Western Star 47X 2020, Maintenance Manual

Page: 109 / 166

40–01 Wheel Nut Check
IMPORTANT: After a wheel has been installed,
the wheel nut torque must be rechecked after
50 to 100 miles (80 to 160 km) of operation.
Check the torque on all wheel nuts. See Table 1 for
torque specifications, and see Fig. 1 for the wheel
nut tightening sequence.
NOTE: Torque values are given for lubricated
threads. Apply 2 drops of SAE 30W oil to a
point between the nuts and flanges.
NOTICE
Insufficient wheel nut torque can cause wheel
shimmy, resulting in wheel damage, stud break-
age, and extreme tire tread wear. Excessive wheel
nut torque can break studs, damage threads, and
crack discs in the stud hole area. Use the recom-
mended torque values, and follow the tightening
sequence shown in
Fig. 1 .
Disc Wheel Fastener Torque
Nut Size
Torque: lbf·ft (N·m)
Oiled
M22 x 1.5 450–500 (610–678)
NOTE: If using specialty fasteners, consult the
manufacturer for recommended torque levels.
Table 1, Disc Wheel Fastener Torque
40–02 Tire Check
Tires should be inspected closely during the first
3000 to 10,000 miles (5000 to 16 000 km) for abnor-
mal wear.
Maintain the proper pressures for carried loads, per
the tire manufacturers’ recommendations, or the tire
pressure label on the driver’s door.
Truck alignment must be done at the initial mainte-
nance. Refer to
Group 33 of the Western Star 47X
and 49X Workshop Manual for instructions on the
wheel alignment.
Do not continue to drive the vehicle if tires develop
any of the following:
•
blisters;
•
cuts or punctures that reach to the cord;
•
a nail, screw, rock, or other puncturing object;
•
flat spots or irregular wear;
•
tread worn to a minimum depth;
•
inability to maintain proper tire pressure.
f400157 10/06/2016
1
2
3
4 5
6
7
8
9
10
Fig. 1, Wheel Nut Tightening Sequence
Wheels and Tires
40
47X and 49X Maintenance Manual, August 2020
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