HWH 725 SERIES User manual

OPERATOR’S MANUAL
ML54599/MP04.356
1
03DEC1
4
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
W
CORPORATION
HH
R
RETRACT
EXTEND
PROCEDURE
INCORRECT
CAUTION!
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
HWH COMPUTERIZED LEVELING
AUTO
STORE
LEVEL
AUTO
CANCEL
R
SLOPE
EXCESS
MANUAL
RETRACT
EXTEND
Auxiliary Hand Pump
Four Single - Acting Jacks
FEATURING:
BI-AXIS Hydraulic Leveling
Touch Panel Leveling Control
R
AP54598
HWH 725 Series, Computer-Controlled
Hydraulic Leveling System
R
For Trailers

WARNING !
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
MP14.000
3
08DEC1
0
IMPORTANT: IF VEHICLE IS EQUIPPED WITH A ROOM EXTENSION, READ ROOM EXTENSION SECTION BEFORE
OPERATING LEVELING SYSTEM.
WHILE HITCHING OR UNHITCHING, AVOID AREAS WHERE BODY MAY BE CRUSHED BY SUDDEN DROPPING OR SLIDING
OF THE TRAILER.
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.

MP24.228
3
05MAR1
0
"CANCEL" BUTTON:
automatic hydraulic operation.
ON/AUTO ( ) BUTTON:
"STORE" BUTTON:
"AUTO STORE" button. This button is used to automatically
retract the jacks.
JACK DOWN LIGHTS:
INCORRECT OPERATION LIGHT:
"TRAVEL MODE" LIGHT:
has no function.
CONTROL FUNCTIONS
INDICATOR LIGHTSCONTROL BUTTONS
Push the "CANCEL" button to stop
The store indicator light is above the
This LED, if present,
EXTEND BUTTONS (UP ARROWS):
RETRACT BUTTONS (DOWN ARROWS): LEVELING LIGHTS:
These buttons will
extend the jacks to lift the vehicle.
These buttons
will retract the jacks 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 when the Master Power
operation button. The on indicator light is above the (I)
CONTROL IDENTIFICATION
625/2000 SERIES LEVELING SYSTEM
COMPUTER-CONTROL
switch is on. When a jack is extended 1/4 to 1/2 inch,
button.
HYDRAULIC OPERATIONS ( ) LIGHT: This light
indicates that the panel is active.
STORE LIGHT: This light indicates that the system
is in STORE mode.
SEE MANUAL LEVELING PROCEDURE.
to the leveling system. This switch controls powerMASTER POWER SWITCH:
MASTER POWER SWITCH
RETRACT
EXTEND
EXCESS SLOPE Indicator light
TRAVEL MODE Indicator light
CANCEL button
AUTO LEVEL / STORE
AUTO STORE Button
STORE Indicator light
AUTO LEVEL Button
Indicator light
AUTO LEVEL Indicator light
OFF
JACK DOWN Indicator light
LEVEL SENSING Indicator light
LOWER LEFT SIDE Manual button
LOWER REAR Manual button
RAISE REAR Manual button
RAISE FRONT Manual button
LOWER RIGHT SIDE
RAISE RIGHT SIDE
LOWER FRONT Manual button
RAISE LEFT SIDE Manual button
Manual button
ON
RETRACT
(4) red
EXTEND
(4) yellow
Manual button
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
CAUTION!
CANCEL MODE
TRAVEL
AUTO
STORE
LEVEL
AUTO
HWH COMPUTERIZED LEVELING
PROCEDURE
INCORRECT
SLOPE
EXCESS
R
MANUAL
This light indicates
an incorrect operation that cancels automatic leveling or
store procedures.
it’s warning light will come on.
(Not on newer panels)
INCORRECT PROCEDURE

MP25.9995
14MAR12
CONTROL IDENTIFICATION
PUMP RUN TIME
SYSTEM VARIATIONS FOR PUMP RUN TIME
Contact HWH corporation to get specific information about the system in this vehicle.
No matter what HWH system is on the vehicle, the pump should not be ran for more than four minutes
(3" motors) or six minutes (3.7" or 4.5" motors) without allowing the pump motor to cool for thirty minutes.
