ML13527 - HWH Corporation

HWH R 

CORPORATION 

OPERATOR’S MANUAL 

HWH JOYSTICK-CONTROLLED 

210 SERIES LEVELING SYSTEM 

and 

SPACEMAKER ROOM EXTENSION SYSTEM 

R 

R 

FEATURING: 

R 

Joystick BI-AXIS Leveling Control 

Hydraulic Leveling 

Kick-Down Jacks 

One Room Extension 

HWH HYDRAULIC LEVELING 

ON NOT IN 

PARK/ 

EXTEND 

BRAKE 

FRONT 

OPERATE 

EXTEND 

EXTEND 

LEFT 

RIGHT 

EXTEND 

REAR 

STORE 

FRONT 

ON 

FUSE 

5 AMP 

OFF 

STORE 

REAR 

CAUTION! 

OPERATE 

UNDERSTAND OPERATOR’S MANUAL BEFORE USING. 

BLOCK FRAME AND TIRES SECURELY BEFORE 

REMOVING TIRES OR CRAWLING UNDER VEHICLE. 

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 

AP13528 

ML13527/MP05.2002 

26FEB04

OPERATOR’S MANUAL 

CAUTION ! 

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 VEHICLE WHILE LEVELING SYSTEM AND ROOM EXTENSION ARE BEING OPERATED. 

THE JACKS MAY ABRUPTLY SWING UP WHEN THE FOOT CLEARS THE GROUND OR WHEN JACK REACHES FULL 

EXTENSION. 

NEVER PLACE HANDS OR OTHER PARTS OF THE BODY NEAR HYDRAULIC LEAKS. OIL MAY PENETRATE 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 THIS 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 FOR- 

WARD OR BACKWARD OFF THE JACKS. 

NOTE: KEEP THE CONTROL VALVE LEVERS IN THE STORE POSITION WHEN JACKS ARE NOT IN USE. 

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: 

FIRST: 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. 

SECOND: If your dealer cannot or will not solve the problem, 

notify the Customer Service Department: 

HWH CORPORATION 2096 Moscow Rd. Moscow IA. 52760 

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

address, coach manufacturer and model year, date the 

coach was purchased, or the date of system installation, 

description of the problem, and where you can be reached 

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

HWH CORPORATION personnel will contact you to 

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

CORPORATION will authorize repair or replacement of the 

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

authorization of an independent service facility, to be 

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. 

MP15 

30MAY01

CONTROL IDENTIFICATION 

"NOT IN 

PARK/BRAKE" LIGHT 

"ON" LIGHT 

WARNING LIGHTS 

(4 - Red) 


ON NOT IN 

OPERATE 

PARK/ 

EXTEND 

BRAKE 

FRONT 

EXTEND 

EXTEND 

LEFT 

RIGHT 

FRONT STORE LEVER 

(Operate Position) 


(Store/Travel Position) 

LEVELING LIGHTS 

(4 - Yellow) 

EXTEND 

REAR 

STORE 

FRONT 

JACK CONTROL LEVER 

ON 

FUSE 

5 AMP 

CONTROL CIRCUIT FUSE 

(5 Amp) 

"ON/OFF" SWITCH 

OFF 

STORE 

REAR 

REAR STORE LEVER 

(Store/Travel Position) 

CAUTION! 

OPERATE 





(Operate Position) 

CONTROL FUNCTIONS 

CONTROL BUTTONS 

"ON/OFF" SWITCH: This is the "ON/OFF" switch for the leveling 

system. It provides control power to operate the electrical relay on 

the pump and the LEVELING LIGHTS. It does not control power 

to the four red WARNING LIGHTS or the master "JACKS DOWN" 

warning light. 

STORE LEVERS: These two levers are used to retract the jacks 

into the STORE/TRAVEL position. They must be in the operate 

position for leveling. 

JACK CONTROL LEVER: Jacks are extended in pairs by pushing 

the jack control lever to one of the EXTEND positions. This 

movement of the lever activates the pump and directs hydraulic 

fluid to the jacks. When the lever is released it will return to the 

neutral (center) position, turning off the pump and stopping jacks 

in position. 

INDICATOR LIGHTS 

ON LIGHT: This light indicates the system is on. 

This indicator light is on when 

"NOT IN PARK/BRAKE" LIGHT: 

the switch is on, but the hand/auto park brake is not set. 

LEVELING LIGHTS: If a yellow LEVELING light is on, that 

indicates a side or end of the vehicle is low. Extend the appropriate 

jack pairs to put out the yellow light. Only one yellow 

leveling light should be on at a time. The vehicle is level when 

all yellow lights are out. 

WARNING LIGHTS: A red WARNING light will be on whenever 

the corresponding jack is in the vertical position provided 

the ignition switch is in the "ACCESSORY" or "ON" position. 

Some coaches are equipped with a dash mounted master "JACKS 

DOWN" light which will be on when one or more jacks are 

in the vertical position, provided the ignition switch is "ON". 

MP25.2005 

29OCT96

R 

CONTROL IDENTIFICATION 

ROOM OPERATOR’S PANEL 

HWH 

CORPORATION 

HYDRAULIC ROOM EXTENSION 

KEY SWITCH 

OFF 

EXTEND 

ROOM CONTROL 

SWITCH 

ON 

CAUTION! 

UNDERSTAND OPERATOR’S MANUAL BEFORE 

USING. KEEP PEOPLE AND OBSTRUCTIONS 

CLEAR OF ROOM WHEN OPERATING. 

