HWH 725 SERIES User manual

OPERATOR’S MANUAL
ML47732/MP04.3375
16NOV10
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
R
Kick-Down Jacks
HWH COMPUTERIZED LEVELING
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
WARNING
SLOPE
AUTO
STORE
OFF
TRAVEL
NOT IN
PARK/
BRAKE
ON EXCESS
MODE
HWH COMPUTER-CONTROLLED
725 SERIES LEVELING SYSTEM
R
AP47666
CORPORATION
W
HH
R

OPERATOR’S MANUAL
MP14.0017
16NOV10
WARNING !
READ THE ENTIRE OPERATOR’S MANUAL BEFORE OPERATING.
BLOCK FRAME AND TIRES SECURELY BEFORE CRAWLING UNDER VEHICLE. DO NOT USE LEVELING JACKS
OR AIR SUSPENSION TO SUPPORT VEHICLE WHILE UNDER VEHICLE OR CHANGING TIRES. VEHICLE MAY
DROP AND OR MOVE FORWARD OR BACKWARD WITHOUT WARNING CAUSING INJURY OR DEATH.
KEEP ALL PEOPLE CLEAR OF THE VEHICLE WHILE LEVELING SYSTEM AND ROOM EXTENSIONS ARE
BEING OPERATED.
KICK-DOWN JACKS MAY ABRUPTLY SWING UP WHEN THE FOOT OF THE JACK CLEARS THE GROUND
OR WHEN THE JACK REACHES FULL EXTENSION.
NEVER PLACE HANDS OR OTHER PARTS OF THE BODY NEAR HYDRAULIC LEAKS. OIL MAY PENETRATE
THE SKIN CAUSING INJURY OR DEATH.
WEAR SAFETY GLASSES WHEN INSPECTING OR SERVICING THE SYSTEM TO PROTECT EYES FROM DIRT,
METAL CHIPS, OIL LEAKS, ETC. FOLLOW ALL OTHER APPLICABLE SHOP SAFETY PRACTICES.
IF THE VEHICLE IS EQUIPPED WITH KICK-DOWN STYLE JACKS, DO NOT OVER EXTEND THE REAR JACKS.
IF THE WEIGHT OF THE VEHICLE IS REMOVED FROM ONE OR BOTH REAR WHEELS, THE VEHICLE MAY
ROLL FORWARD OR BACKWARD OFF OF THE JACKS.
IMPORTANT: IF VEHICLE IS EQUIPPED WITH A ROOM EXTENSION, READ ROOM EXTENSION SECTION
BEFORE OPERATING LEVELING SYSTEM.
HOW TO OBTAIN WARRANTY SERVICE
THIS IS NOT TO BE INTERPRETED AS A STATEMENT OF WARRANTY
HWH CORPORATION strives to maintain the highest level of
customer satisfaction. Therefore, if you discover a defect or
problem, please do the following:
[phone] OR [phone]. Give your name and
coach was purchased, or the date of system installation,
Notify the dealership where you purchased the
vehicle or had the leveling system installed. Dealership
management people are in the best position to resolve
the problem quickly. If the dealer has difficulty solving
the problem, he should immediately contact the Customer
Service Department, at HWH CORPORATION.
If your dealer cannot or will not solve the problem,
notify the Customer Service Department:
HWH CORPORATION 2096 Moscow Rd. Moscow IA. 52760
address, coach manufacturer and model year, date the
SECOND:
FIRST:
authorization of an independent service facility, to be
defective part, either by appointment at the factory or by the
CORPORATION will authorize repair or replacement of the
determine whether or not your claim is valid. If it is, HWH
HWH CORPORATION personnel will contact you to
during business hours (8:00 a.m. till 5:00 p.m. c.s.t.).
description of the problem, and where you can be reached
determined by HWH CORPORATION. All warranty repairs
must be performed by an independent service facility
authorized by HWH CORPORATION, or at the
HWH CORPORATION factory, unless prior written approval
has been obtained from proper HWH CORPORATION
personnel.

