Regional Haul Model Operator's Manual - Peterbilt Motors Company

OPERATING THE REAR/DRIVE AXLE
wheel track, or if the steering angle sensor is replaced or
the steering wheel is changed or re-centered, the Steering
Angle Sensor must be re-calibrated.
WARNING! If the Steering Angle Sensor is not
re-calibrated, the Yaw Control system will not
function properly, which could result in a loss
of control of your vehicle, death or personal
injury.
Operating the Rear/Drive Axle
STARTING AND OPERATING THE VEHICLE
Interaxle Differential Lock
On vehicles with tandem rear axles, the interaxle differential
allows each axle to turn independently. Differential
action between the tandems relieves stress on the rear
axles and reduces tire wear. The interaxle differential lock
switch allows the operator to LOCK or UNLOCK the differential,
depending on road surface conditions.
When operating normally on paved, dry surfaces, keep
your truck's interaxle differential in the UNLOCK position.
Introduction
This section covers the operation of your Rear/Drive Axle.
These instructions apply to the most common features of
drive axles. Refer to the manufacturer’s instructions for
further information on the operation of your axle.
If your vehicle is equipped with a Rockwell Tractech Nospin
single rear axle, the wheel differential lock feature
automatically engages and disengages. When one wheel
starts to spin on a slippery surface, this rear axle feature
engages to improve traction.
SHIFT AT ANY SPEED EXCEPT
IF A WHEEL IS SPINNING
In the LOCK position, an air operated clutch positively
locks both sets of axles together, providing greater traction
on slippery road surfaces; however, steering around
– 124 – Y53-6033 Regional Haul (R05/10)