Freightliner FLA/FLB/FLC/FLD/FLL. Manual — part 28
40–01 Wheel Nut and Rim Nut
Checking
IMPORTANT: In addition to the maintenance
interval in the general information section, check
the wheel (or rim) nut torque the first 50 to 100
miles (80 to 160 km) of operation after a wheel
has been removed and installed.
See
for wheel nut torque specifications, and
see
for the wheel nut tightening sequence.
CAUTION
Insufficient wheel nut (rim nut) torque can cause
wheel shimmy, resulting in wheel damage, stud
breakage, and extreme tire tread wear. Excessive
wheel nut torque can break studs, damage
threads, and crack discs in the stud hole area.
Use the recommended torque values, and follow
the sequence shown in
When checking wheel nuts on a dual disc assembly,
remove one outer nut at a time, tighten the inner nut,
then reinstall the outer nut. Repeat this procedure for
all wheel nuts, using the sequence shown in
Wheel Fastener Torque
Description
Nut Size
Wheel Manufacturer
Torque (dry threads):
lbf·ft (N·m)
8-Stud Disc Wheel With Two-Piece Flanged Locknuts
Front and Rear Wheel Nut
—
All
450–500 (610–680)
*
10-Stud Disc Wheel With Two-Piece Flanged Nuts
Front and Rear Wheel Nut
M22 x 1.5
Budd (Uni–Mount 10)
390–440 (530–600)
*
10-Stud Disc Wheel With Inner and Outer Locknuts
Front Wheel Nut
1-1/8–16
Alcoa
400–500 (540–680)
All Others
450–500 (610–680)
Rear Wheel Inner Nut
3/4–16
Alcoa
400–500 (540–680)
All Others
450–500 (610–680)
Rear Wheel Outer Nut
1-1/8–16
Alcoa
400–500 (540–680)
All Others
450–500 (610–680)
Wheel Stud Retainer Nut
3/4–16
All
175–200 (235–270)
Spoke Wheel Rim Nuts
Front Wheel Nut, 5- and 6-Spoke
3/4–10
Gunite and Dayton
200–225 (271–305)
†
Rear Wheel Nut, 5- and 6-Spoke With
Non-Corrugated Channel Spacer
3/4–10
Gunite and Dayton
200–225 (271–305)
Rear Wheel Nut, 5- and 6-Spoke With
Corrugated Channel Spacer
3/4–10
Gunite and Dayton
240–260 (325–350)
*
Torque values given are for lubricated threads.
†
On front axles with over 12,000 lbs (5448 kg) capacity, tighten the wheel nuts 240 to 265 lbf·ft (325 to 359 N·m). Gunite part number W–854 nut with a
phosphate-and-oil coating must be used.
Table 1, Wheel Fastener Torque
Wheels and Tires
40
Heavy-Duty Trucks Maintenance Manual, January 1997
40/1
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
1
2
3
4
5
f400057
05/27/93
1
2
3
4
5
6
7
8
A
B
C
D
A. 8-Stud Disc Wheel
B. 10-Stud Disc Wheel
C. 6-Spoke Wheel
D. 5-Spoke Wheel
Fig. 1, Wheel Nut and Rim Nut Tightening Sequence
f400033a
05/16/94
Fig. 2, Non-Corrugated Channel Spacer
f400031a
1
2
05/30/2006
1.
Corrugated Spacer
2.
Corrugated-Channel
Spacer
Fig. 3, Corrugated Spacers
Wheels and Tires
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Heavy-Duty Trucks Maintenance Manual, January 1997
40/2
Title of Maintenance Operation (MOP)
MOP Number
Driveline Inspecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41–01
Driveline Lubricating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41–02
Driveline
41
Index, Alphabetical
Heavy-Duty Trucks Maintenance Manual, April 1998
41–01 Driveline Inspecting
Before lubricating driveline U-joints and slip joints,
proceed as follows:
CAUTION
Do not over-tighten bearing-cap capscrews or
yoke-strap capscrews. Due to the extreme load
occurring at high-speed rotation, a loose or bro-
ken capscrew at any point in the driveline will
weaken the driveline connection, which could
eventually result in serious vehicle damage.
1.
For each full-round driveline yoke with lockstraps
(see
, Ref. A) check to be sure the lock-
straps are locked. The locking tab must be firmly
locked against a flat side of the capscrew head.
If not locked, tighten the bearing-cap capscrew,
then bend a tab of the lockstrap upwards until it
is firm against a flat side of the capscrew head.
For each full-round driveline yoke with thread-
locking capscrews, tighten the bearing-cap cap-
screws. See
, Ref. B.
For each half-round driveline yoke, tighten the
yoke-strap capscrews. See
, Ref. 6.
Tighten all U-joint bearing cap fasteners to the
torque values given in
Fastener Torque Values
Description
Size
Torque: lbf·ft
(N·m)
Yoke-Strap Capscrew
1/2–20
130 (176)
Bearing-Cap Capscrew
5/16–24
24 (33)
3/8–24
37 (50)
7/16–20
60 (81)
Table 1, Fastener Torque Values
2.
Check each input and output end yoke (see
) for cracks and looseness. Replace
cracked yokes.
If any end yoke can be moved in or out on its
shaft, or can be rocked on its shaft, disconnect
the driveshaft and U-joint from the end yoke,
then check the drive component’s shaft seal for
leakage or other visible damage that may have
been caused by the loose yoke. Replace the
seal if needed, then tighten the end yoke nut.
For torque values, see Group 41 of the
Heavy-
Duty Trucks Service Manual
. If the end yoke is
still loose after tightening the yoke nut, replace
the yoke and yoke nut.
Replace the prevailing torque locknut (end yoke
nut) if it was removed for end yoke replacement,
seal replacement, or any other reason.
3.
Check U-joint assemblies for wear by attempting
to move the driveshaft up and down, and from
side to side. If movement of the U-joint cross in
the bearings can be felt or seen, replace the
complete U-joint.
4.
Check the midship bearing and mounting for
looseness and deterioration by attempting to
move the driveshaft up and down, and from side
to side. If the bearing is loose on its shaft, or
rattles, replace it. If the bearing mount is loose
on the frame, tighten the mounting bolt nuts to
the applicable torque value in the torque tables
in the general information section. Replace the
f410033b
08/13/96
1
1
1
2
2
2
3
4
A
B
A. U-Joint With a Lockplate (for a vehicle built before
April 1, 1994).
B. U-Joint With Self-Locking Capscrews (for a vehicle
built from April 1, 1994).
1.
Capscrew (not self-locking)
2.
Self-Locking Capscrew
3.
Adhesive Band
4.
Lockplate
Fig. 1, Bearing Cap Capscrews
Driveline
41
Heavy-Duty Trucks Maintenance Manual, April 1998
41/1
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