Peterbilt 325 2017, Operator'S Manual

Page: 194 / 392

AXLE
General Calibration Guidelines
These instructions are general in
nature. For more specific instructions,
review the pusher or tag suspension
manufacturers maintenance manual or
contact the nearest authorized dealer.
NOTE
Perform this procedure at or near a
weight scale. Procedure can be per-
formed while parked on the weight
scale if scale is available.
1. Park loaded vehicle on level
surface with wheels blocked.
2. Release vehicles spring
brakes. (Do not release for
Liftable/Non-Steerable pusher or
tag axles).
3. Lower the pusher/tag axles with
the axle lift control flip valve. (For
some non-liftable axles, inflate air
suspension).
4. Adjust the amount of load on
each axle by turning the pressure
regulator clockwise to increase
the load or counterclockwise
to decrease the load. (The
suspension manufacturer
may publish pre-established
Pressure-to-Load Ratio Pressure
Settings to assist you in achieving
an estimated ground load).
5. After setting the pressure to obtain
the desired axle load, verify proper
ground loading with the weight
scale.
NOTE
Exceeding local, state or federal
weight limits may result in cita-
tions. Contact your local commercial
weight enforcement office for limits
in your area.
Operation guidelines
NOTE
Steerable-pusher and/or tag axle(s)
will raise when the transmission is
shifted into reverse or when the
parking brakes are applied.
4-54
Y53-6060-1C1 (03/17)
4