Regional Haul Model Operator's Manual - Peterbilt Motors Company
Regional Haul Model Operator's Manual - Peterbilt Motors Company
Regional Haul Model Operator's Manual - Peterbilt Motors Company
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PREVENTIVE MAINTENANCE<br />
Rear Axle and Suspension<br />
General Maintenance<br />
WARNING! Do not work on the vehicle without<br />
the parking brake set and wheels chocked<br />
securely. If the vehicle is not secured to prevent<br />
uncontrolled vehicle movement, it could<br />
roll and cause death, personal injury or damage<br />
to the vehicle.<br />
• Use wood blocks (4 in. X 4 in. or larger)<br />
against the front and rear surfaces of the<br />
tires. Be sure the vehicle cannot move.<br />
Your vehicle's suspension, by design, requires a minimal<br />
amount of maintenance. However, suspensions in “overthe-road”<br />
operations require periodic inspection to ensure<br />
trouble-free performance.<br />
WARNING! Do not operate the vehicle if the<br />
U–bolts are not properly tightened. Loose U–<br />
bolts do not properly secure the axle to the<br />
suspension. This could cause loss of vehicle<br />
control and an accident resulting in death or<br />
injury. Loose U–bolts can also cause uneven<br />
tire wear and poor alignment.<br />
REAR AXLE AND SUSPENSION<br />
WARNING! Failure to maintain the specified<br />
torque values or to replace worn parts can<br />
cause component system failure, possibly<br />
resulting in an accident causing death or<br />
injury. Improperly tightened (loose) suspension<br />
U–bolts can lead to unsafe vehicle conditions,<br />
including: hard steering, axle<br />
misalignment, spring breakage or abnormal<br />
tire wear. See the Fastener Torque Tables for<br />
proper torque specifications.<br />
CAUTION: Do not spray the suspension with<br />
chemical products or mineral oil; it can cause<br />
damage to the bushings.<br />
NOTE: Failure to follow these recommendations<br />
could void warranty. See the “Maintenance <strong>Manual</strong>”<br />
for further information on servicing the rear<br />
suspension.<br />
Visual Inspection<br />
For all vehicles, mandatory maintenance procedures<br />
include retightening of U–bolts and complete inspection.<br />
However, even with proper maintenance, many factors<br />
affect the service life of springs and suspension components,<br />
such as: fatigue, vehicle gross weight, type of load,<br />
road conditions and vehicle speed.<br />
<strong>Regional</strong> <strong>Haul</strong> (R05/10) Y53-6033 – 245 –
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