HANDLES
(USE ONLY WHEN THE ROOM WILL NOT RETRACT WITH THE ROOM CONTROL SWITCH)
ROOM RETRACT PROCEDURE.
WINCH
WINCH STRAP
WINCH HANDLE
RATCHET LEVER
HOOK
MANUAL RETRACT WINCH
4. Locate the MANUAL RETRACT WINCH and connect it to
the room according to the vehicle manufacturer’s instructions.
To extend the WINCH STRAP firmly grasp WINCH HANDLE,
place RATCHET LEVER in its OFF position, and slowly rotate
the WINCH HANDLE counterclockwise, keeping a firm grip on
the handle. When enough WINCH STRAP is extended, place the
RATCHET LEVER in its ON position and slowly rotate the WINCH
HANDLE clockwise until the RATCHET LEVER locks.
5. Slowly winch the room in by turning the WINCH HANDLE
clockwise. The RATCHET LEVER should produce a loud, sharp,
clicking noise.
hydraulic fluid and make winching more difficult.
CAUTION:
ON
OFF
HYDRAULIC PUMP/MANIFOLD
NOTE :
The room may move slightly as the SOLENOID VALVES
NOTE :
NOTE : Winching the room in quickly will raise pressure in the
NOTE : The "T" HANDLE may turn easily at first but will be-
6. When the room is fully retracted, engage the room locking
devices. Leave the retract winch in place.
CAUTION: THE ROOM EXTENSION SOLENOID VALVE
"T" HANDLES MUST BE IN THE OPEN POSITION WHEN THE
MANUAL RETRACT WINCH IS ENGAGED.
7. The system should be repaired before using again.
CAUTION: THE MANUAL RETRACT WINCH IS EQUIP-
PED FOR MANUALLY RETRACTING THE ROOM ONLY. IT
IS NOT TO BE USED FOR LIFTING OR ANY OTHER AP-
When manually retracting the room, make sure the
jacks are retracted before retracting the room.
PLICATION. HIGH FORCES ARE CREATED WHEN USING
A WINCH, CREATING POTENTIAL SAFETY HAZARDS. FAIL-
URE TO FOLLOW ALL CAUTIONS AND INSTRUCTIONS MAY
CAUSE FAILURE OF THE MANUAL RETRACT WINCH OR
CONNECTIONS RESULTING IN DAMAGE OR PERSONAL
INJURY. MAINTAIN FIRM GRIP ON THE WINCH HANDLE
AT ALL TIMES. NEVER RELEASE THE HANDLE WHEN RAT-
CHET LEVER IS IN THE OFF POSITION AND THE WINCH
IS LOADED. THE WINCH HANDLE COULD SPIN VIOLENTLY
AND CAUSE PERSONAL INJURY. CHECK THE WINCH AND
STRAPS FOR DAMAGE OR WEAR, AND CHECK FOR PRO-
PER RATCHET OPERATION ON EACH USE OF THE WINCH.
DO NOT USE IF DAMAGED OR WORN.
OPERATE THE MANUAL RETRACT WINCH
BY HAND POWER ONLY. IF THE WINCH CANNOT BE
CRANKED EASILY WITH ONE HAND IT IS PROBABLY OVER-
LOADED. IF WINCHING BECOMES TOO DIFFICULT STOP
AND CHECK FOR OBSTRUCTIONS OR RESTRICTIONS ON
THE ROOM AND ROOM EXTENSION MECHANISM.
(WITH SOLENOID VALVES WITH VALVE RELEASE "T" HANDLES)

