2.
Do not mix tires of different size, type, or weight.
Tire wear should be even and not worn to limits
exceeding government specifications. Refer to
in this manual and
in the
Western Star 47X and 49X Workshop Manual
for
more information. Replace any tire that is exces-
sively worn.
3.
Check the inflation pressure of the tires. An un-
derinflated tire causes tread wear completely
around both tire shoulders. An overinflated tire
causes tread wear in the center of the tire. See
4.
Check for out-of-round wheels and wheel stud
holes. Replace the wheel if any of these condi-
tions exist.
5.
On each side of the vehicle, check the height of
the chassis above the ground. Sagging, fatigued,
or broken suspension springs create a lopsided
vehicle appearance. This causes an unbalanced
weight distribution. Anything that changes the
ratio of weight on the springs affects the align-
ment angles and also the tire tread contact area.
f400096a
10/21/2016
1
A
B
C
1.
Knuckle Pin (King Pin)
A. Positive Caster
B. Zero Caster
C. Negative Caster
Fig. 7, Caster Angle
f330082a
10/05/2016
A
B
NOTE: B minus A equals toe-in.
Fig. 8, Wheel Toe-In (overhead view)
f400094a
10/21/2016
A
A. Feathered Edges
Fig. 9, Tire Damage Due to Excessive Toe-In or
Incorrect Drive Axle Alignment
Front Axle
33
47X and 49X Maintenance Manual, August 2020
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