RETRACT 

KEY 

CONTROL FUNCTIONS 

KEY SWITCH: The KEY SWITCH controls power to the ROOM 

CONTROL SWITCH. When the KEY SWITCH is in the "ON" 

POSITION the room can be operated, and the key cannot be 

removed. When the KEY SWITCH is in the "OFF" position 

the room cannot be operated, and the key can be removed. 

ROOM CONTROL SWITCH: The ROOM CONTROL SWITCH 

is a two position momentary switch. Pressing the switch in 

the EXTEND POSITION will extend the room. Pressing the 

switch in the RETRACT POSITION will retract the room. Releasing 

the ROOM CONTROL SWITCH will halt the operation 

of the room. 

MP25.9405 

30JAN97

EXTEND 

LEFT 

ON 

EXTEND 

FRONT 

EXTEND 

REAR 

ON 

OFF 

NOT IN 

PARK/ 

BRAKE 

EXTEND 

RIGHT 

OPERATE 

STORE 

FRONT 

FUSE 

5 AMP 

STORE 

REAR 

OPERATE 




OPERATING PROCEDURES 

SITE SELECTION 

Maintain adequate clearance in all directions for vehicle, 

room extensions, awnings, doors, steps, ect. Vehicle may 

move in any direction due to jacks extending or retracting, 

settling of jacks or vehicle, equipment malfunction, ect. 

Park with the front of the vehicle facing downhill if possible. 

Care must be taken not to raise the rear of the vehicle too 

high or the vehicle may roll forward or backward off the jacks. 

If parking on soft ground or asphalt paving, wood blocks or 

pads should be placed under the jacks. 

ROOM EXTENSION PROCEDURES 

IMPORTANT: If the vehicle is equipped with a room extension 

read this section carefully. 

If the vehicle is equipped with kick-down jacks, the wheels MUST 

be blocked securely. Do NOT operate any room extension 

until the leveling and stabilizing procedure is complete. Do 

NOT retract the leveling system until all room extensions are 

retracted. NEVER operate the leveling system when any room 

extensions are extended. 

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. 

LEVELING PROCEDURE 

OPERATE POSITION 

FRONT 


STORE 

LEVER 

JACK 

CONTROL 

LEVER 

CAUTION! 

LEVER POSITIONS 

REAR 

STORE 

LEVER 

1. Place gear selector in the parking position, apply park brake 

and block tires securely. 

NOTE: If the hand/auto park brake is not set, the "NOT IN 

PARK/BRAKE" light will come on when the "ON/OFF" switch 

is on. The pump will not run if the park brake is not set. 

2. Turn ignition switch to "ON" or "ACCESSORY". 

3. Push the "ON/OFF" switch to the "ON" position. The POW- 

ER ON light will be lit. 

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

of the vehicle is low. Only one yellow LEVEL light should be lit 

at a time. If a corner of the vehicle is low a side LEVEL light will 

be on by itself. 

Move the JACK CONTROL LEVER to the extend position to extend 

jack pairs corresponding to a lit yellow light. Extend jack pairs 

accordingly until all yellow lights are out. It may take several movements 

from side to front, or side to rear to raise a low corner. If 

the ground is too uneven, the jacks may not have enough stroke to 

level the vehicle. The vehicle may have to be moved. Remember, 

if the rear of the vehicle is lifted too high, the vehicle may roll 

forward or backward off the jacks. 

7. After the vehicle 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 vehicle. Do this by pushing 

the jack control lever to the rear and/or front as needed to extend 

any remaining jacks, until they contact the ground and lift the 

vehicle approximately 3/4 of an inch. Do not use the right or 

left extend positions. 

8. Push the "ON/OFF" switch to the "OFF" position. 

9. Turn the ignition switch off. 

4. Move the FRONT and REAR STORE LEVERS to the OPERATE 

POSITION. Nothing should happen at this time. 

5. Swing the jacks to the vertical position by pushing the center 

jack control lever to FRONT EXTEND then REAR EXTEND. The 

respective red WARNING light will be lit as soon as the jack 

swings vertical. Check that all jacks have swung to the vertical 

position. Place pads under jacks if necessary at this time. 

MP35.2005 

19NOV07

EXTEND 

LEFT 

ON 

EXTEND 

FRONT 

EXTEND 

REAR 

ON 

OFF 

NOT IN 

PARK/ 

BRAKE 

EXTEND 

RIGHT 

OPERATE 

STORE 

FRONT 

FUSE 

5 AMP 

STORE 

REAR 

OPERATE 





RETRACT PROCEDURES 

STORE/TRAVEL POSITION 

FRONT 


STORE 

LEVER 

JACK 

CONTROL 

LEVER 

CAUTION! 

REAR 

STORE 

LEVER 

EXTEND POSITION 

STORE/TRAVEL POSITION 

LEVER POSITIONS 

JACK POSITIONS 

CAUTION: MAKE SURE THAT PEOPLE AND 

EQUIPMENT ARE CLEAR OF THE VEHICLE. 

IMPORTANT: Room extensions should be fully 

retracted before retracting the leveling system. 

1. Move the STORE LEVERS to the STORE/TRAVEL 

POSITION. This will allow the jacks to retract. As soon as 

a jack foot clears the ground, the jack will swing horizontal 

and continue to retract. 

CAUTION: THE STORE LEVERS SHOULD BE KEPT 

IN THE "STORE" POSITION WHILE TRAVELING TO KEEP 

THE JACKS IN THE STORE/TRAVEL POSITION. 

2. Visually check that all jacks are in the STORE/TRAVEL 

position. With the ignition switch in the "ON" or "ACCESS- 

ORY" position, the red WARNING lights and the master 

"JACKS DOWN" light will be out. 

