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Bearing Replacement (Eccentric
Self-Locking Collar)
Bearings with eccentric self-locking collars are used on
several shafts and are held in position on the structure
with bearing flanges.
FIG. 33: The bearing (1) is held in position on the shaft
by a locking collar (2). The locking collar has an eccentric
counterbore. This counterbore engages the eccentric end
of the bearing inner race (3) when the bearing is
assembled. The locking collar is rotated on the bearing to
lock the assembly on the shaft. The assembly grips the
shaft tightly with a positive locking action that increases
with use. A set screw (4) in the locking collar applies
additional locking pressure.
To replace a bearing:
•
Loosen the set screw.
•
Use a drift punch inserted in the drift pin hole (5) to
rotate and loosen the locking collar. Rotate the
locking collar opposite the direction of normal shaft
rotation. Remove the locking collar.
•
Support the shaft. Remove the bolts for the bearing
flanges.
•
Slide the bearing and the bearing flanges from the
shaft.
NOTE: Removing paint and corrosion from the shaft will
make removal easier.
•
Put the bearing and bearing flanges on the shaft.
Make sure the bearing inner race is turned in the
correct direction.
•
Install the bolts for the bearing flanges. Make sure the
bearing is straight within the bearing flanges. Tighten
the bolts evenly.
•
Put the locking collar on the shaft. Push the locking
collar against the bearing inner race. Rotate the
locking collar in the direction of normal shaft rotation
until tightly engaged. Tighten the locking collar by
hitting with a drift punch inserted in the drift pin hole.
NOTE: Always tighten the locking collar in the direction of
normal shaft rotation.
•
Tighten the set screw in the locking collar. Use the
following chart for set screw torque.
Set Screw Size
Nm
1/4-20
5/16-18
3/8-16
7/16-14
•
If a bearing is replaced on the other end of the shaft,
repeat this procedure for the other bearing.
4283399M1
Ibf in
4.8
78
18
156
31
273
49
428
General Information
3
5
1
FIG. 33
4
2
L97A-0297
01-23
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