CONTROL IDENTIFICATION
MP24.3153
01DEC10
operation.
automatic operation button. The on indicator light is
the jacks.
leveling system cannot level the vehicle.
CONTROL FUNCTIONS
CONTROLS
"OFF" BUTTON:
"ON/AUTO" (I) BUTTON:
"STORE" BUTTON:
UP (RAISE) AND DOWN (LOWER) ARROWS:
"EXCESS SLOPE" LIGHT:
"NOT IN PARK/BRAKE" LIGHT:
"TRAVEL MODE" LIGHT:
MASTER "JACKS DOWN" WARNING LIGHT:
the jacks in pairs, right side, left side, front and rear. Pushing
"STORE" button. This button is used to automatically retract
buttons are for manually controlling jacks. They will operate WARNING LIGHTS:
This is the on button and
The store indicator light is above the
These
UP arrows will cause the jacks to extend and raise the vehicle.
DOWN arrows will cause the jacks to retract.
This indicator will light when
the panel is on and the hand/auto brake is not set.
INDICATOR LIGHTS
LEVELING LIGHTS:
This indicator light will be on
when the ignition is on, when the jacks are retracted and
there are no red WARNING lights on.
sensing indicators. When a yellow light is on, it indicates that
its side or end of the vehicle is low. No more than two lights
STORE LIGHT:
should be on at the same time.
The four red lights surround the yellow
level indicators are jack WARNING lights. They are functional
only when the ignition is in the "ON" or "ACC" position, the
system is on, and the jacks are in the vertical position.
This indicator will light when the
The four yellow indicating lights are level
This is a light
mounted in the dash separate from the touch panel. It will be
on when any one or more jacks are vertical and the ignition is "ON".
This light will flash when the system is in the
STORE mode.
Push the "OFF" button to stop hydraulic
WARNING
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
HWH COMPUTERIZED LEVELING
ON
STORE
AUTO
OFF MODE
TRAVEL
EXCESS
BRAKE
PARK/
NOT IN
SLOPE
LOWER FRONT
Manual Button
RAISE FRONT
Manual Button
JACK DOWN
Indicator lights (4) red
RAISE RIGHT SIDE
Manual Button
LOWER RIGHT SIDE
Manual Button
Indicator lights (4) yellow
LEVEL SENSING
RAISE REAR
Manual Button
Manual Button
LOWER REAR
LOWER LEFT SIDE
Manual Button
RAISE LEFT SIDE
Manual Button
Indicator light
"EXCESS SLOPE"
Indicator light
"ON/AUTO" LEVEL
"ON/AUTO" (I) Button
STORE Indicator light
"STORE" Button
Indicator light
"NOT IN PARK/BRAKE"
"TRAVEL MODE"
Indicator light
"OFF" Button
above the "I" button.
"ON/AUTO" LEVEL LIGHT: This light is on when the
system is on and flashes when the system is operating.

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
MP34.0234
30NOV10
GENERAL INSTRUCTIONS
PREPARATION FOR TRAVEL
If parking on soft ground or asphalt paving, a wood block or
pad should be placed under each jack.
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.
If the hand / auto brake is not set when the "ON/AUTO" (I)
button is pressed, the "NOT IN PARK/BRAKE" light will
come on. When the "ON/AUTO" (I) button is released the
IMPORTANT: 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.
POSITION BEFORE TRAVELING.
FULLY RETRACTED INTO THE STORE/TRAVEL
RESPONSIBILITY TO CHECK THAT ALL JACKS ARE
WARNING LIGHTS. IT IS THE OPERATOR’S
DO NOT RELY SOLELY UPONWARNING:
ROOM EXTENSION PROCEDURES
MUST be blocked securely. It is recommended that the
If the vehicle is equipped with kick-down jacks, the wheels
extension read this section carefully.
IMPORTANT: If the vehicle is equipped with a room
when the vehicle is supported by the leveling system.
Refer to the vehicle owners manual for proper operation of
IMPORTANT: Do not use a room extension support
room extensions.
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.
"NOT IN PARK/BRAKE" light will go out. The panel will
Any time the "ON/AUTO" (I) button has been pushed,
push the "STORE" button before traveling.
vehicle is leveled and stabilized before any rooms are
extended. It is recommended all rooms are retracted
before the leveling system is retracted. It is recommended
the leveling system is not operated when any room extension
is extended.
NOT turn on.