Continuous operation of the pump motor without allowing the motor to cool can damage the pump motor.
Some HWH systems are equipped with a lighted reset switch.
If the processor turns the pump off because the run time has
been exceeded, the light in the reset switch will turn on. The
With some systems, when the processor has turned the pump off because the run time has been exceeded, power
to the HWH system must be turned off and back on before the system will operate. With motorized vehicles, turn the
ignition off and back on. With non-motorized vehicles, turn the master power switch for the HWH system off and back
DO NOT continue without allowing the pump motor to cool for thirty minutes.
When operating some leveling systems manually or operating the room extensions, the pump will turn off and back
on while pushing the control button when the pump run time has been exceeded.
the pump motor to cool for thirty minutes.
Some systems can be turned back on immediately after the processor turns the pump off.
back on or run the pump without allowing the pump motor to cool for thirty minutes.
Some systems with rooms run the rooms separate from the system processor. These systems do not monitor pump
run time when operating the rooms.
pump motor to cool for thirty minutes.
The HWH systems with a computer processor monitor the pump run time and will turn the pump off if the run time exceeds a
specified time. This time can vary with different systems. Due to available electronics or system design, the pump run time
programs will also vary. Leveling systems and room extensions that are not controlled by a system processor have no pump
run time protection.
thirty minutes.
Pump motors used with HWH leveling systems and room extension systems come in 3 different diameters; 3", 3.7" and 4.5".
Contact the vehicle manufacturer or HWH for help with identifying the motor size.
runs for more than four minutes with a 3" motor; or six minutes with a 3.7" or 4.5" motor that the motor is allowed
to cool for thirty minutes before continuing. Continuous operation of the pump motor without allowing the motor
PUMP RUN TIME
It is important that any time the pump
to cool can damage the motor.
DO NOT run the pump more than four or six minutes without allowing the pump motor to cool for
DO NOT run the pump more than four or six minutes without allowing the
DO NOT turn the system
DO NOT continue without allowing
on.
system will not operate until the reset switch is pushed.
DO NOT continue without allowing the pump motor to
cool for thirty minutes. LIGHTED RESET SWITCH
For cold weather information see "COLD WEATHER OPERATIONS" below.
COLD WEATHER OPERATIONS
HWH leveling and room extension systems are designed to function in cold weather down to 0 degrees Fahrenheit. Below
freezing (32 degrees Fahrenheit) the jacks or rooms will operate slower than usual.
For operation in temperatures dropping below -20 degrees Fahrenheit, it is necessary that the system is equipped with oil
designed for extreme cold weather application such as a synthetic oil. (Contact HWH for recommendations.)
DO NOT run the pump motor continuously.
Continuous operation of the pump with slow moving jacks or rooms in cold weather, without allowing the pump motor to
cool will cause the pump motor to burn up and damage the pump assembly.
It is important that any time the pump runs for more than four minutes
continuing. Continuous operation of the pump motor without allowing the motor to cool can damage the motor.
with a 3" motor; or six minutes with a 3.7" or 4.5" motor that the motor is allowed to cool for thirty minutes before

OPERATING PROCEDURES
MP34.0221A
10SEP1
4
GENERAL INSTRUCTIONS
PREPARATION FOR TRAVEL
If parking on soft ground or asphalt paving, wood blocks or
pads must be placed under the jacks.
Press the "CANCEL" button and turn the master power switch
"OFF" at any time to stop the operation of the system.
Before traveling, the red jack warning lights must be off
and the "TRAVEL MODE" 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 MODE" light is not lit, the system
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 be checked.
TO CHECK THAT ALL JACKS ARE FULLY RETRACTED
LIGHTS. IT IS THE OPERATOR’S RESPONSIBILITY
HAZARD. DO NOT RELY SOLELY UPON WARNING
AND OR THE VEHICLE AND CREATE A DRIVING
EXTENDED CAN CAUSE SEVERE DAMAGE TO THE JACKS
MOVING THE VEHICLE WITH THE LEVELING JACKS
VEHICLE IS EQUIPPED WITH STRAIGHT-ACTING JACKS
.
