operators_manual

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
V
ehicles 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
premature 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 author-
ized dealer or repair facility to have
ride height and pinion angle reset us-
ing the proper equipment and techni-
que. Do this as soon as possible to
avoid potential driveline damage.
NOTE
Suitable wheel chocks are at a mini-
mum an 18-inch (46 cm) long 4x4.
1. Park the vehicle, engage the
parking brakes and clock the
wheels.
2.
Locate the air suspension ride
height valve.
3. Ensure that the tractor is fully laden
during this procedure. Do not use
these procedures on a vehicle that
is not laden (bobtail).
4.
Ensure the air supply and delivery
plumbing of the height control valve
is consistent with the following
illustrations.
5. Loosen the fasteners mounting the
height control valve to its bracket.
6. Rotate the valve either clockwise or
counterclockwise until air pressure
in the air springs provides the ride
height specified for that
DRIVING - Axle and Suspension
128 Y53-6096-1C1 (09/20)
4