Peterbilt Medium Duty Trucks Operator's Manual after 1-07
Peterbilt Medium Duty Trucks Operator's Manual after 1-07
Peterbilt Medium Duty Trucks Operator's Manual after 1-07
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Rear Axle and Suspension<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 roll and<br />
cause serious personal injury or damage to the<br />
vehicle.<br />
• Use wood blocks (4 in. X 4 in. or larger) against the<br />
front and rear surfaces of the tires. Be sure the vehicle<br />
cannot move.<br />
Your vehicle's suspension, by design, requires a minimal<br />
amount of maintenance. However, suspensions in “over-theroad”<br />
operations require periodic inspection to ensure trouble-free<br />
performance.<br />
WARNING! Do not operate the vehicle if the U–<br />
bolts are not properly tightened. Loose U–bolts<br />
do not properly secure the axle to the suspension.<br />
This could cause loss of vehicle control<br />
and an injury accident. Loose U–bolts can also<br />
cause uneven tire wear and poor alignment.<br />
Preventive Maintenance<br />
WARNING! Failure to maintain the specified<br />
torque values or to replace worn parts can cause<br />
component system failure, possibly resulting in<br />
an injury accident. Improperly tightened (loose)<br />
suspension U–bolts can lead to unsafe vehicle<br />
conditions, including: hard steering, axle misalignment,<br />
spring breakage or abnormal tire<br />
wear. See the Fastener Torque Tables for proper<br />
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 “<strong>Medium</strong> <strong>Duty</strong> Maintenance<br />
<strong>Manual</strong>” for further information on servicing<br />
the rear suspension.<br />
Visual Inspection<br />
For all vehicles, mandatory maintenance procedures include<br />
retightening of U–bolts and complete inspection. However,<br />
even with proper maintenance, many factors affect the service<br />
life of springs and suspension components, such as:<br />
fatigue, vehicle gross weight, type of load, road conditions<br />
and vehicle speed.<br />
– 212 – Y53-6008 <strong>Medium</strong> <strong>Duty</strong> (R10/06)