User's Manual

48
Date of Origin – 02/01/08
WHEEL ASSEMBLIES
Inspect parts and components for damage. Replace any defective parts.
Use only correctly matched parts when assembling and installing wheels. Incorrect parts can
result in separation of the wheel components which can lead to an accident.
Assembling painted, dirty, or rusty components can prevent proper mating of parts. Make sure all
mounting surfaces are clean and free of rust, dirt, or excessive paint.
Make certain all tires are matched to the same rolling circumference per the tire manufacturer’s
instructions. Do not use tires that do not meet this criterion. Doing so may result in unstable
operation that can significantly reduce service life.
All components must be correctly installed and fasteners tightened to the recommended torque to
assure maximum service life in accordance with the manufacturer’s instructions. Failure to do so
may result in serious injury or death.
WHEEL INSTALLATION
Hub piloted disc wheels have stud holes that are drilled straight through the wheel. Pilot bosses
machined on the hub fit tightly into the center of the disc wheel. This supplies the alignment of the
wheel to hub. Hub Piloted wheels are secured to the hub with flanged nuts.
Installation of a Hub Piloted Wheel
1. Be sure not to mix Hub Piloted and Stud Piloted disc wheels.
2. Use the correct flange nuts to match your wheels. Failure to do so may lead to loose
wheels which significantly reduce product life and may result in a crash. Before proceeding
with the installation of the disc wheels make certain that you are using the proper flange
nuts. The Hub Piloted mounting uses M22 x 1.5mm pitch metric thread series nuts. The
stud standout should be at least 2.16”. All studs have right hand threads.
3. Rotate the hub so that one of the intermittent pilots is located at the top position.
4. Position the inner disc wheel over the studs and wheel pads being careful not to damage
the stud threads or the pilot diameter of the wheel. Make sure the disc wheel is flat against
the mounting surface and there is clearance between the disc wheel taper and the brake
drum.
5. Position the outer disc wheel over the studs and wheel pilot pads being careful not to
damage the stud threads or the pilot diameter of the wheel. Be sure the valve stems for
both the inner and outer tires are accessible.
6. Install the flange nuts and tighten to 50 ft. lbs following the sequence shown. Note: On two
piece flange nuts, apply a drop of oil between the nut and washer. Make sure the flange
washer is not seized to the nut. Do not lubricate the mounting surface of the drum or wheel,
or the stud threads.
7. Check both disc wheels for proper positioning on pilots and proper sealing against the
drum/hub assembly. If they are not, loosen the flange nuts and reposition the wheels.
8. Tighten the flange nuts to 450 to 500 ft. lbs. dry thread torque following the sequence below.
Recheck the torque after the first 50 to 100 miles of service and at every pre-trip inspection.