HWH 625 Series User manual

OPERATOR’S MANUAL
ML38142/MP04.2528
10SEP09
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
625 SERIES LEVELING SYSTEM
HWH COMPUTER-CONTROLLED
R
Straight-Acting Jacks
AP38141
R
HWH COMPUTERIZED LEVELING
CAUTION!
OFF
TRAVEL
MODE
NOT IN
PARK/
BRAKE
EXCESS
SLOPE
Front Jack Equalization
FOR FIFTH WHEEL RVS
AUTO
ON
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
STORE
W
CORPORATION
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.

MP24.2281
18DEC09
"OFF" BUTTON:
operation.
ON/AUTO (I) BUTTON:
"STORE" BUTTON:
"STORE" button. This button is used to automatically retract
the jacks.
JACK DOWN LIGHTS:
"NOT IN PARK/BRAKE" LIGHT:
"TRAVEL MODE" LIGHT:
when there is power to the control box, if the jacks are
CONTROL FUNCTIONS
INDICATOR LIGHTSCONTROL BUTTONS
Push the "OFF" button to stop hydraulic
The store indicator light is above the
N/A.
This indicator light will be on
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 only when the system is on,
operation button. The on indicator light is above the (I)
CONTROL IDENTIFICATION
625/2000 SERIES LEVELING SYSTEM
COMPUTER-CONTROL
and the jacks are extended 1/4 to 1/2 inch.
button.
HYDRAULIC OPERATIONS (I) LIGHT:
HWH COMPUTERIZED LEVELING
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
CAUTION!
HYDRAULIC
Indicator light
STORE
Indicator light
"TRAVEL MODE"
ON/AUTO
Indicator light
OPERATION
Indicator light
"NOT IN PARK"
Button
"OFF"
Button
"STORE"
Button
Manual button
LOWER LEFT SIDE
Manual button
RAISE LEFT SIDE
Indicator light
"EXCESS SLOPE"
EXCESS
STORE
AUTO
OFF
ON
TRAVEL
MODE
SLOPE
NOT IN
BRAKE
PARK/
R
Manual button
LOWER REAR
Manual button
RAISE REAR
(4) yellow
Indicator light
LEVEL SENSING
Manual button
LOWER RIGHT SIDE
Manual button
RAISE RIGHT SIDE
Indicator light
JACK DOWN
Manual button
RAISE FRONT
Manual button
LOWER FRONT
(4) red
This light indicates
that the panel is active.
STORE LIGHT: This light indicates that the system
is in STORE mode.
SEE MANUAL LEVELING PROCEDURE.
retracted and there are no red WARNING lights on.
ONOFF
MASTER POWER
SWITCH (OPT.)
HWH. The system should have a master power switch.
to the HWH control system. This is an optional switch from
This switch controls powerMASTER POWER SWITCH:

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
MP34.0203
15NOV07
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 "OFF" button and turn the ignition switch "OFF" at
any time to stop the operation of the system.
Any time a hydraulic leveling process is interrupted, retract
the jacks according to the JACK RETRACTION Section and
then restart the leveling process.
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 WHILECAUTION:
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.
CAUTION:
needs to be serviced. INTO THE STORE/TRAVEL POSITION.
Any time the ""I"" 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 of
room extensions.