MP45.035
29JAN01
MAINTENANCE
with rebuilt parts or can be sent to HWH CORPORATION to
be rebuilt, when the system is out of warranty.
UNUSUAL CONDITIONS
Do not move the vehicle while the leveling jacks are still in
contact with the ground. Retract the jacks according to the
OIL LEVEL
ELECTRICAL SYSTEM
All electrical connections, especially ground connections,
OPERATIONAL CHECK
Review the operator manual and run the system in the
automatic and manual mode. Note any abnormal
Check that the vehicle is level when all the yellow LEVEL
indicator lights are out.
on a 36 foot vehicle.
If the red LOW BATTERY indicator light comes on, the
Review the JACK RETRACTION section.
Check the air system by using the manual "DUMP" button.
electrical system should be checked. Low voltage can
your dealer or HWH CORPORATION for assistance.
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
It is important that the room and 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
NOTE: All major components of the system can be replaced
NOTE:
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
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.
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.
+ or - 1 inch side to side, and + or - 5.4 inches front to rear
The level sensing unit has an accuracy tolerance of
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
problem may be prevented or remedied by cleaning off each
leveling jack if they become excessively muddy.
should be clean, tight, free from corrosion and protected
from weathering.
if the leveling jacks have returned to the STORE/TRAVEL
position.
"JACK RETRACTION" section and then visually check to see
height, contact your dealer or HWH CORPORATION.
retracted using the "T" handles on the solenoid valves.
Refer to the MANUAL JACK RETRACTION section.
If the system will not dump air, or return to the proper travel
hydraulic oil reservoir. The oil level should be approximately
one inch below the top of the reservoir when adequately filled.
clean.
operation.
cause erratic operation or damage to components. Contact
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:

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.

The following is a list of problems, and possible solutions, which might occur to the room extension systems.
1. HYDRAULIC PUMP WILL NOT ACTIVATE WHEN ROOM
TROUBLE SHOOTING
MP55.03
05MAY99
B. A JACK WARNING LIGHT is not on.
E. 12 VOLT power to pump relay not present.
D. PUMP RELAY and/or HYDRAULIC PUMP are not
F. Faulty wire, electrical connection, KEY SWITCH,
2. HYDRAULIC PUMP ACTIVATES, BUT ROOM WILL NOT
A. EXTEND SOLENOID VALVE is not properly grounded.
B. Reservoir oil supply is low.
C. Hydraulic line is pinched or broken.
D. Faulty wire, electrical connection, ROOM CONTROL
PUMP, or HYDRAULIC CYLINDER.
3. HYDRAULIC PUMP ACTIVATES, BUT ROOM WILL NOT
A. RETRACT SOLENOID VALVE IS NOT properly
B. Reservoir oil supply is low.
C. Hydraulic line is pinched or broken.
D. Faulty wire, electrical connection, ROOM CONTROL
PUMP, or HYDRAULIC CYLINDER.
4. ROOM CREEPS OUT AFTER CLOSING.
A. "T" HANDLE on EXTEND SOLENOID VALVE is not
B. EXTEND SOLENOID VALVE has an internal leak.
C. HYDRAULIC CYLINDER has an internal leak.
A. "T" HANDLE on RETRACT SOLENOID VALVE is not closed
B. RETRACT SOLENOID VALVE has an internal leak.
ROOM EXTENSION
CONTROL SWITCH IS PRESSED.
properly grounded.
ROOM CONTROL SWITCH, PUMP RELAY, or PUMP
EXTEND.
SWITCH , EXTEND SOLENOID VALVE, HYDRAULIC
RETRACT.
SWITCH , RETRACT SOLENOID VALVE, HYDRAULIC
closed completely.
completely.
A. KEY SWITCH is in the "OFF" POSITION.
C. FUSE is blown.
D. The MANIFOLD CHECK VALVE is leaking.
NOTE :
MOTOR.
grounded.
5. ROOM CREEPS IN AFTER BEING EXTENDED.
Only qualified technicians should install or repair room systems. A knowledge of hydraulic, welding, the vehicle,s sus-
pension and electrical systems is required. In addition, an understanding of the room extensions system,s hydraulics and elec-
tronics is required.