CAUTION: DO NOT RELY SOLELY UPON 

THE WARNING LIGHTS. IT IS THE OPERATOR’S 

RESPONSIBILITY TO CHECK THAT ALL JACKS 

ARE IN THE STORE/TRAVEL POSITION BEFORE 

MOVING THE VEHICLE. 

3. Push the "ON/OFF" switch on the panel to the "OFF" 

position. Turn ignition off or proceed to travel. 

NOTE: If the vehicle is parked or stored with the jacks 

extended for an extended period of time and the jacks 

fail to retract completely, extend the jacks back down 

to the ground then retract the jacks again. 

MP35.2010 

01JUL05


CAUTION: 

OPERATING THE ROOM WITH ANY 

ROOM-LOCKING DEVICES LOCKED OR THE MANUAL- 

RETRACT WINCH ATTACHED CAN CAUSE PERSONAL 

INJURY AND VEHICLE DAMAGE. IT IS THE OPERATOR’S 

RESPONSIBILITY TO ENSURE THAT ALL ROOM-LOCKING 

DEVICES AND THE MANUAL-RETRACT WINCH ARE DIS- 

ENGAGED BEFORE OPERATING THE ROOM. 

IMPORTANT: Do not extend or retract any jacks when the 

room is extended. 

IMPORTANT: Always level and stabilize the vehicle before 

extending the room. 

ROOM EXTEND PROCEDURE 

6. To extend the room, press and hold the 

ROOM CONTROL SWITCH in the "EXTEND" position 

until the room is fully extended. 

NOTE: Hold the switch to "EXTEND" three or four seconds 

after the room is fully extended. This assures proper 

pressurization of the cylinders. During normal operation 

of the room, do not reverse direction of the room until 

the room is fully extended. If necessary, the direction 

of the room may be reversed, but watch for binding of 

the room. If the direction of the room has been 

reversed, DO NOT re-extend the room until the room 

has been fully retracted. 

1. Follow the LEVELING AND STABILIZING PROCEDURE. 

2. Unlock all room-locking devices. 

NOTE: If the MANUAL RETRACT WINCH is attached to the 

room remove it before extending the room. 

CAUTION: 

KEEP PEOPLE AND OBSTRUCTIONS 


NOTE: Make sure there is adequate clearance to fully extend 

the room. 

3. Turn the ignition switch to ACCESSORY. 

4. Push the ON/OFF switch on the leveling system control 

panel to "ON" if the POWER ON LIGHT is not illuminated. 

5. Insert the KEY and turn the KEY SWITCH to the "ON" 

position. 

IMPORTANT: Do not hold the ROOM CONTROL SWITCH 

in the "EXTEND" position for more than ten seconds 

after the room is fully extended or stops moving. 

If either side of the room stops moving, release the 

room control switch immediately. DO NOT force the 

room. DO NOT reverse direction of the room, contact 

HWH Customer Service for assistance 1-800-321-3494. 

NOTE: Releasing the ROOM CONTROL SWITCH will halt 

the operation of the room. 

7. Turn the KEY SWITCH to the "OFF" position and remove 

the key to prevent undesired operation of the room. 


panel to "OFF." 

9. Turn off the ignition switch. 

IMPORTANT: Do not use a room extension support when 

the vehicle is supported by the leveling system. 

MP35.9445 

24JAN02


CAUTION: KEEP PEOPLE AND OBSTRUCTIONS 


IMPORTANT: Do not extend or retract any leveling jacks 

when the room is extended. 

1. Turn the ignition switch to ACCESSORY. 

ROOM RETRACT PROCEDURE 

IMPORTANT: Do not hold the ROOM CONTROL SWITCH 

in the "RETRACT" position for more than ten seconds 

after the room is fully retracted or stops moving. 

If either side of the room stops moving, release the 

room control switch immediately. DO NOT force the 

room. DO NOT reverse direction of the room, contact 

HWH Customer Service for assistance 1-800-321-3494. 


panel to "ON." 

NOTE: Releasing the ROOM CONTROL SWITCH will halt 

in operation of the room. 

3. Insert the KEY and turn the KEY SWITCH to 5. Turn the KEY SWITCH to the "OFF" position and remove 

the "ON" position. 

the key to prevent undesired operation of the room. 

4. To retract the room press and hold the ROOM CONTROL 

SWITCH in the RETRACT position. When the room is fully 

retracted, release the ROOM CONTROL SWITCH. 

NOTE: Hold the switch to "RETRACT" three or four seconds 

after the room is fully retracted. This assures proper 

pressurization of the cylinders. During normal operation 

of the room, do not reverse direction of the room until 

the room is fully retracted. If necessary, the direction 

of the room may be reversed, but watch for binding of 

the room. If the direction of the room has been 

reversed, DO NOT retract the room until the room 

has been fully extended. 


panel to "OFF." 

7. Turn the ignition switch off. 

8. Engage all room-locking devices. 

9. If the room will not retract see the MANUAL ROOM 

RETRACT PROCEDURE. 

IMPORTANT: Room-locking devices should be locked 

while traveling. 

MP35.947C 

06FEB02

MANUAL ROOM RETRACT PROCEDURE 

(WITH SOLENOID VALVES WITH VALVE RELEASE "T" HANDLES) 

(USE ONLY WHEN THE ROOM WILL NOT RETRACT WITH THE ROOM CONTROL SWITCH) 

OVERVIEW 

The room can be retracted manually if a hydraulic or electric 

failure prevents the room from being retracted using the 

CONTROL SWITCH. For normal retract sequence see the 

ROOM SLIDE RETRACT PROCEDURES. Refer to the 

vehicle manufacturer for storage location of the 

retract device and information for connecting the 

device to the room. 

