Section 13: WHEELS, HUBS & TIRES
PA1553
2
1. WHEELS
When the vehicle is provided with stud-mounted
wheels, wheel studs and nuts on the left side of
the vehicle have left-hand threads whereas
those on the right side have right-hand threads.
If equipped with hub-mounted wheels, all studs
and nuts have right-hand threads. Aluminum-
polished wheels are installed on the vehicle and
are mounted with radial tubeless tires.
Drive axle wheel dimensions are 22.50 X 9.0
inches (571.5 X 228.6 mm) for 315/80 R 22.5
tires while front and tag axle wheels may either
be 22.50 X 9.0 inches (571.5 X 228.6 mm) or
22.50 X 10.5 inches (571.5 X 266.7 mm) for
365/70 R 22.5 tires. Dura-Bright coating on
aluminum wheels is optional.
FIGURE 1: WHEEL ARRANGEMENT 13037
2. WHEEL MAINTENANCE
Wheel maintenance consists of periodic
inspections. Check all parts for damage and
make sure that wheel nuts are tightened to the
proper torque. In the case of a new vehicle, or
after a wheel installation, stud nuts should be
tightened every 100 miles (160-km) for the first
500 miles (800-km) to allow setting in of
clamping surfaces.
Wheel studs and nuts must be kept free from
grease and oil. No lubricant whatsoever should
be used. Cleanliness of the wheel and its rotor
mating surfaces is important for proper wheel
mounting.
However, for hub mounted wheels, it is
recommended to add some rust protection
lubricant on the pilot diameter of the hub (to
facilitate future removal).
It is also important that wheel stud nuts be
tightened alternately on opposite sides of the
wheel. Refer to Figure 2 for the suggested
tightening sequence.
2.1 INSPECTION
Tighten stud nuts progressively as shown in
Figure 2. The final tightening should be done
with a torque wrench. Tighten stud nuts to 450 -
500 lbf-ft (610 - 680 Nm) for aluminum wheels.
FIGURE 2: TIGHTENING SEQUENCE 13018
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