THE GROUND OR IN THE EXTEND POSITION. THIS
THE LEVELING JACKS ARE STILL IN CONTACT WITH
DO NOT MOVE THE VEHICLE WHILEWARNING:
Maintain adequate clearance in all directions for vehicle, room
extensions, awnings, doors, steps, etc. Vehicle may move in
any direction due to jacks extending or retracting, settling of
the jacks or the vehicle, equipment malfunction, etc..
Any room extension should be fully retracted before traveling.
DO NOT MOVE THE VEHICLE IF ONE
OR MORE JACKS ARE EXTENDED TO THE GROUND.
WARNING:
needs to be serviced. INTO THE STORE/TRAVEL POSITION.
Any time the "AUTO LEVEL" button has been pushed, push
the "STORE" button before traveling.
ROOM EXTENSION PROCEDURES
the vehicle before extending the room.
IMPORTANT: It is recommended to level and stabilize
IMPORTANT: Extending or retracting any leveling jacks
when the room is extended is not recommended.
IMPORTANT: If the vehicle is equipped with a room
extension read this section carefully.
when the vehicle is supported by the leveling system.
IMPORTANT: Do not use a room extension support
Refer to the vehicle owner’s manual for proper operation o
f
room extensions.
on for the leveling system to operate.
The HWH or OEM supplied master power switch must be
NOTE: Newer panels may not have the "TRAVEL MODE" light.

OPERATING PROCEDURES
MP34.0222A
14NOV13
INCORRECT PROCEDURE LIGHT
NOTE: Early systems have a "NOT IN PARK/BAKE"
light instead of an "INCORRECT PROCEDURE" light.
These early systems will react to the situations noted
in this section, but the "NOT IN PARK/BRAKE" will NOT
turn on and the front warning lights will NOT flash.
There are several situations that prevent the "AUTO LEVEL"
or "AUTO STORE" buttons from functioning or that will stop
the auto leveling process. When these situations occur,
the system turns the "INCORRECT PROCEDURE" light
on steady and flashes the two front RED warning lights for
10 seconds. After 10 seconds the indicator lights will then
The following situations will turn the "INCORRECT
PROCEDURE" light on and flash the front warning
lights.
return to their normal state. The "INCORRECT PROCEDURE"
1. The "AUTO LEVEL" button will not function unless at
least one front jack is firmly on the ground supporting the
weight of the trailer.
2. If the rear YELLOW level light is on, the "AUTO LEVEL"
button will not function unless at least one front jack is firmly
on the ground and both front warning lights are on steady.
3. If the front of the trailer is lowering during the auto level
procedure and either front warning switch turns off, the
system will shut down.
4. The "AUTO STORE" button will not function if either front
jack is supporting any of the trailer weight or if either frontlights will go out. The front warning lights will remain on if
the jacks are extended. jack pressure switch is on. If the vehicle is equipped with
double - acting front jacks or landing gear, one or both front
jack pressure switches may remain on if the front manual
DOWN ARROW is not used to hitch the trailer to the tow
vehicle even if both front jacks are not on the ground.
If the "INCORRECT PROCEDURE" light flashes when the
"STORE" button is pushed after the trailer is hitched to the
tow vehicle, push the front DOWN ARROW button for
several seconds then retry the "STORE" button.
NOTE: No touch panel buttons will function while
the "INCORRECT PROCEDURE" light is on.

OPERATING PROCEDURES
SET UP AND AUTOMATIC LEVELING PROCEDURE
Trailer must be unhitched from the tow vehicle before
leveling. 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.
NOTE: Refer to the trailer manufacturer owner’s manual
IMPORTANT: Overheating and excessive current drain
14NOV13
MP34.2714A
extend the HWH front jacks to the ground and retract the
auxiliary jacks before the leveling system is used for leveling.
vehicle and then extend any remaining jacks for stabilizing.
The system will automatically extend the jacks to level the
1. Turn the HWH master power switch on.
2. Use the front UP arrow manual button to extend the
front jacks to unhitch the trailer.
The system will level the trailer front to rear (if needed)
before leveling side to side. If the rear yellow level indicator
is on, the system will lower the front of the trailer to level the
trailer. If the front jacks are Double - Acting jacks, the pump
will run while the front is lowering. After the system has
finished leveling and stabilizing, it will automatically shut off.
