Section 13: WHEELS, HUBS & TIRES
PA1593
4
of the nuts in present use, a few unengaged
threads at the outer end will cause no problem
provided at least 5-7 full turns are required to
disengage the nut depending on thread size.
4. 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 3, 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 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.
5. 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).
5.1 DRIVE AXLE WHEEL STUDS
Hub-mounted wheels are mounted with M22 x
1.5 studs and an M22 flange nut.
FIGURE 4: DRIVE AXLE WHEELS 13007
5.2 FRONT AND TAG AXLE WHEEL STUDS
Wheel is hub mounted on front and tag axle
(M22 x 1.5 thread).
FIGURE 5: SINGLE WHEEL 13025
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