HWH 100 Series User manual

HWH LEVER-CONTROLLED
INSTALLATION MANUAL
ML36720/MI35.0010
LEVELING SYSTEM
FOR MOTORHOMES
100 AND 110 SERIES
BEFORE USING. BLOCK FRAME AND TIRES SECURELY
LR
BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE.
STORE
EXTEND
LF RF
CORPORATION
HWH
R
RR
CAUTION! UNDERSTAND OPERATOR’S MANUAL
RR
RR
LEVELING
UNDERSTAND OPERATOR’S MANUAL BEFORE USING.
REMOVING TIRES OR CRAWLING UNDER VEHICLE.
BLOCK FRAME AND TIRES SECURELY BEFORE
CAUTION!
HYDRAULIC
5AMP
FUSE
LR
LR
WARNING
H
CORPORATION
LF
H
LF
W
LEVEL
RF
R
RF
OFF
LEVEL
RF
RF
UNDERSTAND OPERATOR’S MANUAL BEFORE
TIRES OR CRAWLING UNDER VEHICLE.
USING. BLOCK FRAME AND TIRES BEFORE REMOVING
HWH HYDRAULIC LEVELING
CAUTION!
EXTEND
WARNING
LEVELING
STORE
LR
LR
LF
LF
5 AMP
FUSE
OFF
RR
RR
LEVEL
100 SERIES
110 SERIES
24OCT05
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
CORPORATION
W
HH
R

HWH HYDRAULIC LEVELING JACKS
MI35.0505
21JUN95
INSTALLATION MANUAL
ON MOTOR HOMES
THE FOLLOWING INSTALLATION INFORMATION IS OFFERED AS SUGGESTIONS ONLY. VARIATIONS IN VEHICLE
DESIGN, CHASSIS, SUSPENSIONS,TIRES AND COACH WEIGHTS MAKE IT IMPOSSIBLE TO ANTICIPATE AND ADDRESS
ALL INSTALLATION PROBLEMS AND POSSIBILITIES. SOME VEHICLE BUILDERS OR CHASSIS BUILDERS MAY USE
PRACTICES DIFFERENT FROM THOSE IN THIS MANUAL. CONSULT HWH CORPORATION OR THE VEHICLE BUILDER
FOR INFORMATION CONCERNING CORRECT SYSTEM CAPACITY AND TYPE FOR THE VEHICLE, INSTALLATION
QUESTIONS, AND INSTALLATION OF OTHER HWH EQUIPMENT.
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 UNDERSTAND-
ING OF THE LEVELING SYSTEM’S HYDRAULICS AND ELECTRONICS IS REQUIRED.
damages or injuries resulting from the
NOTE - HWH Corporation assumes no liability for
installation of this product.
CAUTION !
READ THE ENTIRE INSTALLATION PROCEDURE BEFORE STARTING INSTALLATION.
BLOCK FRAME AND TIRES 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.
DO NOT TURN ON POWER UNTIL INSTALLATION IS COMPLETE.
WHEN ROUTING HYDRAULIC HOSES AND WIRES, BE SURE THEY ARE NOT EXPOSED TO ENGINE EXHAUST OR
ANY HIGH TEMPERATURE COMPONENTS OF THE VEHICLE.
KICKDOWN 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 THE SKIN
CAUSING INJURY OR DEATH.
SAFETY GLASSES ARE TO BE WORN TO PROTECT EYES FROM DIRT, METAL CHIPS, OIL LEAKS, ETC. FOLLOW
ALL OTHER APPLICABLE SHOP SAFETY PRACTICES.
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 THE JACKS.

