HWH 325 SERIES Manuale utente

OPERATOR’S MANUAL

ML40336/MP04.1961

05MAR07

Touch Panel Control

Hydraulic Leveling

FEATURING:

HWH CORPORATION

(On I-80, Exit 267 South)

2096 Moscow Road | Moscow, Iowa 52760

Ph: 800/321-3494 (or) 563/724-3396 | Fax: 563/724-3408

www.hwh.com

325 SERIES LEVELING SYSTEM

HWH TOUCH PANEL-CONTROLLED

Straight-Acting Jacks

With Jack Stop Rods

AP40335

CAUTION!

STORE

OFF

HWH HYDRAULIC LEVELING

UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES

SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.

FOR TRAILERS

CORPORATION

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:

(563) 724-3396 OR (800) 321-3494. Give your name and

coach was purchased, or the date of system installation,

Notify the dealership where you purchased the

vehicle or had the leveling system installed. Dealership

management people are in the best position to resolve

the problem quickly. If the dealer has difficulty solving

the problem, he should immediately contact the Customer

Service Department, at HWH CORPORATION.

If your dealer cannot or will not solve the problem,

notify the Customer Service Department:

HWH CORPORATION 2096 Moscow Rd. Moscow IA. 52760

address, coach manufacturer and model year, date the

SECOND:

FIRST:

authorization of an independent service facility, to be

defective part, either by appointment at the factory or by the

CORPORATION will authorize repair or replacement of the

determine whether or not your claim is valid. If it is, HWH

HWH CORPORATION personnel will contact you to

during business hours (8:00 a.m. till 5:00 p.m. c.s.t.).

description of the problem, and where you can be reached

determined by HWH CORPORATION. All warranty repairs

must be performed by an independent service facility

authorized by HWH CORPORATION, or at the

HWH CORPORATION factory, unless prior written approval

has been obtained from proper HWH CORPORATION

personnel.

CONTROL FUNCTIONS

This is the "ON" button for the leveling system.

This light indicates the system is on.

indicates a side or end of the trailer is low. Extend the appro-

priate jack pairs to put out the yellow light. One or two yellow

CONTROL IDENTIFICATION

CONTROL BUTTONS INDICATOR LIGHTS

MP24.1140

05MAR07

Fifth wheel trailers are equipped with

straight-acting jacks. The respective red WARNING light will

be on if a straight-acting jack is extended approximately

1/4 to 1/2 inch.

"ON" BUTTON:

NOTE: Side arrows operate the rear jacks only.

ON LIGHT:

LEVELING LIGHTS:

WARNING LIGHTS:

This button turns off control power to the

leveling system.

ON LIGHT WARNING LIGHTS

(4 - Red)

LEVELING LIGHTS

(4 - Yellow)

CAUTION!

STORE

OFF

HWH HYDRAULIC LEVELING

UNDERSTAND OPERATOR’S MANUAL BEFORE USING. BLOCK FRAME AND TIRES

SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.

"STORE" BUTTON

EXTEND FRONT BUTTON

RETRACT FRONT BUTTON

RETRACT RIGHT SIDE BUTTON

EXTEND RIGHT SIDE BUTTON

This button will retract all four jacks at the

same time. It is to be used only after the trailer has been hitched

to the tow vehicle.

extend their respective jacks and raise the trailer.

These buttons will

retract their respective jacks and lower the trailer.

"OFF" BUTTON:

"STORE" BUTTON:

EXTEND BUTTONS (UP ARROWS):

RETRACT BUTTONS (DOWN ARROWS):

STORE LIGHT

"ON" BUTTON

"OFF" BUTTON

EXTEND LEFT SIDE RETRACT LEFT SIDE

BUTTON

EXTEND REAR BUTTON

RETRACT REAR BUTTON

STORE LIGHT:

This light indicates the leveling system is in

the STORE mode.

These buttons will

LEVELING lights can be on at the same time. The trailer is

level when all yellow lights are out.

If a yellow LEVELING light is on, that

OPERATING PROCEDURES

SET UP PROCEDURE

1. Trailer must be unhitched from the tow vehicle before level-

ing. The HWH front jacks may be used to lift the trailer for

unhitching. If auxiliary jacks are used to unhitch the trailer,

If parking on soft ground or asphalt paving, a wood block or

for unhitching.

pad should be placed under each jack.

will result if raise arrows are operated for an extended

period of time.

