5
WARNING
34
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 1.38-inch
or (35mm) 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.
Tightening
hub piloted mounting,
two-piece
flange nuts
5-10
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 recommend-
ed. Torquing of flange nuts should be done in recommended sequences.
WARNING Under or Over torqued flange nuts allow wheels to run loose and fatigue
studs or lose nuts. Overtorquing can stretch studs causing them to fail with loss to
torque and may cause pre-mature fatigue.
Both under and overtorquing can lead to wheel disengagement causing serious 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 Section5-2), 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. See section 6-2.
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 lubri-
cate the face of the wheel, hub or brake drum (see illustration on the next page).
Continued on the next page.
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