PRE-INSTALLATION CHECKS
MI35.1005
23AUG95
THESE ARE ITEMS THE INSTALLER SHOULD CHECK BEFORE STARTING THE INSTALLATION:
Do the jacks have the proper capacity for the axle weights of the vehicle?
Do the jacks have the proper stroke for the mounting heights available?
Does the pump have the proper reservoir capacity for the jacks being used?
Are acceptable mounting locations available for the jacks and other system components?
Will the mounting brackets or jacks interfere with any vehicle components or structure?
If the vehicle is equipped with a full air-bag suspension an air dump system must be used
Vehicles with supplemental air bags or suspensions such as JET AIR do not
Are all components necessary for the installation, including mounting brackets, hardware kits,
Does the vehicle need exhaust work done before the jacks are installed?
Does the vehicle have a good set of batteries that are fully charged?
IF THERE ARE ANY PROBLEMS WITH ANY OF THE ABOVE ITEMS, CONTACT HWH CORPORATION BEFORE STARTING
THE INSTALLATION
for proper leveling.
have to dump the air from the bags.
hoses, etc. present?
PART I
NOTE :
1.)
2.)
3.)
4.)
5.)
6.)
7.)
8.)
9.)
NOTE: Do not use kickdown style jacks and straight acting jacks on the same vehicle.

PART II
MI35.1505
11JAN96
LOCATING THE JACKS
mounting bracket for the flanges of the frame rail, is important.
widest possibe pattern. Always bolt at the top and bottom of the
frame rail whether using mounting brackets, or bolting straight
acting jacks directly to the frame rail.
HWH Corporation does not suggest welding brackets or
straight acting jacks to the frame rails. Do NOT weld kick down
jacks to the mounting brackets or directly to the frame rail.
(See Section B-WELDING) If it is necessary to modify the tail-
will reduce stress in the vehicle and leveling system. When a
tag axle is used the jacks should be mounted between the drive
axle and the tag axle. Mounting the front jacks in front of the
ation or the coach manufacturer before mounting the front jacks
in front of the front axle.
up towards the rear of the vehicle when retracted. Mounting
gested. Mounting jacks that will fold toward the front as in FIG-
URE 3 is unacceptable.
3. JACK MOUNTING HEIGHT:
ing heights or locations refer to the Clearance and Mounting
Dimensions Charts. Combining these dimensions and in-
formation supplied on the "JACK BRACKET" sheets (See
"BRACKETS"-HWH Service Manual) will make it possible to
figure proper mounting heights and locations before starting
the installation. In most cases these mounting heights will
provide clearance on uneven terrain and permit the placement
of a pad under the jacks when operating on soft ground or
asphalt. (Pads are available from HWH Corporation)
shown on the Dimension Charts apply to vehicles with a full
load of fuel, water and equipment. When empty add 1" to
these dimensions. Also take into consideration that new ve-
hicles can settle down 3/4" or more during the first year or
initial 10,000 miles.
suggests using straight acting jacks on vehicles with full air
bag suspension. The vehicle should be at the proper ride
height when determining the proper mounting heights for
the jacks. If kick down style jacks are used, add 2 inches to
the suggested jack mounting heights.
CAUTION: VEHICLE WILL RAPIDLY DROP SEV-
ERAL INCHES IF AIR BAGS DEFLATE.
DEFLATE AIR BAGS BEFORE WORK-
ING UNDER THE VEHICLE.
4. DEFLATING AIR BAGS:
the vehicle’s frame must be securely blocked. The air can
be released by disconnecting the air line between the height
control valve and the air bag. Usually the fitting at the height
control valve is easiest to get to. (See the SUSPENSION AIR
DUMP DIAGRAM)
IMPORTANT:
quickly. Make sure there is adequate clearance to work under
the coach.
SWING TO REAR
IDEAL
FIGURE 1 FIGURE 2
SWING TO REAR
NOT SUGGESTED FIGURE 3
SWING FORWARD
UNACCEPTABLE FIGURE 4
SWING SIDEWAYS
NOT SUGGESTED
2. MOUNTING ARRANGEMENT:
tion for the jacks is important for the proper functioning of the
When the air is released the bags will deflate
pipe, have the owner take the vehicle to a professional muffler
shop for proper procedure before starting installation.
Most brackets are designed with specific bolt hole arrangements.
Use of all holes, especially holes used for the fingers of the
possible behind the front and rear axles. (See FIGURE 1) This
axle is not suggested. (See FIGURE 2) Contact HWH Corpor-
Vehicles with spring suspension: The ground clearance
Vehicles with full air bag suspensions:
JACK INSTALLATION
1. MOUNTING BRACKETS: HWH Corporation has bolt-on
mounting brackets available for many different applications.
(See "BRACKETS"-HWH Service Manual) Most of the brack-
ets are designed to fit a specific chassis in a specific location.
Slight modification of these brackets is acceptable but HWH
Corporation should be contacted when modifying or changing
the mounting locations of these brackets. The kick down brack-
ets are designed for use with 6000# and 9000# jacks. Many
vehicles requiring 16000# jacks are equipped with mounting
brackets for these jacks. Contact HWH Corporation for mount-
The correct mounting loca-
When figuring proper mount-
Before deflating the air bags
When using brackets with multiple sets of bolt holes, use the
the jacks in other positions as shown in FIGURE 4 is not sug-
ing information when needed.
HWH Corporation
leveling system. The jacks should be mounted as close as
Kick down style jacks must be mounted so that they swing

