Peterbilt Medium Duty Trucks Operator's Manual after 1-07

Preventive Maintenance
Front Axle and Suspension
FRONT AXLE AND SUSPENSION
Inspection
For all vehicles, mandatory maintenance procedures include
retightening all U–bolts and inspecting the suspension for
loose fasteners, abnormal wear, or damage. However, even
with proper maintenance, the service life of leaf springs is
affected by many factors, such as: fatigue, vehicle gross
weight, type of load, road conditions, and vehicle speed.
SPRING AND
SHACKLE PINCH
BOLTS
SPRING
ANCHOR
PINS
• Check for cracks, wear marks, splits, or other defects on
the surface of the spring. Defective parts must be
replaced. Because repaired springs cannot be fully
restored to their original service life, replace the complete
assembly if cracks or other defects are detected.
Front Suspension
SPRING
ANCHOR PIN
U-BOLTS
00439
• Visually inspect shock absorbers and rubber bushings.
See the Medium Duty Maintenance Manual for further
information on servicing the front suspension.
Axle Lubrication
• Change bearing lubrication when seals are replaced, or
brakes are relined. See Table 2, “Recommended Maintenance
Intervals,” Page 120.
Medium Duty (R10/06) Y53-6008 – 209 –