IMPORTANT: If the vehicle is not equipped with a winch, 

DO NOT use other pulling devices to retract the room. 

Follow steps 2 and 3 and try pushing the room in. 

Contact the vehicle manufacturer or HWH Customer 

Service at 1-800-321-3494 or 563-724-3396 for assistance. 

WARNING: THE MANUAL RETRACT WINCH IS 

EQUIPPED FOR MANUALLY RETRACTING THE ROOM 

ONLY. IT IS NOT TO BE USED FOR LIFTING OR ANY 

OTHER APPLICATION. HIGH FORCES ARE CREATED 

WHEN USING A WINCH, CREATING POTENTIAL SAFETY 

HAZARDS. FAILURE TO FOLLOW ALL CAUTIONS AND 

INSTRUCTIONS MAY CAUSE FAILURE OF THE MANUAL 

RETRACT WINCH OR CONNECTIONS RESULTING IN 

DAMAGE OR PERSONAL INJURY. MAINTAIN FIRM GRIP 

ON THE WINCH HANDLE AT ALL TIMES. NEVER RELEASE 

THE HANDLE WHEN RATCHET LEVER IS IN THE OFF 

POSITION AND THE WINCH IS LOADED. THE WINCH 

HANDLE COULD SPIN VIOLENTLY AND CAUSE PERSONAL 

INJURY. CHECK THE WINCH AND STRAPS FOR DAMAGE 

OR WEAR, AND CHECK FOR PROPER RATCHET OPERATION 

ON EACH USE OF THE WINCH. DO NOT USE IF DAMAGED 

OR WORN. 

1. Retract jacks following the LEVELING SYSTEM RETRACT 

PROCEDURE. 

NOTE : When manually retracting the room, make sure the 

jacks are retracted before retracting the room. 

2. Locate the HYDRAULIC PUMP/MANIFOLD unit. 

"T" 

HANDLES 

SOLENOID VALVES 

NOTE : The "T" HANDLE may turn easily at first but 

will become more difficult to turn as an internal spring is 

compressed. Be sure to open both valves completely 

(about six turns of the "T" HANDLE). 

NOTE : The room may move slightly as the SOLENOID VALVES 

are opened and internal pressure is released. 

4. Locate the MANUAL RETRACT WINCH and connect it to 

the room according to the vehicle manufacturer’s instructions. 

To extend the WINCH STRAP firmly grasp WINCH HANDLE, 

place RATCHET LEVER in its OFF position, and slowly rotate 

the WINCH HANDLE counterclockwise, keeping a firm grip on 

the handle. When enough WINCH STRAP is extended, place the 

RATCHET LEVER in its ON position and slowly rotate the WINCH 

HANDLE clockwise until the RATCHET LEVER locks. 

ON 

OFF 

WINCH STRAP 

RATCHET LEVER 

WINCH HANDLE 

MANUAL RETRACT WINCH 

WINCH 

HOOK 

5. Slowly winch the room in by turning the WINCH HANDLE 

clockwise. The RATCHET LEVER should produce a loud, sharp, 

clicking noise. 

NOTE : Winching the room in quickly will raise pressure in the 

hydraulic fluid and make winching more difficult. 

WARNING: 

OPERATE THE MANUAL RETRACT WINCH 

BY HAND POWER ONLY. IF THE WINCH CANNOT BE 

CRANKED EASILY WITH ONE HAND IT IS PROBABLY OVER- 

LOADED. IF WINCHING BECOMES TOO DIFFICULT STOP 

AND CHECK FOR OBSTRUCTIONS OR RESTRICTIONS ON 

THE ROOM AND ROOM EXTENSION MECHANISM. 

6. When the room is fully retracted, engage the room locking 

devices. Leave the retract winch in place. 

WARNING: THE ROOM EXTENSION SOLENOID VALVE 

"T" HANDLES MUST BE IN THE OPEN POSITION WHEN THE 

MANUAL RETRACT WINCH IS ENGAGED. 

HYDRAULIC PUMP/MANIFOLD 

7. The system should be repaired before using again. 

3. Open the SOLENOID VALVES by turning the "T" HANDLES 

counterclockwise. 

MP35.9490 

02FEB12

MAINTENANCE 

9,000 lb. JACK 16,000 lb. JACK 

ROLLER 

ASSEMBLY 

It is important that all of the jacks 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. 

On the 9,000 lb. jacks and the 16,000 lb. jacks there are roller assemblies 

that need to rotate freely. (See above FIGURE) These 

rollers should be cleaned with a penetrating fluid, such as WD-40, 

and lubricated with a light oil as part of your regular maintenance 

schedule. 

FLUID LEVELS 

JACK MAINTENANCE 

UNUSUAL CONDITIONS 

FLUID: HWH Specialty Hydraulic Oil is recommended. In an 

emergency Dexron automatic transmission fluid can be used. 

NOTE: Dexron automatic transmission fluid contains red dye 

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

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

seals. 

In general, to insure the smooth operation of the leveling system, 

it is a good idea to occasionally check the individual leveling 

jacks to prevent problems. This is especially true under the unusual 

conditions stated in the following: 

If driving conditions are unusually muddy, the jacks 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 jack if they 

become excessively muddy. 

In wet or icy weather leveling jacks may become encrusted with 

ice. This may cause the leveling system to function improperly. 

To eliminate this problem, periodically check the leveling jacks 

and break loose any ice which may be causing improper operation. 

