operators_manual

This allows maximum traction of the drive
axles to control the vehicle.
Depending on the suspension, various
calibrations may be required. Contact your
authorized dealer or axle/suspension
manufacturer for specific calibration
procedures.
Some suspensions require dump valve
calibration. For example, some dead axles
do not lift, but the air can be dumped out of
them to unload them when empty
. Air
pressure is controlled via an adjustable
regulator. These axles need to be
calibrated for load.
Contact your authorized dealer or axle/
suspension manufacturer for dump valve
calibration procedures.
Axle Creep Rating
Vehicles outfitted with auxiliary axles and
full truck configuration will have an axle
creep rating which defines how much load
is allowed when the vehicle has a full load
and maneuvering the vehicle, at very slow
speeds, with auxiliary axles in the up
position. In these situations, the load
exceeds the gross axle weight rating of the
axles.
Operator's using vehicles equipped with
liftable auxiliary axles must consider creep
ratings when any liftable axle is unloaded
or in the raised position. Liftable auxiliary
axles should only be raised (or unloaded)
to improve maneuverability in an off-road
use or when vehicle is unloaded.
WARNING
NEVER operate the vehicle with more
pressure
in the lift axles than is neces-
sary to carry the load, as determined
by the calibration procedure described.
Failure to do so can result in loss of
traction and stability at the steer and/or
drive axles and can result in increased
braking distance, which could cause
loss of vehicle control resulting in an
accident. Failure to comply may result
in death, personal injury, equipment or
property damage.
NOTE
Axle Creep ratings MUST NOT be ex-
ceeded.
CAUTION
Always lower the axles as soon as
possible
after receiving a load. Never
exceed 5 mph (8 km/h) when driving
with a load with the auxiliary axle(s)
raised/unloaded. Failure to lower the
axle(s) can overload the frame and re-
maining axles, and could cause equip-
ment damage.
CAUTION
DO NOT modify the air system and/or
control
functionality on a factory instal-
led auxiliary axle(s). Modifying the fac-
tory operation of the pusher and/or tag
axle(s) will void your warranty, and can
cause equipment damage.
DRIVING - Axle and Suspension
126 Y53-6096-1C1 (09/20)
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