NOTE: The system will only lower the front of the trailer if
the rear level light is on when the "AUTO LEVEL" button
is pushed. If the rear light is not on or goes out while
lowering the trailer, no lowering procedure is used after
that no matter what level light may come on.
If either front red warning light goes out while the front
is lowering, the system will discontinue the leveling
procedure and shut off. The "INCORRECT PROCEDURE"
NOTE: Before unhitching the trailer, the operator may
want to check the jacks and place pads under the jacks
if the ground will not support the vehicle.
IMPORTANT: The "AUTO LEVEL" button will not
function unless at least one front jack is firmly on the
ground, supporting the weight of the trailer.
If the rear yellow level indicator is on, the "AUTO LEVEL"
button will not function unless at least one front jack is
firmly on the ground supporting the trailer and both front
red warning lights are on.
If either of the above situations are encountered, the
"INCORRECT PROCEDURE" light will come on steady
for 10 seconds. Both front warning lights will flash
while the "INCORRECT PROCEDURE" light is on.
After 10 seconds, the "INCORRECT PROCEDURE"
light will shut off and the front warning lights will
stop flashing. When the situation has been corrected,
the "AUTO LEVEL" button will function.
3. Push the "AUTO LEVEL" button. The AUTO LEVEL light
will flash and the auto leveling procedure will begin.
4. Make sure the HWH master power switch is off any
time the touch panel is not active whether the jacks are
extended or retracted.
light will come on with the two front warning lights
blinking for 10 seconds.
the vehicle if the "EXCESS SLOPE" light comes on. One or
operate when the EXCESS SLOPE light is on.
to the MANUAL LEVELING section. Manual leveling will
level position or level the trailer as close as possible according
AND STORING JACKS section. Move the trailer to a more
turning the red warning lights out. Refer to the HITCHING
jacks have been fully retracted using the "STORE" button,
will remain on if there is power to the control box, until the
the "EXCESS SLOPE" light on. The "EXCESS SLOPE" light
more jacks may be extended. The system will shut off leaving
turning the yellow level light out. The system will not stabilize
come on. Excess slope is two jacks fully extended without
unable to level the coach, the "EXCESS SLOPE" light will
In the event the jacks areEXCESS SLOPE SITUATION:
During the stabilize portion of the auto leveling sequence,
first the system will check the right rear jack pressure switch
and extend the jack as necessary. If or when the right rear
pressure switch is satisfied, the system checks the left rear
jack pressure switch and extends the jack as necessary. If
or when the left rear pressure switch is satisfied, the system
will check both front jack pressure switches at the same time.
NOTE: No touch panel buttons will function while
the "INCORRECT PROCEDURE" light is on.

MP34.2813B
10SEP1
4
WARNING:
HITCHING AND STORING JACKS
THE OPERATOR MUST BE SURE THAT
THERE ARE NO OBJECTS UNDER THE TRAILER AND
THAT ALL PEOPLE ARE CLEAR OF THE TRAILER.
OPERATING PROCEDURES
625/2000 SERIES LEVELING SYSTEM
IMPORTANT: The "STORE" button will not function
until the weight of the trailer is off the front jacks. 3. NOTE: The rear jack must have ground clearance during the hitching procedure.
4. Hitch the trailer to the tow vehicle according to the
manufacturers instructions. Use the existing landing
gear or the front UP (EXTEND jacks) and DOWN
(RETRACT jacks) arrows.
1. After the trailer is securely hitched to the tow vehicle,
and the weight of the trailer is off of the front jacks, push
the "STORE" button. All 4 jacks will retract.
HITCHING
1. The HWH master switch must be on to hitch
the trailer and store the jacks.
The pump never runs during the auto store procedure.
light goes out. If any warning light remains on, the system
will stay in the auto store mode for (20) minutes and then
shut off.
The manual UP (extend jacks) and DOWN (retract
jacks) arrows will function anytime the master power
switch is on if the "AUTO LEVEL" or AUTO STORE
lights are not flashing.