PART II
MI35.1510
08FEB96
4. MOUNTING LOCATIONS
JACK INSTALLATION
: Refer to the CLEARANCE AND
MOUNTING DIMENSIONS CHARTS for specific measure-
ments.
Some general mounting location suggestions are:
2.) Do not mount rear jacks on frame extensions.
3.) Jacks should be mounted near frame cross members.
4.) When frame cross members are not close the jack brackets
should be tied together with a cross member.
5.) Front or rear jacks may be staggered several inches to ac-
commodate vehicle equipment and compartments.
6.) Front jacks and mounting brackets must be mounted so
they do not interfere with suspension components when re-
tracted or extended.
IMPORTANT: Clearance MUST be provided for kick down
front of vehicles with a raised rail chassis such as Spartans
must be tied together. If using straight acting jacks, it is sug-
Be sure jacks, jack mountings, or mounting brackets do not
interfere with any moving components on the vehicle such as
axles, springs, air bags, steering linkage, etc. Kick down jacks
may need to be adjusted to allow full extension of the jack in
the horizontal position.
HWH Corporation assumes no liability for damages to the
vehicle or jack resulting from jack extension in the horizon-
tal position.
Jacks must NOT be exposed to high temperatures such as
exhaust pipes. If exhaust pipes need to be moved, this should
be done before installing the leveling system. Heat shields
supplied with HWH brackets should be applied to both sides.
After-market exhaust systems may be added at a later date
exposing jacks to high temperatures.
NOTE:
7.) Front jacks and mounting brackets must be mounted so
they do not interfere with tires when turned stop to stop.
gested the front jacks on all installations be tied together when
possible.
1.) Rear jacks should always be mounted behind the drive axle.
When using straight acting jacks, the rear jacks on all
installations must be tied together. Straight acting jacks on the
jacks to extend fully in the horizontal position to prevent se-
rious damage to the vehicle.

MI35.1515
05SEP96
CLEARANCE AND MOUNTING DIMENSION CHART
JACK RETRACTED
DIMENSIONS
A B C
EXTENDED
DIMENSIONS
FEDIHGJK
STROKE MOUNTING
WIDTH MOUNTING BOLT PATTERN
6000#
SHORT 12.5" 4.5" 12.0" MIN 14.0"
MAX
16.0"
19.0" MIN 2.0"
MAX
4.0"
7.0" 6.5" 1.5" 4.5"
6000#
TALL
19.5"
9000#
SHORT
9000#
TALL
16000#
14.0" 22.0"
14.5" 23.0"
15.5" 24.5"
18.0" 26.0"
4.5" 13.5"
6.5" 13.5"
6.5" 14.5"
7.0" 16.75"
MIN
15.5"
MAX
17.5"
21.5" MIN 2.0"
MAX
4.0"
MIN
16.5"
MAX
18.0"
22.0" MIN 3.0"
MAX
4.5"
MIN
17.5"
MAX
19.0"
23.5" MIN 3.0"
MAX
4.5"
MIN
19.75"
MAX
21.25"
24.75" MIN 3.0"
MAX
4.5"
8.0" 6.5"
8.5" 8.5"
9.0" 8.5"
8.0" 12.5"
1.5" 4.5"
1.5" 4.5"
1.5" 4.5"
4.0" 4.0"
Dimension E is the suggested mounting height.
Dimension G is the suggested ground clearance when the jack is vertical but not extended.
* If using kick - down jacks on vehicles with full airbag suspensions, add 2 inches to this dimension.
K
J
D
E
F
G
I
A
B
C
KICK - DOWN JACKS
SIDE VIEW TOP VIEW
DIMENSION "I" INCLUDES SPRINGS.
GROUND
LINE
PART II
H

