Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
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STARTING AND OPERATING THE VEHICLE<br />
OPERATING THE REAR/DRIVE AXLE<br />
Operating the Rear/Drive Axle<br />
Introduction<br />
This section covers the operation of your Rear/Drive Axle.<br />
These instructions apply to the most common features of<br />
drive axles. Refer to the manufacturer’s instructions for<br />
further information on the operation of your axle.<br />
If your vehicle is equipped with a Rockwell Tractech Nospin<br />
single rear axle, the wheel differential lock feature<br />
automatically engages and disengages. When one wheel<br />
starts to spin on a slippery surface, this rear axle feature<br />
engages to improve traction.<br />
Interaxle Differential Lock<br />
On vehicles with tandem rear axles, the interaxle differential<br />
allows each axle to turn independently. Differential<br />
action between the tandems relieves stress on the rear<br />
axles and reduces tire wear. The interaxle differential lock<br />
switch allows the operator to LOCK or UNLOCK the differential,<br />
depending on road surface conditions.<br />
When operating normally on paved, dry surfaces, keep<br />
your truck's interaxle differential in the UNLOCK position.<br />
SHIFT AT ANY SPEED EXCEPT<br />
IF A WHEEL IS SPINNING<br />
In the LOCK position, an air operated clutch positively<br />
locks both sets of axles together, providing greater traction<br />
on slippery road surfaces; however, steering around<br />
corners and on dry pavement is more difficult. Continuous<br />
operation on a paved, dry surface stresses the tandem<br />
axles, possibly causing internal damage.<br />
Use this feature only when driving on surfaces with poor<br />
traction, such as wet slippery roads, heavy mud or snow,<br />
or loose gravel. And do not use it when going downhill or<br />
at speeds greater than 25 mph (40 km/h).<br />
Lock the inter-axle differential when you encounter road<br />
conditions such as these:<br />
• Ice or snow — with or without tire chains.<br />
<strong>Medium</strong> <strong>Duty</strong> (R05/09) Y53-6027 – 127 –