STORING JACKS
NOTE: If the trailer is equipped with an air suspension,
it is recommended to not connect the tow vehicle air
supply to the trailer until the trailer is hitched to the
tow vehicle and the jacks are not touching the ground.
and the green "TRAVEL MODE" light is on.
lights are out, the jacks are in the STORE/TRAVEL position
3. The trailer can be moved as soon as the red warning
2. Turn the HWH master power switch off before traveling.
OR SECURELY SUPPORTED BY THE EXISTING
IF THE TRAILER IS HITCHED TO A TOW VEHICLE
ONLY USE THE "STORE" BUTTON
the system. The system must be allowed to
CHECK THAT ALL JACKS ARE FULLY RETRACTED INTO
WARNING LIGHTS. IT IS THE OPERATOR’S RESPONSIBILITY TO
CREATE A DRIVING HAZARD. DO NOT RELY SOLELY UPON
SEVERE DAMAGE TO THE JACKS AND OR THE TRAILER AND
WITH THE LEVELING JACKS EXTENDED CAN CAUSE
WITH STRAIGHT-ACTING JACKS. MOVING THE TRAILER
OR IN THE EXTEND POSITION. THIS TRAILER IS EQUIPPED
LEVELING JACKS ARE STILL IN CONTACT WITH THE GROUND
DO NOT MOVE THE TRAILER WHILE THE
DO NOT push the "OFF" button or turn power off to
system while the "STORE" indicator light is blinking.
IMPORTANT: DO NOT interrupt power to the leveling
completely finish the STORE mode.
THE STORE/TRAVEL POSITION.
LANDING GEAR.
WARNING:
WARNING:
NOTE: If the weight of the trailer is not removed from
both front jacks, the "AUTO STORE" button will not
function. If the "AUTO STORE" button is pushed, the
"INCORRECT PROCEDURE" light will come on steady
with the two front warning lights flashing for 10 seconds.
the "INCORRECT PROCEDURE" light is on.
NOTE: No touch panel buttons will function while
The system shuts off (1) minute after the last red warning
2. Push the rear down arrow (RETRACT button) until
the rear jack down warning lights are out.

OPERATING PROCEDURES
MANUAL LEVELING
Trailer must be unhitched from the tow vehicle before
leveling. 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.
3. A lit yellow LEVEL light indicates that the side, end or
corner of the trailer is low.
4. After the trailer is level, the jacks not used for leveling
may be extended until they touch the ground. This provides
additional stability against wind and activity in the trailer.
NOTE: Refer to the trailer manufacturer owner’s manual
IMPORTANT: Overheating and excessive current drain
14NOV13
MP34.3019B
extend the HWH front jacks to the ground and retract the
auxiliary jacks before the leveling system is used for leveling.
Jacks used to stabilize the trailer should lift the trailer
1. Turn the HWH master key switch on.
2. Use the front UP arrow buttons to extend the front
jacks and unhitch the trailer.
5. Turn the HWH master power switch off.
Pushing the up arrow for
too uneven, the jacks may not have enough stroke to level
level light priority when leveling the trailer. If the ground is
out all the yellow lights. Always give a front or rear yellow
jack pair to level the vehicle. Extend jacks as needed to put
corresponding yellow level lights will extend that jack or
If the rear yellow level light is on,
it is recommended to push the front down arrow until the
rear yellow light goes out.
the trailer. The trailer may have to be moved.
about 3/4 inch.
the "INCORRECT PROCEDURE" light is on.
NOTE: No touch panel buttons will function while

OPERATING PROCEDURES
MP34.9901
23SEP13
AUXILIARY HAND PUMP OPERATION
The auxiliary hand pump can be used to extend or retract
the landing gear, jacks or room extensions anytime the pump
HITCHED TO THE TOW VEHICLE BEFORE OPENING
SUPPORTED BY AUXILIARY STANDS OR SECURELY
ANY VALVES.
WARNING: THE VEHICLE SHOULD BE
IMPORTANT: FOLLOW THE "SET UP" AND
"PREPARATION FOR TRAVEL" PROCEDURES
WHEN USING THE AUXILIARY HAND PUMP.
AUXILIARY
HAND PUMP
HANDLE
The auxiliary hand pump is a two stage pump that will produce
enough pressure to extend the landing gear and lift the vehicle
as well as retract the landing gear. When operating the auxiliary
pump to lift the vehicle or when the jacks are fully retracted, the
pump handle will seem to "snap" as the pump goes to the
second stage. The pumping action will be easier at first as the
second stage starts to create more pressure.
