HWH 2000 SERIES User manual

OPERATOR’S MANUAL
ML47805/MP04.4100
06DEC10
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
2000 SERIES PRECISION LEVELING SYSTEM
HWH COMPUTER-CONTROLLED
R
FOR TRAILERS
W
CORPORATION
HH
R
FEATURING:
Four Straight-Acting Power Extend/Power Retract Jacks
Touch Panel Leveling Control
AP47804
STOP
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
WARNING!
TRAVEL
MODE LEFT
REAR REAR
RIGHT
STORE
LEVEL
AUTO
AUTO
MANUAL
HWH PRECISION LEVELING
INCORRECT
PROCEDURE
MANUAL
DUMP
SLOPE
EXCESS FRONT
R
LEFT FRONT
RIGHT

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.

MP24.3426
22AUG11
"STOP" BUTTON:
automatic hydraulic operation.
"AUTO LEVEL" ( ) BUTTON:
"AUTO STORE" BUTTON:
above the "AUTO STORE" button. This button is used
to automatically retract the jacks.
JACK DOWN LIGHTS:
CONTROL FUNCTIONS
INDICATOR LIGHTSAUTO CONTROL BUTTONS
Push the "STOP" button to stop
The store indicator light is
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.
The front and rear lights should not be on at the same time.
This is the on button and
The four red lights surrounding
the yellow level indicators are jacks down WARNING
lights. They are functional when the Master Power
automatic operation button.
CONTROL IDENTIFICATION
2000 SERIES PRECISION LEVELING SYSTEM
COMPUTER-CONTROL
switch is on. When a jack is extended approximatelyAUTO LEVEL INDICATOR LIGHT: (RED) This light
indicates that the panel is active in the auto level or
AUTO STORE LIGHT: (RED) This light indicates that
the system is in STORE mode.
SEE MANUAL LEVELING PROCEDURE.
"EXCESS SLOPE" Indicator light
"TRAVEL MODE" Indicator light
"STOP" button
"AUTO STORE" Button
STORE Indicator light
"AUTO LEVEL" Button
AUTO LEVEL Indicator light
JACK DOWN Indicator light (4) red
LEVEL SENSING Indicator light
RETRACT RF JACK Manual button
EXTEND RF JACK Manual button
EXTEND LF JACK Manual button
(4) yellow
1 inch, it’s warning light will come on.
EXTEND RR JACK Manual button
RETRACT RR JACK Manual button
RETRACT LR JACK Manual button
RETRACT LF JACK Manual button
EXTEND LR JACK Manual button
MANUAL CONTROL BUTTONS
when the leveling system cannot level the vehicle.
(RED) This indicator will light"EXCESS SLOPE" LIGHT:
(GREEN) This LED, indicates
the leveling system is in the travel mode. All jack down
"TRAVEL MODE" LIGHT:
INCORRECT PROCEDURE
Indicator light
INDICATOR LIGHTS
maintain mode.
"INCORRECT PROCEDURE" LIGHT: (RED) This light
flashes if certain specific procedures are not followed.
warning lights should be off.
Because of the level sensor arrangement, both side lights
can be on at the same time.
STOP
UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES
SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
WARNING!
TRAVEL
MODE LEFT
REAR REAR
RIGHT
STORE
LEVEL
AUTO
AUTO
MANUAL
HWH PRECISION LEVELING
INCORRECT
PROCEDURE
MANUAL
DUMP
SLOPE
EXCESS FRONT
R
LEFT FRONT
RIGHT
"MANUAL DUMP" Button
"MANUAL DUMP" BUTTON: Not used
See "INCORRECT PROCEDURE LIGHT" page.

OPERATING PROCEDURES
MP34.0280
06DEC10
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 "STOP" 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, if so equipped, 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 WHILE
WARNING:
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 of
room extensions.
on for the leveling system to operate. Refer to the vehicle
The HWH or OEM supplied master power switch must be
NOTE: This vehicle may be equipped with equipment
interfaces that prevent operation of the leveling system.
Refer to the vehicle manufacturer for information
concerning equipment interfaces.
manufacturer for information about a master power switch.

