KIC Catalog

then apply nuts finger-tight on the remaining studs.

Snug the nuts to about 50 ft. lbs. following a crisscross

sequence as shown in

Figure 1.

Finally, tighten all

the nuts to the recommended torque (see

Table 1

)

using the same crisscross sequence.

11. After the wheels are installed, check to see that both

wheels are still seated on to the pilots and are flat

against the drum. This can be done by inspecting the

seating of the wheels on all four pilots and by turning

the wheels and checking for irregularity of the wheel

assembly.

12. After a wheel assembly has been installed, recheck

the torque level between 50 and 100 miles of opera-

tion and retighten if necessary to the recommended

torque using the proper sequence. 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. Individual fleet ex-

perience may dictate shorter intervals or allow longer

intervals.

13. If air wrenches are used, they must be periodically

calibrated for proper torque output. Use a torque

wrench to check the air wrench output. If output is not

correct, take the necessary steps to adjust output.

DISC WHEEL INSTALLATION PROCEDURE –

STUD PILOTED DISC WHEEL SYSTEM.

1. Check all parts for damage including wheels and

rings. Ensure that studs, nuts and mounting faces of

hubs, drums and wheels are free of dirt and grease.

The hub or drum mounting face must be cleaned

and kept flat. Clean hub or drum surface with a wire

brush if rust or debris is present. Note the condition of

the hub and drum. Replace them if worn or cracked

bolt holes or a worn hub or drum face are evident .

If a heavy duty ball seat (1-3/16” spherical radius)

system is used, make sure the wheels are proper for

the vehicle. Never mix hub-piloted disc wheels and

hubs with ball-seat disc wheels and hubs. The result

could be loss of torque, a cracked wheel or possible

wheel loss.

2. Wire brush at the base of each stud as well as the

threads to remove any rust or foreign material which

could bind up the wheel nuts.

3. Check for damaged studs. Replace any parts which

exhibit wear or damage. Ensure replacement studs

are the proper ones for the system used. Stud break-

age can result if the wrong studs are used.

If a stud is broken, replace it and the stud on each

side of the broken one. If 2 or more studs are broken,

replace them all. Use a press to install studs and be

sure the hub flange is supported. Aluminum hubs

require different stud installation procedures. Consult

the manufacturer for recommendations. Stud heads

can be bent from hammer blows which will prevent

the stud from seating properly and can result in stud

failure.

4. Check the wheel for damage, elongated bolt holes,

wear, corrosion, cracks around bolt holes or center

hole or torch cuts and replace as necessary. If slight

burrs have been raised around the ball seats, use a

file to remove them. Be sure not to cut into the flat

surface of the wheel mounting face. Wire brush inner

and outer cap nuts if rust accumulation is evident. If

threads are damaged or corrosion is heavy, discard

nuts. Also discard nuts that show damage or wear

to ball seats or hex areas.

5. Be certain you have correct fasteners. Nuts used in

the hub piloted system cannot be used in the stud

piloted system. Single aluminum wheels on ¾” stud

use different nuts than steel wheels. Dual aluminum

wheels require special inner nuts with greater strength

Wheel Installation & Maintenance

Figure 2: Nut Tightening Sequence for Stud Piloted Disc Wheels

TMC Recommended Practices: Used by permission