HWH 325 SERIES User manual

OPERATOR’S MANUAL
ML40336/MP04.1961
05MAR07
Touch Panel Control
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
Straight-Acting Jacks
With Jack Stop Rods
AP40335
CAUTION!
ON
STORE
OFF
HWH HYDRAULIC LEVELING
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
FOR TRAILERS
R
CORPORATION
W
HH
R

CAUTION !
READ THE ENTIRE OPERATOR’S MANUAL BEFORE OPERATING.
MOVE FORWARD OR BACKWARD WITHOUT WARNING CAUSING INJURY OR DEATH.
KEEP ALL PEOPLE CLEAR OF VEHICLE WHILE LEVELING SYSTEM IS IN USE.
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 PENETRATE SKIN
WEAR SAFETY GLASSES WHEN INSPECTING OR SERVICING THE SYSTEM TO PROTECT EYES FROM DIRT, METAL
SET FRONT JACK STOP RODS AFTER LEVELING OR PARKING THE TRAILER. WHILE SETTING STOP RODS, HITCHING
OR UNHITCHING, AVOID AREAS WHERE BODY MAY BE CRUSHED BY SUDDEN DROPPING OR SLIDING OF THE TRAILER.
DO NOT USE THE LEVELING JACKS IF STOP RODS, RETAINING PINS OR GUIDES BECOME DAMAGED, LOST OR IN
ANY WAY INOPERATIVE.
MP14.0001
13FEB07
IMPORTANT: IF VEHICLE IS EQUIPPED WITH A ROOM EXTENSION, READ ROOM EXTENSION SECTION BEFORE
OPERATING LEVELING SYSTEM.
DO NOT LIFT TOW VEHICLE WITH 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 FUNCTIONS
This is the "ON" button for the leveling system. This light indicates the system is on.
indicates a side or end of the trailer is low. Extend the appro-
priate jack pairs to put out the yellow light. One or two yellow
CONTROL IDENTIFICATION
CONTROL BUTTONS INDICATOR LIGHTS
MP24.1140
05MAR07
Fifth wheel trailers are equipped with
straight-acting jacks. The respective red WARNING light will
be on if a straight-acting jack is extended approximately
1/4 to 1/2 inch.
"ON" BUTTON:
NOTE: Side arrows operate the rear jacks only.
ON LIGHT:
LEVELING LIGHTS:
WARNING LIGHTS:
This button turns off control power to the
leveling system.
ON LIGHT WARNING LIGHTS
(4 - Red)
LEVELING LIGHTS
(4 - Yellow)
CAUTION!
ON
STORE
OFF
HWH HYDRAULIC LEVELING
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
"STORE" BUTTON
EXTEND FRONT BUTTON
RETRACT FRONT BUTTON
RETRACT RIGHT SIDE BUTTON
EXTEND RIGHT SIDE BUTTON
This button will retract all four jacks at the
same time. It is to be used only after the trailer has been hitched
to the tow vehicle.
extend their respective jacks and raise the trailer.
These buttons will
retract their respective jacks and lower the trailer.
"OFF" BUTTON:
"STORE" BUTTON:
EXTEND BUTTONS (UP ARROWS):
RETRACT BUTTONS (DOWN ARROWS):
STORE LIGHT
"ON" BUTTON
"OFF" BUTTON
EXTEND LEFT SIDE RETRACT LEFT SIDE
BUTTON
BUTTON
EXTEND REAR BUTTON
RETRACT REAR BUTTON
STORE LIGHT: This light indicates the leveling system is in
the STORE mode.
These buttons will
LEVELING lights can be on at the same time. The trailer is
level when all yellow lights are out.
If a yellow LEVELING light is on, that