LF RF
LR RR
FRONT
HYDRAULIC CONNECTION DIAGRAM
MP65.3705
15MAY97
HYDRAULIC CYLINDER
HYDRAULIC CYLINDER
DUAL CYLINDER ROOM EXTENSION LEFT REAR
JACK
RIGHT REAR
JACK
RETURN
PRESSURE
JACK
FRONT
LEFT RIGHT
FRONT
JACK
REAR LEFT FRONT LEFT FRONT RIGHT REAR RIGHT
TO SHUTTLE
VALVE ON
BOTTOM OF
MANIFOLD
VALVE RELEASE
"T" HANDLES (2)
"T" HANDLES (4)
VALVE RELEASE
500 SERIES, COMPUTER-CONTROLLED LEVELING SYSTEM WITH
A DUAL CYLINDER ROOM EXTENSION WITH RACK SENSING VALVE

MP65.3710
29APR97
ELECT.
SOL.VALVE
OUTER
VALVE
CHECK
VALVE
CHECK
ASSEMBLY
SOLENOID MANIFOLD
MAIN HYDRAULIC
SOL.VALVE
INNER LR LF SOL.VALVESOL.VALVE
RF RR
PRES. SW.
WITH STRAIGHT-ACTING JACKS
HYDRAULIC SCHEMATIC
VALVE
STAB. SOL.
SOME UNITS)
(ADJUSTABLE ON
RELIEF VALVE
RETURN
POWER UNIT
HYDRAULIC
12 VOLT D.C.
VALVE.
SHUTTLE
RETURN
PRESSURE/
PRESSURE
M
FLOW SWITCH
RELIEF VALVE/
LEFT REAR
LEFT FRONT RIGHT FRONT
RIGHT REAR
3000 PSI

MP65.9430
10APR97
TO PUMP RETURN PORT TO PUMP PRESSURE PORT
FIXED TO
VEHICLE
VEHICLE
FIXED TO
REAR CYLINDER
FRONT CYLINDER
ROOM EXTENSION
MANIFOLD
RETRACT
SOLENOID
VALVE
SOLENOID
VALVE
EXTEND
FRONT OF VEHICLE
TRAVEL
ROOM
PRESSURE
(IF APPLICABLE)
PORT
(IF APPLICABLE)
RETURN
PORT
VALVE
SENSING
RACK
THIS LINE IS PRESSURIZED
DURING EXTEND AND RETRACT.
DURING EXTEND ONLY.
THIS LINE IS PRESSURIZED
DURING RETRACT, IT IS VENTED
TO THE RESERVOIR.
NOTE:
NOTE:
HYDRAULIC SCHEMATIC DIAGRAM
DUAL CYLINDER ROOM EXTENSION SYSTEM
W/RACK SENSING VALVE

3/8" O.D. TUBE
SUSPENSION
AIR BAGS
SUSPENSION
AIR BAGS
NEW LINE
AIR LINE CONNECTION DIAGRAM
MP75.2
15MAY97
EXISTING
LINE
4 AIR DUMP SOLENOID VALVES
AND 4 HEIGHT CONTROL VALVES
ARE SHOWN.
THE AIR DUMP VALVE IS TO TEE
INTO THE LINE BETWEEN THE
AIR BAG AND THE HEIGHT CONTROL
VALVE. THREE HEIGHT CONTROL
VALVES ARE THE MOST COMMON
ON AIR SUSPENSION SYSTEMS.
2, 3 OR 4 CONTROL VALVES MAY
BE USED.
USE ONLY DOT
APPROVED
FITTINGS AND
TUBING.
HEIGHT
CONTROL
VALVE
AIR DUMP SOLENOID VALVES
ARE ACTIVATED (OPENED) BY
A +12 SIGNAL.
SEE ELECTRICAL
DIAGRAM FOR
CONNECTION
FROM WIRE HARNESS
BA
A
B
A
B
A
B

