Section 4: Inspection; Driveline; End Yokes Or Flanges - Meritor MM-96147 Maintenance Manual

Inspection
Hazard Alert Messages
Read and observe all hazard alert messages in this publication.
DANGER
Park the vehicle on a level surface. Block the wheels to prevent
the vehicle from moving. Support the vehicle with safety stands.
NEVER work under a vehicle supported only by jacks. Jacks can
slip and fall over. Failure to use a jack stand can result in serious
personal injury and damage to components.
DANGER
Check end yoke retaining nuts and bolts for looseness. Tighten
loose fasteners to specifi cation. Check the input and output shaft
splines for wear and damage. Replace worn or damaged splines.
Check for loose, missing or damaged driveline fasteners and
parts. Tighten loose fasteners, and replace damaged and missing
parts. Loose, damaged or missing parts can cause the driveline
to separate from the vehicle. Serious personal injury and damage
to components can result.
DANGER
Only service a driveline when the engine is OFF. A rotating
driveline can cause serious personal injury.
WARNING
To prevent eye injury, always wear eye protection when
performing vehicle maintenance or service.

Driveline

1. Park the vehicle on a level surface. Block the wheels to keep
the vehicle from moving. Raise the vehicle so that the area
you will service is off the ground.
2. Inspect the driveline at regular intervals. Loose end yokes,
excessive radial movement, slip spline radial movement, bent
driveline tubing or missing plugs in the slip yoke can damage
universal joints and bearings.
3. Check the output and input end yokes on both the
transmission and axle for axial looseness. Refer to the axle or
transmission manufacturer's service instructions.
• If the output and input end yokes or fl anges are
loose: Disconnect the driveline. Tighten the retaining nut to
the correct specifi cation. Refer to the axle or transmission
manufacturer's service instructions.
(16579)
Printed in USA
4. Inspect for worn universal joints. Apply vertical force of about
50 pounds (22.7 kg) to the driveline near the universal joints.
• If movement is greater than 0.006-inch (0.152 mm):
Replace the universal joint.
5. Inspect the slip section to ensure the welch plug and dust seal
(under the shroud) are in the correct position.
6. Inspect the driveline for damaged or bent tubing. Carefully
remove contaminants, such as mud and road debris.

End Yokes or Flanges

Perform the following procedures before you lubricate universal
joints or slip yokes. If you lubricate these components before you
inspect them, lubricant can conceal wear, damage and looseness.
1. Inspect all input and output end yokes or fl anges for gaps
between mating surfaces.
• If gaps are present: Refer to the transmission, axle or
transfer case manufacturer's service instructions.
2. Use the following procedure to check all input and output end
yokes or fl anges for looseness.
a. Hold the end yoke or fl ange with both hands.
b. Move the end yoke UP-AND-DOWN and SIDE-TO-SIDE.
There shouldn't be any movement where the yoke or fl ange
connects to the input and output shafts. Figure 4.1 and
Figure 4.2.
Fig. 4.1 Yoke-Style Driveline
Copyright Meritor, Inc., 2021
4 Inspection
4001796a
MM-96147 / Revised 03-21
Page 11