OPERATING PROCEDURES
SET UP AND AUTOMATIC LEVELING 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.
3. Lower the front of the trailer until the front yellow level
indicator light comes on. This is done by pushing the front
RETRACT button (DOWN ARROW). The red jacks down
warning lights will light when the jacks are extended
NOTE: Refer to the trailer manufacturer instructions
IMPORTANT: Overheating and excessive current drain
15NOV07
MP34.2703
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: The front yellow LEVEL light must be on before
automatic leveling will function.
operation mode The LEVEL light will glow steady.
2. Press the "LEVEL" button to enter the hydraulic.
EXCESS SLOPE SITUATION: In the event the jacks are
unable to level the coach, the "EXCESS SLOPE" light will
come on. Excess slope is two jacks fully extended without
turning the yellow level light out. The system will not stabilize
the vehicle if the "EXCESS SLOPE" light comes on. One or
more jacks may be extended. The system will shut off
leaving the "EXCESS SLOPE" light on. The "EXCESS
SLOPE" light will remain on if there is power to the control
box, until the jacks have been fully retracted turning the red
warning lights out. Refer to the JACK RETRACTION section.
Move the vehicle to a more level position or level the vehicle
as close as possible according to the MANUAL LEVELING
section.
NOTE: The jack stop rods should be set anytime the
the retaining pin through the holes in the guide and stop rod.
guide with the nearest available hole in the stop rod. Insert
B. Lift stop rod as needed (up to 4") to align the hole in the
A. Remove retaining pin to allow stop rod to drop down to
AREAS WHERE BODY MAY BE CRUSHED BY SUDDEN
WHILE SETTING STOP RODS AVOID
the leveling and stabilizing procedure is finished.
6. The jack stop rods should be adjusted immediately after
Latch the keeper wire for the retaining pin.
DROPPING OR SLIDING OF TRAILER.
trailer is supported by the front jacks.
the foot of the jack.
CAUTION:
STOP ROD
STOP ROD POSITION
RETAINING PIN
GUIDE
4. At this time, the operator may want to check the jacks
and place pads under the jacks if the ground will not support
the vehicle.
The LEVEL light will start to flash.
5. Press the "LEVEL" button a second time.
automatically shut off.
After the system has finished leveling and stabilizing, it will
vehicle and then extend any remaining jacks for stabilizing.
The system will automatically extend the jacks to level the

OPERATING PROCEDURES
MP34.2801
28FEB07
CAUTION: IMPORTANT: DO NOT interrupt power to the leveling
JACK RETRACTION
THE OPERATOR MUST BE SURE THAT
THERE ARE NO OBJECTS UNDER THE VEHICLE AND THAT
ALL PEOPLE ARE CLEAR OF THE VEHICLE. system while the "STORE" indicator light is blinking. DO NOT push the "OFF" button or turn power off to
7. If jacks cannot be retracted by the above procedure see
MANUAL JACK RETRACTION Section.
CAUTION: DO NOT MOVE THE VEHICLE WHILE THE
LEVELING JACKS ARE STILL IN CONTACT WITH THE GROUND
OR IN THE EXTEND POSITION. THIS VEHICLE IS EQUIPPED
WITH STRAIGHT ACTING JACKS. MOVING THE VEHICLE
WITH THE LEVELING JACKS EXTENDED CAN CAUSE
SEVERE DAMAGE TO THE JACKS AND OR THE VEHICLE AND
CREATE A DRIVING HAZARD. DO NOT RELY SOLELY UPON
WARNING LIGHTS. IT IS THE OPERATOR’S RESPONSIBILITY TO
CHECK THAT ALL JACKS ARE FULLY RETRACTED INTO
THE STORE/TRAVEL POSITION.
the system. The system must be allowed to
2. Push the "LEVEL" button. The LEVEL light will glow
4. Hitch the trailer to the tow vehicle according to the
manufacturers instructions. Use the existing landing
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.
JACK STOP ROD
RETAINING PIN
STOP ROD
gear or the front UP (EXTEND jacks) and DOWN
(RETRACT jacks) arrows.
remains on, the system will try to store the jacks for 20
minutes from the time the "STORE" button is pushed,
then turn off.
four red warning lights go out. If any red warning light
will automatically turn off 6 minutes after the last of the
the "STORE" button. All 4 jacks will retract. The panel
and the weight of the trailer is off of the front jacks, push
5. After the trailer is securely hitched to the tow vehicle,
OR SECURELY SUPPORTED BY THE EXISTING
IF THE TRAILER IS HITCHED TO A TOW VEHICLE
LANDING GEAR.
CAUTION:ONLY USE THE "STORE" BUTTON
completely finish the STORE mode.
625 SERIES LEVELING SYSTEM
steady.
3. Push the rear down arrow (RETRACT button) until
the weight of the vehicle is off the rear jacks.
6. The vehicle can be moved as soon as the red warning
lights are out, the jacks are in the STORE/TRAVEL position
and the green "TRAVEL MODE" light is on.
IMPORTANT: The "STORE" button will not function
until the weight of the vehicle is off the front jacks.

