operators_manual

terrain and preparing to drive on an
improved surface.
When you go from rough terrain to highway
driving, shift the axle to the HIGH range
following this procedure:
1. Be sure the differential is
UNLOCKED.
2. Maintain your vehicle speed
(accelerator depressed) and move
the Range Selector lever to HIGH.
3. Keep driving with the accelerator
depressed until you want the axle
to shift.
4. To make the axle shift, release the
accelerator until the axle shifts. You
are now in the HIGH axle range for
highway speeds. Shift the
transmission normally to reach
your desired cruising speed.
How to Operate Two Speed Axle -
High to Low
These steps should be used if operating a
2 speed axle in HIGH range on improved
roads and preparing to drive on rough
terrain.
When you go from highway driving to
rough terrain, shift the axle to the LOW
range following this procedure:
1. Maintain your vehicle speed
(accelerator depressed) and move
the Range Selector lever to LOW.
2. Keep driving with the accelerator
depressed until you want the axle
to downshift.
3. To make the axle downshift,
release and depress the
accelerator quickly to increase the
engine rpm. The axle will shift to
LOW range.
4. You are now in the LOW axle range
for rough terrain and heavy loads.
Shift the transmission normally to
maintain the desired speed.
What is an Auxiliary Axle
Adjustable auxiliary axles (commonly
known as Pusher or Tag axles) can add to
the productivity of the vehicle by increasing
the load capabilities of the vehicle when
they are in the deployed (down) position.
There are different configurations of axles
with different functionality (liftable versus
steerable). Without the extra axle, the
excessive weight can reduce the service
life of vehicle components such as, but not
limited to, the frame rail, axles, suspension
and brakes.
Operation of the auxiliary axles includes
the proper maintenance of the system and
calibration of its controls. Operating the
auxiliary axles will also require a firm
understanding of the Gross Axle Weight
Rating (GAWR) and the load that is being
carried.
The vehicle will have switches on the dash
to control the position of the auxiliary axles.
In certain situations, however, the system
will override the controls to protect the axle
system. Replace with new text: For Self
Steering Lift Axles, the axle will raise when
the park brakes are applied or if the vehicle
is placed in reverse. For Non-Steer Lift
Axles, the axle will only automatically raise
if the park brakes are applied and there are
no park brakes on the lift axle. Non-Steer
Lift Axles do not automatically raise when
the vehicle is placed in reverse.
Operating the auxiliary liftable axles must
be performed in a manner that does not
exceed the axle creep rating. Axle creep
ratings are weight and speed limits that are
allowed while the vehicle is fully loaded (in
excess of the vehicle’s standard GAWR)
DRIVING - Axle and Suspension
158 Y53-6047-2HEN (03/18)
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