HWH 325 SERIES User manual

OPERATOR’S MANUAL
ML40341/MP04.1962
05MAR07
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
325 SERIES LEVELING SYSTEM
HWH TOUCH PANEL-CONTROLLED
R
Straight-Acting Jacks
AP40340
R
HWH HYDRAULIC LEVELING
CAUTION!
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
DUMP
OFF
STORE
NOT IN
PARK/
BRAKE
ON
Optional Suspension Air Dump
W
CORPORATION
HH
R

CAUTION !
READ THE ENTIRE OPERATOR MANUAL BEFORE OPERATING.
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 MOVE FORWARD OR BACKWARD WITHOUT WARNING CAUSING INJURY OR DEATH.
WEAR SAFETY GLASSES WHEN INSPECTING OR SERVICING THE SYSTEM TO PROTECT EYES FROM DIRT, METAL
CHIPS, OIL LEAKS, ETC. FOLLOW ALL OTHER APPLICABLE SHOP SAFETY PRACTICES.
OPERATOR’S MANUAL
KEEP ALL PEOPLE CLEAR OF VEHICLE WHILE DUMPING AIR FROM THE VEHICLE’S SUSPENSION.
DO NOT MOVE THE VEHICLE IF THE VEHICLE IS NOT AT THE PROPER RIDE HEIGHT. CONTACT MANUFACTURER
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.
23FEB07
MP14.0002
TECHNICAL SERVICE FOR MOVING THE VEHICLE WHEN NOT AT THE PROPER RIDE HEIGHT.
KEEP ALL PEOPLE CLEAR OF VEHICLE WHILE OPERATING LEVELING SYSTEM OR ROOM EXTENSIONS.

CONTROL FUNCTIONS
leveling system.
325 - CONTROL IDENTIFICATION
POWER ON LIGHT
WARNING LIGHTS (4-Red)
CONTROL BUTTONS INDICATOR LIGHTS
FRONT EXTEND BUTTON
FRONT RETRACT BUTTON
RIGHT SIDE RETRACT BUTTON
RIGHT SIDE EXTEND BUTTON
extend their respective jack pairs to lift the vehicle.
LEFT SIDE EXTEND
REAR EXTEND BUTTON
REAR RETRACT BUTTON
LEFT SIDE RETRACT
POWER ON LIGHT:"ON" BUTTON:
"OFF" BUTTON:
"STORE" BUTTON:
EXTEND BUTTONS (UP ARROWS):
RETRACT BUTTONS (DOWN ARROWS):
These buttons will
This light indicates the system is on.
STORE LIGHT
STORE LIGHT:
the store mode.
WARNING BUZZER:
BUTTON
"ON" BUTTON
"OFF" BUTTON
"STORE" BUTTON
BUTTON
This is the ON button for the leveling
system.
This button turns off control power to the
This button will dump the air from
will retract their respective jack pairs to lower the vehicle.
extended approximately 1/2 inch or more and the ignition
This light will be on when the system is in
A buzzer will sound if a jack is
These buttons
switch is in the "ON" position.
jack is extended 1/4 to 1/2 of an inch.
"ACC" position, the system is on and the corresponding
They are functional only when the ignition is in the "ON" or
yellow level indicators are jacks down WARNING lights.
The four red lights surrounding theWARNING LIGHTS:
LEVEL LIGHTS (4-Yellow)
If a yellow LEVELING light is on, that
two yellow LEVELING lights can be on at a time. The vehicle
the appropriate jack pairs to put out the yellow light. One or
indicates a side, corner, or end of the vehicle is low. Extend
is level when all yellow lights are out.
LEVELING LIGHTS:
MP24.1141
05MAR07
"DUMP" BUTTON
"DUMP" BUTTON:
This button will retract all four jacks.
the vehicle suspension.
"NOT IN PARK/BRAKE" LIGHT: This indicator light will
light when the hand/auto brake is not set and the "ON" button
is being pushed.
MASTER "JACKS DOWN" WARNING LIGHT:This is a
light mounted separate from the touch panel. It will be lit
when any one or more jacks are extended and the ignition
is "ON".
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
HWH HYDRAULIC LEVELING
DUMPSTORE
OFF
ON
BRAKE
CAUTION!
PARK/
NOT IN
FRONT - Right front and Left front jacks.
RIGHT SIDE - Right front and Right rear jacks.
LEFT SIDE - Left front and Left rear jacks.
REAR - Left rear and Right rear jacks.