OPERATING PROCEDURES
MANUAL LEVELING
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.
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 enough
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-
warning lights will light when the jacks are extended
tional stability against wind and activity in the trailer. Jacks
NOTE: Refer to the trailer manufacturer instructions
IMPORTANT: Overheating and excessive current drain
15NOV07
MP34.3002
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.
7. The jack stop rods should be adjusted immediately after
the leveling and stabilizing procedure is finished.
RETAINING PIN
STOP ROD POSITION
STOP ROD
GUIDE
WHILE SETTING STOP RODS AVOID
AREAS WHERE BODY MAY BE CRUSHED BY SUDDEN
A. Remove retaining pin to allow stop rod to drop down to
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.
NOTE: The jack stop rods should be set anytime the
trailer is supported by the front jacks.
DROPPING OR SLIDING OF TRAILER.
Latch the keeper wire for the retaining pin.
CAUTION:
the foot of the jack.
2. The touch panel must be on for the system to function.
6. Push the "OFF" button on the touch panel to turn the
system off.

OPERATING PROCEDURES
MP34.3301
18DEC09
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.
The T-Handle
turn the
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.
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.
MANUAL JACK (With Stop Rod) RETRACTION
valve. Replace the protective plastic plug.
Turning the nut more could damage the
release nut more than
The 1/4" Valve
removed to gain access. Open valve 1-1/2 to 2 full turns.
release nut is located under a plastic plug that must be
turn the 1/4" valve
Large style with Valve Release Nut:
2 full turns.
DO NOT

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.

01MAR10
MP44.1500
± 1 inch side to side on a 36 foot vehicle. Typical leveling results will be better.
The sensing unit has an accuracy tolerance of ± 5.4 inches front to rear and
SENSING UNIT ACCURACY TOLERANCE
ADJUSTMENT SCREW
SENSING UNIT ADJUSTMENT
to the drawing below. The Sensing Unit is adjusted by turning
ADJUSTMENT
NUT (7/8" or 3/4")
while making the A-C adjustment.
adjustments first, then hold the adjustment nut from moving
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
MAY BE DIFFERENT
LED’S - LOCATION
BOX WALL
CONTROL
(OLD STYLE)
A
C
TOP VIEW - SENSING UNIT
D B
end wrenches of 7/8, 3/4, 1/2, 5/16 or 1/4 sizes will be needed.
needed. A Phillips screw driver or sockets w/driver or box
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
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
lights are on. Level the vehicle according to the yellow
"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
the vehicle, the front is still low. This means the front
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
SCREW (Phillips or 1/4")
ADJUSTMENT
SIDE VIEW - CONTROL BOX
NUT (5/16" OLD) - (1/2" NEW)
ADJUSTMENT
NUT (7/8" or 3/4")
(OLD STYLE)
ADJUSTMENT
properly.
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 (5/16" OLD) - (1/2" NEW)
SENSING UNIT MAINTENANCE/SERVICE
MI15.4550

LF RF
LR RR
FRONT
RIGHT
FRONT
LEFT
FRONT LEFT
REAR
RIGHT
REAR
EMERGENCY
VALVE RELEASE
PUMP/MANIFOLD
ASSEMBLY
MP65.301C
10OCT00
VIEW IS SHOWN WITH LEVELING
MANIFOLD ONLY, OTHER MANIFOLDS
MAY BE ATTACHED.
ROOM
EXTENSION
MANIFOLDS
NOTE:
NOTE: BEFORE OPERATING EMERGENCY
VALVE RELEASE, READ AND UNDERSTAND
PROCEDURE FOR EMERGENCY RETRACT
IN OPERATOR’S INSTRUCTIONS.
HYDRAULIC CONNECTION DIAGRAM
310 SERIES LEVELING SYSTEM WITH FRONT JACK EQUALIZATION
FIFTH WHEEL
MOTOR
PUMP

12 VOLT D.C.
HYDRAULIC
POWER UNIT
M
RELIEF VALVE
RETURN PRESSURE
SOLENOID MANIFOLD
ASSEMBLY
CHECK
VALVE
INNER
CHECK
VALVE
OUTER
SOL.VALVE
RF SOL.VALVE SOL.VALVE SOL.VALVE
LF RREQUALIZE
PRESSURE/RETURN
SHUTTLE VALVE 50 PSI
SWITCH
RIGHT
FRONT
LEFT
FRONT
MP65.327C
05APR0
0
HYDRAULIC SCHEMATIC
310 SERIES LEVELING SYSTEM
WITH FOUR STRAIGHT-ACTING JACKS
SOL.VALVE
LR
RIGHT REARLEFT REAR
JACK
CYLINDER

