operators_manual

Axle and Suspension
Differential Lock
The vehicle may be equipped with
switches to lock the either of the rear axle
differentials. Depending on how the vehicle
is specified, a combination of individual
switches may be available that can lock the
interaxle driveline and/or any combination
of the forward rear or rear-rear driving
axles. The interaxle differential switch
allows each axle to turn independently. In
certain situations, engaging the interaxle
differential lock relieves stress on the rear
axles and reduces tire wear. Engaging this
switch will also provide better traction in
slippery or loose gravel conditions.
In the LOCK position, continuous operation
on paved, dry surfaces, put stress on the
axles, and can possibly damage the
internal gears. The switch has a guard to
prevent accidental operation of the switch.
Locking the differentials is typically used
during ice or snow conditions and without
tire chains, unpaved roads that have loose
sand, mud or uneven surfaces. Look
ahead and predict when the differential
needs to be locked. Stop the vehicle and
lock the differentials before approaching.
While using the differential in the locked
position, do not exceed 25 mph (40 km/h).
When disengaging the differential lock,
reduce the throttle to prevent drivetrain
damage.
WARNING
DO NOT put the differential lock in the
LOCK position while the wheels are
spinning freely (slipping), you could
lose control of the vehicle or cause
axle damage. Switch to LOCK only
when the wheels are not spinning.
Failure to comply may result in death,
personal injury, equipment or property
damage.
Dual Range (Two-Speed) Rear Axle
Your vehicle may be equipped with a two-
speed or dual range axle (option). The low
range provides maximum torque for
hauling heavy loads or traveling over rough
terrain. The high range is a faster ratio for
highway speeds and general over-the-road
conditions. A switch on the accessory
switch panel controls the dual range rear
axle. You will notice that the switch has a
guard to protect you from activating it
accidentally. Always park your vehicle with
the range selector in LOW.
Important tips on operating a dual range
axle with inter-axle differential:
• Shift the axle with the inter-axle
differential in the unlocked position
only.
• When you are driving with poor
traction, lock the differential. When
you have the differential locked,
drive with the axle in LOW range
only.
• When you are driving on a surface
with good traction, keep the inter-
axle differential unlocked. You can
drive with the axle in the LOW or
HIGH range.
• Always UNLOCK the inter-axle
differential before shifting the axle
speed range.
DRIVING - Axle and Suspension
170 Y53-6126-1A1 (01/21)
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