OPERATING PROCEDURES
MP34.0380
09MAY13
INCORRECT PROCEDURE LIGHT
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
both front jacks are 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 both front jacks are firmly on
the ground and both front warning lights are on steady.
3. The "AUTO STORE" button will not function if either front
jack is supporting any of the trailer weight.
lights will go out. The front warning lights will remain on if
the jacks are extended.
All of the Touch Panel manual buttons will continue to
function while the "INCORRECT PROCEDURE" light is
on, but the "AUTO LEVEL" or "AUTO STORE" buttons
will function only when the situation is corrected.
GO - NO GO INDICATOR LIGHTS
Refer to the vehicle manufacturer for mounting location of the GO - NO GO indicator lights.
GREEN LIGHT -Indicates the vehicle is level within the tolerance of the level sensing units.
Indicates the vehicle is out of level according to the tolerance of the levelingRED LIGHT -
system level sensing units. The vehicle should be re-leveled before vehicle equipment is used.
RED
GREEN
TWO SWITCH REMOTE PANEL
RF
WARNING!
CORPORATION
W
HH
R
UNDERSTAND OPERATOR’S MANUAL
BEFORE USING. BLOCK FRAME AND
TIRES SECURELY BEFORE REMOVING
TIRES OR CRAWLING UNDER VEHICLE.
RETRACT
LF EXTEND
IMPORTANT: REFER TO THE VEHICLE MANUFACTURER FOR HITCHING AND
UNHITCHING PROCEDURES. The master power switch for the leveling system must
be on to use the remote switch panel.
To extend or retract the front jacks, push and hold the switches to "EXTEND"
or "RETRACT". If desired, both switches can be pushed at the same time.
It is not recommended to lift the trailer with one front jack.
Refer to the vehicle manufacturer for mounting location of the TWO SWITCH REMOTE
PANEL. This panel will operate the two front jacks only. This panel can be used to hitch
or unhitch the trailer from the tow vehicle.
PUMP RUN TIME
This system monitors the amount of time the pump is running
during auto leveling, auto store or manual operations. The
timer counts up when the pump is on and down when the
pump is off. When a total of 15 minutes pump on time is
reached, the system will shut off and turn the
"EXCESS SLOPE" light on.
system is cycled off and back on with the master power switch.
No automatic function will operate until power to the leveling
The manual UP and DOWN ARROWS will function with the
"EXCESS SLOPE" light on.
IMPORTANT: IF THE "EXCESS SLOPE" LIGHT IS ON
BECAUSE OF EXCESSIVE PUMP ON TIME, THE PUMP
SHOULD BE ALLOWED TO COOL FOR 30 MINUTES
BEFORE CONTINUING OPERATIONS.

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
09MAY13
MP34.2780
extend the HWH front jacks to the ground and retract the
auxiliary jacks before the leveling system is used for leveling.
the vehicle and then extend any remaining jacks for stabilizing.
The system will first automatically extend the jacks to level
1. Turn the master power switch on.
2. Use the front UP arrow manual buttons to extend the
front jacks to unhitch the trailer. - OR - The trailer may be
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. After the system has finished leveling and stabilizing,
it will begin the precision leveling sequence. The precision
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 stop lowering and begin raising
the rear of the trailer to level the trailer.
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 both front jacks are 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 both front jacks are 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. The manual
UP and DOWN arrow buttons will function while the
"INCORRECT PROCEDURE" light is on.
3. Push the "AUTO LEVEL" button. The AUTO LEVEL light
will flash and the auto leveling procedure will begin. The
4. Make sure the master power switch is off any time the
touch panel is not active whether the jacks are extended
or retracted.
In the event the jacks"EXCESS SLOPE" SITUATIONS:
equipped with a (2) toggle switch panel that is used to
extend or retract the front jacks only. This panel should
be located at the front of the trailer and can be used to
extend the front jacks to unhitch the trailer.
leveling procedure is two stages; a basic leveling and
stabilizing procedure, then a precision leveling procedure.
Both procedures are done automatically after pushing the
"AUTO LEVEL" button one time.
leveling procedure may take a few minutes to accomplish
the desired level position. During precision leveling, the
pump will cycle between loading up and freewheeling. One
or two jacks will extend a very small amount during each
cycle. Each cycle will be about 10 seconds. When the level
sensor tolerances are satisfied, the system will shut off.
are unable to level the coach during the "basic" leveling
procedure, the "EXCESS SLOPE" light will come on.
Excess slope is one or 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 NOT 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
using the touch panel manual DOWN ARROW buttons,
turning the red warning lights out. Refer to the HITCHING
AND STORING JACKS section. Move the trailer to a more
level position or level the trailer as close as possible
according to the MANUAL LEVELING section. Cycling
power to the system will also turn the "EXCESS SLOPE"
light off.
The manual UP and DOWN ARROW buttons will
function when the "EXCESS SLOPE" light is on.

