operators_manual

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 pri-
or 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
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 limits 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 park-
ing brakes are applied.
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-
DRIVING - Axle and Suspension
Y53-6047-2HEN (03/18) 161
4