PART 8: MAINTENANCE AND SERVICE
PB1319 (CAT. NO. 5296 ) —151— 22-01691 (R02/02)
Rear Axle Alignment
Continual road shock and load stresses may force your rear axles out
of alignment. If you detect rapid tire wear on the rear axles, you may
have misaligned axles. If you suspect you do, have your rear axle
alignment checked and adjusted by an authorized dealership.
U-Bolt Tension for Front and Rear Axles
It is important that U-bolts remain tight. Off-highway use of your vehi-
cle will cause them to loosen faster. But all vehicles need to have
their U-bolts checked and tightened regularly. Be sure someone with
the proper training and the right tools checks and tightens the U-bolts
on your Peterbilt. The proper torque requirements are specified in the
Peterbilt Maintenance Manual for your vehicle.
Frame Fastener Torque Specifications
WARNING! U–bolts that are too loose can cause an injury
accident. Loose U–bolts can cause uneven tire wear, poor
alignment, and loss of control of your vehicle. U–bolts are
difficult to tighten unless you have the right equipment. If
you can not tighten them correctly yourself, be sure to
have them checked and tightened regularly by an autho-
rized mechanic.
•
For on-highway vehicles, tighten the U-bolts after the
first 15,000 miles (24,000 km). Then tighten them every
60,000 miles (96,000 km) after that.
•
For off-highway vehicles, tighten the U-bolts after the
first day or two of operation. Then tighten them every
15,000 miles (24,000 km) after that.
WARNING! Failure to maintain the specified torque values
or to replace worn parts can cause component system fail-
ure, possibly resulting in an injury accident. Improperly
tightened (loose) suspension U–bolts can lead to unsafe
vehicle conditions, including: hard steering, axle misalign-
ment, spring breakage or abnormal tire wear.
Fastener
Type
Fastener
Size
Torque
Lb. ft. N.m.
Bolt / Locknut /
Hardened Washer
1/2 Inch 86 - 108 117 - 147
5/8 Inch 130 - 163 176 - 221
M12 65 - 85 89 -115
M16 155 -195 210 - 264
M20 495 - 605 668 - 818
CAUTION: When installing bolts on the frame, use only
metric grade 10.9 bolts of the proper length.
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