OPERATING PROCEDURES
LEVELING PROCEDURE
GENERAL INSTRUCTIONS
1. Place gear selector in the parking position, apply park
brake and block tires securely.
3. Push the "ON" button on the touch panel. The POWER
ON light will come ON.
8. Push the "OFF" button on the Touch Panel.
9. Turn the ignition switch off.
2. Turn ignition switch to "ACCESSORY".
5. Place a pad under each jack, if needed, at this time.
NOTE: If the ground is too uneven, the jacks may
not have enough stroke to level the vehicle.
The vehicle may have to be moved.
NOTE: The leveling system should be cycled once a
month or whenever the vehicle is used, to keep the
system in operating condition.6. A lit yellow LEVEL light indicates that end, side or corner is
low. Push an EXTEND (up arrow) button to extend jack pairs
according to a lit yellow light.
7. After the vehicle is level, the jacks not used for leveling
may be extended until they touch the ground. The remaining
jacks used to stabilize the vehicle should lift the vehicle
slightly after touching the ground. This provides additional
stability against wind and activity in the vehicle. Do this by
pushing the front and/or rear EXTEND buttons as needed to
extend any remaining jacks. Do not use the right or left
EXTEND buttons.
ALWAYS LEVEL THE VEHICLE FROM SIDE TO SIDE,
IF NECESSARY, BEFORE LEVELING THE VEHICLE
One or two yellow LEVEL lights can be
on at one time. Extend jack pairs accordingly until all yellow
only while the "ON" button is being pushed.
turn on. The "NOT IN PARK/BRAKE" light will be on
NOTE: If the park brake is not set the panel will not
05MAR07
MP34.3006
GENERAL INSTRUCTIONS
before extending or retracting any room.
Read all room extension operating procedures before
or asphalt paving, a wood block or pad should be placed
equipment malfunction, etc. If parking on soft ground
jacks extending or retracting, settling of jacks or vehicle,
steps, etc. Vehicle may move in any direction due to
directions for vehicle, room extensions, awnings, doors,
Maintain adequate clearance in all
under each jack.
Site selection -
when the vehicle is supported by the leveling system.
IMPORTANT: Do not use a room extension support
generator slide is completely retracted before moving
are completely retracted and any room extension or
It is the operator’s responsibility to check that the jacks
the vehicle. The vehicle must be at the proper ride
FRONT TO REAR.
lights are out.
time to stop the operation of the system.
Press the "OFF" button or turn the ignition OFF at any height before traveling.
4. If applicable, push the "DUMP" button. The air will dump
from the vehicle suspension. Continue with leveling when
air has stopped exhausting from the suspension. On some
This manual is intended for vehicles with or without an air
suspension. It may be best to level with the vehicle engine
off.
NOTE: If the vehicle is equipped with an air suspension,
dump the suspension air at this time. If the vehicle is
equipped with a manual pilot air dump, refer to the
vehicle manufacturer for instructions.
systems it may be necessary to push and hold the DUMP
button.
ROOM EXTENSION PROCEDURES
extension read this section carefully.
IMPORTANT: If the vehicle is equipped with a room
when the room is extended is not recommended.
IMPORTANT: Extending or retracting any leveling jacks
IMPORTANT: It is recommended to level and stabilize
the vehicle before extending the room.
Refer to the vehicle owner’s manual for proper operation of
IMPORTANT: Do not use a room extension support
when the vehicle is supported by the leveling system.
room extensions.

