MP24.9721
09JUL09
SECTION I
625/625S SERIES LEVELING SYSTEMS
COMPONENT SELECTION
The following chart shows the available capacities for kick-down and straight-acting jacks:
Weight capacity
Kick-down style
Straight-acting style
3,000#
X
4,000#
X
6,000#
X
9,000#
X
12,000#
X
16,000#
X
24,000#
X
X
X
To select the proper components for your application, especially when selecting mounting brackets and/or
jacks, the vehicle must be available for inspection. Ordering system components without first inspecting and
measuring the vehicle for critical component mounting and location information may result in receiving
components that may not work properly for your application.
Refer to the "CLEARANCE AND MOUNTING DIMENSION CHART" in PART I of this manual for information needed to check
available mounting locations for adequate clearance to mount and operate the jacks. Refer to the "Jack Mounting Bracket
Catalog (ML10049)
X
X
located in the HWH Online Installation School for specific information concerning bracket and mounting
dimensions or jack / mounting bracket locations on frames. Information in this catalog is mainly vehicle generic in nature and is
primarily used in aftermarket installations, O.E.M. installations will usually be more vehicle specific. O.E.M.s should contact
Use the combined information from the charts in PART I and the Bracket Catalog to determine a proper mounting
location with adequate mounting and operational clearance before ordering equipment.Remember, operational clearance
includes mounting heights. HWH offers kick-down and straight-acting jacks in different stroke capabilities. Use the charts and
the catalog to determine which stroke jack is needed for your application.
Vehicles with spring suspensions.
The ground clearances listed in the Dimension Charts apply to vehicles with a full
load of fuel, water and equipment. If the vehicle is empty, typically 1 inch should be added to the listed dimensions. Also, if the
vehicle is new, the vehicle may settle down 3/4 of an inch or more in the first year or 10,000 miles.
Vehicles with air suspensions.
Typically, straight-acting jacks are used on vehicles with an air suspension. If the
vehicle is at normal ride height when mounting heights are set, you must remember the chassis will lower between 2 and 3
inches when the suspension air bags are emptied. Ground clearances listed in the Dimensions Charts are typically figured
with the suspension air bags empty. If possible measure the difference between the bottom of the frame and the ground
with the vehicle at normal ride height and with the bags empty. This dimension is how far the vehicle will lower when the air
bags are exhausted. Add this dimension to the suggested ground clearance listed for the jacks in the dimension charts.
Example: A 13" stroke jack is typically mounted with 7 to 9 inches of ground clearance. A vehicle with an air suspension
drops 3 inches from normal ride height when the suspension air bags are emptied. The typical ground clearance for this
installation should be 10 to 12 inches with the vehicle at normal ride height.
The correct mounting location for the jacks is important for the proper functioning of the leveling system and to reduce stress
to the vehicle while leveling. Refer to Figures 1 thru 4 for typical, non-typical, not suggested and unacceptable mounting
configurations. Figures 3 and 4 refer to kick-down style jacks only.
TYPICAL
Figure 1
NON - TYPICAL
Figure 2
NOT SUGGESTED
Figure 3
UNACCEPTABLE
Figure 4
SWING TO REAR
SWING TO REAR
SWING SIDEWAYS
SWING FORWARD
FRAME
EXTENSION
FRAME
EXTENSION
EXTENSION
FRAME
EXTENSION
FRAME
HWH sales or engineering for specific information or drawings.
