390 / 561
U.S. 888-725-9355
MeritorPartsOnline.com
6-59
Canada 800-387-3889
WHEEL END
DISC WHEEL SERVICE INFORMATION
INSTALLATION TIPS
1. Never mix hub-piloted and stud-piloted wheels, hubs and nuts. The result could be loss of torque, a cracked
wheel or possible wheel loss.
2. For nuts used on hub-piloted wheels, apply two drops of oil to a point between the nuts and flanges and two
drops to the last 2 or 3 threads at the end of each stud. Also, lightly lubricate the pilots on the hub to ease wheel
installation and removal. Do not get lubricant on the mounting face of the drum or wheel.
3. For nuts used on stud-piloted wheels, do not use lubrication. Never lubricate wheel or nut ball seats or mounting
faces. If lubrication is used, consult the wheel manufacturer for torque recommendations.
4. Install nuts using proper installation sequence as shown below. Snug up nuts to about 50 ft.lbs. Torque. Do not
tighten fully until all have been seated; then torque to specs as shown below using the same installation se-
quence.
5. After a wheel assembly has been installed, recheck the torque level between 50 and 100 miles of operation and
retighten if necessary to the recommended torque using the proper sequence.
a. To check and retorque an inner cap nut, it is necessary to loosen the outer cap nut first; then tighten the inner
cap nut. Outer cap nuts then must be retightened to the proper level.
b. It is recommended that a torque check be made as part of a vehicle’s scheduled maintenance program or at
10,000 mile intervals, whichever comes first.
TORQUE CHART
MOUNTING TYPE
NUT THREAD
TORQUE LEVEL
Hub-piloted with flange nut
11/16” – 16
280-330 ft. lbs (oiled)*
M20 x 1.5
450-500 ft. lbs (oiled)*
M22 x 1.5
300-400 ft. lbs (oiled)*
Stud-piloted, double cap nut- heavy-
duty type (7/8” ball seat radius)
3/4” – 16
450-500 ft. lbs (dry)*
1-1/8” - 16
450-500 ft. lbs (dry)*
Stud-piloted, double cap nut -
heavy-duty type (1-3/16” ball seat
radius)
15/16” – 12
750-900 ft. lbs (dry)*
1-1/8” – 16
750-900 ft. lbs (dry)*
1-5/16” - 12
750-900 ft. lbs (dry)*
* See Installation Tip #2 (above)
Information courtesy of TMC (The Maintenance Council of The American Trucking Association). For complete wheel
service guidelines see TMC RP-222, “User’s Guide to Wheels and Rims”.