operators_manual

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 miles per hour 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.
CAUTION
A change in tire size on either the aux-
iliary axles or the drive/steer axles can
change the calibration of the auxiliary
axles. If tires are installed with a differ-
ent loaded radius, the calibration pro-
cedure must be repeated. Failure to do
so can cause equipment damage.
Contact your dealer or axle manufacturer
to determine what the creep rating is for
your particular axle(s) and configuration.
Creep ratings are generally limited to the
following:
• Tandem rear axles only
• Straight trucks only
• Maximum spring mount centers per
axle manufacturers specifications
• Maximum tire static loaded radius
(SLR) per axle manufacturers
specifications
Related concepts
Pusher or Tag Suspension
Calibration
Calibrating the suspension is important to
ensure that the correct axle loads meet
DRIVING - Axle and Suspension
160 Y53-6047-2HEN (03/18)
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