FASTENERS
PART 8: MAINTENANCE AND SERVICE
– 208 –
Y53-6032
(R05/10)
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.
WARNING!
Do not operate the vehicle if the U–
bolts are not properly tightened. Loose U–bolts
do not properly secure the axle to the suspen-
sion. This could cause loss of vehicle control
and an accident resulting in death or injury.
Loose U–bolts can also cause uneven tire wear
and poor alignment.
WARNING!
Failure to maintain the specified
torque values or to replace worn parts can cause
component system failure, possibly resulting in
an accident causing death or injury. Improperly
tightened (loose) suspension U–bolts can lead
to unsafe vehicle conditions, including: hard
steering, axle misalignment, spring breakage or
abnormal tire wear. See the Fastener Torque
Tables for proper torque specifications.
WARNING! Do not replace U–bolts and nuts
with common U–bolts or standard nuts. These
parts are critical to vehicle safety. If the wrong
U–bolts or nuts are used, the axle could
loosen or separate from the vehicle and cause
an accident involving death or personal injury.
Use only U–bolts and nuts of SAE Grade 8
specification or better.
Fasteners
Frame Fastener Torque Specifications
CAUTION: When installing bolts on the frame,
use only metric grade 10.9 bolts of the proper
length.
Table 14
Frame Fastener Torque Specifications
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
315 - 385
427 - 523
Y53-6032.book Page 208 Monday, May 24, 2010 3:37 PM
Summary of Contents for Peterbilt 587
Page 1: ......