4
WARNING
32
Single, dualed
and wide base
wheels, hub
piloted mounting,
two-piece
flange nuts
(continued)
Hubs designed for steel hub piloted wheels may not have enough pilot length to locate
dualed aluminum wheels. Pay close attention to pilot length, particularly when converting
from steel to aluminum duals. Measure the hub pilot to make sure the hub has a minimum
pilot length of 1.06-inch or 27mm for dualed wheels.
When mounting painted steel inner dual wheels with outer aluminum wheels, be cautious
of excessive paint build-up on the inner steel wheel. Excessive paint can reduce the
clamping force and allow the wheels to become loose.
Match mounted dual wheels should be put on the vehicle with the valve stems 180° apart.
Tightening
hub piloted
mounting,
two-piece
flange nuts
4-11
Flange nuts must be kept tight, and studs and nuts should be checked frequently. At tire
changes, nuts and studs should be inspected to be sure they are in good condition.
If nuts require frequent tightening or studs break frequently, hardware and mounting
practices should be reviewed.
Impact wrenches, if used, should be carefully adjusted to apply torques within the limits
recommended. Torquing of flange nuts should be done in recommended sequences.
WARNING Undertorqued flange nuts allow wheels to run loose and fatigue
studs or lose nuts. Overtorquing can stretch studs causing them to fail.
Both under and overtorquing can lead to wheel disengagement causing
injury or death.
Check all parts including wheels, studs and flange nuts. Check mounting
faces of wheels, hubs and drums. Check for dirt, corrosion or damage.
Remove dirt and rust; replace damaged parts. Follow correct tightening
sequences and torque levels.
Two-piece flange nuts with a 33mm hex head design (see 4-2, page 24), used with hub
piloted wheels should be tightened to a torque of 450 to 500 foot-pounds. Two-piece
flange nuts with 1-1/2-inch hex head design and other designs have different torque
requirements. Inquire of the manufacturer for the proper torque values.
Wheel studs on both the right and left side hubs of vehicles utilizing the hub piloted
wheel system have right-hand threads.
Prior to mounting hub piloted wheels, generously coat the wheel pilot or hub pads with
a non-water-based lubricant to minimize corrosion product build-up between the wheel
and hub pilot. Excessive corrosion build-up between the wheel and hub pilots can make
wheel removal difficult. Do not lubricate the face of the wheel, hub or brake drum (see
illustration on the next page).
Continued on the next page.
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