ELECTRICAL CONNECTION DIAGRAM
625 SERIES LEVELING SYSTEM
MP84.2251
10SEP09
TOUCH PANEL
BROWN
GRAY
12 PIN
4 PIN 12 PIN
BLACK
BLACK
8 PIN
GRAY
12 PIN
TOUCH PANEL - JACK WARNING LIGHTS AND PRESSURE SWITCHES
FIFTH WHEEL TRAILERS
LF RF
LR RR
AB B A
B A B A
6235
4000
4200 3200
6235
3000
6235
1000
1200 2200
6235
2000
WARNING
SWITCH
SWITCH
PRESSURE PRESSURE
SWITCH
WARNING
SWITCH
SWITCH
WARNING
SWITCH
PRESSURE
SWITCH
WARNING
PRESSURE
SWITCH
SEE 625 SERIES LEVELING
SYSTEM - LEVELING
MANIFOLD - PUMP
AND MASTER RELAYS
6230 -
TO HWH
GROUND
STUD 6800
TOUCH
PANEL
HARNESS
SEE 625 SERIES LEVELING
AND MASTER RELAYS
MANIFOLD - PUMP
SYSTEM - LEVELING
CAUTION!
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
HWH COMPUTERIZED LEVELING
R
ON
OFF
AUTO
STORE
MODE
TRAVEL
PARK/
BRAKE
NOT IN
SLOPE
EXCESS
TO BATTERY
6100

ELECTRICAL CONNECTION DIAGRAM
MP84.2301
10SEP09
625 OR 625S SERIES LEVELING SYSTEMS
TOUCH PANEL CONNECTIONS
LINK LIGHT
GROUND FROM CONTROL BOX
CAN SHIELD
CAN LOW
CAN HIGH
YELLOW
GREEN
WIRE
COLOR
4
3
2
1
WHITE
PIN # NUMBER
6230
WIRE WIRE DESCRIPTION AND FUNCTION
PIN 1
SWITCHED BATTERY FROM CONTROL BOX
6800RED
5
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
HWH COMPUTERIZED LEVELING
TRAVEL
CAUTION!
OFF
STORE
MODE
BRAKE
PARK/
NOT IN
EXCESS
AUTO
ON SLOPE