To operate the auxiliary hand pump, open the appropriate
solenoid valve. Insert the hand pump handle into the handle
receptacle and move the handle in an up and down motion.
The auxiliary hand pump may work easier if only one
valve is open at a time. Be careful to not twist the
vehicle if only one solenoid valve is open.
It is recommended to operate the auxiliary hand
pump occasionally to check it’s operation.
FRONT VIEW END VIEW
CLOSE
OPEN
OPERATING
MOTION
will not function.
RELEASE CAM
IMPORTANT: ONLY MOVE THE RELEASE CAM
IN THE DIRECTION SHOWN. MOVING THE CAM
IN THE OPPOSITE DIRECTION CAN DAMAGE
THE VALVES.
RET
JACK
EXT
P42088
LEFT
RET
P42089
RIGHT
EXT JACK
EXT
B-STYLE
RET
P42091
ROOM
TOP VIEW
NOTE: If a room cannot be retracted using the
auxiliary hand pump, see "MANUAL ROOM
RETRACTION PROCEDURES".
NOTE: The hand pump will swivel to any position
which will ease the operation of the hand pump.
number of functions and the items controlled by each pair of
valves one each for the extend and retract procedures. The
NOTE: Each hydraulic function requires a pair of solenoid
solenoid valves will very for each system. The diagrams shown
on this page represent a (3) function system of (2) jacks and
(1) room as indicated by the labels shown in FIG 1. Use the
labels specific to your system when following these procedures.
FIG 1
ROOM
B-STYLE
JACK
RIGHT
EXT
RET
RET
P42089
EXT
P42091
IF A LARGE VALVE IS USED, OPEN THE VALVE
BY REMOVING THE PLASTIC PLUG THEN TURN
THE 1/4" VALVE RELEASE NUT NO MORE THAN
2 FULL TURNS COUNTER CLOCKWISE.
PLUG
PLASTIC
Room control solenoid valves may be located at the
synchronizing cylinder, not on the pump manifold.

MAINTENANCE
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 cap from the top of the
hydraulic oil reservoir. The oil level should be approximately
one inch below the top of the reservoir when adequately filled.
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
Do not move the trailer while the leveling units are still in
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.
contact with the ground. Visually check to see if the leveling
units have returned to the STORE/TRAVEL position before
moving the trailer.
MP44.000
2
21NOV1
6
UNUSUAL CONDITIONS
NOTE:
OIL LEVEL
improper operation.
FLUID: HWH Specialty Hydraulic Oil is recommended. In a
n
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 dy
e
emergency Dexron automatic transmission fluid can be used
.
seals.
NOTE:
should be washed with soap and water as soon as possible
when traveling in winter conditions.
on highways in the winter, leveling system components
Due to chemicals now usedWINTER WEATHER DRIVING:
JACK PRESSURE SWITCH ADJUSTMENT
may not come all the way down and lift as necessary.
be lifted too high. If the switches are set too low the jacks
The switches are adjustable. If set too high, the trailer will
front when checking the switches.
The trailer should be completely loaded especially at the
approximately 1/2".
The jacks should lift the trailer slightly when stabilizing,
trailer is properly stabilized after the leveling process is
The jack pressure switches are used to make sure the
complete.
LOCKING
SWITCH
BODY
NUT SEALING
WASHER
not twisted. Loosen the locking nut. Turn the threaded
turn before checking the system. Remember to tighten the
clockwise to decrease pressure. Use no more than a half
adjustment clockwise to increase pressure or counter-
Before adjusting the switch, unplug the switch so the wire is
ADJUSTMENT
PRESSURE
locking nut when finished.
BODY
WINTER WEATHER DRIVING
anti-icing / deicing agents, thoroughly wash jacks with warm
components, such as HWH jacks.
To help reduce the corrosion of jacks after exposure to
have dried. This can facilitate corrosion of metallic
continue to absorb moisture from the air even after they
Anti-icing / deicing agents when splashed on your vehicle,
soapy water.