Do not move the vehicle while the leveling jacks are still in 

contact with the ground. However, if this should accidentally 

happen, the leveling system was designed to protect itself 

from damage in most cases. Place the system in the 

STORE mode and then visually check to see if the leveling 

jacks have returned to the STORE/TRAVEL POSITION. 

NOTE: All major components of the system can be replaced 

with rebuilt parts or can be sent to HWH CORPORATION to 

be rebuilt, when the system is out of warranty. 

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 

clean. All electrical connections, especially ground connections, 

should be clean, tight, free from corrosion and protected from 

weathering. 

MP45 

01JUN01

MAINTENANCE 

SYSTEM ADJUSTMENT 

SET SCREW, 

HORIZONTAL 

ADJUSTMENT 

LOWER 

ADJUSTING 

NUT 

UPPER 

ADJUSTING 

NUT 

SET SCREW 

6,000 lb. JACKS 

ADJUSTING 

LOCK NUTS, 

VERTICAL 

ADJUSTMENT 

STANDARD & 

LOW PROFILE 

UNITS 


STOP 

ADJUSTING 

CAP 

HEAVY DUTY 

LEVELING 

UNITS 


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. 

1. 6,000 lb. JACKS: 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 

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. 

NOTE: The two front jacks should be adjusted to the same 

horizontal position. 

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 components, 

tanks, etc. 

JACK ADJUSTMENT 

LEVEL SENSING UNIT ADJUSTMENT 

2. 9,000 lb. JACKS: 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 

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. 

3. 16,000 lb. JACKS: If the jack stopped short of being vertical 

loosen the set screw and turn the adjusting cap clockwise. 

If the jack went beyond vertical, loosen the set screw and turn 

the adjusting cap counterclockwise. After each adjustment, 

the weight of the vehicle must be applied to the jack to make 

the adjustment effective. DO NOT adjust cap more than one 

turn without cycling the jack. 

The horizontal stop on the heavy-duty jack is adjusted by adding 

washers under the urethane stop. 

Level the vehicle by placing a circular bubble level in the 

center of the freezer floor or location within the vehicle that 

is to be level. With the vehicle level, adjust the sensing unit 

until all yellow lights are off. This is done by drawing up the 

corresponding screw if the sensing unit is mounted below 

the surface as shown or backing out the corresponding 

screw if the sensing unit is mounted above the surface. 

Bump the sensing unit to see that it is settled tight against 

all three screw heads and still indicates that the unit is level. 

ELECTRONIC LEVEL SENSING UNIT 

BELOW THE SURFACE MOUNTING 

FRONT 

THIS 

SIDE 

UP 

MOUNTING SURFACE 

SPRINGS (3) 

SCREWS (3) 

MP45.0 

13FEB03

TROUBLE SHOOTING 

210/225 SERIES BI-AXIS VALVE 

The following is a list of problems, and possible solutions, which might occur to the leveling system. 

NOTE: Only qualified technicians should install or repair leveling systems on vehicles. A knowledge of hydraulics, welding, the 

vehicle’s suspension and electrical system, as well as an understanding of the leveling system’s hydraulics and electronics 

is required. 

1. JACK RETRACTS AFTER COACH IS LEVEL. 

A. Hose or jack has external leak. 

B. Fluid is leaking back to reservoir through control valve. 

2. LEVELING JACKS WILL NOT RETRACT COMPLETELY. 

A. Actuator rod bent or scored (rod will not move freely). 

B. Jack clogged with mud or ice. 

C. Main rod bent or scored. 

D. Valve plunger not completely depressed by valve handle. 

E. Springs weak or broken. 

F. Hydraulic line pinched. 

3. UNIT IS EXTENDED BUT NOT VERTICAL. 

A. Move the store lever to the "STORE" position and wait two 

minutes. Be sure the jack is fully retracted, then try again. 

B. Roller assembly frozen or missing. 

C. Actuator rod bent. 

D. Actuator not functioning properly. 

4. IGNITION SWITCH ON, BUT NO POWER TO PUMP AND/ 

OR LIGHTS. 

A. Park brake not set. 

B. 12 or 24 volts (as applicable) from main 

power source not present. 

C. Faulty PC board. 

D. Faulty wire or electrical connection. 

5. PUMP WILL NOT ACTIVATE. 

A. Grounding switch on valve not working. 

B. Pump relay not functioning. 

C. Pump not grounded. 

6. HYDRAULIC PUMP ACTIVATES WITHOUT USE OF 

CONTROL VALVE HANDLES. 

A. Grounding switch at valve shorted. 

B. Pump relay stuck. 

C. Relay control wire shorted to ground. 

7. HYDRAULIC PUMP ACTIVATES, BUT THE JACKS 

WILL NOT EXTEND. 

A. Store levers not in the operate position. 

B. Oil supply low in reservoir. 

C. Pump is not developing pressure. 

D. Broken hydraulic line. 

8. LEVELING LIGHTS (YELLOW) NOT FUNCTIONING 

PROPERLY. 

A. Yellow lights will not go out when vehicle is level: 

adjust sensing unit. 

B. If two or more lights are on replace PC board and 

check sensing unit 

9. WARNING LIGHTS (RED) NOT FUNCTIONING 

PROPERLY. 

A. Light will not come on: check for broken wire at 

warning switch on the jack. 

B. Lights will not go out bad warning switch or wires 

are shorted to ground. 

