Rear Suspension Fasteners - Peterbilt 348 2017 Operator's Manual

REAR AXLE AND SUSPENSION

Rear Suspension Fasteners

To maintain the performance of the
air suspension, check fastener torque
values after the first 2,000 miles (3,218
km) of service and every 60,000 miles
(96,000 km) thereafter.
Torque recommendations apply to
fasteners supplied and installed by
vehicle manufacture. The values listed
in the tables below, are for cadmium
plated or phosphate and oil fasteners
only.
U-bolts are difficult to tighten unless
you have the right equipment. If you
5
cannot tighten them correctly yourself,
be sure to have them checked and
tightened regularly by an authorized
mechanic.
5-134
U-Bolt Torque
NOTE
To ensure an accurate torque read-
ing, use properly maintained and
calibrated torque wrenches. Clean
the nut and bolt. No dirt, grit, or rust
should be present.
WARNING!
Do not operate the vehicle if the
U-bolts are not properly tightened.
Loose U-bolts will cause the axle
to not be properly secured to the
suspension, which could cause loss
of vehicle control and an accident.
Loose U-bolts can also cause un-
even tire wear and poor alignment.
Failure to comply may result in
death, personal injury, equipment or
property damage.
Y53-6060-1C1
NOTE
Whenever possible, torque all fas-
teners on the nut end, not the bolt
head.
Rear Suspension Fasteners (Metric &
Standard)
SIZE/ TORQUE *
TYPE
Nm
M16 nylon- 163-217
insert nuts
M20 nylon- 352-460
insert nuts
M20 all- 427-475
metal lock
nuts
1/2 in. nut 109-122
394-462
3/4 in. nut
1-1/4 in. 1,877-
2,217
nut
* Torque requirements apply to
manufacturer proprietary suspensions. All
other suspensions must refer and adhere
to original manufacturers shop manual.
Lb-Ft
120-160
260-340
315-350
80-90
290-340
1,380-
1,630
(03/17)