MP24.9733
17JAN17
SECTION II
625/625S SERIES LEVELING SYSTEMS
COMPONENT INSTALLATION
Mounting kick-down style jacks:
BODILY INJURY CAN OCCUR WHEN CONTACT IS MADE WITH A SWING JACK.
JACKS WILL SWING UP ABRUPTLY FROM THE VERTICAL POSITION WHEN RELEASED.
WARNING:
Refer to drawings in the JACK MOUNTING BRACKET CATALOG for frame
placement and mounting dimensions of the different brackets. Pre-punched or drilled and tapped mounting plates are available
when on-site fabricating of a mounting system is required. Minor modification to brackets, such as making a small notch, is
acceptable but HWH Corporation should be contacted if major modification or moving the bracket to a different mounting
location is needed. Punch plates and kick-down brackets listed in the catalog are designed for use with 6000# and 9000#
jacks. If 16,000# kick-down jacks are to be used and an existing mounting bracket on the frame is not available, a mounting
bracket will have to be fabricated. Drilled and tapped mounting plates are available from HWH Corporation.
Refer to figures 1 thru 4 in section I, COMPONENT SELECTION, for typical to unacceptable mounting locations for the jacks.
Kick-down jacks must be mounted so they swing upward to the rear or the vehicle when retracting to the horizontal position.
NEVER MOUNT KICK-DOWN JACKS SO THEY SWING TO THE FRONT OF THE VEHICLE (Figure 4). Swinging jacks to
the side of the vehicle is not suggested. (Figure 3)
Ample clearance behind the jacks must be maintained in case a jack extends before swinging to the vertical position. A
horizontal adjustment is supplied with all kick-down style jacks. Jacks can be adjusted downward slightly to avoid contact with
compartments or any vehicle or chassis equipment such as tanks and suspension components in case the jack extends before
swinging vertical. These adjustments are discussed later in the manual.
Maintaining the correct ground clearance as listed in the "Clearance and Mounting Dimension Chart" for a kick-down jack is
important. This allows for parking on uneven ground and also allows the use of a pad or block under the jack when parked on
soft ground or asphalt. You must also allow for the vehicle to sag when loaded or as the vehicle ages. It is important to follow
the guidelines in the Clearance and Mounting Dimensions Chart for Kick-down Jacks. If the jacks have too much clearance,
1-1/2 and 3 inch spacer kits are available. Each kit will do two jacks.
Typical installation of kick-down mounting brackets does not require welding to the vehicle frame rail. If any welding on the
vehicle frame rail is to be done, the vehicle or chassis manufacturer should be contacted for authorization and procedures
before proceeding. Welding to jack mounting brackets is allowable but all acceptable welding and safety procedures should
be followed. Refer to "WELDING" in SECTION II of COMPONENT INSTALLATION.
IN NO CASE SHOULD A KICK-DOWN
JACK PIVOT BRACKET BE WELDED DIRECTLY TO A FRAME RAIL OR A MOUNTING BRACKET.
Some means of preventing the frame rail from twisting must be provided. Typically, the jack
mounting brackets are mounted near a suspension bracket or a frame rail cross tie.
6,000# and 9,000# kick-down jacks and mounting brackets have slotted mounting holes so the jacks can be rotated slightly.
This allows the jack to be mounted so it swings up and down in line with the vehicle. 16,000# jack mounting holes are not
slotted. The brackets need to be installed as square in line with the vehicle frame as possible.
Mounting brackets and jacks should be bolted using hardware supplied by HWH Corporation. Make sure all bolts are properly
tightened. A minimum of grade 5 bolt should be maintained if substituting for hardware supplied by HWH Corporation. Any
flat and/or lock washers must be used when supplied in hardware kits. Before the installation is complete, all mounting
bolts for the mounting brackets and jacks should be rechecked for tightness.
The kick-down jack will have to pivot to the vertical position to access all mounting bolts. Loosely fasten the two rearward
pivot bracket mounting bolts first. Pull the jack to the vertical position and secure the jack so it cannot swing to the horizontal
position. A small strap or chain works the best. DO NOT jam a wrench or bar between the jack cylinder and pivot bracket.
If the bar slips, the jack will abruptly swing up. When the jack is completely fastened and the mounting bolts properly
tightened, release the retaining strap or chain and allow the jack to pivot to the horizontal position.
Mounting straight-acting style jacks:
The main concerns when mounting straight-acting jacks are the ground
clearance, clearance above the jack to the vehicle floor and making sure the jack is mounted straight up and down with the
vehicle so it does not push forward or backwards as it lifts the vehicle. If a jack cylinder incorporates a straight fitting for the
hose connection, more clearance will be needed to attach the hose. Refer to the Clearance and Mounting Dimensions Chart
Straight-acting Jacks, for typical ground clearance when the jacks are retracted. If the vehicle is equipped with an air
suspension, the vehicle will lower between 2 and 3 inches when the air is dumped from the air bags. Remember to allow for
this when determining mounting heights. Typically, we like the jack to have between 5 and 6 inches of lift. This should be
taken into account when determining mounting heights.