MI35.1520
25AUG95
CLEARANCE AND MOUNTING DIMENSION CHART
JACK MOUNTING WIDTH
A B
GROUND
CLEARANCE E
STROKE RETRACTED
HEIGHT BRACKET
HEIGHT
AP0468**
FORD OSKOSH-X 8.0" 19.5"
A-P1197**
6000# X 13"
AP1152
6000# X 16"
9000# x 13"
9.5"
12.0"
STRAIGHT ACTING JACKS
FRONT VIEW SIDE VIEW
GROUND
LINE
TOP
CLEARANCE
FGH
CALL HWH CORPORATION
AP2025
CHEVY P-30 FRONT
AP2026
FRONT
AP10466**
CHEVY & FORD
REAR ONLY
AP9551**
AP0154
9000# x 16"
AP9552**
12000# X 13"
AP9809
12000# X 16"
AP9553**
16000# X 13"
AP9823
16000# X 16"
8.0"
9.4"
4.9"
6.0"
6.0"
4.9"
4.9"
8.0"
9.4" 6.0"
9.4" 6.0"
9.4" 6.0"
7.0"
12.0" 7.0"
8.0" MIN
10.0" MAX
8.0" MIN
10.0" MAX
8.0" MIN
10.0" MAX
8.0" MIN
10.0" MAX
8.0" MIN
10.0" MAX
8.0" MIN
10.0" MAX
8.0" MIN
10.0" MAX
8.0" MIN
10.0" MAX
8.0" MIN
10.0" MAX
13.0"
13.0"
13.0"
13.0"
13.0"
13.0"
16.0"
16.0"
16.0"
16.0"
22.5"
22.5"
20.0"
21.7"
25.8"
21.9"
25.9
22.0"
28.5"
21.0"
23.5"
17.0"
17.0"
21.0"
17.0"
17.3"
17.5"
17.5"
14.5"
0.0"
0.0"
1.6"
0.8"
0.0"
0.0"
0.0"
0.5"
0.0"
0.5"
C *
A
C
BH
G
F
E
PART II
* Take into account clearance for other coach equipment when determining mounting heights.
** When mounting 13" stroke jacks on coaches with spring suspensions, using 8.0" of ground clearance.
8.0" MIN
10.0" MAX

JACK INSTALLATION
MI35.1525
06JAN96
WELDING
1. G.M.
Disconnect both battery cables. ALWAYS DISCONNECT
THE GROUND CABLE FIRST.
Disconnect computer module wiring.
Attach the welding ground to the part to be welded.
Do not use suspension components as ground points.
Keep welding cables away from electrical systems.
2. FORD
Disconnect both battery cables. ALWAYS DISCONNECT
THE GROUND CABLE FIRST.
Disconnect computer module wiring.
Attach the welding ground to the part to be welded.
Do not use suspension components as ground points.
Keep welding cables away from electrical systems.
3. OSH KOSH
Disconnect both battery cables. ALWAYS DISCONNECT
THE GROUND CABLE FIRST.
Attach the welding ground to the part to be welded.
Do not use suspension components as ground points.
Keep welding cables away from electrical systems.
4. GILLIG
Disconnect both battery cables. ALWAYS DISCONNECT
THE GROUND CABLE FIRST.
Attach the welding ground to the part to be welded.
Do not use suspension components as ground points.
Keep welding cables away from electrical systems.
5. SPARTAN
Disconnect both battery cables. ALWAYS DISCONNECT
THE GROUND CABLE FIRST.
Attach the welding ground to the part to be welded.
Do not use suspension components as ground points.
Keep welding cables away from electrical systems.
HWH Corporation does not suggest welding brackets to the frame rails. However, if any welding is done such as modifying a
jack bracket already mounted, the following precautions should be observed:
Connect welding ground to part being welded. NEVER weld to suspension parts such as spring shackles. NEVER weld across
the bottom flange of the frame rail. Brackets should be located near a cross member. For additional information on the vehicle,
Check with the chassis manufacturer for the most
recent information on welding precautions.
NOTE:
PART II
chassis, brackets, and mounting location, contact the vehicle’s builder, the chassis or suspension supplier, or HWH Corporation.
IMPORTANT: There may be fuel lines or wire inside the frame rail. They should be well protected from the heat caused by weld-
ing. Damage or personal injury could occur. The following are welding precautions for specific chassis manufactures:

