Peterbilt 325 2017, Operator'S Manual

Page: 345 / 392

REAR AXLE AND SUSPENSION
Rear Suspension U-Bolts, Grade 8
(lubricated*)
TORQUE** U-BOLT
SIZE
DIAME-
TER
THREAD
Nm Lb-Ft
3/4 333-408 245-300
7/8 598-734 440-540
1 925-1,060 680-780
1-1/8 1,470-
1,660
1,080-
1,220
1-1/4 1,890-
2,120
1,390-
1,560
1-1/2 3,130-
3,860
2,300-
2,840
*Chevron Zinc Lubricant or SAE 20/30 oil
should be used on U-Bolt threads
**Torque requirements apply to
manufacturer proprietary suspensions. All
other suspensions must refer and adhere
to original manufacturers shop manual.
•
Load the vehicle to its normal
gross weight before tightening
U-bolts. Loading the vehicle
ensures proper adjustment of the
U-bolt and spring assembly.
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
a serious accident. Use only U-bolts
and nuts of SAE Grade 8 specifi-
cation or better. Failure to comply
may result in death, personal injury,
equipment or property damage.
Rear Axle Lubrication
Check oil level with the vehicle parked
on level ground and the fluid warm.
The level should be even with the
bottom of the filler hole.
CAUTION
Do not mix lubricants of different
grades; although, mixing different
brands of the same grade lubricant
(meeting MIL L2105C), is accept-
able. Lubricants of different grades
are not compatible and could dam-
age the axle.
(03/17) Y53-6060-1C1
5-135
5