Meritor MM-96147 Maintenance Manual page 73

Table I: Premature Wear
Condition
Low mileage universal joint wear End yoke cross hole misalignment
Repeat universal joint wear
End galling of cross trunnion and
bearing assembly
END
GALLING
TRUNNION
4001860a
Needle rollers brinelled into
bearing cup and cross trunnion
UNIVERSAL
JOINT
TRUNNION
4001861a
Spalling of needles into trunnion
Broken cross and bearing
assemblies
TYPICAL SHOCK
FAILURE —
CROSS DAMAGE
4001862a
(16579)
Printed in USA
Cause
Excess angularity
Incorrect or inadequate lubrication
Worn or damaged seals
Excessive continuous running load
Continuous operation at high angle/
high speed
Worn or damaged seals
Incorrect or inadequate lubrication
Excessive angularity
Excessive torque load for universal
joint and driveline size
Incorrect or inadequate lubrication
Excessive continuous running load
Continuous operation at high angle/
high speed
Insuffi cient operating angles
Normal bearing wear
Incorrect or inadequate lubrication
Incorrect or inadequate lubrication
Dirt contamination
Normal bearing wear
Excessive torque load for universal
joint and driveline size
Copyright Meritor, Inc., 2021
Correction
Use an alignment bar to check for end yoke cross hole
misalignment. Replace the end yoke if misaligned.
Check the universal joint operating angles. Reduce the angles if
necessary.
Lubricate according to specifi cations (non-RPL designs).
Replace the universal joint kit.
Replace with a higher capacity universal joint and driveline.
Replace with a higher capacity universal joint and driveline.
Check the universal joint operating angles. Reduce the angles if
necessary.
Replace the universal joint kit.
Lubricate according to specifi cations (non-RPL designs).
Check the universal joint operating angles. Reduce the angles if
necessary.
Replace with a higher capacity universal joint and driveline.
Lubricate according to specifi cations (non-RPL designs).
Replace with a higher capacity universal joint and driveline.
Replace with a higher capacity universal joint and driveline.
Check the universal joint operating angles. Reduce the angles if
necessary.
Increase the operating angles to a minimum of two degrees.
Replace worn components.
Lubricate according to specifi cations (non-RPL designs).
Lubricate according to specifi cations (non-RPL designs).
Replace worn components.
Replace worn components.
Replace with a higher capacity universal joint and driveline.
13 Troubleshooting
MM-96147 / Revised 03-21
Page 73