MP34.3103
07MAR07
OPERATING PROCEDURES
325 SERIES LEVELING SYSTEM
by pushing the "STORE" button before traveling.
IMPORTANT: Pushing the "OFF" button or turning the
ignition key will stop the STORE procedure. Any time
the STORE procedure is stopped before all 4 red Warning
Lights go out, the jacks should be completely retracted
NOTE: When traveling thermal expansion may cause
a jack to extend slightly. When the "STORE" button
has been used to retract the jacks, the system will
automatically retract any jack that extends due to
2. Press the "STORE" button. The store indicator light will
flash. As each jack retracts, its red WARNING light will go
out. The vehicle suspension will begin to return to ride
height. The system will automatically shut down two
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.
THE OPERATOR MUST BE SURE THAT
THERE ARE NO OBJECTS UNDER THE VEHICLE AND THAT
ALL PEOPLE ARE CLEAR OF THE VEHICLE.
1. Turn the ignition to "ON" or "ACC" or start the engine.
NOTE: When the jacks are stored with the ignition in
the ON position, the warning buzzer will sound until
the jacks have retracted to the STORE position. If
desired, the jacks can be stored with the ignition key
in the accessory position. This will eliminate the
warning buzzer while the jacks are retracting.
thermal expansion.
CAUTION:
4. If jacks cannot be retracted by the above procedure see
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
STORE/TRAVEL POSITION
3. The vehicle can be moved as soon as the red warning
lights are out, the jacks are in the STORE/TRAVEL position
and the vehicle is at the proper ride height for traveling.
THE STORE/TRAVEL POSITION AND THE VEHICLE IS AT
IMPORTANT: If a red warning light and buzzer come on
while traveling, the jacks should be checked as soon as
CAUTION:
MANUAL JACK RETRACTION Section.
a safe parking location is found.
THE PROPER RIDE HEIGHT.
JACK POSITIONS
EXTEND POSITION
JACK RETRACTION
fail to retract completely, extend the jacks back down
to the ground then retract the jacks again.
NOTE: If the vehicle is parked or stored with the jacks
extended for an extended period of time and the jacks
the TRAVEL position at this time. See the vehicle
and has a manual pilot dump, place the suspension in
NOTE: If the vehicle is equipped with an air suspension,
manufacturer for instructions.

OPERATING PROCEDURES
MP34.3302
07MAR07
MANUAL JACK RETRACTION
been opened far enough to allow the jacks to retract.
the T-Handle will turn harder. Make sure the valves have
will turn several turns easily. As the valve starts to open,
Large style with T-Handle valve release:
power unit. The upper most manifold should control
NOTE: Multiple manifolds may be present on the
retract the jacks.
if the STORE feature on the HWH control panel will not
Use the manual valve release for retracting the jacks only
DO NOT CRAWL UNDER THE VEHICLE, KEEP A SAFE
DISTANCE IN FRONT AND REAR OF THE VEHICLE.
THE VEHICLE MAY DROP AND/OR MOVE FORWARD
OR BACKWARD WITHOUT WARNING AS THE VALVE
RELEASE IS OPERATED.
1. Locate your power unit-manifold assembly.
2. Allow clearance for the vehicle to lower.
CAUTION:KEEP AWAY FROM THE WHEELS,
point as internal damage may occur to the solenoid.
incorporated into the Breather Cap. Before using read
NOTE: As of APRIL 2002 a 1/4" Nut Driver has been
and understand the last page of this manual.
6. Check that all jacks are now retracted. If yes, continue.
7. Close the valves by turning each valve release clockwise.
DO NOT tighten the manual valve release past this
IMPORTANT: Once the manual valve release is snug,
8. The system should now be repaired before using again.
3. Using the diagram below identify the style
5. Repeat the process by identifying then opening
the two outer valves, if applicable.
LARGE STYLE
WITH T-HANDLE
VALVE RELEASE
SMALL STYLE
WITH VALVE
RELEASE NUT
LARGE STYLE
RELEASE NUT
WITH VALVE
PLASTIC PLUG
BREATHER
CAP
Small style with Valve Release Nut: DO NOT
1/4" valve release nut more than . Turning
the nut more could damage the valve.
release nut is located under a plastic plug that must be
removed to gain access.
could damage the valve.
Large style with Valve Release Nut:
The T-Handle
The 1/4" Valve
turn the
DO NOT turn the 1/4" valve
release nut more than . Turning the nut more
jack functions. (Valve styles and arrangements will vary)
POWER UNIT-MANIFOLD ASSEMBLY
MANIFOLD
of your two center valves.
If no, notify the dealership where you purchased the vehicle
or had the leveling system installed or contact
(The diagram below represents a typical Power Unit-
MANUAL JACK RETRACTION
extensions are fully retracted prior to performing
IMPORTANT: HWH recommends that all HWH room
manual jack retraction procedures.
Manifold Assembly it may not be an exact match to yours).
4. Retract the front jacks by opening the two center valves.
Slowly turn the manual valve releases counter clockwise
until the jacks start to retract.
1 full turn
4 and 1/2 turns
HWH Corporation customer service.