COMPONENT INSTALLATION
MI35.2005
15JAN01
If the valve is to be put near the left front tire, care
should be taken to keep it as far outboard and rearward as
possible. If mounted too close to the tire, the valve may be
struck by the tire on rough or bumpy roads or when turning.
2. MOUNTING THE VALVE
1. LOCATING THE VALVE:
valve is normally placed to the left of the driver’s seat. This
location is not vital but is most convenient. If the need arises.
the valve can be put elsewhere such as alongside the couch
or chair. Be sure to check underneath to see that the bottom
of the valve will be accessible. It is not advisable to put the
valve in a compartment or in the dash.
With the Integrated (110 Series) Valve,cut a 5" x 5-3/4" hole
at the desired location.
Before cutting the hole, be sure to check underneath for wir-
ing, structural parts, or other items that may create a pro-
lem. Also be sure to leave enough room to connect all hy-
dralic hoses.
The Separate Valve will be mounted to the bottom of the floor
using four #10 x 3/4" sheet metal screws. (On some vehicles
with thin floors, it may be necessary to shim the valve down,
or the cover plate up.) A minimum of 3/4" of floor thickness
is required. Position one end plate with seal at each end of the
valve body and secure with four #10 x 3/4" sheet-metal screws.
The Separate (100 Series) light panel may be flush mounted
in a flat surface such as the dash or may be surface mounted
on the floor or other convenient locations by using the 1.75"
tall spacer box. When surface mounting the light panel ad-
jacent to the valve be sure to leave enough clearance for the
levers to move the full extent of their travel. Drill a 1" hole be-
neath the light panel to pass the wiring through. Do not mount
the light panel until all wiring is complete. Always leave enough
wire length in the spacer box to allow lifting the panel for re-
pair. Be sure to seal the 1" hole when finished. Never flush
mount a panel in the floor. The panel must always be protect-
ed from dirt and water. When flush mounting the light panel,
a rectangular hole with 45 degree corners matching the back
of the panel will need to be cut in the mounting surface.( See
Template at the end of Part III.) There must be a minimum
clearance of 2" behind the mounting surface to allow for the
panel and the wiring. The Integrated (110 Series) Valve will
drop through the hole from the top. Secure valve and cover
plate at the same time using four #10 x 3/4" Phillips head
screws. If necessary, the sensing unit and harness may be
unplugged to ease installation. This may be done by removing
This may be done by removing the hole cover and
cover plate until sensing unit and harness are plugged in and
hole cover is replaced. Caulk around the underside of the
3. LOCATING AND MOUNTING THE PUMP
4. HYDRAULIC HOSES
Do not attach hoses or wiring to any fuel or
CAUTION:
When connecting hoses and wiring harnesses to the
kickdown jacks always check that the jack can swing from the
horizontal position to a position 45 degrees beyond the ver-
tcal position, without kinking the hose or without tight wires.
The jack must also be able to freely fold back to its stored
position.
Straight Acting Jacks:
wiring harnesses must have enough slack to allow free move-
ment of the jack.
There are different lengths of hoses to be routed to the four
leveling jacks. (Refer to the Hydraulic Hookup Diagram).
Straight Acting Jacks:
and connect it to the hose fitting. 90 degree swivel fittings are
available if needed for clearance.
IMPORTANT:
A LEAKING HOSE CAN POSE A FIRE HAZARD
A KICK DOWN JACK WILL
SWING UP ABRUPTLY WHEN IT IS RELEASED.
EXTREME CAUTION:
PART III
Can pivot several inches. Hoses and
Route the hose to the top of the jacks
On the four lever system, the
: With the Separate (100 Series)
Valve, cut a 4 1/2" x 2 1/4" hole at the desired location.
: Although it is
not always possible, it is desirable to put the pump assembly
under the hood compartment where it is easily accessible for
service or fluid check and refill. The distance of the pump from
the valve is limited by the 7’ hose provided and the battery
cable although a longer hose and cable may be used if available.
: It is important to keep the ends of
the hoses plugged during installation to prevent any dirt from
entering the system. Hoses should be routed away from any
heat emitting items such as engine or exhaust components.
a good location is along the outside of the frame rail. It may
be necessary to build a heat shield and/or adequately insul-
ate the hoses. Care should be taken to avoid sharp edges.
NOTE:
NOTE:
The pump and pump relay should be protected from direct road spray.
NOTE: Do not remove fitting caps until attaching the hose
to the valve.
screws.
valve where the box meets the floor.
unplugging sensing unit and harness. Do not secure valve and
crossmember on front control coaches.
brake lines. Do not run hoses across the transmission
existing hose end, tighten the hose end to snug plus 1/4
tighten the hose end 1/3 turn (2 FLATS). If tightening an
make the hose end snug (finger tight) on the fitting, then
Tightening of hose ends: If tightening a new hose end,
turn (1 FLAT).

