KIC Catalog

and length than steel wheel inner nuts (See TMC RP

217A,

Attaching Hardware for Disc Wheels.

)

6. Separate all frozen cap nuts prior to reinstalling the

wheel. Do not attempt to reapply wheels that come

off with the inner cap nut frozen to the outer cap nut.

Each nut must be reinstalled properly with each nut

tightened to the proper torque level.

Never lubricate wheel or nut ball seats or mount-

ing faces.

If lubrication is desired, it should be used

sparingly only on the threads of the studs and/or nuts.

If lubrication is used, consult the wheel manufacturer

for torque recommendations.

8. Slide the front wheel or inner dual wheel over the

studs being careful not to damage the stud threads.

Lift the wheel to center one stud within its bolt hole

while installing an inner nut finger tight. Repeat with

another nut about 180 degrees away from the first.

Install the remaining nuts. Snug up nuts to about 50

ft. lbs. in the sequence shown in Figure 2. Do tighten

then fully until all have been seated. This procedure

will permit the uniform seating of nuts and ensure the

even, face to face contact of the wheels against the

hub or drum. Tighten the nuts to the recommended

mounting torque (see Table 1) using the same criss-

cross tightening sequence.

9. Place the outer dual wheel over the ends of the inner

nuts and install 2 outer nuts 180 degrees apart finger-

tight to locate the wheel. Install the remaining nuts

and tighten to 50 ft. lbs. using a crisscross sequence

as shown in

Figure 2

. Finally tighten the outer nuts

to the recommended torque (see

Table 1

) using the

same sequence.

10. 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. To check and re-

torque an inner nut, it is necessary to loosen the outer

nut first, and then tighten the inner nut. Finally, the

outer nuts must be retightened to the proper level.

11. It is recommended that a torque check be made as

part of a vehicles scheduled maintenance program or

at 10,000 mile intervals whichever comes first. Indi-

vidual fleet experience may dictate shorter intervals

or allow longer intervals.

12. 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.

SPOKE WHEEL/DEMOUNTABLE RIM SYSTEM IN-

STALLATION PROCEDURES

1. Ensure that the correct spacer band, rim, and clamp

combinations are being used for the application.

Check all parts for damage. Ensure that studs, nuts,

clamps and 28 degree mounting surfaces of the cast

spoke wheel and rim are sound, clean and free from

grease. Clean the cast spoke wheel with a wire brush

if scale is present. The spacer band should be clean

and free from distortion.

2. Replace any damaged or distorted part. Do not weld,

heat, or braze.

3. Install the rim after the tire is inflated. Multi-piece rims

may distort at high inflation and become difficult to

slip onto the cast spoke wheel. If this occurs deflate

the tire to not less than 80% of the recommended

inflation until the rim is mounted on the truck. If dif-

ficulties still exist, contact the rim manufacturer for

recommendations. Always adhere to OSHAstandard

No. 29 CFR, Part 1910.177 “Servicing Single-Piece

and Multi-Piece Rims/Wheels” and TMC RP 209B,

Wheel Installation & Maintenance

3 Spoke

5 Spoke

6 Spoke

Figure 3: Nut Tightening Sequence for Spoke Wheels

TMC Recommended Practices: Used by permission