MAINTENANCE
MP44.0009
15JAN10
PRIMING THE HAND PUMP
JACK CONTROL HYDRAULIC SWITCH
NEUTRAL POSITION
To prime the hand pump, it will be necessary to remove a
hose from one of the jacks. One of the front jacks would be
HAND PUMP
HANDLE
MOTION
OPERATING
If the system has Double-Acting cylinders on the front,
remove the rod end hose from either of the front jacks.
Place the end of the hose in a bucket. Make sure the
tank is at least half full. Pump the hand pump until a
healthy flow of oil is coming from the hose.
Reattach the hose and retry the hand pump. Repeat the
procedure if the hand pump does not move the jacks.
TANK
best, but use the easiest hose to get to.
IMPORTANT: DO NOT ALLOW THE FLUID LEVEL IN
THE TANK TO LOWER MORE THAN 1 INCH BEFORE
ROD END
CAP END
ADDING FLUID.
If the system has only Single-Acting jacks with return springs,
remove the easiest hose to access and place the end in a
bucket. Using the release cam, manually open the EXTEND
solenoid valve for that jack (if equipped with solenoid valves)
or move the jack control hydraulic switch to "EXTEND" for
that jack. Make sure the tank is at least half full. Pump the
hand pump until a healthy flow of fluid comes from the hose.
procedure if the hand pump does not move the jacks.
Reattach the hose and retry the hand pump. Repeat the
THE TANK TO LOWER MORE THAN 1 INCH BEFORE
IMPORTANT: DO NOT ALLOW THE FLUID LEVEL IN
ADDING FLUID.
EXTEND
POSITION
TO
CLOSED
HANDLE
HAND PUMP
TANK
EXT
RET
EXTEND SOLENOID VALVE
SINGLE ACTING JACKS
(CAP END HOSE -
EXT
EXT
EXT
EXT
RET
RET
RET
RET
OPEN CLOSE
TO
VALVE RELEASE CAM
SHOWN IN
POSITION OPEN
POSITION
SHOWN IN
(CAP AND ROD END HOSES)
DOUBLE-ACTING JACKS
NO ROD END HOSE -
WITH RETRACT SPRINGS)

SENSING UNIT MAINTENANCE/SERVICE
SENSING UNIT ADJUSTMENT / WITH ADJUSTING ENHANCEMENT
NOTE: If opposing LED’s are lit, there is a problem with
the Sensing Unit.
If LED (A) is lit: Tighten adjustment screw number 1
until the LED is off.
If LED (C) is lit: Loosen adjustment screw number 1
until the LED is off.
If LED (B) is lit: Loosen adjustment screw number 3
until the LED is off.
until the LED is off.
If LED (D) is lit: Tighten adjustment screw number 3
09NOV10
MP44.1511
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.
SENSING UNIT ACCURACY TOLERANCE
The sensing unit has an accuracy tolerance of ± 5.4 inches front to rear and
INSTRUCTION SHEET
± 1 inch side to side on a 36 foot vehicle. Typical leveling results will be better.
IMPORTANT: THE SENSING UNIT MOUNTING SPRINGS
SHOULD BE COMPRESSED ABOUT 1/2 THEIR FREE
LENGTH. SCREW NUMBER 2 SHOULD NOT BE TURNED
MOUNTED BELOW
FRONT
MOUNTING SURFACE
(3) MOUNTING
(3) MOUNTING
SCREWS
SPRINGS
THIS
SIDE
UP
LED A - FRONT OF VEHICLE
LED B - LEFT SIDE OF VEHICLE
LED C - REAR OF VEHICLE
LED D - RIGHT SIDE OF VEHICLE
REMOTE MOUNTED "POTTED" ELECTRONIC SENSING UNIT
WHILE ADJUSTING THE SENSING UNIT. AFTER
ADJUSTING THE SENSING UNIT, BUMP THE SENSING
UNIT TO SEE THAT IT IS SETTLED TIGHT AGAINST ALL
THREE SCREW HEADS AND STILL INDICATES THAT
THE UNIT IS LEVEL.
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. It is best if the level is placed close to the
mounting area of the sensing unit. 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 ignition (motorized units) or master power switch (towable
units) must be on. Remove the "Adjusting Enhancement Cap".