PART III
MI35.2010
21JUN95
KICK DOWN JACKS:
A short hose is attached to the
jack at the factory. The hose is clamped to the pivot bracket.
It can be moved to the opposite side of the jack if necessary
to avoid heat sources or other obstacles.
ROLLER
BEARING
9000# KICK DOWN JACK
jack, the hose should go in the upper left-hand corner, over
the pivot area and down the front of the jack. After connect-
ing the hose to the fitting, the hose should be clamped with
a 1/4" bolt to the left side of the pivot bracket. Be sure the
hose is snug against the jack in the retracted (horizontal)
position.
Route the hose around the left
pivot, then across the back side of the cylinder and connect
to the actuator fitting. Attach the hose to the pivot bracket
using a hose clamp. There should be no slack in the hose.
- When connecting the hose to the
COMPONENT INSTALLATION
6000# KICK DOWN JACK- 16000# KICK DOWN JACK-
FIGURE 5
FIGURE 6
FIGURE 7

PART III
MI35.2015
25AUG95
5. WIRING: Refer to the appropriate electrical diagram for
wiring. Any wire or cable in the interior of the coach is to be
protected by fusing. All wire insulation should be rated 125
deg. Celsius (257 deg. F). Check applicable RVIA or other
code for detailed fusing and wiring information. Protecting
all wires and cables by fusing is desirable.
A #2 battery cable is supplied with most systems to connect
the pump to the battery or a battery junction post. If a different
cable is used it must be able to carry 200 amperes. If fusing
is required, use a 200 ampere fuse. The fuse should be placed
near the power source. Never connect a fuse directly to the
battery or place it in the battery box where an electrical spark
can cause the battery to explode. If power is taken directly
from the battery, the fuse should be at least 18" from the bat-
tery. A fuse kit is available from HWH Corporation.
Wiring harnesses supplied are usually adequate for most
installations. Harnesses are loomed at the factory. All con-
nections are plug in type except for pump relay which has
ring terminal connections and the power supply for the panel.
That is a field connection made by the installers.
If lengthening or shortening the harness is necessary it is
suggested that all connections be soldered and protected
with shrink tube. If other connection devices are used they
must be sealed to prevent deteriation of the connection.
Grease-filled weather resistant crimp on butt connectors are
available .
Packard Connectors are marked with A & B for wire
connections. This cannot be mixed up. Maintain correct wire
size and color when altering harnesses.
Master Warning Light/Buzzer connections are done by the
installer. Route all wiring away from all heat sources and pro-
tect against sharp edges. Check that jacks can pivot properly
without cutting or stretching wire harnesses or connections.
All grounding connections are supplied by HWH Corporation
and all grounding should be done at the supplied ground stud.
(Refer to PUMP RELAY AND PANEL CONNECTION DIAGRAM).
Coat all exposed electrical connections (battery cable ends,
pump solenoid terminals, grounds, etc.) with a protective
sealant such as Kraylon 1307.
6. THE MASTER WARNING LIGHT/BUZZER:
Warning Light should be used with all systems. A buzzer must
be used with systems using straight acting jacks.The Master
Warning Light should be mounted in the dash in a location