C. Check PC board. 

MP55 

28AUG07

HYDRAULIC CONNECTION DIAGRAM 

BI-AXIS VALVE LEVELING SYSTEM 

WITH ROOM EXTENSION 

PRESSURE 

FRONT 

RETURN 

LF 

PRESSURE 

RF 

LEFT 

FRONT 

JACK 

RIGHT 

FRONT 

JACK 

RETURN 

SEE HYDRAULIC 

CONNECTION DIAGRAM 

ROOM EXTENSION 

LEFT 

REAR 

JACK 

RIGHT 

REAR 

JACK 

LR 

RR 

MP65.9406 

21SEP96

HYDRAULIC SCHEMATIC DIAGRAM 

200/210/225 SERIES JOY STICK BI-AXIS LEVELING SYSTEM 

WITH STRAIGHT-ACTING JACKS 


("OPERATE" POSITION) 

LF JACK 

RF JACK 

"FRONT 

RAISE" 

JACK CONTROL 

LEVER 

"LEFT 

RAISE" 

"RIGHT 

RAISE" 

ONE LEVER BI-AXIS 

CONTROL VALVE 

"REAR 

RAISE" 


("OPERATE" POSITION) 

LR JACK 

RR JACK 

ROOM 

EXTENSION 

MANIFOLD 

(IF APPLICABLE) 

RETURN 

PRESSURE 

HYDRAULIC PUMP 

M 

MP65.9435 

04FEB03


VERTICAL ARM ROOM EXTENSION 

WITH SYNCHRONIZING CYLINDER 

SEE HYDRAULIC 


BI-AXIS VALVE LEVELING 

SYSTEM WITH ROOM 

EXTENSION. 

TOP VIEW 

OF PUMP 

THESE 1/8" LINES CONNECT 

TO THE CAP END OF THE 

CYLINDERS. 

ROD END OF CYLINDER 

1/8" HIGH PRESSURE 

HYDRAULIC LINE 

ROD END OF CYLINDER 


HYDRAULIC LINE 

SYNCHRONIZING CYLINDER 

MP65.9438 

29APR97


VERTICAL ARM ROOM EXTENSION WITH SYNCHRONIZING CYLINDER 

ROD 

END 

ROD 

END 


CAP 

END 

CAP 

END 


LINE 

SYNCHRONIZING CYLINDER 

RETURN 

PORT 


PRESSURE 

PORT 


RETRACT 

SOLENOID 

VALVE 

EXTEND 

SOLENOID 

VALVE 

L 


MANIFOLD 

TO PUMP RETURN PORT 

TO PUMP PRESSURE PORT 

MP65.9453 

18MAR97


SINGLE CYLINDER ROOM EXTENSION 

SEE HYDRAULIC 


BI-AXIS VALVE LEVELING 

SYSTEM WITH ROOM 

EXTENSION. 

HYDRAULIC CYLINDER 

SINGLE CYLINDER ROOM EXTENSION 

MP65.9460 

18MAR97


SINGLE CLINDER ROOM EXTENSION SYSTEM 

FIXED TO 

VEHICLE 

FRONT CYLINDER 

ROOM OUT 

ROOM IN 


NOTE: THIS LINE IS PRESSURIZED 

DURING EXTEND AND RETRACT. 

NOTE: THIS LINE IS PRESSURIZED 

WHEN RETRACTING THE ROOM ONLY. 

IT IS VENTED TO THE TANK WHEN 

EXTENDING THE ROOM. 

RETURN 

PORT 

PRESSURE 

PORT 

RETRACT 

CYLINDER 

SOLENOID 

VALVE 

EXTEND CYLINDER 

SOLENOID 

VALVE 


MANIFOLD 

TO PUMP RETURN PORT 

TO PUMP PRESSURE PORT 

MP65.9468 

01MAY97

EXTEND 

LEFT 

ON 

EXTEND 

FRONT 

EXTEND 

REAR 

ON 

OFF 

NOT IN 

PARK/ 

BRAKE 

EXTEND 

RIGHT 

OPERATE 

STORE 

FRONT 

FUSE 

5 AMP 

STORE 

REAR 

OPERATE 




ELECTRICAL CONNECTION DIAGRAM 

210 SERIES BI-AXIS VALVE 

SEE PANEL 

CONNECTION 

DIAGRAM 


MASTER WARNING 

LIGHT/BUZZER 


(+12) - (PURPLE) 6121 

THIS WIRE IS NOT USED 

WITH ALL SYSTEMS 

CAUTION! 

TO BRAKE LIGHT 

ON DASH (LABELED) - 9001 

TO PARK BRAKE SWITCH 

(LABELED) - 9000 

(BROWN) 

7699 

LF 

TO +12 ACC. 

FUSE 15 AMP 

MAX. - 

(RED) 6120 

(BLUE) 9000 

RF 

B A 

B A 

(WHITE) 6230 

(GRAY) 2000 

(ORANGE) 

1000 

WARNING 

SWITCH 

WARNING 

SWITCH 

(WHITE) 6230 

SENSING 

UNIT 

SEE PUMP RELAY 


NOTE: THE FOUR DIGIT WIRE NUMBER 

SUPERSEDES ANY AND ALL WIRE COLORS. 