MP34.2755
30NOV10
AUTOMATIC HYDRAULIC LEVELING
WARNING:
IMPORTANT: DO NOT interrupt power to the leveling
1. Place transmission in the recommended position for
parking vehicle and set parking brake. Turn the coach
engine off. Turn the ignition to the "ACCESSORY" position.
2. Press the "ON/AUTO" (I) button to enter the hydraulic
operation mode. The ON light will glow steady.
The system will automatically extend the jacks to level the
vehicle and then extend any remaining jacks for stabilizing.
After the system has finished leveling and stabilizing, it will
automatically shut off.
5. Turn the ignition switch to the "OFF" position.
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 the ignition key.
4. If jacks cannot be retracted by the above procedure see
MANUAL JACK RETRACTION Section.
WARNING: DO NOT RELY SOLELY UPON
WARNING LIGHTS. IT IS THE OPERATOR’S
RESPONSIBILITY TO CHECK THAT ALL JACKS
The system must be allowed to completely finish the
2. Press the "STORE" button. The store indicator light will
flash. As each jack retracts, its red WARNING light will go
out. The system will automatically shut down six minutes after
the four individual red WARNING lights are out. If any one
red WARNING light does not go out, the system will continue
to store for thirty minutes, then shut down regardless of the
"WARNING" lights condition.
3. 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" light is on.
ARE FULLY RETRACTED INTO THE STORE/TRAVEL
POSITION BEFORE TRAVELING. 1. Start the engine. Store the jacks immediately.
OPERATING PROCEDURES
625\725 SERIES LEVELING SYSTEM
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 extending 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 not be extended. The system will shut off
leaving the "EXCESS SLOPE" light on. The "EXCESS
SLOPE" light will remain on if the ignition is in the "ON" or
"ACC" position, until the jacks have been fully retracted
turning the red warning lights out. Push the "STORE" button
to retract the jacks. Move the vehicle to a more level position
or level the vehicle as close as possible according to the
MANUAL HYDRAULIC OPERATION section.
NOTE: When traveling thermal expansion may cause
a jack to extend slightly. When the "STORE" button
has been used to retract the jacks, the system will
automatically retract any jack that extends due to
thermal expansion.
STORE mode.
IMPORTANT: If a red warning light and buzzer come on
while traveling, the jacks should be checked as soon as
a safe parking location is found.
3. Press the "ON/AUTO" (I) button a second time. The
ON/AUTO indicator light will start to flash. One at a time the
jacks will swing to the vertical position. The red WARNING
light for each jack will come on as it’s respective jack becomes
vertical. At this time, the operator may want to check the
jacks and place a pad under each jack if the ground will
not support the vehicle.
4. Press the "ON/AUTO" (I) button a third time.
The ON/AUTO lightwill start to flash.
JACK POSITIONS
STORE/TRAVEL POSITION
EXTEND POSITION