OPERATING PROCEDURES
SET UP PROCEDURE
1. Trailer must be unhitched from the tow vehicle before level-
ing. The HWH front jacks may be used to lift the trailer for
unhitching. If auxiliary jacks are used to unhitch the trailer,
If parking on soft ground or asphalt paving, a wood block or
for unhitching.
pad should be placed under each jack.
will result if raise arrows are operated for an extended
period of time.
2. The touch panel must be on for the system to function.
3. Lower the front of the trailer until the front yellow level
indicator lights come on. This is done by pushing the front
RETRACT button (DOWN ARROW). The red jacks down
4. A lit yellow LEVEL light indicates that the side, end or corner
of the trailer is low. Pushing the up arrow for corresponding yellow
level lights will extend that jack or jack pair to level the vehicle.
Extend jacks as needed to put out all the yellow lights. Always
give a side yellow level light priority when leveling the trailer.
If the ground is too uneven, the jacks may not have engough
stroke to level the trailer. The trailer may have to be moved.
5. After the trailer is level, the jacks not used for leveling may
be extended until they touch the ground. This provides addi-
6. Push the "OFF" button on the touch panel to turn the system
7. The jack stop rods should be adjusted immediately after
the leveling and stabilizing procedure is finished.
trailer is supported by the front jacks.
CAUTION: WHILE SETTING STOP RODS AVOID
AREAS WHERE BODY MAY BE CRUSHED BY SUDDEN
DROPPING OR SLIDING OF TRAILER.
A. Remove retaining pin to allow stop rod to drop down to
the foot of the jack.
B. Lift stop rod as needed (up to 4") to align the hole in the
guide with the nearest available hole in the stop rod. Insert
the retaining pin through the holes in the guide and stop rod.
Latch the keeper wire for the retaining pin.
once a month or whenever the trailer is used. To keep
the system in operating condition.
STOP ROD
RETAINING PIN
STOP ROD POSITION
GUIDE
ROOM EXTENSION PROCEDURES
extension read this section carefully.
IMPORTANT: If the vehicle is equipped with a room Refer to the vehicle owner’s manual for proper operation of
room extensions.
IMPORTANT: Do not use a room extension support
when the vehicle is supported by the leveling system.
warning lights will light when the jacks are extended
tional stability against wind and activity in the trailer. Jacks
off.
NOTE: Refer to the trailer manufacturer owner’s manual
IMPORTANT: Overheating and excessive current drain
NOTE: The jack stop rods should be set anytime the
NOTE: The leveling system should be cycled at least
05MAR07
MP34.3005
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.
extend the HWH front jacks to the ground and retract the
auxiliary jacks before the leveling system is used for leveling.
1/4 to 1/2 inch.
NOTE: When a side arrow (UP or DOWN) is pushed only
the rear jack on that side will extend or retract.
used to stabilize the trailer should lift the trailer about 3/4 inch.

OPERATING PROCEDURES
STOP ROD
RETAINING PIN
STOP ROD POSITION
1. Before retracting the jacks, the stop rods must be returned
to the travel position.
CAUTION: WHEN STORING THE JACK STOP
RODS, AVOID AREAS WHERE BODY MAY BE CRUSHED
BY SUDDEN DROPPING OR SLIDING OF TRAILER.
a. Remove the retaining pin. If the trailer weight is on the
stop rods, the front jacks may have to be extended slightly
to free the retaining pin.
b. Lift the stop rod to align the bottom hole in the stop rod
with the hole in the guide. Insert the retaining pin through
both holes and latch the retaining pin keeper wire.
3. Push and hold the rear RETRACT button until the rear
2. Push the "ON" button.
5. When the vehicle is securely hitched to the tow vehicle,
push the "STORE" button. All four jacks will retract. The
panel will automatically turn off 2 minutes after the last of
7. Visually inspect all of the jacks to make sure they are
fully retracted before moving the trailer.
CAUTION: ONLY USE THE "STORE" BUTTON
IF THE TRAILER IS HITCHED TO A TOW VEHICLE.
PREPARATION FOR TRAVEL
6. Press the "OFF" button to turn the system off.
WARNING lights are out.
MP34.3104
07MAR07
4. Hitch the trailer to the tow vehicle using the front
UP (extend jacks) DOWN (retract jacks) arrows according
to the procedure supplied by the trailer manufacturer.
the four red warning lights go out. If any red warning light
remains on, the system will try to store the jacks for 20
minutes from the time the "STORE" button is pushed,
then turn off.

OPERATING PROCEDURES
MP34.3300
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. If equipped with
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,
9. The system should now be repaired before using again.
3. Using the diagrams below identify the style and location
5. Repeat the process by identifying then opening the two
rear control valves.
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 front jack control 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 correct valves.
Slowly turn the manual valve releases counter clockwise
until the jacks start to retract. Hitch the trailer to the tow
1 full turn
4 and 1/2 turns
HWH Corporation customer service.
FOR TRAILERS WITHOUT LOCK VALVE
RR RF LR
LF
VALVE ARRANGEMENT
TRAILER
RIGHT
REAR
FRONT
RIGHT
LEFT
FRONT REAR
LEFT
landing gear, lower the landing gear to support the trailer
while manually retracting the jacks.
NOTE: The stop rods must be returned to the travel
position before retracting the front jacks.
vehicle during this operation if the vehicle is not equipped
8. Retract all landing gear before traveling.
with an alternate landing gear.

OPERATING PROCEDURES
MP34.3301
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. If equipped with
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,
9. The system should now be repaired before using again.
3. Using the diagrams below identify the style and location
5. Repeat the process by identifying then opening the two
front control valves. Hitch the trailer to the tow vehicle
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 rear jack control 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 rear jacks by opening the correct 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.
FOR TRAILERS WITH LOCK VALVE
RR LR
RF
LF
LOCK
VALVE ARRANGEMENT
TRAILER
RIGHT
REAR
REAR
LEFT
LEFT
FRONT FRONT
RIGHT
landing gear, lower the landing gear to support the trailer
while manually retracting the jacks.
NOTE: The stop rods must be returned to the travel
position before retracting the front jacks.
during this operation if the trailer is not equipped with an
8. Retract all landing gear before traveling.
LARGE STYLE WITH T-HANDLE
VALVE RELEASE
alternate landing gear.