2. The touch panel must be on for the system to function.

3. Lower the front of the trailer until the front yellow level

indicator lights come on. This is done by pushing the front

RETRACT button (DOWN ARROW). The red jacks down

4. A lit yellow LEVEL light indicates that the side, end or corner

of the trailer is low. Pushing the up arrow for corresponding yellow

level lights will extend that jack or jack pair to level the vehicle.

Extend jacks as needed to put out all the yellow lights. Always

give a side yellow level light priority when leveling the trailer.

If the ground is too uneven, the jacks may not have engough

stroke to level the trailer. The trailer may have to be moved.

5. After the trailer is level, the jacks not used for leveling may

be extended until they touch the ground. This provides addi-

6. Push the "OFF" button on the touch panel to turn the system

7. The jack stop rods should be adjusted immediately after

the leveling and stabilizing procedure is finished.

trailer is supported by the front jacks.

CAUTION:

WHILE SETTING STOP RODS AVOID

AREAS WHERE BODY MAY BE CRUSHED BY SUDDEN

DROPPING OR SLIDING OF TRAILER.

A. Remove retaining pin to allow stop rod to drop down to

the foot of the jack.

B. Lift stop rod as needed (up to 4") to align the hole in the

guide with the nearest available hole in the stop rod. Insert

the retaining pin through the holes in the guide and stop rod.

Latch the keeper wire for the retaining pin.

once a month or whenever the trailer is used. To keep

the system in operating condition.

STOP ROD

RETAINING PIN

STOP ROD POSITION

GUIDE

ROOM EXTENSION PROCEDURES

extension read this section carefully.

IMPORTANT: If the vehicle is equipped with a room

Refer to the vehicle owner’s manual for proper operation of

room extensions.

IMPORTANT: Do not use a room extension support

when the vehicle is supported by the leveling system.

warning lights will light when the jacks are extended

tional stability against wind and activity in the trailer. Jacks

off.

NOTE: Refer to the trailer manufacturer owner’s manual

IMPORTANT: Overheating and excessive current drain

NOTE: The jack stop rods should be set anytime the

NOTE: The leveling system should be cycled at least

05MAR07

MP34.3005

when the room is extended is not recommended.

IMPORTANT: Extending or retracting any leveling jacks

IMPORTANT: It is recommended to level and stabilize

the vehicle before extending the room.

extend the HWH front jacks to the ground and retract the

auxiliary jacks before the leveling system is used for leveling.

1/4 to 1/2 inch.

NOTE: When a side arrow (UP or DOWN) is pushed only

the rear jack on that side will extend or retract.

used to stabilize the trailer should lift the trailer about 3/4 inch.

OPERATING PROCEDURES

STOP ROD

RETAINING PIN

STOP ROD POSITION

1. Before retracting the jacks, the stop rods must be returned

to the travel position.

CAUTION: WHEN STORING THE JACK STOP

RODS, AVOID AREAS WHERE BODY MAY BE CRUSHED

BY SUDDEN DROPPING OR SLIDING OF TRAILER.

a. Remove the retaining pin. If the trailer weight is on the

stop rods, the front jacks may have to be extended slightly

to free the retaining pin.

b. Lift the stop rod to align the bottom hole in the stop rod

with the hole in the guide. Insert the retaining pin through

both holes and latch the retaining pin keeper wire.

3. Push and hold the rear RETRACT button until the rear

2. Push the "ON" button.

5. When the vehicle is securely hitched to the tow vehicle,

push the "STORE" button. All four jacks will retract. The

panel will automatically turn off 2 minutes after the last of

7. Visually inspect all of the jacks to make sure they are

fully retracted before moving the trailer.

CAUTION: ONLY USE THE "STORE" BUTTON

IF THE TRAILER IS HITCHED TO A TOW VEHICLE.

PREPARATION FOR TRAVEL

6. Press the "OFF" button to turn the system off.

WARNING lights are out.

MP34.3104

07MAR07

4. Hitch the trailer to the tow vehicle using the front

UP (extend jacks) DOWN (retract jacks) arrows according

to the procedure supplied by the trailer manufacturer.

the four red warning lights go out. If any red warning light

remains on, the system will try to store the jacks for 20

minutes from the time the "STORE" button is pushed,

then turn off.