highly visible to the driver. This light will warn the driver if
any of the jacks are down when the ignition is turned to "ON".
Drill a 1/2" hole at the desired location. Be sure to check for
wires or other devices behind the surface before drilling. When
installing the light itself, make sure the ignition is in the "OFF"
position. With the ignition on +12 can be present at the warn-
ing light.
When using a buzzer, the +12 power should come from the
"ON" side of the ignition switch. The power for the panel should
come from the "ACC" side of the ignition switch. (Refer to the
MASTER LIGHT/BUZZER CONNECTION DIAGRAM).
With all wiring complete, the light plate (100 Series System),
or cover plate (110 Series) may now be mounted.
7. MOUNTING THE SENSING UNIT:
can be mounted above or below the surface as long as the
"This Side Up" sticker (FIGURE 8) is facing up and the "Rear"
arrow is pointing to the rear of the coach. The sensing unit
must be mounted to a solid surface that will not flex. Do NOT
mount the sensing unit near any heat-emitting items. Outside
of the frame rails is preferred. The sensing unit must be at
least 12" away from exhaust pipes or other high temperature
components, and must not be in line of sight from these high
temperature components.
A Master
8. FLUIDS: Use Mercon, Multipurpose or Dextron automatic
transmission fluid. DO NOT USE brake fluid or hydraulic
jack fluid. Use of these fluids can damage seals. The hydraulic
tank should be filled to within 1" from the top.
Air Dump - Optional
The air dump feature is used only on coaches with full air bag
suspension, not on coaches with spring suspensions and air
booster bags.
Most coaches have three height control valves; one for the
right rear air bag, one for the left rear air bag, and one for
the front two air bags, OR one for the two rear bags, one for
left front air bag, and one for the right front air bag.
An air dump solenoid valve must be teed into the air line be-
tween each height control valve and the air bag it controls.
(See the Air Line Connection Diagram).
On the 100 and the 110 Series, the air dump signal is on the
yellow wires coming from the control panel. There is one
connection at the front of the vehicle and one at the rear. A
Tee adaptor is supplied with the control system. This will con-
nect two dump valves to one harness connection at the front
or rear of the vehicle. (Refer to Electrical Connection Diagram
With Suspension Air Dump.)
COMPONENT INSTALLATION
NOTE:
The Level Sensing Unit
SURFACE
MOUNTING
BELOW THE SURFACE MOUNTING
SCREWS (3)
REAR
THIS
SIDE
STICKERS
ON TOP
UP
FIGURE 8
LEVEL SENSING UNIT
SPRINGS (3)

COMPONENT INSTALLATION
MI35.2020
21JUN95
Check list
1. Check all bolts and brackets for tightness.
2. Check that all hoses are securely clamped or tie wrapped.
3. Check that all wires are securely clamped or tie wrapped.
4. Check oil level before operating the system.
5. Check Hydraulic circuit:
a. Hoses are connected to corresponding valves
and jacks.
b. All fittings for tightness.
6. Check Wiring circuits:
a. That color coded wires are hooked properly.
b. All cables are securely fastened.
c. All ground wires are securely fastened to the
ground stud.
PART III

COMPONENT INSTALLATION
MI35.2025
06OCT95
PART III
FLUSH MOUNT DASH PANEL TEMPLATE
DASH LINE INDICATES OUTER BEZEL
* USE ACTUAL BEZEL FOR
POSITIONING MOUNTING HOLES
0.4883
3.610
3.250
3.1240
4.6240
5.110
4.750