DO NOT LOSE THIS CAP. There is a small pin beneath the
cap. Use a jumper wire with an alligator clip to apply a ground
to the pin. This will make the sensing unit very sensitive. The
yellow lights may "jump" around while adjusting the sensing unit.
Let the lights settle down after each adjustment. Small, gentle
turns will work best. Turn mounting screws 1 and 3 to adjust
the sensing unit. Turn screws as instructed to turn out all the
yellow LEDs. When all the LEDs are out, remove the jumper
wire and replace the adjusting enhancement cap. DO NOT
over tighten.
SENSING UNIT
BOTTOM VIEW OF
LED
3
D
C
LED
LED
ABYELLOW LEDs
2
MOUNTING/ADJUSTMENT
SCREWS (3)
1
LED
Move the vehicle to an unlevel position and level the
vehicle according to the yellow level sensing lights on
the touch panel. Readjust if necessary.
ADJUSTING
ENHANCEMENT
CAP

MP84.9999
28FEB11
VALVE RELEASE
NUT
NOTE: When opening the
valve DO NOT turn the valve
release nut more than 4 and
1/2 turns counter clockwise.
OIL LEVEL
1/4" NUT DRIVER
THE BREATHER CAP IS
LOCATED ON THE TOP
TOP OF THE RESERVOIR. BEFORE RETURNING THE
BREATHER CAP TO THE RESERVOIR, REMOVE ANY
VALVE RELEASE
NUT
counter clockwise. Damage to
nut more than 2 full turns
NOTE: When opening the valve
DO NOT turn the valve release
REMOVE TO GAIN
ACCESS TO THE 1/4"
VALVE RELEASE NUT
2 1/4" DIAMETER SOLENOID VALVE
1 1/2" DIAMETER SOLENOID VALVE
GROOVES
SIDE OF THE POWER
UNIT RESERVOIR
NOTE: The cam release may be
rotated in any direction on the
valve. DO NOT assume that
pushing down will open the
1 1/2" DIAMETER SOLENOID VALVE
valve. Pushing the cam in the
2 1/4" DIAMETER SOLENOID VALVE
the valve may result.
Damage to the valve may FILL BETWEEN
SOLENOID VALVES WITH CAM RELEASE
wrong direction could damage
the valve.
NOTE: The cam release may be
rotated in any direction on the
valve. DO NOT assume that
pushing down will open the
valve. Pushing the cam in the
wrong direction could damage
the valve.
result.
a large style 12 volt valve with a large style
valve with a small style 12 volt valve. Replace
considered when replacing any HWH hydraulic
solenoid valve. Replace a small style 12 volt
Valve size and voltage are still factors to be
replacements for all previous styles of
The cam release style valves are direct
HWH hydraulic solenoid valves.
12 volt valve. This is true for 24 volt valves
also.
turn out the old valve, confirm that no o-ring
stress on the wires at the point where they
the wires to the valve body to keep the wires
exit the valve body. Use a wire tie to secure
After installing the valve and without creating
Valve installation has not changed, simply
debris has been left in the manifold block
and turn in the new valve.
from being pinched beneath the cam
mechanism during operation.
WIRE TIE
WIRE TIE
HYDRAULIC SOLENOID VALVE
INFORMATION INSERT
INDENTIFICATION - MANUAL OPERATIONS - REPLACEMENT
Manual retract
VALVE OPEN
CAM RELEASE
CAM RELEASE
Default position
VALVE CLOSED
CAM RELEASE
Default position
VALVE CLOSED
position
CAM RELEASE
VALVE OPEN
position
Manual retract
REPLACEMENT VALVES MAY HAVE A VALVE RELEASE NUT OR RELEASE CAM
SOLENOID VALVES WITH 1/4" NUT RELEASE
1/4" NUT DRIVER, CLEAN ANY DEBRIS FROM THE
CAP, EITHER TO CHECK THE OIL LEVEL OR TO USE
IMPORTANT: PRIOR TO REMOVING THE BREATHER
INCLUDING DEBRIS INSIDE THE 1/4" NUT DRIVER.
PLASTIC PLUG:
PAINT CHIPS OR OTHER DEBRIS FROM THE DIPSTICK