OPERATING PROCEDURES

MP34.3300

07MAR07

MANUAL JACK RETRACTION

been opened far enough to allow the jacks to retract.

the T-Handle will turn harder. Make sure the valves have

will turn several turns easily. As the valve starts to open,

Large style with T-Handle valve release:

power unit. The upper most manifold should control

NOTE: Multiple manifolds may be present on the

retract the jacks.

if the STORE feature on the HWH control panel will not

Use the manual valve release for retracting the jacks only

DO NOT CRAWL UNDER THE VEHICLE, KEEP A SAFE

DISTANCE IN FRONT AND REAR OF THE VEHICLE.

THE VEHICLE MAY DROP AND/OR MOVE FORWARD

OR BACKWARD WITHOUT WARNING AS THE VALVE

RELEASE IS OPERATED.

1. Locate your power unit-manifold assembly.

2. Allow clearance for the vehicle to lower. If equipped with

CAUTION:KEEP AWAY FROM THE WHEELS,

point as internal damage may occur to the solenoid.

incorporated into the Breather Cap. Before using read

NOTE: As of APRIL 2002 a 1/4" Nut Driver has been

and understand the last page of this manual.

6. Check that all jacks are now retracted. If yes, continue.

7. Close the valves by turning each valve release clockwise.

DO NOT tighten the manual valve release past this

IMPORTANT: Once the manual valve release is snug,

9. The system should now be repaired before using again.

3. Using the diagrams below identify the style and location

5. Repeat the process by identifying then opening the two

rear control valves.

LARGE STYLE WITH T-HANDLE

VALVE RELEASE

SMALL STYLE

WITH VALVE

RELEASE NUT

LARGE STYLE

RELEASE NUT

WITH VALVE

PLASTIC PLUG

BREATHER

CAP

Small style with Valve Release Nut: DO NOT

1/4" valve release nut more than . Turning

the nut more could damage the valve.

release nut is located under a plastic plug that must be

removed to gain access.

could damage the valve.

Large style with Valve Release Nut:

The T-Handle

The 1/4" Valve

turn the

DO NOT turn the 1/4" valve

release nut more than . Turning the nut more

jack functions. (Valve styles and arrangements will vary)

POWER UNIT-MANIFOLD ASSEMBLY

MANIFOLD

of your two front jack control valves.

If no, notify the dealership where you purchased the vehicle

or had the leveling system installed or contact

(The diagram below represents a typical Power Unit-

MANUAL JACK RETRACTION

extensions are fully retracted prior to performing

IMPORTANT: HWH recommends that all HWH room

manual jack retraction procedures.

Manifold Assembly it may not be an exact match to yours).

4. Retract the front jacks by opening the correct valves.

Slowly turn the manual valve releases counter clockwise

until the jacks start to retract. Hitch the trailer to the tow

1 full turn

4 and 1/2 turns

HWH Corporation customer service.

FOR TRAILERS WITHOUT LOCK VALVE

RR RF LR

VALVE ARRANGEMENT

TRAILER

RIGHT

REAR

FRONT

RIGHT

LEFT

FRONT REAR

LEFT

landing gear, lower the landing gear to support the trailer

while manually retracting the jacks.

NOTE: The stop rods must be returned to the travel

position before retracting the front jacks.

vehicle during this operation if the vehicle is not equipped

8. Retract all landing gear before traveling.

with an alternate landing gear.

OPERATING PROCEDURES

MP34.3301

07MAR07

MANUAL JACK RETRACTION

been opened far enough to allow the jacks to retract.

the T-Handle will turn harder. Make sure the valves have

will turn several turns easily. As the valve starts to open,

Large style with T-Handle valve release:

power unit. The upper most manifold should control

NOTE: Multiple manifolds may be present on the

retract the jacks.

if the STORE feature on the HWH control panel will not

Use the manual valve release for retracting the jacks only

DO NOT CRAWL UNDER THE VEHICLE, KEEP A SAFE

DISTANCE IN FRONT AND REAR OF THE VEHICLE.

THE VEHICLE MAY DROP AND/OR MOVE FORWARD

OR BACKWARD WITHOUT WARNING AS THE VALVE

RELEASE IS OPERATED.

1. Locate your power unit-manifold assembly.

2. Allow clearance for the vehicle to lower. If equipped with

CAUTION:KEEP AWAY FROM THE WHEELS,

point as internal damage may occur to the solenoid.

incorporated into the Breather Cap. Before using read

NOTE: As of APRIL 2002 a 1/4" Nut Driver has been

and understand the last page of this manual.

