Freightliner Coronado 132 / 122SD. Manual — part 21
40–01 Wheel Nut Check
IMPORTANT: After a wheel has been installed,
the wheel nut torque must be rechecked after
50 to 100 miles (80 to 160 km) of operation.
See
for disc wheel nut torque specifications,
and see
for the wheel nut tightening se-
quence.
NOTICE
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 tightening sequence shown in
When checking stud-piloted rear dual disc wheels
with inner and outer nuts, remove one outer nut at a
time, tighten the inner nut, then reinstall and tighten
the outer nut. Repeat this procedure for all wheel
nuts, using the tightening sequence shown in
Disc Wheel Fastener Torques
Description
Nut Size
Wheel Manufacturer
Torque: lbf·ft (N·m)
10-Hole and 8-Hole Hub-Piloted Disc Wheel With Two-Piece Flange Nuts
*
Front and Rear Wheel Nut
M22 x 1.5
All
450–500 (610–678)
10-Hole Stud-Piloted Disc Wheel With Inner and Outer Nuts
†
Front Wheel Nut
1-1/8–16
All
450–500 (610–678)
Rear Wheel Inner Nut
3/4–16
All
450–500 (610–678)
Rear Wheel Outer Nut
1-1/8–16
All
450–500 (610–678)
*
Torque values for hub-piloted wheels are given for lubricated threads. Lubricate threads with SAE 30W engine oil. Do not apply thread lubricant to ball seats
of the nuts and wheels. Wipe it off if it is applied accidentally.
†
Torque values for stud-piloted wheels are given for clean, dry threads.
Table 1, Disc Wheel Fastener Torques
40–02 Tire Check
Tires should be inspected closely during the first
3000 to 10,000 miles (5000 to 16 000 km) for abnor-
mal wear.
Maintain the proper pressures for carried loads, per
the tire manufacturers’ recommendations, or the tire
pressure label on the driver’s door.
Have the wheel alignment checked after the first
10,000 miles (16 000 km), then every 40,000 miles
(60 000 km) thereafter.
Do not continue to drive the vehicle if tires develop
any of the following:
• blisters;
• cuts or punctures that reach to the cord;
• a nail, screw, rock, or other puncturing object;
• flat spots or irregular wear;
• tread worn to a minimum depth;
• inability to maintain proper tire pressure.
09/18/2001
A
B
f400164
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10
8
6
3
5
4
9
2
7
1
2
4
6
7
5
8
3
A. 8-Stud Disc Wheel
B. 10-Stud Disc Wheel
Fig. 1, Wheel Nut Tightening Sequence
Wheels and Tires
40
40/1
Title of Maintenance Operation (MOP)
MOP Number
Driveline Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41–01
Driveline Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41–02
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41–00
Driveline
41
Index, Alphabetical
41–00 Safety Precautions
Safety Precautions in this section apply to all
procedures within this group.
DANGER
When working on the vehicle, shut down the en-
gine, set the parking brake, and chock the tires.
Before working under the vehicle, always place
jack stands under the frame rails to ensure the
vehicle can not drop. Failure to follow these steps
could result in serious personal injury or death.
41–01 Driveline Inspection
1.
Park the vehicle on a flat, level surface, apply
the parking brakes, and chock the tires.
WARNING
Self-locking bearing-cup or bearing-strap cap-
screws must not be reused; replace the cap-
screws with new ones. Also, do not undertighten
or overtighten any bearing-cup or bearing-strap
capscrews. A loose or broken fastener at any
point in the driveline weakens the driveline con-
nection, which could cause serious vehicle dam-
age, or could result in a driveshaft separating
from the vehicle, possibly causing loss of vehicle
control that could result in serious personal injury
or death.
2.
Check the torque of the bearing-cup or bearing-
strap capscrews; see
for installed torque
values.
Remove and discard any loose capscrews. Do
not reuse any loosened self-locking capscrews;
they are designed for one-time installation only.
Replace all loosened and removed capscrews
with new ones. Tighten the new capscrews as
specified in
For half-round yokes with bearing straps , tighten
the bearing-strap capscrews following the tight-
ening sequence shown in
, in increments
of 20 lbf·ft (25 N·m) to the torque specifications
listed in
Bearing Cap or Bearing Strap Capscrew Torque
Specifications
U-Joint Type
Torque: lbf·ft (N·m)
Half-Round Yokes with Bearing
Straps and 3/8-inch Capscrews
(see
, Ref. 8)
45–60 (60–80)
Half-Round Yokes with Bearing
Straps and 1/2-inch Capscrews (
, Ref. 8)
130–135 (175–185)
Full-Round Yokes with Bearing
Cups (
43 (58)
RPL Series U-Joints with
Bearing Cups (
125 (169)
Table 1, Bearing Cap or Bearing Strap Capscrew
Torque Specifications
3.
Check the driveline yokes for cracks, and check
end-yokes for looseness; see
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 yoke, then
check the drive component’s shaft seal for leak-
age or other visible damage that may have been
caused by the loose yoke. Replace the seal if
needed, then tighten the yoke nut. Refer to Sec-
tion 41.00, Specifications 400of the 122SD and
Coronado Workshop Manual for torque specifica-
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1
2
1
Tighten the capscrews in a counterclockwise sequence,
starting with either number 1 position.
Fig. 1, Tightening Sequence, Half-Round Yoke Bearing
Strap Capscrews
Driveline
41
41/1
tions. If the yoke is still loose after tightening the
yoke nut, replace the end-yoke and yoke nut.
Replace the prevailing torque locknut (end-yoke
nut) if it was removed for yoke replacement, seal
replacement, or any other reason.
4.
Check U-joint assemblies for wear by moving the
driveshaft up and down, and from side to side. If
any movement of the U-joint cross in the bear-
ings can be felt or seen, replace the U-joint as-
sembly.
5.
Check if the midship bearing and mounting are
loose or have deteriorated, 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 fasteners to
the proper torque value. See Section 41.00,
Specifications 400 of the 122SD and Coronado
Workshop Manual for torque specifications. Re-
place the midship bearing assembly if the rubber
cushion is deteriorated or oil-soaked.
f410067b
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2
3
3
05/01/95
4
5
6
7
8
9
10
11
12
13
14
15
16
NOTE: Not all fasteners are shown.
1.
Transmission
2.
Transmission Output-Shaft
End-Yoke (half-round)
3.
U-Joint Assembly
4.
Bearing Plate Self-Locking
Capscrew
5.
Bearing Cup (for full-round
yoke)
6.
U-Joint Cross
7.
Bearing Cup (for half-round
yoke)
8.
Bearing Strap and Bearing-
Strap Capscrew
9.
Slip-Joint Assembly
10. Sleeve-Yoke (full-round)
11. Dust Cap
12. Splined Stub Shaft
13. Driveshaft Tube
14. Tube-Yoke (full-round)
15. Axle Input-Shaft End-Yoke
(half-round)
16. Rear Axle
Fig. 2, Components of a Basic Driveline
Driveline
41
41/2
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