operators_manual

NOTE
Axle Creep ratings MUST NOT be exceed-
ed.
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 remaining axles, and could cause
equipment damage.
CAUTION
Do not modify the air system and/or control
functionality on a factory installed auxiliary
axle(s). Modifying the factory operation of
the pusher and/or tag axle(s) will void your
warranty, and can cause equipment dam-
age.
CAUTION
A change in tire size on either the auxiliary
axles or the drive/steer axles can change
the calibration of the auxiliary axles. If tires
are installed with a different loaded radius,
the calibration procedure must be repeated.
Failure to do so can cause equipment dam-
age.
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
See Also
Vehicle Loading on page 24
Pusher or Tag Suspension
Calibration
Calibrating the suspension is important to
ensure that the correct axle loads meet
weight limits and obtain the proper load
distribution.
Perform this procedure at or near a weight
scale. Procedure can be performed while
parked on the weight scale if scale is
available. To obtain the desired axle load
distribution, you must correlate the
suspension air gauge pressure to the
actual axle load by scaling the axle
weight(s) and adjusting the pressure to
obtain the desired load. Once the desired
load or load range is achieved, document
the pressure-to-load ratio or setting for
future use.
NOTE
This procedure must be performed prior to
placing the vehicle into service.
Add: Perform this procedure at or near a
weight scale. Procedure can be performed
while parked on the weight scale if scale is
available.
Setting the
Pressure-
to-Load
Ratio
To obtain the desired axle
load distribution, you must
correlate the suspension
air gauge pressure to the
actual axle load by scaling
the axle weight(s) and
adjusting the pressure to
DRIVING - Axle and Suspension
Y53-6096-1A1 (01/17) 119
4