6. Check that all jacks are now retracted. If yes, continue.

7. Close the valves by turning each valve release clockwise.

DO NOT tighten the manual valve release past this

IMPORTANT: Once the manual valve release is snug,

9. The system should now be repaired before using again.

3. Using the diagrams below identify the style and location

5. Repeat the process by identifying then opening the two

front control valves. Hitch the trailer to the tow vehicle

SMALL STYLE

WITH VALVE

RELEASE NUT

LARGE STYLE

RELEASE NUT

WITH VALVE

PLASTIC PLUG

BREATHER

CAP

Small style with Valve Release Nut: DO NOT

1/4" valve release nut more than . Turning

the nut more could damage the valve.

release nut is located under a plastic plug that must be

removed to gain access.

could damage the valve.

Large style with Valve Release Nut:

The T-Handle

The 1/4" Valve

turn the

DO NOT turn the 1/4" valve

release nut more than . Turning the nut more

jack functions. (Valve styles and arrangements will vary)

POWER UNIT-MANIFOLD ASSEMBLY

MANIFOLD

of your two rear jack control valves.

If no, notify the dealership where you purchased the vehicle

or had the leveling system installed or contact

(The diagram below represents a typical Power Unit-

MANUAL JACK RETRACTION

extensions are fully retracted prior to performing

IMPORTANT: HWH recommends that all HWH room

manual jack retraction procedures.

Manifold Assembly it may not be an exact match to yours).

4. Retract the rear jacks by opening the correct valves.

Slowly turn the manual valve releases counter clockwise

until the jacks start to retract.

1 full turn

4 and 1/2 turns

HWH Corporation customer service.

FOR TRAILERS WITH LOCK VALVE

RR LR

LOCK

VALVE ARRANGEMENT

TRAILER

RIGHT

REAR

LEFT

FRONT FRONT

RIGHT

landing gear, lower the landing gear to support the trailer

while manually retracting the jacks.

NOTE: The stop rods must be returned to the travel

position before retracting the front jacks.

during this operation if the trailer is not equipped with an

8. Retract all landing gear before traveling.

LARGE STYLE WITH T-HANDLE

VALVE RELEASE

alternate landing gear.

MAINTENANCE

All major components of the system can be replaced

with rebuilt units or can be sent to HWH CORPORATION to

be rebuilt, when the system is out of warranty.

MP44.0004

05MAR07

NOTE:

OIL LEVEL

UNUSUAL CONDITIONS

STOP ROD POSITION

RETAINING PIN

STOP ROD

FLUID: HWH Specialty Hydraulic Oil is recommended. In an

brake fluid or hydraulic jack fluid. Use of these can damage

and can cause staining should a leak occur. DO NOT USE

Dexron automatic transmission fluid contains red dye

emergency Dexron automatic transmission fluid can be used.

seals.

NOTE:

It is important that the four leveling units are fully retracted

before checking the hydraulic oil level. To check the oil

supply, remove the breather plug from the top of the

hydraulic oil reservoir. The oil level should be approximately

one inch below the top of the reservoir when adequately

filled.

In general, to insure the smooth operation of the leveling

system, it is a good idea to occasionally check the individual

leveling units to prevent problems. This is especially true

under the unusual conditions stated in the following:

If driving conditions are unusually muddy, the units may

become caked or clogged with mud. This condition may

hamper the proper operation of the leveling system. This

problem may be prevented or remedied by cleaning off each

leveling unit if they become excessively muddy.

In wet or icy weather leveling units may become encrusted

with ice. This may cause the leveling system to function

improperly. To eliminate this problem, periodically check the

leveling units and break loose any ice which may be causing

improper operation.

The stop rods and retaining pins on the front jacks must be

kept in good operating condition. Clean and lubricate the

rod and retaining pin regularly.

Do not move the trailer while the leveling units are still in

contact with the ground. Visually check to see if the leveling

units have returned to the STORE/TRAVEL position before

moving the trailer.

MAINTENANCE/SERVICE

SENSING UNIT ADJUSTMENT

Level the vehicle by placing a bubble level in the center of

the freezer floor or upon whichever surface within the vehicle

that is to be level. Using the Leveling System and the bubble

level, ignoring the yellow LEVEL lights on the Touch Panel,

level the vehicle until the bubble is centered.

The Sensing Unit is mounted inside the Control Box. The

Control Box is mounted to the power unit/valve assembly.