MAINTENANCE
MP44.0000
13FEB07
OIL LEVEL
The oil level should be checked when the vehicle is first
purchased and then once every two years. More often if
there is an oil leak in the system.
All jacks and any HWH room extension cylinders should be
completely retracted before checking the oil level. The oil
reservoir is part of the pump/manifold assembly. The oil level
Most breather caps have a dipstick.
NOTE: Overfilling the tank can cause leakage of oil
through the breather cap.
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
All electrical connections, especially ground connections,
should be clean, tight, free from corrosion and protected
JACKS
There are very few user serviceable parts on the jacks
The jacks require very little maintenance. If the jacks are
VISUAL INSPECTION
Periodically inspect the system for oil leaks and
damaged or missing parts, such as pivot bolts or springs.
Check the hydraulic lines and wiring for damage and wear.
Check that the jacks do not interfere with any parts of the
vehicle when they are in the "STORE" position.
The jacks should be cycled at least once a month or
whenever the coach is serviced. The system will operate
better if kept clean and free from caked on mud or ice.
OPERATIONAL CHECK
Check that all lights work according to the "INDICATOR
LIGHT" Section. Correct function of the red "WARNING"
Review the OPERATOR MANUAL. Run the system
according to the SYSTEM OPERATION Section.
Note any abnormal operation.
Review the "JACK RETRACTION" Section. Make sure the
jacks will fully retract to the "STORE" position. Jacks should
not interfere with any of the coach when in the "STORE"
All maintenance should be done as part of the normal
servicing of the coach.
is checked and filled through the breather cap. Clear any dirt
clean. from weathering.
light is important.
position.
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:
away from the breather/filler cap before removing. The oil
level should be within one inch of the top of the reservoir.
extremely dirty with caked on mud they should be washed.
The jack rods should NOT be wiped and do not need to
be oiled or sprayed with anything.
ROOM EXTENSIONS
The HWH room mechanisms need no maintenance.
DO NOT grease or lubricate any parts of the HWH
mechanism.
Any visible mechanism can be kept clean by washing
with water. Refer to the vehicle manufacturer for
correct maintenance of the room seals.

