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Driveline
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.
CAUTION
Due to the extreme load occurring at high-speed
rotation, a loose or broken capscrew at any point
in the driveline will weaken the driveline connec-
tion, which could eventually result in serious ve-
hicle damage. Do not over-tighten bearing-cap
capscrews or yoke-strap capscrews.
2. For driveline universal joints with bearing caps,
tighten bearing-cap capscrews 43 lbf·ft (49 N·m).
See
Fig.
1, item 1.
For RPL series universal joints, tighten bearing-
cap capscrews 125 lbf·ft (169 N·m). See
For driveline universal joints with yoke straps,
tighten yoke-strap capscrews 125 lbf·ft (169
N·m). See
Fig.
3.
3. Check the driveline yokes for cracks, and check
end-yokes for looseness. See
Have any cracked yokes replaced by an autho-
rized Western Star dealer.
If any end-yoke can be moved in or out on its
shaft, or can be rocked on its shaft, take it to an
authorized Western Star dealer for service.
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, have the U-joint assem-
bly replaced.
Western Star Maintenance Manual, September 2015
Fig.
2.
Fig.
3.
1
04/13/98
1. Self-Locking Capscrew
2. Adhesive Band
Fig. 1, Meritor U-Joint Fasteners for Bearing Caps
12/09/97
Fig. 2, Meritor RPL Series U-Joint
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, have it replaced. If the bearing mount is
loose on the frame, have your Western Star
dealer tighten the mounting fasteners to the
proper torque value. Have the midship bearing
assembly replaced if the rubber cushion is dete-
riorated or oil-soaked.
6. Check slip joints for spline wear by moving the
sleeve-yoke and splined shaft back and forth.
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