ELECTRICAL CONNECTION DIAGRAM
CONTROL BOX CONNECTION INFORMATION
SWITCHED GROUND FROM RIGHT FRONT WARNING SWITCH
SWITCHED GROUND FROM LEFT FRONT WARNING SWITCH
12 PIN GRAY CONNECTOR
BLACK
BLACK
COLOR
WIRE
GRAY CONNECTOR
4
3
PIN # NUMBER
2000
1000
WIRE WIRE DESCRIPTION AND FUNCTION
SWITCHED GROUND FROM LEFT FRONT PRESSURE SWITCH
BLACK 12005 SWITCHED GROUND FROM RIGHT FRONT PRESSURE SWITCH
BLACK 22006 SWITCHED GROUND FROM RIGHT REAR PRESSURE SWITCH
BLACK 32007
8BLACK 30009 SWITCHED GROUND FROM LEFT REAR WARNING SWITCH
BLACK 400010 NO CONNECTION
11
SWITCHED GROUND FROM RIGHT REAR WARNING SWITCH
625 SERIES LEVELING SYSTEM - FIFTH WHEEL TRAILERS
SHARED GROUND FOR WARNING SWITCHES
6235WHITE12
MASTER RELAY CONTROL - SWITCHED +12V
3000 LB PRESSURE SWITCH - SWITCHED GROUND AT 3000# + PRESS.
50 LB PRESSURE SWITCH - SWITCHED GROUND AT 50# + PRESS.
NO CONNECTION
SWITCHED +12 FOR LEFT FRONT SOLENOID VALVE
NO CONNECTION
SWITCHED +12 FOR EQUALIZE SOLENOID VALVE
SWITCHED +12 FOR LEFT REAR SOLENOID VALVE
SWITCHED +12 FOR RIGHT REAR SOLENOID VALVE
SWITCHED +12 FOR RIGHT FRONT SOLENOID VALVE
NO CONNECTION
PUMP RELAY CONTROL - SWITCHED +12V
12 PIN BROWN CONNECTOR
6
BLACK
BLACK
BLACK
BLACK
12
9
7
8
11
10
8600
1410
3400
2400
BLACK
BLACK
BLACK
BROWN CONNECTOR
1
4
2
3
5
8100
8101
1400
BLACK 4400
CAN LOW
BATTERY
CAN SHIELD
GROUND
SWITCHED BATTERY
NO CONNECTION
8 PIN BLACK CONNECTOR
GREEN
WHITE
RED
BLACK CONNECTOR
5
7
4
3
1 AND 2
6230
6800
GRAY CONNECTOR 4 PIN GRAY CONNECTOR
+12V BATTERY POWER FROM PUMP RELAY
+12V BATTERY POWER FROM PUMP RELAY
GROUND FROM HWH GROUND STUD
GROUND FROM HWH GROUND STUD
WHITE
WHITE
RED
RED
2
3
4
16800
6230
6230
6800
12 PIN
GRAY
4 PIN
GRAY
BLACK
8 PIN
BLACK
12 PIN
BROWN
12 PIN
12 PIN BLACK CONNECTORBLACK CONNECTOR
BLACK 8500
NO CONNECTION
1 THRU 12
6 RED 6100
YELLOW8 CAN HIGH
NO CONNECTION
1 AND 2
BLACK 4200 SWITCHED GROUND FROM LEFT REAR PRESSURE SWITCH
MP84.2352
10SEP09
PIN 1
PIN 12
PIN 4
PIN 1
PIN 12
PIN 1
PIN 1
PIN 8
PIN 12
PIN 1

ELECTRICAL CONNECTION DIAGRAM
625 SERIES LEVELING SYSTEM - FIFTH WHEEL TRAILERS
CONTROL BOX - LED - FUSE LOCATION AND DESCRIPTION
RELAY DESCRIPTIONLED FUSE
1-YELLOW
2-RED
3-YELLOW
4-RED
5-YELLOW
6-RED
7-YELLOW
8-RED
11-YELLOW
RIGHT REAR COIL
12-RED
F1 - 15 AMP
F2 - 15 AMP
F3 - 15 AMP
F4 - 15 AMP
F6 - 5 AMP
NOTE: FOR DETAILED INPUT / OUTPUT INFORMATION ABOUT
PIN CONNECTIONS SEE ELECTRICAL CONNECTION
DIAGRAM - CONTROL BOX CONNECTION INFORMATION.
IF A YELLOW LED IS LIT AND THE
IF A YELLOW LED IS NOT LIT, THERE IS A PROBLEM WITH
VOLTAGE IN THE 4-PIN CONNECTOR.
IS COMING ON THERE MAY BE PROBLEM WITH INPUT
IF THE YELLOW LED’S ARE WORKING BUT NO RED LED
IT’S FUSE IS BLOWN OR THE RELAY IS BAD.
CORRESPONDING RED LED IS OFF, EITHER
VOLTAGE ON IT’S CORRESPONDING OUTPUT PIN.
A LIT RED LED INDICATES THERE IS
SIGNAL TO TURN THE CORRESPONDING RELAY ON.
NOTE: A LIT YELLOW LED INDICATES THERE IS A GROUND
13-YELLOW
14-RED F7 - 5 AMP
THE CONTROL BOX, TOUCH PANEL OR CONNECTION CABLE.
15-YELLOW
16-RED
19-YELLOW
40-RED
21-YELLOW
22-YELLOW
23-YELLOW
24-YELLOW
25-RED
26-RED
27-RED
28-RED
29-RED
30-YELLOW
31-GREEN
32-RED
33-GREEN
34-RED
35-RED
36-RED
37-RED
38-RED
39-RED
RIGHT REAR OUTPUT
LEFT REAR COIL
LEFT REAR OUTPUT
RIGHT FRONT COIL
RIGHT FRONT OUTPUT
LEFT FRONT COIL
LEFT FRONT OUTPUT
DUMP COIL
DUMP OUTPUT
MASTER RELAY COIL
MASTER RELAY OUTPUT
PUMP COIL
PUMP OUTPUT
EQUALIZE VALVE COIL
EQUALIZE VALVE OUTPUT
LEFT FRONT WARN SW
RIGHT FRONT WARN SW
RIGHT REAR WARN SW
LEFT REAR WARN SW
LEFT FRONT PRESS SW
RIGHT FRONT PRESS SW
RIGHT REAR PRESS SW
LEFT REAR PRESS SW
NOT USED
NOT USED
3000 LB PRESS SW INPUT
MASTER WARN CONTROL
50 LB PRESS SW INPUT
JACK INTERRUPT
PARK BRAKE
BOARD ENABLE
+12 BATTERY IN
+12 BATTERY OUT FOR
LINK LIGHT
F8 - 5 AMP
F10 - 10 AMP
F11 - 3 AMP
MASTER WARNING
MP84.2404
10SEP09
LEFT SIDE
RIGHT SIDE
GROUND
FRONT
REAR
+12V
39
F12
36 3837
SENSING UNIT
LED
FUSE
DUMP
11
12
2
1
REAR RIGHT LEFT
4
3
F1
REAR
F2
32
27
28
25
26
24
22
23
21 29 3130
16
15
RELAY RELAY MASTER
F6
13
14
F7
PUMP
F8
F10
33 34 35
F4
RIGHT FRONT
6
5
LEFT FRONT F3
8
7
VALVE EQUAL
40
19
F13
NOTE: DUMP ONLY USED
FOR VEHICLES WITH AN
AIR SUSPENSION
F11
F13 - 15 AMP
+12 BATTERY OUT FOR
TOUCH PANEL F12 - 10 AMP