MP34.2850
09MAY13
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. 2. Push the rear down arrow (RETRACT button) until the weight of the trailer is off the rear jacks.
3. Hitch the trailer to the tow vehicle according to the
manufacturers instructions. Use the existing landing gear,
the front UP (EXTEND jacks) and DOWN (RETRACT jacks)
arrows or the two switch front jack panel.
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 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.
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 manual UP
DOWN arrow buttons will function while the "INCORRECT
PROCEDURE" light is on.
and the green "TRAVEL MODE" light is on, if so equipped.
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 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:
The trailer may be equipped with a (2) switch panel at
the front of the trailer that controls the front jacks. These
switches can be used to hitch the trailer to the tow vehicle.
The pump will run for 10 seconds after the last jack warning
light goes out and the power unit pressure switch is made.
10 seconds after that the retract valve will turn off along with
the touch panel STORE light. If a red warning light will not
go out or the pressure switch does not come on, the pump
will continue to run for 15 minutes and then shut off.
It is recommended to push the "STOP" button if the
pump runs longer than 1 minute after the last jack is
fully retracted.

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
10OCT13
MP34.3140
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 master power switch on.
2. Use the left front and right front UP arrow buttons
to extend the front jacks and unhitch the trailer, or use
5. Turn the master power switch off.
may not have enough stroke to level the trailer.
leveling the trailer. If the ground is too uneven, the jacks
Always give a front or rear yellow level light priority when
Extend jacks as needed to put out all the yellow lights.
If the rear yellow level light is on,
it is recommended to push the left front and right front
down arrow buttons until the rear yellow light goes out.
The trailer may have to be moved.
about 3/4 inch.
the (2) switch panel for the front jacks.

KEEP AWAY FROM WHEELS, 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.
WARNING!
allowing the pump motor to cool.
IMPORTANT: DO NOT hold the pump toggle switch
to "PUMP RUN" for more than 4 minutes without
2
1
VALVE
SIDE VIEW
CLOSED
VALVE
OPENED
MANIFOLD
3JACK
switch and close the #5 valve.
NOTE: It is best if jacks are extended in pairs; both
front, both rear, right front and right rear or left front
Close the #1 and #2 valves for the jacks
that were extended.
are extended as needed, release the pump toggle
Open the #5 valve on the pump manifold. Push the
pump toggle switch to PUMP RUN. When the jacks
Locate the PUMP RUN toggle switch on the pump
manifold bracket.
jacks that are to be extended.
Open valves #1 and #2 on the jack manifold for the
EXTENDING JACKS
and left rear.
Go to the pump/manifold assembly and open the #4
until all four jacks are completely retracted.
Push and hold the pump run toggle switch to "RUN"
Close the #3 valve at each of the jack manifolds.
Release the pump run switch and close the #4 valve.
PUMP MANIFOLD
TOP VIEW
PUMP RUN
AP46647
MOTOR SIDE
OPEN
TO
CLOSE
TO
5
6
manifold valve.
4 MINUTE
RUN LIMIT
PUMP RUN
01JUL11
MP34.3170
TANK SIDE
4
drop when the #3 jack manifold valve is opened.
to keep the vehicle from dropping rapidly. Vehicle will
valve is opened. Open the valve release cams slowly
vehicle to move in any direction when a jack manifold
open jack manifold valves. Allow ample room for the
Do not crawl under the vehicle to
RETRACTING JACKS
WARNING:
OPERATING PROCEDURES
PUMP RUN TOGGLE SWITCH
RELEASE CAM
VALVE
Use valve release cam to open and close valves.
the #3 jack manifold valve is completely open for all jacks.
With the weight of the vehicle off all the jacks, make sure
1 to 2 inches before moving to a different jack.
surface, do not allow the vehicle to drop more than
IMPORTANT: If the vehicle is on a severely unlevel
a jack, the #3 valve can be opened completely.
level a position as is possible. When there is no weight on
Alternate between all four jacks to lower the vehicle in as
Opening the #3 jack manifold valve slowly will allow the
vehicle to drop slowly.