START-UP & ADJUSTMENTS
MI35.2505
02JAN96
Do NOT operate system without having the ground
FIGURE 10
16000# JACK
FIGURE 11
SET SCREW
ADJUSTING
HEAVY DUTY
LEVELING
CAP
UNITS
ADJUSTING NUTS
SET SCREWS
FIGURE 9
9000# JACK
LOWER
ADJUSTING
LOW PROFILE
STANDARD &
UNITS
NUT
UPPER
ADJUSTING
NUT
STOP
A. HYDRAULIC START-UP
1. PRIMING PUMP
4-LEVER:
turn the master switch on. Move any lever on the manual
system to the EXTEND postion. The lever must be moved
to the fullest extent of its travel. This should be done in 3-
second intervals until the pump is primed. This can be de-
termined by a lower pitch sound from the pump. Extend the
two front jacks until they bump the ground, then RETRACT and
Check the system for hydraulic leaks.
Check that the correct jacks are operating as each lever is
operated.
Refill hydraulic tank to within 1" of the top after all jacks have
have been operated.
B. JACK ADJUSTMENTS
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 in case the jack extends in the horizontal posi-
tion. The jack must be able to fully extend in the horizontal posi-
tion without interfering with suspension components, tanks,
etc.
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. Each jack
it can be adjusted by loosening the lower actuator nut and
tightening the upper actuator nut. (FIGURE 10) If the jack
provide clearance for objects which may interfere with the
operation of the jack (FIGURE 10). The stop must be adjusted
so that the jack can be fully extended in the horizontal pos-
ition without interfering with suspension components or tanks,
etc.
If the jack stopped short of being vertical,
the jack went beyond vertical, loosen the set screw and turn
the adjusting cap counterclockwise. After each counterclock-
wise adjustment, the weight of the coach must be applied to
the jack to make the adjustment effective. Do NOT adjust cap
more than one turn without cycling the jack (FIGURE 11). The
horizontal stop on the heavy-duty jack is adjusted by adding
washers under the urethane stop.
The horizontal stop can be adjusted up or down in the slot to
loosen the set screw and turn the adjusting cap clockwise. If
wire grounded properly to the chassis.
Consult the respective operator’s manuals for specific operat-
ing instruction for the system being installed.
6000# JACK
PART IV
To prime the pump turn the ignition key on, then
NOTE:
1. 6000# JACKS:
2. 9000# JACKS:
3. 16000# JACKS:
- KICK DOWN JACKS ONLY
If the jack stopped short of being vertical
must be adjusted so it can extend in the horizontal position
without interfering with any suspension components, tanks,
etc.
goes past vertical reverse the process.
refill the tank. Care should be taken not to run the pump
out of fluid as it may damage the pump.
Always make the vertical adjustment first.
If the vertical adjustment is changed at any time, be sure
to check the horizontal adjustment. Vertical adjustment is
changed by adjusting the locknuts on the actuator cable.
(FIGURE 9) If the jack stopped short of vertical, tighten the
locknuts off. If the jack goes past vertical, back the lock-
nuts off. Be sure to adjust each nut the same number of
turns.

PART IV
MI35.2510
03JAN96
C. INDICATOR LIGHT CHECK
1. Extend one jack at a time and check the corresponding lights
4. The master warning light and/or buzzer will come on when
Level the coach by placing a circular bubble level in the center
of the freezer floor or location within the coach that is to be
level. With the coach level, adjust the sensing unit until all
yellow lights are off. This is done by drawing up the corre-
sponding screw if the sensing unit is mounted above the sur-
face. Bump the sensing unit to see that it has settled down in
the level position.
START-UP & ADJUSTMENTS
D. LEVELING SENSING UNIT ADJUSTMENT
to be sure that the wiring is correct and that all lights are
functioning properly.
3. The yellow lights indicate that the corresponding corner
of the coach is low.
any one of the jacks is in the vertical position and the ig-
nition key is in the "ON" position.
After all adjustments are made:
1. Run the system several times.
2. Check the oil level.
3. Check the connections and the adjustements one final
time.
4. Show the vehicle owner the correct operation of the system.
5. Make sure the owner receives an Operator’s Manual Kit.
2. The red light indicates that the corresponding jack is in the
acting jack.
vertical position, or extended approximately 2" if it is a straight