Thomas SAF-T-LINER C2, Руководство по обслуживанию

Страница: 103 / 176

40–01 Wheel Nut Checking
IMPORTANT: In addition to the maintenance
interval in this manual, check the wheel nut
torque the first 50 to 100 miles (80 to 160 km)
of operation after a wheel has been removed
and installed.
When checking wheel nuts on a stud-piloted dual
disc assembly, remove one outer nut at a time,
tighten the inner nut, then reinstall the outer nut. Re-
peat this procedure for all of the inner wheel nuts in
the sequence shown in
Fig. 1 , then tighten all of the
outer wheel nuts in the same sequence.
CAUTION
Too little wheel nut torque can cause wheel
shimmy, resulting in wheel damage, stud break-
age, and extreme tire tread wear. Too much wheel
nut torque can break studs, damage threads, and
crack discs in the stud hole area.
See Table 1 for wheel nut torque specifications and
see Fig. 1 for the tightening sequence.
Wheel Nut Torque Specifications
Thread Size Wheel Manufacturer
Torque (oiled):
lbf·ft (N·m)
M20 x 1.5 Accuride Corporation 280 to 330 (380 to 447)
M22 x 1.5 Accuride Corporation 450 to 500 (610 to 678)
1-1/8–16 Accuride Corporation 450 to 500 (610 to 678)
3/4–16 Accuride Corporation 450 to 500 (610 to 678)
Table 1, Wheel Nut Torque Specifications
09/18/2001
A B
f400164
1
10
8
6 3
5 4
9
2
7
1
2
4
6
7
5
8 3
A. 8-Stud Disc Wheel B. 10-Stud Disc Wheel
Fig. 1, Wheel Nut Tightening Sequence
Wheels and Tires
40
Saf-T-Liner C2 School Bus Maintenance Manual, February 2004
40/1