MAINTENANCE
All major components of the system can be replaced
with rebuilt units or can be sent to HWH CORPORATION to
be rebuilt, when the system is out of warranty.
MP44.0004
05MAR07
NOTE:
OIL LEVEL
UNUSUAL CONDITIONS
STOP ROD POSITION
RETAINING PIN
STOP ROD
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 units are fully retracted
before checking the hydraulic oil level. To check the oil
supply, remove the breather plug 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.
In general, to insure the smooth operation of the leveling
system, it is a good idea to occasionally check the individual
leveling units to prevent problems. This is especially true
under the unusual conditions stated in the following:
If driving conditions are unusually muddy, the units 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 unit if they become excessively muddy.
In wet or icy weather leveling units may become encrusted
with ice. This may cause the leveling system to function
improperly. To eliminate this problem, periodically check the
leveling units and break loose any ice which may be causing
improper operation.
The stop rods and retaining pins on the front jacks must be
kept in good operating condition. Clean and lubricate the
rod and retaining pin regularly.
Do not move the trailer while the leveling units are still in
contact with the ground. Visually check to see if the leveling
units have returned to the STORE/TRAVEL position before
moving the trailer.

MAINTENANCE/SERVICE
SENSING UNIT ADJUSTMENT
Level the vehicle by placing a bubble level in the center of
the freezer floor or upon whichever surface within the vehicle
that is to be level. Using the Leveling System and the bubble
level, ignoring the yellow LEVEL lights on the Touch Panel,
level the vehicle until the bubble is centered.
The Sensing Unit is mounted inside the Control Box. The
Control Box is mounted to the power unit/valve assembly.
NOTE: If opposing LED’s are lit, there is a problem with
the Sensing Unit.
If LED (A) is lit: Turn the adjustment screw COUNTER
CLOCKWISE until the LED is off.
If LED (C) is lit: Turn the adjustment screw CLOCKWISE
until the LED is off.
If LED (B) is lit: Turn the adjustment nut COUNTER
CLOCKWISE until the LED is off.
until the LED is off.
If LED (D) is lit: Turn the adjustment nut CLOCKWISE
ADJUSTMENT
NUT (5/16")
TOP VIEW - SENSING UNIT
ADJUSTMENT
NUT ADJUSTMENT SCREW
D
C
A
B
CONTROL
BOX WALL
LED’S - LOCATION SIDE VIEW - CONTROL BOX
MAY BE DIFFERENT
07MAR07
MP44.1500
There are four LED’s on the Sensing Unit, A,B,C and D. Refer
to the drawing below. The Sensing Unit is adjusted by turning
the adjustment nut to turn out LED’s B and D. The adjustment
screw will turn out LED’s A and C. If the adjustment nut has
to be turned more than 1/2 flat or the adjustment screw has to
be turned more than 3/4 turn to turn the LED out, there may
be a problem with the Sensing Unit or the mounting of the
Control Box. If two LED’s are on, it is best to make the B-D
adjustments first, then hold the adjustment nut from moving
ADJUSTMENT NUT
while making the A-C adjustment.
ADJUSTMENT
SCREW (Phillips or 1/4")
NUT (7/8" or 3/4")
ADJUSTMENT
With the vehicle level according to the bubble level, if there
are no yellow lights lit on the Touch Panel, the sensing unit is
properly adjusted. If there are yellow LEVEL lights lit on the
Touch Panel, manual adjustments to the Sensing Unit are
needed. A 7/8", 3/4" or 5/16" socket w/driver or box end
wrench and a philips screw driver will be needed.
IMPORTANT: When all 4 LED’s are off, move the
vehicle to an unlevel position so one or two yellow
lights are on. Level the vehicle according to the yellow
LEVEL lights. Recheck the level. If more adjustment is
needed, DO NOT try to adjust the sensing unit until the
yellow level lights go out, instead just "tweak" the
sensing unit, ignoring the LED’s on the sensing unit.
Example: After the initial adjustment and releveling
the vehicle, the front is still low. This means the front
yellow level light is turning off too soon. Determine
which sensing unit light is the front light, A-B-C or D.
Move the adjustment for that light very, very, slightly in
the OPPOSITE direction that is given in the above
instructions for LED’s A, B, C, and D. This will allow
the front yellow light to stay on slightly longer to bring
the front up more. Again, unlevel the vehicle then
relevel the vehicle using the yellow level lights on the
touch panel. Recheck with a level. Repeat the
"tweaking" process until the system levels the vehicle
properly.

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