ROOM RETRACT BLACK
ROOM EXTEND YELLOW
BATTERY RED
IGNITION YELLOW
ACCESSORY BROWN
PARK BRAKE SENSOR BLUE
WHITE (GROUND)
YELLOW LEFT SIDE
BLACK FRONT
GREEN RIGHT SIDE
RED REAR
SENSING UNIT
MASTER
WARN
LIGHT
PARK
BRAKE
POWER
HARNESS
CONTROL BOX CONNECTION DIAGRAM
MP85.3705
01MAY97
CONNECTOR
JACK WARNING
SWITCHES
15
15
15
15
15
15
15
15
5
5
5
10
10
MANIFOLD PRESSURE SW.
R.R. ORANGE
L.R. BROWN
STABILIZE PURPLE
R.F. GREEN
L.F. BLUE
AIR DUMP GRAY
MASTER RELAY RED
PUMP RELAY GRAY
HARNESS
PUMP/MANIFOLD
1
2
3
4
5
6
8
9
10
12
13
14
15
1 BATTERY
2 IGNITION
3 ACCESSORY
4 ROOM RETRACT
5 ROOM EXTEND
6 AIR DUMP
7 PARK BRAKE
9 PUMP
10 RIGHT REAR SOLENOID
11 FUSE 15 AMP
12 LEFT FRONT SOLENOID
13 RIGHT FRONT SOLENOID
14 STABILIZE SOLENOID
15 LEFT REAR SOLENOID
ESSEX RELAY MOUNTED
ON INSIDE OF BOX
**ATTACH #10 BLACK
WIRE FROM PUMP
HARNESS
**#10 BLACK WIRE
GROUND #10 WIRE
TO FRAME RAIL
GROUND STUD MOUNTED
ON SIDE OF BOX
WARNING LIGHT
CONTROL PURPLE
L.R. GREEN
R.R. BLUE
R.F. RED
R.R. WHITE
40PIN
NUMBER STICKER
PART & SERIAL
ROOM SWITCH EXTEND PURPLE
ROOM SWITCH RETRACT BLACK
ROOM EXT. SW. HARNESS
ROOM EXTENSION MANIFOLD HARNESS
WARN SW./ AIR DUMP
15
11
GROUND WIRES
FROM WARNING
SWITCH HARNESS 8 MASTER RELAY
75
FUSE DESIGNATION

SEE CONTROL
BOX CONNECTION
SENSING
ELECTRICAL CONNECTION DIAGRAM
COMPUTER-CONTROLLED HYDRAULIC LEVELING
WITH TOUCH PANEL CONTROL
MP85.3710
01MAY97
PARK BRAKE
PIGTAIL-BLUE
TO BRAKE LIGHT
ON DASH PARK BRAKE
SWITCH
UNIT
RIBBON
CABLE
TOUCH PANEL
PURPLE
GROUND
STUD
POWER
HARNESS
TO MASTER
WARNING
MANIFOLD WIRING
DIAGRAM
MASTER AND PUMP
RELAY WIRING
DIAGRAM
WARNING
A
LR
B
SWITCH
RR
SWITCH
WARNING
B
A
WARNING
SWITCH
B
A
RF
LF
SWITCH
WARNING
B
A
BLUE
WHITE
RED
WHITE
BROWN
WHITE
YELLOW
JACK WARNING
SWITCH HARNESS
DIAGRAM
INDICATORS
HARNESS
MANIFOLD
PUMP/
HWH COMPUTERIZED LEVELING
CAUTION!
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
STORE
HYD
DUMP
OFF
TRAVEL
BRAKE
NOT IN
LEVEL EXCESS
PARK/
SLOPE
POWER UNIT/HARNESS
INSTRUCTIONS
GROUNDING
B
A
GRAY
A
WHITE
A
B
WHITE
GRAY ARE POSSIBLE
OTHER AIR DUMP
VALVE ARRANGEMENTS
AIR DUMP
VALVE
RED - BATTERY
YELLOW - IGN
BROWN - ACC
WHITE
GRAY
AB
DO NOT REVERSE WIRE
COLORS TO A & B ON
PACKARD CONNECTORS
B
MAKE ALL GROUNDING
CONNECTIONS BEFORE
APPLYING POWER
TO BOX.

MP85.3715
ORANGE GREEN BLUE BLACK
BLACK
RIGHT
REAR RIGHT FRONT LEFT FRONT LEFT REAR
WHITE WHITE WHITE WHITE
HYDRAULIC MANIFOLD
WIRING DIAGRAM
FOR 500 SERIES LEVELING SYSTEMS
12MAY97
BA BA
E. D.
P.
D.
BA
E.
P.
D.
E.
P.
D.
BA
E.
P.
BROWN WHITE
BA
E. D.
P.
PURPLE
FLOW SWITCH
STABILIZE
SOLENOID
PRESSURE
SWITCH