(WHITE) 

6230 

(BLACK) 

3000 

LR 

A 

B 

(GREEN) 4000 

(WHITE) 

6230 

B A 

RR 

WARNING 

SWITCH 

DO NOT REVERSE WIRE 

COLORS TO A & B ON ANY 

PACKARD CONNECTORS 

WARNING 

SWITCH 

MP85.2010 

22FEB02


210 SERIES PANEL CONNECTIONS 

SENSING UNIT CONNECTIONS 

TO SENSING UNIT 

FROM VALVE 

SEE DETAIL A 

NO CONNECTION 

WHITE 

RED 

GREEN 

DETAIL A 

BLACK 

YELLOW 

PUMP AND WARNING SWITCH CONNECTIONS 

PUMP/WARNING 

SWITCH HARNESS 

FROM 

VALVE 

(WIRE #1) PARK BRAKE - 9000 

GROUND - (WHITE) 6230 

+12V - (RED) 6120 

PUMP RELAY POWER - (BLUE) 6820 

PUMP RELAY CONTROL - (BLACK) 8600 

(WIRE #4) LEFT FRONT 

WARNING SWITCH - 1000 

DETAIL B 

SEE DETAIL B 

(WIRE #2) MASTER WARNING +12 - 6121 

(WIRE #3) MASTER WARNING 

CONTROL - 7699 

NO CONNECTION 

WIRE SIDE OF CONNECTOR SHOWN 

(WIRE #7) LEFT REAR 


(WIRE #6) RIGHT REAR 


(WIRE #5) RIGHT FRONT 


MP85.2017 

22FEB02

(RED) 

6120 

MP85.2020 

05APR01 

ON 

LIGHT PANEL 

CR1 

CR1 

CR1-1 

NOT IN 

PARK 

CR1-2 

RED 

GRN 

BLK 

YLW 

WHT 

(BLUE) 9000 

5A 

12V ACC. 

(BLUE) 6820 (BLACK) 8600 

PUMP 

WHITE RELAY 

(BROWN) 7699 

(PURPLE) 6121 

LR - (GREEN) 4000 

LF - (ORANGE) 1000 

RF - (GRAY) 2000 

RR - (BLACK) 3000 

REAR 

RS 

FRONT 

LS 

GND 

(WHITE) 6230 

TO PARK BRAKE LIGHT 

ON DASH 

NEGATIVE 

PARK BRAKE 

POSITIVE 

PARK BRAKE 

SENSING 

UNIT 

+12V 

VALVE SW. 

WARNING 

SWITCHES 



MASTER WARN 

LIGHT 

ELECTRICAL SCHEMATIC 

LIGHT PANEL 

210 SERIES LEVELING SYSTEM W/KICK-DOWN JACKS


ROOM EXTENSION SYSTEM 

PANEL CONNECTION 

NOTE: FOR VEHICLES WITH MORE THAN ONE ROOM EXTENSION, EACH 

ROOM EXTENSION WILL HAVE A SEPARATE OPERATOR’S PANEL 

AND ROOM EXTENSION HARNESS. 


OPERATOR’S PANEL 

ROOM 

CONTROL 

SWITCH 

(REAR VIEW) 

KEY 

SWITCH 

WHITE 

12 

11 

13 

11 12 

13 

24 25 

26 

25 

24 

26 

12 

13 11 

25 

26 24 

24 

WHITE 

BLACK 

+12 FROM 

11-BLACK 

PUMP RELAY - 

(RED) 6810 * 

25+26 - (GRAY) 8601 

13 - (BLACK) 5100 

12 - (YELLOW) 5000 

TO GROUND 

STUD - 

(WHITE) 6230 

DETAIL A 


HARNESS 

SEE CONNECTION DIAGRAM 

GROUNDING AND MANIFOLD WIRING 

AND 

CONNECTION DIAGRAM PUMP 

RELAY WIRING 

NOTE: THE (4) DIGIT WIRE NUMBER 


* THE (RED) 6810 WIRE SHOULD BE CONNECTED 

TO THE SWITCHED SIDE OF THE RELAY. 

SEE THE PUMP RELAY WIRING DIAGRAM. 

MP85.9432 

15JAN99

ELECTRICAL SCHEMATIC 

HYDRAULIC ROOM EXTENSION SYSTEM 

WITH 210 LEVELING SYSTEM 

PUMP RELAY 

CONTACTS 

M 

PUMP/MANIFOLD 

ASSEMBLY 

15 AMP 

(BLUE) 6820 

PUMP 

RELAY 

(GRAY) 8601 

(BLACK) 5100 

(RED) 6810 

RETRACT 

(YELLOW) 5000 

EXTEND 

(WHITE) 

6245 

WHITE 

ROOM 

EXTENSION 

WIRING 

HARNESS 

STAINLESS STEEL 

GROUND STUD 

(RED) 6810 

PUMP 

(WHITE) 6230 

EXTEND 

RETRACT 

(BLACK) 

5100 

(GRAY) 

8601 

(BLUE) 6820 

(YELLOW) 5000 

+12 FROM 

LEVELING SYSTEM 

CONTROL PANEL 


SUPERSEDES ANY AND ALL WIRE 

COLORS. 

WHITE 

KEY 

SWITCH 

BLACK 

BLACK 

WHITE 

ROOM OPERATOR’S 

PANEL 

ROOM 

CONTROL 

SWITCH 

MP85.9441 

12MAR99


BI-AXIS VALVE WITH ROOM EXTENSION 

PUMP RELAY 

BATTERY 

FUSE 

15 AMP 

+ 

- 

GROUND 

* FUSE 

(BLUE) 6820 

(GRAY) 8601 

(BLACK) 8600 

(RED) 6810 

SEE ROOM EXTENSION 

MANIFOLD WIRING 

DIAGRAM 

WHITE 

SEE GROUNDING 

ELECTRICAL 

CONNECTION 

DIAGRAM 

(WHITE) 6230 

FUSE 10 AMP 


HARNESS 

LEVELING 

SYSTEM 

HARNESS 

PUMP MUST BE MOUNTED SOLIDLY TO FRAME. SOME PUMPS HAVE 

A GROUND CABLE THAT IS TO BE ATTACHED TO THE GROUND STUD. 