MP84.2454
10SEP09
PUMP MASTER
LEVELING MANIFOLD
PUMP AND MASTER RELAYS
625 SERIES LEVELING SYSTEM - FIFTH WHEEL TRAILERS
ELECTRICAL CONNECTION DIAGRAM
4 PIN
GRAY 8 PIN
BLACK
12 PIN
BROWN
BA
6240
1400
4401 6231
6240
3400
6241
4400
P.E.D
RELAY RELAY
TO HOUSE
BATTERY
MOTOR
TO PUMP
GROUND STUD
6231 - TO HWH
6800
6230 - TO HWH
GROUND STUD
TOUCH PANEL
HARNESS
8500
HWH GROUND STUD
A
B
P.E.D
BAA
B
P.E.D P.E.D
6241
BA
P.E.D
2400
RIGHT REAR
SOLENOID VALVE
LEFT REAR
SOLENOID VALVE
LEFT FRONT
SOLENOID VALVE
EQUALIZE
SOLENOID VALVE
RIGHT FRONT
SOLENOID VALVE
6241
6240
6231
TO MASTER & PUMP RELAYS
TO 3000LB PRESSURE SWITCH - 8100
TO 50LB PRESSURE SWITCH - 8101
EQUALIZE VALVE
RF VALVE
LF VALVE
LR VALVE
RR VALVE
8600
SHUTTLE VALVE
SEE VIEW A-A
PUMP ASSEMBLY - SIDE VIEW
VIEW A-A RR LR
LF
EQ
RF

ML60078/MP84.999
9
16APR1
9
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
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.
WIRE TIE
WIRE TIE
HYDRAULIC SOLENOID VALVE
INFORMATION/INSTRUCTION SHEET
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 WILL HAVE A VALVE 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
VALVE
NUT
RELEASE
VALVE
open the valve. Do not over tighten
when closing.
approximately 4 1/2 turns to fully
compresses a spring. It takes
turn easy at first, then harder as it
open the valve. T-handle should
Turn T-handle counterclockwise to
BREATHER CAP W/NUT DRIVER
SOLENOID VALVES WITH T-HANDLE RELEASE
NOTE: OLD STYLE HEX SHAPED
SOLENOID VALVES HAVE NO MANUAL
VALVE RELEASE.
2 1/4" DIAMETER SOLENOID VALVE