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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
WHEELS, RIMS, TIRES
Camber:
Excessive even tread wear on one or the other side of a
tire indicates too much wheel camber, Fig. 15. Unequal camber
can cause one tire to wear uneven and pull vehicle to one side.
Readjust camber to specifications of vehicle, see proper service
manual.
Fig. 15 Excessive Even Tread Wear on One Side Caused by
Too Much Camber
Mechanical Problems:
Mechanical
problems
or
underinflation
can
cause
irregular tread wear as shown in Fig. 16. A single spot or a
series of cuppings around the circumference of a tire is usually
caused by a combination of worn wheel bearings, worn shock
absorbers, loose tie rods, out of balance wheel and tire
assemblies, or brakes that grab. Inspect and service parts as
required.
Caster is the backward tilt of the axle or inclination of the
king pin at the top. Too little caster causes wheel wander or
weave resulting in irregular tread wear. Too much caster may
cause wheel "shimmy". Unequal caster will cause wheel pull to
one side, resulting in excessive irregular tread wear.
Fig. 16 Irregular Tread Wear May be a Sign of Mechanical
Problems
Misalignment:
Misalignment causes a tire to be dragged sideways over
the road. Excessive toe-in produces a feathered edge on the
inside of the tread design. Toe-out causes a feathered edge on
the out-side of the tread design. Align to specifications of
vehicle.
Fig. 17 Feathered Edge is Result of Misalignment
CTS-2176N Page 8
PRINTED IN UNITED STATES OF AMERICA
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