VEHICLE LOADING PART 8: MAINTENANCE AND SERVICE
– 184 – Y53-6032 (R05/10)
Load Distribution: Be sure any load you carry is distributed
so that no axle has to support more than its load limit.
Wheels And Rims
Hub Pilot Mount System Ball Seat Mount System
Hub, Drum, and Stud Assembly
• The hub pilot mounting system uses M22x1.5 metric
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.
02949
Y53-6032.book Page 184 Monday, May 24, 2010 3:37 PM
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