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MAINTENANCE
s.;rusader
MC-8
[ "°'--------'----=15------'-1 _ _ _
DATE----=---=Ju;_;__J_I
y_i__,
_197_3 _ _ ] .
MANUAL
WHEELS. HUBS, TIRES
WHEELS
DESCRIPTION
Wheels supplied on Challenger coaches vary ac-
cording to the specifications of the user. Wheels are
of
standard type and manufacture and may have
either 2-piece or 3-piece rims. Either tube type or
tubeless tires may be used.
Standard wbeels are 20.00 x 8.00 for 11.50 x 20.00
tube-type tires or 22.50 x 8.25 wheels for 12.50 x ·
22.50 tubeless type.
The spare wheel and tire are carried in a com-
partment immediately behind the front bumper. Ac-
c~ss is gained by loosening retaining bolts located
directly beneath the bumper with a wheel wrench or
by _pulling out rubber lock from bumper door
retainer. Bumper will lock in open position.
JACKING UP VEHICLE
DESCRIPTION
Whenever it is necessary to change a wheel when a
flat occurs, the following procedures should be
followed:
FRONT AXLE: Turn front wheels to extreme right
or left, depending on which tire is flat, so that the
front of the flat tire is turned outward. Run flat tire
up on run up block. (Refer Figure 15-1 ). Run up
block supplied in tool compartment. Apply parking
brakes. Place jack under front jack pad and raise
c_oach. Remove run-up block and proceed to change
life. Lower jack and remove from under jack pad.
REAR DRIVE OUTSIDE DUAL: To change outside
dua~, place wooden run-up block at inside tire. Drive
vehicle onto block to raise outside dual off ground.
J:ully apply parking brakes and proceed to change
tJre.
REAR DRIVE INSIDE DUAL: To change inside
dual-wheel, fully apply parking brakes. Position jack
under rear jack pad. Jack up axle and proceed to
change tire.
Figure
15-1:
Run-up Block
REAR TRAILING WHEEL: In case of a flat tire on
the rear trailing wheels, release air pressure from
bellows by turning the air release valve towards the
rear of the coach until air is released from bellows.
Position jack under jack pad and proceed to change
tire.
NOTE: If no spare wheel is available for the rear
trailing axle, the wheel should be raised and removed
from axle. The hook-up link should be installed to
hold up the axle. Reduce road speed to a minimum
with axle in raised position.
·
WHEEL NUT TIGHTENING
PROCEDURE
It is important that wheel stud nuts be tightened
alternately on opposite sides of wheel. Refer to
Figure 15-2 for suggested sequence for tightening and
a recommended procedure following.
(A) Run
the stud nuts in lightly referring to Figure
15-2 for sequence so that wheel will position it-
self concentrically with hub. This is important,
otherwise wheel may be eccentric with hub and
will not run straight. In this initial step, run the
nuts up only as necessary to correctly position
wheel.
(B) Tighten stud nuts progressively as shown in
Figure 15-2 with an impact wrench. But final
tightening should be done with a torque wrench.
Tighten stud nuts to 450-500 ft. lbs.
7@
1
@
@5
3@0
1o@Y
@9
@4
6@
@
@8
2
Figure
15-2:
Stud Tightening Sequence
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