OPERATING PROCEDURES
MP34.3336
30NOV10
WARNING:
IMPORTANT: Do not continue to push a RAISE
MANUAL JACK RETRACTION
MANUAL HYDRAULIC OPERATION
1. Place transmission in the recommended position for parking
2. Press the "ON/AUTO" (I) button.
3. Press the "ON/AUTO" (I) button a second time. The
ON/AUTO indicator light will start to flash. One at a time,
4. The vehicle may be leveled using the manual RAISE
(UP ARROW) buttons on the right half of the panel. If a yellow
LEVEL SENSING light is on, that side, end or corner of the
Jacks will extend (or retract) in pairs to raise (or lower) a side
or end of the vehicle. Any jack not used for leveling can be
extended to the ground. This provides additional stability
(UP ARROW) button for more than ten (10) seconds
5. When leveling is completed, push the "OFF" button on the
touch panel and turn the ignition switch to the "OFF" position.
KEEP AWAY FROM THE WHEELS,
DO NOT CRAWL UNDER THE VEHICLE, KEEP A SAFE
DISTANCE IN FRONT AND REAR OF VEHICLE. THE
VEHICLE MAY DROP AND/OR MOVE FORWARD OR
BACKWARD WITHOUT WARNING AS THE VALVE
NOTE: Use the valve release nuts for retracting only if
the "STORE" button on the control panel will not
retract the jacks for travel.
1. Locate the 4 valve release nuts on the solenoid valves
The solenoid valves are located on the pump/valve assembly
2. Allow clearance for vehicle to lower.
4. Retract the rear jacks by opening the two outer valves.
Slowly turn the release nuts counter clockwise. The nuts
may turn easily at first but as an internal spring is compressed,
turning may become more difficult. The valves need only
to be opened enough to retract the jack.
5. Retract the front jacks by opening the two center valves
as described in Step 3.
6. Check that all four jacks are now retracted.
7. Close the valves by turning the nuts clockwise.
Once the internal spring tension has been released, the
release nuts will turn free for several turns. Once the
release nuts are snug, DO NOT tighten the nuts past this
point as internal damage may occur to the solenoid.
9. The system should now be repaired before using again.
against wind and activity in the vehicle.
the vehicle, and set the parking brake. Turn the ignition to the
"ACCESSORY" position.
See the "HYDRAULIC LINE CONNECTION DIAGRAM
after that pair of jacks are fully extended.
RELEASE IS OPERATED.
LEVELING SYSTEM." 10. Push the "STORE" button before traveling.
The ON/AUTO indicator light will glow steady.
the jacks will swing to the vertical position. The four red
WARNING lights will be on. Place a pad under each jack
foot if the ground will not support the vehicle on the jacks.
Put out any side yellow light before leveling
the vehicle from front to rear.
3. Use the 1/4" nut driver in the end of the breather cap.
Clean around the cap before removing and cover the hole
after removing the cap.
8. Replace the breather cap.
vehicle is low.
LARGE STYLE WITH
VALVE RELEASE NUT
MANIFOLD
PLASTIC PLUG
RELEASE NUT
WITH VALVE
SMALL STYLE
BREATHER
CAP
(A deeper 1/4" socket may be needed for the large valves.)
IMPORTANT: THE VALVE RELEASE NUT FOR THE
SMALL VALVE SHOULD NOT BE TURNED MORE
THAN 4 & 1/2 TURNS.
THE VALVE RELEASE NUT FOR THE LARGE VALVE
SHOULD NOT BE TURNED MORE THAN 2 FULL TURNS.
(remove to access the
1/4" release nut)

MAINTENANCE
MP44.0021
30NOV10
OIL LEVEL
The oil level should be checked when the vehicle is first
purchased and then once every two years. More often if
there is an oil leak in the system.
NOTE: Overfilling the tank can cause leakage of oil
through the breather cap.
ELECTRICAL SYSTEM
The batteries should be in good condition and fully charged.
Weak batteries can cause erratic operation. Battery cable
terminals and battery posts and connections should be kept
All electrical connections, especially ground connections,
should be clean, tight, free from corrosion and protected
LEVELING JACKS
There are very few user serviceable parts on the leveling
jacks. The jacks require very little maintenance. If the jacks
VISUAL INSPECTION
Periodically inspect the leveling system for oil leaks and
damaged or missing parts, such as pivot bolts or springs.
Check the hydraulic lines and wiring for damage and wear.
Check that the jacks do not interfere with any parts of the
vehicle when they are in the "STORE" position.
The system will operate better if kept clean and free
from caked on mud or ice.
OPERATIONAL CHECK
Check that all lights work according to the "INDICATOR
LIGHT" Section. Correct function of the red "WARNING"
Review the OPERATOR MANUAL. Run the system
according to the SYSTEM OPERATION (LEVELING) Section.
Note any abnormal operation.
Review the "JACK RETRACTION" Section. Make sure the
jacks will fully retract to the "STORE" position. Jacks should
not interfere with any of the coach when in the "STORE"
All maintenance should be done as part of the normal
servicing of the coach.
clean. from weathering.
light is important.
position.
FLUID: HWH Specialty Hydraulic Oil is recommended. In an
brake fluid or hydraulic jack fluid. Use of these can damage
and can cause staining should a leak occur. DO NOT USE
Dexron automatic transmission fluid contains red dye
emergency Dexron automatic transmission fluid can be used.
seals.
NOTE:
are extremely dirty with caked on mud they should be washed.
The jack rods do not need to be oiled or sprayed with
anything. See maintenance, SYSTEM ADJUSTMENT.
All four jacks should be completely retracted before checking
the oil level. The oil reservoir is part of the pump/manifold
assembly. The oil level is checked and filled through the
breather cap. Clear any dirt away from the breather/filler cap
before removing. The oil level should be within one inch of
the top of the reservoir. Most breather caps have a dipstick.

