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Table L: Yoke or Flange Fracture
Condition
Yoke broken or cracked
4001864a
Table M: Universal Joint Center Parts
Condition
Cross or trunion fracture
Bushing fracture
Table N: Yokes — Wing-Style Bushings
Condition
Loose bolts
Broken bolts
Table O: Yokes — Round Bushings
Condition
Extremely hard to remove or
replace bushing
New center parts will not fl ex
when you install them into the
yoke
(16579)
Printed in USA
Cause
Mating yoke lug interference at full
jounce and rebound
Excessive torque load for universal
joint and driveline size
Bending fatigue due to secondary
couple loads
Cause
Abnormally high loading
Excessive load for universal joint
Excessive angularity
Worn or damaged parts
Cause
Dirt or foreign material, such as
paint, on mounting pad
Over or under torqued bolts
• If there is no fretting on the
mounting pad or bolt hole and
there is fretting on the drive
tang: The bolt broke.
• If there is fretting on the
mounting pad or bolt hole: The
bolt was loose.
Excessive angularity
Cause
Distorted bushing hole in yoke or
normally close clearances, fretting
corrosion and rust build-up
Yoke ears are distorted, causing the
center parts to bind
Copyright Meritor, Inc., 2021
Correction
Replace the yoke. Check the design for application. Use high angle
yokes.
Replace with a higher capacity universal joint and driveline.
Reduce the universal joint continuous running angles.
Correction
Check for abuse of vehicle, stuck or overloading.
Check for maximum driveline torque in lowest gear. If necessary,
replace with a higher capacity universal joint and driveline.
Check the universal joint operating angles. Reduce the angles if
necessary.
Replace with new parts.
Correction
Check for fretting on the mounting pads or drive tang.
Surfaces must be free of foreign material and the bushings must be
fully seated before bolts are fully tightened.
Surfaces must be free of foreign material and the bushings must be
fully seated before bolts are fully tightened.
Check the universal joint operating angles. Reduce the angles if
necessary.
Correction
When you remove a bushing, use a penetrating oil and be careful
not to distort the ears on the yoke when you hammer on the center
cross. Remove grease, rust and dirt from the mounting surfaces
before assembly. Apply NeverSeez to make disassembly easier.
Replace the yoke.
13
Troubleshooting
MM-96147 / Revised 03-21
Page 75
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