Universal Joints - Meritor MM-96147 Maintenance Manual

4 Inspection
Fig. 4.2 Flange-Style Driveline
• If the input and output end yokes or fl anges are
loose: Disconnect the driveline. Tighten the retaining
nut or bolt to the correct specifi cation. Refer to the axle
or transmission manufacturer for correct inspection and
replacement procedures.
• If the input and output end yokes or fl anges are not
loose, check that the transmission output shaft and
axle input shaft splines aren't loose at the end yoke
or fl ange: Hold the yoke or fl ange with one hand and
rotate it LEFT-TO-RIGHT while you check end play for radial
looseness. Figure 4.1 and Figure 4.2.
• If you fi nd excessive radial looseness: Replace the end
yoke or fl ange, or input or output shafts, as necessary.
3. Inspect for worn, damaged, missing and loose parts. Replace
as required. Refer to the appropriate sections in this manual
for these procedures.
DANGER
Use a fi ne-tooth fi le or an emery cloth to remove raised metal
or fretting from yoke or fl ange cross hole surfaces. Take care
not to remove an excessive amount of metal. These conditions
can damage the cross and bearing and cause the driveline to
separate from the vehicle. Serious personal injury and damage to
components can result.
4. Inspect all end yoke or fl ange cross hole surfaces and bolt
hole threads for damage. Remove raised metal or fretting with
a fi ne-tooth fi le or emery cloth. Figure 4.3.
• If bolt hole threads are damaged: Replace the yoke or
fl ange.
MM-96147 / Revised 03-21
Page 12
4011842a
Fig. 4.3

Universal Joints

Excessive looseness across the ends of the universal joint
bearing cup assemblies can cause imbalance or vibration in the
driveline assembly. Imbalance or vibration can cause component
wear, which can result in separation of the driveline from the
vehicle. Serious personal injury and damage to components can
result.
Use the following procedure to check for looseness across the ends
of the universal joint bearing cup assemblies and trunnions.
1. Hold the INBOARD yoke or fl ange on the driveline with both
hands.
2. Try to move the yoke or fl ange UP-AND-DOWN and SIDE-TO-
SIDE by applying at least 50 pounds (22.7 kg) of force to the
driveline near the universal joints. Figure 4.4 and Figure 4.5.
• If movement is greater than 0.006-inch (0.152 mm):
Replace the universal joint.
Fig. 4.4
Copyright Meritor, Inc., 2021
DANGER
Yoke-Style Driveline
4001838a
4001794a
(16579)
Printed in USA