PREVOST X3-45 Multiplex, Maintenance Manual

Page: 694 / 1422

Section 13: WHEELS, HUBS & TIRES
PA1562
6
FIGURE 3: DIAL GAUGE INSTALLATION
13008
If doubt exists whether wheel or hub is distorted,
hub may be checked as follows:
•
Replace the existing wheel with a wheel
known to be correct;
•
Check wheel lateral run-out as outlined in
step 2;
•
If, within specifications, the hub is correct
but the suspected wheel must be replaced.
WARNING
NEVER STRAIGHTEN ALUMINUM
WHEELS.
Never heat aluminum wheels to
repair damages incurred after hitting a curb or
resulting from other causes. The special alloy
in wheels has been heat treated, and any
uncontrolled heating could alter wheel
structure. Furthermore, never weld aluminum-
forged wheels for any reason whatsoever.
6. WHEEL STUDS
Stripped threads may be the result of excessive
torquing or may have been damaged during
wheel installation when placing the wheel over
the studs. A stud having damaged threads must
be replaced. Broken studs are a direct result of
operating with loose stud nuts or improperly
seated wheels. When a broken stud is replaced,
the adjacent studs, on each side of the broken
one must also be replaced since they could
have been subjected to excessive strain and
may be fatigued.
When installing wheel studs to hubs, check nuts
retaining the wheel stud to wheel hub and
replace if they are deformed, damaged or
severely corroded. Install nut (and washer where
applicable) to new stud. Torque to 450 - 500 Ft-
lbs (610 - 680 Nm).
NOTE
For stud-mounted wheels, turn nuts
counterclockwise for R.H. side and clockwise
for the L.H. side of vehicle. For hub-mounted
wheels, turn nuts counterclockwise on both
sides of the vehicle.
6.1 DRIVE AXLE STUDS
Stud-mounted wheels are mounted on the drive
axle with ¾"-16 studs with an inner cap nut, and
a 1-1/8”-16 nut. Hub-mounted wheels are
mounted with M22 x 1.5 studs and an M22
flange nut.
FIGURE 4: STUD-MOUNTED WHEELS
13007
6.2 FRONT AND TAG AXLE STUDS
Wheel can be mounted on tag axle with studs
(1-1/8"-16 thread) or hub mounted (M22 x 1.5
thread).
NOTE
Wheel studs and nuts must be kept free from
grease and oil. No lubricant whatsoever
should be used.
WARNING
The two wheel mounting systems are not
interchangeable.
They have their specific
wheel, nut and stud types. Use only the
specific hardware suitable for a mounting type.
Always install a wheel to the corresponding
mounting type hub.