40–01 Wheel Nut and Rim Nut
Check
IMPORTANT: After installing a wheel, the wheel
or rim nut torque must be rechecked after 50 to
100 miles (80 to 160 km) of operation.
See Table 1 for wheel nut torque specifications, and
see Fig. 1 for the wheel nut tightening sequence.
CAUTION
Insufficient wheel nut (rim nut) torque can cause
wheel shimmy, resulting in wheel damage, stud
breakage, and extreme tire tread wear. Excessive
wheel nut torque can break studs, damage
threads, and crack discs in the stud hole area.
Use the recommended torque values, and follow
the tightening sequence shown in Fig. 1.
When checking wheel nuts on a dual disc assembly,
remove one outer nut at a time, torque the inner nut,
then reinstall and torque the outer nut. Repeat this
procedure for all wheel nuts, using the tightening se-
quence shown in Fig. 1.
Description Nut Size Wheel Manufacturer Torque: lbf·ft (N·m)
8-Stud Disc Wheel With Two-Piece Flanged Locknuts (with lubricated threads)
Front and Rear Wheel Nut — All 450–500 (610–680)
10-Stud Disc Wheel With Two-Piece Flanged Nuts (with lubricated threads)
Front and Rear Wheel Nut M22 x 1.5 Budd (Uni–Mount 10) 390–440 (530–600)
10-Stud Disc Wheel With Inner and Outer Locknuts (with dry threads)
Front Wheel Nut 1-1/8–16
Alcoa 400–500 (540–680)
All Others 450–500 (610–680)
Rear Wheel Inner Nut 3/4–16
Alcoa 400–500 (540–680)
All Others 450–500 (610–680)
Rear Wheel Outer Nut 1-1/8–16
Alcoa 400–500 (540–680)
All Others 450–500 (610–680)
Wheel Stud Retainer Nut 3/4–16 All 175–200 (235–270)
Spoke Wheel Rim Nuts (with dry threads)
Front Wheel Nut, 5- and 6-Spoke 3/4–10 Gunite 200–225 (271–305)
*
Rear Wheel Nut, 5- and 6-Spoke With
Non-Corrugated Channel Spacer
3/4–10 Gunite 200–225 (271–305)
Rear Wheel Nut, 5- and 6-Spoke With
Corrugated Channel Spacer
3/4–10 Gunite 240–260 (325–350)
*
On front axles with over 12,000 lbs (5448 kg) capacity, tighten the wheel nuts 240 to 265 lbf·ft (325 to 359 N·m). Gunite part number W–854 nut with a
phosphate-and-oil coating must be used.
Table 1, Wheel Fastener Torque
Wheels and Tires 40
Century Class Trucks Maintenance Manual, January 1996 40/1
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