Page 25
You must never use the hub piloted wheels, which have straight holes, with ball seat or spherical
chamfer nuts. These parts are not engineered to work together and can cause premature wheel
failure. On heavy truck dual wheels, this condition would not allow the inner cap nut to fit into the
inner wheel causing the inner cap nut to interfere with the outer wheel. This could cause premature
cracking and failure of the outer dual wheel.
Stud piloted wheels should not be used with the hub piloted hubs, wheels, or flange nuts.
Chamfered stud piloted wheels do not have sufficient surface area near the bolt hole to support the
flange nut. This type of misassembly may lead to loss of torque, broken studs, and cracked wheels.
Before reusing flange nuts that have already been used in service, apply 2 drops of oil at one point
between the flange and the hex. This will allow the parts to rotate freely and provide the proper
clamping force when tightened. Use any common lubricant typically used for fasteners. Examples
are: motor oil and general purpose lubricating oils. Excessive lubricant is not desirable and will not
improve nut performance. This will make the nuts hard to handle, attract dirt to the nuts, and may
cause unsightly appearance to the wheel. Only used nuts should be lubricated.
Since flange nuts generate higher clamping force, always use grade eight studs with hub piloted
wheels.
TORQUE NUTS PROPERLY.
ö
Be sure to tighten wheel nuts to the recommended nut torque. Do not overtighten. Tighten nuts
first to 50 ft-lbs, then to 450-500 ft-lbs torque (dry).Torque sequence should be per Figure 9.
ö
After the first 50 to 100 miles of operation, recheck the torque level and retighten nuts to the
proper level.
ö
Maintain nut torque at the recommended level through planned, periodic checks.
ö
Do
not
lubricate the nuts or studs.
ö
If air wrenches are used, they must be periodically calibrated for proper torque output. Use a
torque wrench to check the air wrench output and adjust the line pressure to give correct
torque.
ALWAYS USE HUB PILOTED WHEELS AND
FLANGE NUTS ON HUB PILOTED HUBS, AND STUD PILOTED WHEELS, AND
CHAMFERED NUTS ON STUD PILOTED HUBS. If different designs are mixed
or improperly matched, premature wheel failure will result, which could cause
an accident or injury.
Not all nuts and studs can be used with all types of
wheels. The use of improper nuts and studs can cause nut loosening, stud
failure, or premature wheel failure, which could cause an accident or injury.
