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Troubleshooting
18. Troubleshooting
PROBLEM
POSSIBLE CAUSE
All air springs are flat
Insufficient air pressure in
the vehicle air system
Air leakage from the
suspension air system or the
air brake system
Air spring(s) deflate
Air leakage from the
rapidly when vehicle
suspension air system
is parked
Ride height too high
Height control valve
or too low
out of adjustment
Air spring(s) ruptured
Tires, rims, chains or other
objects are rubbing against
the air spring
Air spring(s) fail
Continual or repeated over-
extension of the air spring(s)
Air spring(s) worn out
Axle stop NOT installed or
installed incorrectly
Air spring(s) fail to
Restricted air line(s)
fully deflate when all
between the height
weight is removed
control valve and
from the suspension
the air spring(s)
Shock absorber(s) fail
Elongated eyes/over-extension Inspect for mislocated shock brackets and installation of incorrect shocks.
Excessive tire wear
Axles misaligned
Worn pivot or axle bushings
40
SOLUTION
Check the air pressure gauge on instrument panel. If air pressure is low, run
the engine until a minimum pressure of 70 psig (4.83 bars) is indicated on the
gauge. If air pressure is 70 psig (4.83 bars) or above and the air springs are
NOT inflated, the problem may be with the pressure protection valve.
Visually check all air control system fittings by applying a soapy water solution
and checking for bubbles at all air connections and fittings.
Check for loose or damaged fittings, air lines, air springs, brake actuators or
control valve. Tighten loose fittings to stop leakage and/or replace worn or
damaged parts as necessary.
Test for air leakage due to loose fittings between air tank and air suspension
or damaged air lines, air springs or height control valve.
Visually check all air control system fittings by applying a soapy water solution
and checking for bubbles at all air connections and fittings.
Tighten loose fittings to stop leakage and/or replace worn or damaged parts
as necessary.
Re-adjust vehicle ride height using the height control valve. Refer to the height
control valve manufacturer's instructions for adjustment.
Check for proper clearance between the air spring and the tire. If the tire,
rim, chains or other objects contact the inflated air spring when the vehicle is
loaded, a narrower set of tires and rims are necessary to provide clearance for
tires with chains (contact your vehicle manufacturer for recommendations).
Check that the proper shock absorber for your vehicle's application is installed.
Visually inspect for broken or loose shock absorbers or shock absorber
mounting brackets.
Re-connect loose parts and replace any worn or damaged parts as necessary.
Check the adjustment of the height control valves. Refer to the height control
valve manufacturer's instructions for adjustment.
Replace the air spring(s).
NOTE: If the air spring piston contacts the upper bead plate, it may
fracture and leak air. Ensure the axle stops are installed properly and
limit the suspension up travel to specification.
Check for proper axle up travel per vehicle OEM's specifications.
Install axle stops according to the vehicle OEM's recommendations.
Disconnect the height control valve linkage and rotate the actuating lever to
the 45° down position. If the air spring(s) remain inflated, check for pinched
or blocked line(s).
Replace as necessary.
Re-align axles per vehicle manufacturer's recommendations. The ADZ Series
Suspension has alignment collars located on the frame bracket pivot connections
for use in axle alignment.
Re-torque bolts after re-alignment is completed according to the specifications
listed in Section 16.
Re-bush with proper bushing, refer to replacement instructions.
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.
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