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 or motor, 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 cannot 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 U-joint capscrews; see
Table 1 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
Table 1.
For half-round yokes with bearing straps , tighten
the bearing-strap capscrews following the tight-
ening sequence shown in
Fig. 1, in increments
of 20 lbf·ft (25 N·m) to the torque specifications
listed in
Table 1.
3. Check the driveline yokes for cracks, and check
end-yokes for looseness; see
Fig. 2.
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 400 of the 108SD
and 114SD Workshop Manual for torque specifi-
cations. 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 108SD and 114SD
Workshop Manual for torque specifications. Re-
place the midship bearing assembly if the rubber
cushion is deteriorated or oil-soaked.
12/16/2008 f410529
2
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
108SD and 114SD Maintenance Manual, September 2015 41/1
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