operators_manual

obtain the desired load.
Once the desired load or
load range is achieved,
document the pressure-to-
load ratio or setting for
future use.
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.
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 lim-
its may result in citations. Contact your local
commercial weight enforcement office for
limits in your area.
NOTE
Steerable-pusher and/or tag axle(s) will
raise when the transmission is shifted into
reverse or when the parking brakes are ap-
plied.
Air Suspension Ride Height
Information on air suspension and
adjusting the ride height.
Vehicles equipped with rear or front air
suspensions have their ride height and
axle (pinion) angle(s) preset at the factory.
These are precision settings and should
not be altered. Incorrectly adjusted ride
height may result in improper interaxle U-
joint working angles. This can result in pre-
mature driveline wear and driveline
vibration.
If it becomes necessary to reset the ride
height, you may temporarily set it by
following the next procedure. Proper ride
height measurement and values are shown
in the illustration and table below.
CAUTION
Completing this procedure will enable you to
safely reach the nearest authorized dealer
or repair facility to have ride height and pin-
ion angle reset using the proper equipment
and technique. Do this as soon as possible
to avoid potential driveline damage.
NOTE
Suitable wheel chocks are at a minimum an
18-inch (46 cm) long 4x4.
1. Park the vehicle, engage the
parking brakes and clock the
wheels.
DRIVING - Axle and Suspension
120 Y53-6096-1A1 (01/17)
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