SENSING UNIT INFORMATION
24AUG11
MP44.1614
PRECISION LEVELING SYSTEM
SENSING UNIT ADJUSTMENT
Power must be on for the leveling system to be able to adjust
the level sensing unit. Refer to the vehicle manufacturer for
this procedure.
There are three level sensing units. There is one sensing
unit for side to side leveling at the front of the vehicle and
one for side to side leveling at the rear of the vehicle. There
The central control module has a sensing unit adjustment
switch on the side of the box. This switch must be in the
"OVERRIDE" position while adjusting the sensing units.
Refer to the vehicle manufacturer for location of the central
control module.
IMPORTANT: The adjustment switch must be kept in the
"NORMAL" position for proper system operation. Only
move the switch if adjusting the level sensing units.
Only use adjustment nuts A and B to adjust the sensing
units. NEVER turn the pivot bolt when adjusting the
sensing units.
ADJUSTMENT NUT B
(Lights B & D)
LEVEL INDICATOR LIGHTS
PIVOT BOLT
(Lights A & C)
ADJUSTMENT NUT A
If level light A is on, turn adjustment nut A counterclockwise.
If level light B is on, turn adjustment nut B clockwise.
If level light C is on, turn adjustment nut A clockwise.
If level light D is on, turn adjustment nut B counterclockwise.
SENSING UNIT ADJUSTMENT PROCEDURE
1. Refer to the "MANUAL LEVELING" procedures page to
level the vehicle. Level the vehicle according to vehicle
2. Turn power on to the leveling system.
3. Turn the sensing unit adjustment switch to the
"OVERRIDE" position.
4. Adjust one sensing unit at a time. Turn adjustment nuts
A & B as necessary until all level indicator lights are off.
5. Repeat the procedure for all level lights on all three level
sensing units.
6. Move the sensing unit adjustment switch to the
"NORMAL" position.
7. Retract the jacks and move the vehicle to an unlevel
position. Do an automatic leveling procedure.
8. Repeat adjustment procedure as necessary.
ENHANCEMENT SWITCH
NORMAL
LEVEL SENSOR
ADJUSTING
OVERRIDE
ADJUST
POSITION
OPERATE
POSITION
SENSING UNIT ASSEMBLY - TOP VIEW
SENSING UNIT ASSEMBLY - SIDE VIEW
A
D
CB
If a sensing unit light is on, slowly turn the appropriate
adjustment nut until the light goes out. Keep turning
the same nut in the same direction until the opposite
light comes on.
Example: Light A is on. Turn adjustment nut A
counterclockwise until light A goes out and light C
comes on.
Quit turning the nut when the opposite light comes on.
Turn the same adjustment nut EXTREMELY slowly in
the reverse direction until both lights are out or until
the two lights are flickering back and forth.
EXAMPLE: Light C has come on. Quit turning
adjustment nut A counterclockwise. Now turn
adjustment nut A EXTREMELY slowly clockwise
until both lights C and A are off or until lights C
and A are flickering back and forth.
is one level sensing unit for front to rear leveling. Refer to
the vehicle manufacturer for mounting location of the sensing
units. Sensing units may be mounted close to equipment that
must be leveled precisely.
manufacturers specifications.