PART 8: MAINTENANCE AND SERVICE VEHICLE LOADING
(R10/06) Y53-6007 – 163 –
Load Distribution: Be sure any load you carry is distrib-
uted so that no axle has to support more than its load
limit.
Wheels And Rims
02949
Hub Pilot Mount System Ball Seat Mount System
Hub, Drum, and Stud Assembly
• The hub pilot mounting system uses M22x1.5 met-
ric threads (about 7/8 in. dia.). The stud stands out at
least 1.9 in. beyond the brake drum. All studs are right
hand threads. Pilot bosses machined on the hub fit
tightly to the wheel center bore.
• The ball seat mounting system uses 3/4 x 16 or
1-1/8 x 16 threads. The dual mounting studs provide
1.3 - 1.44 in. standout. Right hand and left hand
threads are required. Inner and outer cap nuts center
the wheels by seating against wheel ball seats.
Wheels
• Pilot mount wheels have stud holes that are reamed
straight through (no ball seats). Center bore diameter
is 8-21/32 in. Budd Uni-Mount - 10 wheels have UNI
-
MOUNT stamped on the disc.
• Ball seat wheels have spherical chamfers machined
on each stud hole. Center bore diameter is 8-23/32 in.
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