There are two basic adjustments which are made at the time
of installation. However, when adjustment of a leveling unit
is needed, the following procedures are recommended.
Always make vertical adjustment first. If
the vertical adjustment is changed at anytime, be sure to check
the horizontal adjustment. Vertical position is changed by adjusting
Horizontal stop is adjusted by turning the set screws located
just inside the cable locknuts. The jack can be adjusted down
to provide clearance for objects which may interfere with the
operation of the jacks. The horizontal stop must be adjusted
to provide clearance between the hat bracket and mounting
bolts; and the actuator and hose fittings, when the jack is in
the STORE POSITION. The jack must be able to fully extend
in the horizontal position without interfering with suspension com-
Each jack should be checked to be sure
that it is vertical when it swings down. To do this, retract all
jacks, then extend each jack until it is close to, but not touching
the ground. If the jack stopped short of being vertical, it can
be adjusted by loosening the lower adjusting nut and tightening
the upper nut.
The horizontal stop can be adjusted up or down in the slot to
provide clearance for objects which may interfere with operation
MP44.0503
17NOV10
MAINTENANCE
SYSTEM ADJUSTMENT
JACK ADJUSTMENT
ADJUSTING
UPPER
STANDARD &
LOW PROFILE
UNITS
9,000 lb. JACKS
ADJUSTING
LOWER
NUT NUT
STOP
ADJUSTMENT
VERTICAL
ADJUSTMENT
6,000 lb. JACKS
ponents, tanks, etc.
NOTE: The two front jacks should be adjusted to the
same horizontal position.
1. 6,000 lb. JACKS:
2. 9,000 lb. JACKS:
the lock nuts on the actuator cable. If the jack stopped short
of vertical, tighten the lock nuts. If the jack goes past vertical,
back the lock nuts off. Be sure to adjust each nut the same
number of turns.
of the jack. The stop must be adjusted so that the jack can be
fully extended in the horizontal position without interfering with
suspension components, tanks, etc.
NOT IN PARK/BRAKE CHECK
Set the park/brake. Switch the ignition to the "ACC" or "ON"
position. Push the "ON/OFF" switch toward "ON". Release
the parking brake and confirm that the "PARK" indicator light
comes on. Reset the parking brake. The "PARK" indicator
light should go out. Switch the ignition to "OFF".
THE COACH WHEELS SECURELY SO THE COACH
CANNOT ROLL FORWARD OR BACKWARD.
WARNING: WHEN MAKING THIS CHECK, BLOCK If any of the above checks or inspections reveal a
problem or if there are other problems or questions,
consult a qualified RV repair center, your vehicle or
coach manufacturer, or HWH CORPORATION for
The only maintenance is to keep the jacks clean by washing
and oiling the pivot points several times a year when doing
general maintenance on the vehicle.
The 9000# jack has a roller bearing on the opposite side
from the stop. It needs to roll freely. Oiling the roller bearing
whenever general vehicle maintenance is done is a good
idea. Also oil the pivot point at the same time. The only
other maintenance to the jack is to keep it clean by washing.
PIVOT
POINT
POINT
PIVOT
service or repair.
LOCK NUTS,
ADJUSTING
HORIZONTAL
SET SCREW,

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