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Suspension Service Instructions
6. Ride Height Adjustment
Proper suspension ride height should be within ± .25" (6 mm)
of the specified ride height.
NOTE: The specified ride height can be found in the
model number (Example: Model ADZ-123-10,
the ride height is 10").
To check the current ride height of the suspension use the
following steps:
1.
Drive the vehicle forward in a straight line for at least
two (2) vehicle lengths to release any bushing wind up.
2.
With the vehicle unloaded and/or trailer disconnected
on a level surface, chock the front tires to prevent the
vehicle from rolling forward or backward.
3.
Pressurize the air system with a constant supply of air in
excess of 70 psig (4.8 bars) and check that all air springs
properly inflate and raise the suspension to the proper
ride height.
4.
Measure the distance from the bottom of the frame rail
to the ground (Figure 10 - Arrow A).
5.
Measure the distance from the center of the wheel to the
ground (Figure 10 - Arrow B).
6.
Subtract the measurement found in Step 5 from the
measurement found in Step 4 to determine the current
ride height of your suspension.
Example:
The bottom of the frame rail to the
ground measures 30" (762 mm) "A".
The center of the wheel to the ground
measures 20" (508 mm) "B".
A (30") minus B (20") = Ride Height (10.0")
Current suspension ride height = 10.0"
IMPORTANT: If the measured ride height is NOT within
± .25" (6 mm) it MUST be adjusted
using the height control valve. Refer to
the height control valve manufacturer's
instructions for adjustment procedures.
NOTE: If proper ride height is NOT obtained or air springs
DO NOT inflate properly; check the air pressure
and check for proper piping in accordance with
the truck manufacturer's procedures and owner's
manual then repeat above steps. If the proper ride
height still cannot be obtained, contact vehicle
OEM for assistance.
14
Figure 10
XL-PS10452MM-en-US Rev E · 2024-05-23 · Amendments and Errors Reserved · © SAF-HOLLAND, Inc., SAF-HOLLAND, HOLLAND,
SAF,and logos are trademarks of SAF-HOLLAND S.A., SAF-HOLLAND GmbH, and SAF-HOLLAND, Inc.
RIDE HEIGHT
A
B
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