MAINTENANCE
SENSING UNIT - TOP VIEW
D
C
A
B
LED’S - LOCATION
CONTROL BOX - SIDE VIEW
MAY BE DIFFERENT
NOT IN PARK/BRAKE CHECK
Set the park/brake. Switch the ignition to the "ACC" or "ON"
position. Push the "ON/OFF" switch toward "ON". Release
the parking brake and confirm that the "PARK" indicator light
comes on. Reset the parking brake. The "PARK" indicator
light should go out. Switch the ignition to "OFF".
THE COACH WHEELS SECURELY SO THE COACH
CANNOT ROLL FORWARD OR BACKWARD.
CAUTION: WHEN MAKING THIS CHECK, BLOCK
If any of the above checks or inspections 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 for service or repair.
07MAR07
MP44.1501
ADJUSTMENT
NUT (7/8" or 3/4")
BOX WALL
CONTROL
SCREW (Phillips or 1/4")
ADJUSTMENT
NUT (5/16")
ADJUSTMENT
SENSING UNIT ADJUSTMENT
adjustments first, then hold the adjustment nut from moving
while making the A-C adjustment.
wrench and a philips screw driver will be needed.
needed. A 7/8", 3/4" or 5/16" socket w/driver or box end
Touch Panel, manual adjustments to the Sensing Unit are
properly adjusted. If there are yellow LEVEL lights lit on the
are no yellow lights lit on the Touch Panel, the sensing unit is
With the vehicle level according to the bubble level, if there
Control Box. If two LED’s are on, it is best to make the B-D
be a problem with the Sensing Unit or the mounting of the
be turned more than 3/4 turn to turn the LED out, there may
to be turned more than 1/2 flat or the adjustment screw has to
screw will turn out LED’s A and C. If the adjustment nut has
the adjustment nut to turn out LED’s B and D. The adjustment
to the drawing below. The Sensing Unit is adjusted by turning
There are four LED’s on the Sensing Unit, A,B,C and D. Refer
Control Box is mounted to the power unit/valve assembly.
The Sensing Unit is mounted inside the Control Box. The
level the vehicle until the bubble is centered.
level, ignoring the yellow LEVEL lights on the Touch Panel,
that is to be level. Using the Leveling System and the bubble
the freezer floor or upon whichever surface within the vehicle
Level the vehicle by placing a bubble level in the center of
the vehicle, the front is still low. This means the front
"tweaking" process until the system levels the vehicle
touch panel. Recheck with a level. Repeat the
relevel the vehicle using the yellow level lights on the
the front up more. Again, unlevel the vehicle then
the front yellow light to stay on slightly longer to bring
instructions for LED’s A, B, C, and D. This will allow
the OPPOSITE direction that is given in the above
Move the adjustment for that light very, very, slightly in
which sensing unit light is the front light, A-B-C or D.
yellow level light is turning off too soon. Determine
properly.
Example: After the initial adjustment and releveling
sensing unit, ignoring the LED’s on the sensing unit.
yellow level lights go out, instead just "tweak" the
needed, DO NOT try to adjust the sensing unit until the
LEVEL lights. Recheck the level. If more adjustment is
lights are on. Level the vehicle according to the yellow
vehicle to an unlevel position so one or two yellow
IMPORTANT: When all 4 LED’s are off, move the
If LED (D) is lit: Turn the adjustment nut CLOCKWISE
If LED (B) is lit: Turn the adjustment nut COUNTER
If LED (C) is lit: Turn the adjustment screw CLOCKWISE
If LED (A) is lit: Turn the adjustment screw COUNTER
NOTE: If opposing LED’s are lit, there is a problem with
until the LED is off.
CLOCKWISE until the LED is off.
until the LED is off.
CLOCKWISE until the LED is off.
the Sensing Unit.
ADJUSTMENT NUT (7/8" or 3/4")
ADJUSTMENT SCREW (Phillips or 1/4")
ADJUSTMENT NUT (5/16")

BREATHER CAP - DIPSTICK - 1/4" NUT DRIVER
MP84.9999
07FEB07
VALVE RELEASE
NUT 1 1/2" DIAMETER
SOLENOID VALVE
NOTE: DO NOT turn the valve
release nut more than 4 and 1/2
(four and one half) turns counter
clockwise. Damage to the valve
may result.
OIL LEVEL
BREATHER CAP
OIL LEVEL GROOVES
1/4" NUT DRIVER
NOTE: THE BREATHER CAP IS LOCATED
ON THE TOP SIDE OF THE POWER UNIT RESERVOIR.
IMPORTANT: PRIOR TO REMOVING THE BREATHER CAP,
EITHER TO CHECK THE OIL LEVEL OR TO USE THE 1/4" NUT DRIVER,
CLEAN ANY DEBRIS FROM THE TOP OF THE RESERVOIR.
INCLUDING DEBRIS INSIDE THE 1/4" NUT DRIVER.
REMOVE ANY PAINT CHIPS OR OTHER DEBRIS FROM THE DIPSTICK
BEFORE RETURNING THE BREATHER CAP TO THE RESERVOIR,
VALVE RELEASE
NUT
to the valve may result.
turn counter clockwise. Damage
NOTE: DO NOT turn the valve
release nut more than 1 full
PLASTIC PLUG
REMOVE TO
GAIN ACCESS
TO THE 1/4"
VALVE RELEASE
NUT
SOLENOID VALVE
2 1/4" DIAMETER