5
31
Tightening stud
located, ball seat
cap nuts
5-8
Cap nuts must be kept tight, and studs and nuts should be checked frequently. Nuts should be
retorqued if necessary. At tire changes, nuts and studs should be inspected for cracks and stripped
or damaged threads. After each wheel mounting, cap nut torque should be checked with a torque
wrench.
Impact wrenches, if used, should be carefully adjusted to apply torques within the limits recommend-
ed. Torquing of cap nuts should be done in recommended sequences.
Some states have laws which dictate full thread engagement or thread engagement past the nut body.
Make sure you know the laws for the states in which you operate and comply.
WARNING
WARNING Lubricants should not be applied to the cap nut seat or to the cap nut-to-wheel
contact surface.
Oiled seats can lead to over-torquing which can stretch studs causing failure of studs.
Failed studs can cause the wheel to disengage from the vehicle, causing serious injury
or death.
Lubricants must be completely removed from the cap nut seats and contact surfaces if
applied accidentally.
WARNING Undertorqued cap nuts allow wheels to run loose, pounding out (deforming)
the ball seats, fatiguing studs or losing nuts. Overtorquing can stretch studs causing them
to fail.
Both under and overtorquing can lead to wheels coming off, causing serious injury or
death.
Check all parts, including wheels, studs and cap 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.
Continued on next page
WARNING
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