Meritor MM-96147 Maintenance Manual page 72

13 Troubleshooting
5. Use a dial indicator to examine the slip yoke spline for
excessive radial movement. Radial movement between the
slip yoke and the tube shaft must not exceed 0.017-inch
(0.432 mm).
• If the radial movement exceeds 0.017-inch
(0.432 mm): Replace the slip yoke and the tube shaft.
6. Inspect the driveline for damage or bent tubing.
• If the driveline is damaged or bent: Repair the driveline
at a reputable driveline repair facility.
Table H: Vibration
Condition
Driveline vibration
Low gear shudder at full drive
or full coast under light load
conditions
MM-96147 / Revised 03-21
Page 72
Cause
Driveline phasing incorrect
Missing balance weights or foreign
material on driveline tubing
Transmission or axle end yokes loose Inspect for radial looseness. Tighten the nut or replace the end
Excessive end play in universal joints Replace the universal joints.
Excessive hinging in slip section
Welch plug loose or missing in slip
yoke
Worn center bearing
Chassis ride height too low or too
high
Torsional accelerations in driveline
Loose, missing or damaged driveline
fasteners or parts
Incorrect phasing
Driveline weight incompatible with
engine-transmission mounting
Driveline too long for speed
Loose outside diameter fi t on slip
yoke spline
Universal joint loose
Driveline out of balance or bent
Worn universal joint
Torsional or inertial excitation
Copyright Meritor, Inc., 2021
7. If necessary, carefully remove mud or road debris from the
driveline.
8. Inspect the slip yoke spline seal for grease leakage or seal
damage.
9. Inspect for missing balance weights, damaged tubing or a
missing welch plug at the slip yoke.
For second order drivetrain vibration, refer to "Measure Driveline
Angles" in Section 14.
Correction
Correct the phasing by aligning the yokes on both ends of the
driveline.
Have the driveline balanced.
yoke.
Replace worn components.
Replace the welch plug or slip yoke.
Replace the center bearing.
Readjust the ride height.
Measure the transmission, driveline and axle planes. Record the
readings and run the Driveline Analysis Program.
If the angles are found to be out of specifi cations, adjust or replace
components as directed.
Tighten loose fasteners, and replace damaged and missing parts.
Reassemble with correct phasing.
Install a two-piece driveline with a shaft support bearing.
Install a two-piece driveline with a shaft support bearing.
Change the slip yoke and spline plug.
Inspect the universal joint for looseness; tighten to specifi cation.
Replace if necessary.
Rebalance or replace.
Replace the universal joint.
Reduce the universal joint continuous running angle by adding
shims to driveline components.
(16579)
Printed in USA