Wheel Straightness Test; Wheel Studs - PREVOST H3-41 Maintenance Manual

SECTION 13: WHEELS, HUBS AND TIRES
Clean aluminum wheels as required to maintain
original look.
WARNING
Wheel surfaces may have sharp or cutting
edges that may cause injury to the hands. To
prevent contact with sharp edges, it is strongly
recommended to wear rubber gloves when
washing or polishing wheels.

6. WHEEL STRAIGHTNESS TEST

1. Slightly raise axle to be checked and place a
safety support underneath;
2. Check wheel lateral run-out. Install a dial
gauge as shown in figure 4, then rotate the
wheel by hand one full turn. As the wheel
turns, note any variation on the dial gauge;
CAUTION
Damage to the dial gauge could occur if it
strikes a wheel balancing weight.
3. If the variation in lateral run-out exceeds
0.0625 inch (1,6 mm), the wheel must be
replaced.
FIGURE 4: DIAL GAUGE INSTALLATION
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;
10
PA1621 Maintenance Manual All Series | January 2017
If, within specifications, the hub is correct but

the suspected wheel must be replaced.
WARNING
NEVER STRAIGHTEN
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
structure. Furthermore, never weld aluminum-
forged wheels for any reason whatsoever.

7. WHEEL STUDS

Stripped threads may be the result of excessive
torque 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: 450-500 lb-ft (610-678 Nm)
60 nuts
7.1 DRIVE AXLES WHEEL STUDS
Hub-mounted wheels are mounted with M22x1.5
studs and an M22 flange nut.
FIGURE 5: DRIVE AXLE WHEELS
ALUMINUM
could alter wheel