TRUCK SERVICE MANUAL
WHEELS, RIMS, AND TIRES
CHAPTER I
WHEELS
GENERAL
The information presented herein covers factory installed wheels and hubs for medium and heavy duty vehicles. Many
types of wheels are available and they vary in size, types (disc or cast) and materials (steel or aluminum). Fundamentally,
they are the same in that all wheels (or hubs for disc wheels) are mounted to the axles on tapered roller bearings.
SAFETY PRECAUTIONS
Always deflate tires completely before removing locks or side rings.
Always inspect and clean all parts before assembly.
Always inflate tires in safety cage.
Always use a "clip-on" air chuck with remote valve to inflate tires.
Never mix parts of different types or size.
Never use cracked, bent or badly rusted parts.
Never reinflate flat tire on vehicle--use the spare.
Never add air until certain each side or lock ring is fully seated.
tighten to the nearest locking position and insert new key
WHEEL BEARING ADJUSTMENT
or lock. Bent type lockwasher is to have one tab bent
over the adjusting nut. For axles that have double nut
Satisfactory wheel operation and long bearing life
type lock, tighten jam nut to 136 203 N.m (100 150 ft lbs)
depends on correct wheel bearing installation, lubrication
and bend one tab of the lockwasher over the jam nut
and adjustment. The following will help you perform
(Fig. 1). These procedures are intended to result in zero
these required services for wheels and hubs.
to .25 mm (.010") end play with no preload.
FRONT WHEEL BEARINGS
Wheels or hubs, bearing cups, nuts, locks, hub caps,
shafts and spindles are to be free from any foreign
matter. Bearing cones must be properly packed with
specified lubricant if wheels are grease packed (see
LUBRICATION, Section CTS-2412).
If wheel bearings are oil lubricated dip bearing cones
in lubricant to provide proper starting lubrication. Outer
surface of bearing cone and matching surface of cup
may be coated with lubricant to promote cone-to-cup
adhesion and facilitate assembly.
After wheel (or hub) and bearings are assembled in
place on the spindle, tighten the wheel bearing adjusting
nut to 69 N.m (50 ft lbs) while rotating the wheel. Then
back off the nut 1/4 turn. If the lock or cotter key can be
installed at this position, do so; if not,
Fig. 1
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