* FUSE MAY BE REQUIRED - CHECK APPLICABLE CODE 

NOTE: THE (4) DIGIT WIRE NUMBER SUPERSEDES 

ANY AND ALL WIRE COLORS. 

MP85.9462 

21JAN99

A 

A 

A 

A 


BI-AXIS VALVE WITH ROOM EXTENSION 

GROUNDING AND MANIFOLD WIRING 

WHEN POWER UNIT IS MOUNTED TO VEHICLE 

FRAME VIA WELDED CHANNEL, CONNECT 

GROUND CABLE STRAP TO EITHER PUMP 

MOUNTING BOLT POSITION AS SHOWN. A 

3/8" INTERNAL STAR LOCKWASHER MUST BE 

USED BETWEEN PUMP CHANNEL/GROUNDING 

STUD, GROUNDING STUD/GROUND CABLE 

STRAP TERMINAL AND BETWEEN GROUND 

WIRE TERMINALS/NUT. 

LEVELING SYSTEM 

HARNESS 

GROUNDING 

+ 



COLORS. 

GROUND CABLE 

STRAP (NOT USED 

ON SOME PUMPS) 

PUMP MOUNTING 

PUMP MOUNTING CHANNEL 

3/8" INTERNAL STAR 

LOCKWASHER (3 USED) 

GROUNDING STUD 

TO ROOM EXTENSION 

SOLENOID VALVES 


CONNECTION 

DIAGRAM 

(GRAY) 8601 (RED) 6810 

(WHITE) 6230 

(BLUE) 6820 

(WHITE) 6230 

(WHITE) 6245 

B 

B 

(BLACK) 

8600 

(WHITE) 6245 


CONNECTION 

DIAGRAM 

10 AMP FUSE 

3/8-16 NUT 


HARNESS 



COLORS. 

ROOM EXTENSION RETRACT 

SOLENOID VALVE (1R) 

ROOM EXTENSION MANIFOLD 

1R 

1E 

ROOM EXTENSION EXTEND 

SOLENOID VALVE (1E) 


CONNECTION 

DIAGRAM 

B 

NOTE: WIRE SETS 

ARE LABELED FOR 

EACH SOLENOID. 

(GRAY) 8601 (RED) 6810 

WHITE WIRES TO 

GROUND STUD 

(YELLOW) 5000 

(BLACK) 5100 

B 

(WHITE) 6245 

(WHITE) 6245 


HARNESS 

SEE ABOVE 

GROUNDING 

DIAGRAM 

VIEW FROM PUMP END 

MP85.9483 

21JAN99

+ 

MASTER LIGHT/BUZZER CONNECTION DIAGRAM 

MANUAL LEVELING SYSTEMS 

A MASTER WARNING INDICATOR SHOULD ALWAYS BE USED. WHEN THE LEVELING SYSTEM HAS STRAIGHT- 

ACTING JACKS A WARNING BUZZER MUST BE USED. 

WHEN ONLY A RED MASTER WARNING LIGHT IS USED THE 12+ POWER FOR THE LIGHT COMES THROUGH THE 

CONTROL PANEL. (SEE FIGURE 1 BELOW.) WHEN BOTH A RED LIGHT AND WARNING BUZZER ARE USED THE 

+12 POWER FOR BOTH INDICATORS IS SUPPLIED BY THE IGNITION SWITCH. THE POWER MUST COME FROM 

THE "ON" SIDE OF THE IGNITION SWITCH, NOT THE "ACC" SIDE. (SEE FIGURE 2 BELOW) 

NOTE: BY SUPPLYING IGNITION POWER TO THE WARNING BUZZER AND LIGHT, AND "ACC" POWER TO THE CONTROL 

PANEL, THE SYSTEM MAY BE OPERATED IN ACCESSORY WITHOUT THE BUZZER SOUNDING. THE NEGATIVE SIGNAL 

FOR THE WARNING INDICATORS MUST ALWAYS COME FROM THE CONTROL PANEL. 

CAUTION: THE PURPLE WIRE IN THE MASTER WARNING LIGHT HARNESS IS HOT WHENEVER THE IGNITION 

IS "ON" OR IN "ACC". THE PURPLE WIRE MUST BE REMOVED FROM THE HARNESS WHEN USING DIRECT IGNITION 

VOLTAGE FOR THE MASTER WARNING INDICATORS. 

NOTE: THE (4) DIGIT WIRE NUMBER SUPERSEDES ANY AND ALL WIRE COLORS. 

WARNING LIGHT WIRES ARE INCLUDED 

IN 9 OR 11 PIN MTA PLUG 

+ 

- 

+12 - (PURPLE) 6121 

CONTROL WIRE - (BROWN) 7699 

FIGURE 1 

SEE PANEL 

CONNECTION 

DIAGRAM 

CONNECT THIS END 

TO IGNITION "ON" POWER. 

5-15 AMP FUSE 

PIGTAIL 

W/ DIODE AND IN 

LINE FUSE HOLDER 

SEE PANEL 

CONNECTION 

DIAGRAM 

BUZZER 

6111 

JACKS DOWN LIGHT 

INCLUDED IN 

HARDWARE KIT. 

_ 

NOTE: DO NOT USE 

(PURPLE) WIRE - 6121 

REMOVE (PURPLE) WIRE - 6121 

FROM HARNESS. 

NOTE: SPLICE (BROWN) WIRE - 7699 

FROM HWH LIGHT PLATE TO 

(BROWN) - 7699 PIGTAIL 

WITH BUTT CONNECTOR. 

PIGTAIL 

PROVIDED - (BROWN) 7699 

FIGURE 2 

MP85.9999 

13JAN99

ML13527 - HWH Corporation

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?