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Wheel cap nuts must be kept tight. When checking the cap nuts on dual disc wheels utilizing the stud located ball seat mounting system, loosen every other outer cap nut and then check the torque of the inner cap nuts. Retorque the loosened outer cap nuts. Repeat procedure with the rest of the nuts. Check all cap nuts for proper torque after the first use or any removal. Inspect wheels and check wheel nuts during service stops. Dirt streaks from cap nuts may indicate looseness.

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.

For proper nut torque, refer to the chart below:

Mount
Type
Nut
Thread
Torque Level Ft-Lb
Lubricated*
Torque Level Ft-Lb
Dry*
Hub piloted using
two-piece flange nut
11/16" - 16
7/8" - 14
M20 x 1.5
M22 x 1.5
300-400
350-400
280-330
450-500
 
Stud piloted, double cap
nut standard type
(7/8" radius)
3/4" - 16
1-1/8" - 16
  450-500
450-500
Stud piloted, double cap
nut heavy duty type
(1-3/16" radius)
15/16" - 12
1-1/8" - 16
1-5/16" - 12
  750-900
750-900
750-900

*For nuts used on hub piloted wheels, apply two drops of motor oil to the point between the nut and flange and two drops to the first two or three threads at the tip of each stud. For nuts used on stud piloted wheels, apply two drops of motor oil to the first two or three threads at the tip of each stud only.

NOTE:

  1. If using specialty fasteners (cap nuts), consult the manufacturer for recommended torque values.
  2. Tightening wheel nuts to their specified torque is extremely important. Undertightening results in loose wheels which can damage wheels, studs and hubs, and can result in wheel loss. Overtightening can damage studs, nuts and wheels, and results in loose wheels as well.
  3. All torque wrenches, air wrenches and any other tools should be calibrated periodically to ensure the proper torque is applied.
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