NOTE: If opposing LED’s are lit, there is a problem with

the Sensing Unit.

If LED (A) is lit: Turn the adjustment screw COUNTER

CLOCKWISE until the LED is off.

If LED (C) is lit: Turn the adjustment screw CLOCKWISE

until the LED is off.

If LED (B) is lit: Turn the adjustment nut COUNTER

CLOCKWISE until the LED is off.

until the LED is off.

If LED (D) is lit: Turn the adjustment nut CLOCKWISE

ADJUSTMENT

NUT (5/16")

TOP VIEW - SENSING UNIT

ADJUSTMENT

NUT ADJUSTMENT SCREW

CONTROL

BOX WALL

LED’S - LOCATION SIDE VIEW - CONTROL BOX

MAY BE DIFFERENT

07MAR07

MP44.1500

There are four LED’s on the Sensing Unit, A,B,C and D. Refer

to the drawing below. The Sensing Unit is adjusted by turning

the adjustment nut to turn out LED’s B and D. The adjustment

screw will turn out LED’s A and C. If the adjustment nut has

to be turned more than 1/2 flat or the adjustment screw has to

be turned more than 3/4 turn to turn the LED out, there may

be a problem with the Sensing Unit or the mounting of the

Control Box. If two LED’s are on, it is best to make the B-D

adjustments first, then hold the adjustment nut from moving

ADJUSTMENT NUT

while making the A-C adjustment.

ADJUSTMENT

SCREW (Phillips or 1/4")

NUT (7/8" or 3/4")

ADJUSTMENT

With the vehicle level according to the bubble level, if there

are no yellow lights lit on the Touch Panel, the sensing unit is

properly adjusted. If there are yellow LEVEL lights lit on the

Touch Panel, manual adjustments to the Sensing Unit are

needed. A 7/8", 3/4" or 5/16" socket w/driver or box end

wrench and a philips screw driver will be needed.

IMPORTANT: When all 4 LED’s are off, move the

vehicle to an unlevel position so one or two yellow

lights are on. Level the vehicle according to the yellow

LEVEL lights. Recheck the level. If more adjustment is

needed, DO NOT try to adjust the sensing unit until the

yellow level lights go out, instead just "tweak" the

sensing unit, ignoring the LED’s on the sensing unit.

Example: After the initial adjustment and releveling

the vehicle, the front is still low. This means the front

yellow level light is turning off too soon. Determine

which sensing unit light is the front light, A-B-C or D.

Move the adjustment for that light very, very, slightly in

the OPPOSITE direction that is given in the above

instructions for LED’s A, B, C, and D. This will allow

the front yellow light to stay on slightly longer to bring

the front up more. Again, unlevel the vehicle then

relevel the vehicle using the yellow level lights on the

touch panel. Recheck with a level. Repeat the

"tweaking" process until the system levels the vehicle

properly.

BREATHER CAP - DIPSTICK - 1/4" NUT DRIVER

MP84.9999

07FEB07

VALVE RELEASE

NUT 1 1/2" DIAMETER

SOLENOID VALVE

NOTE: DO NOT turn the valve

release nut more than 4 and 1/2

(four and one half) turns counter

clockwise. Damage to the valve

may result.

OIL LEVEL

BREATHER CAP

OIL LEVEL GROOVES

1/4" NUT DRIVER

NOTE: THE BREATHER CAP IS LOCATED

ON THE TOP SIDE OF THE POWER UNIT RESERVOIR.

IMPORTANT: PRIOR TO REMOVING THE BREATHER CAP,

EITHER TO CHECK THE OIL LEVEL OR TO USE THE 1/4" NUT DRIVER,

CLEAN ANY DEBRIS FROM THE TOP OF THE RESERVOIR.

INCLUDING DEBRIS INSIDE THE 1/4" NUT DRIVER.

REMOVE ANY PAINT CHIPS OR OTHER DEBRIS FROM THE DIPSTICK

BEFORE RETURNING THE BREATHER CAP TO THE RESERVOIR,

VALVE RELEASE

NUT

to the valve may result.

turn counter clockwise. Damage

NOTE: DO NOT turn the valve

release nut more than 1 full

PLASTIC PLUG

REMOVE TO

GAIN ACCESS

TO THE 1/4"

VALVE RELEASE

NUT

SOLENOID VALVE

2 1/4" DIAMETER

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