Siemens 880 Installation Operation & Maintenance page 23

Maintenance
To Replace Antifriction Bearings
1. Remove bolts holding end caps to housings.
2. Remove bolts holding bearing housings to yoke.
3. Remove bearing housings.
4. Remove the bearing with a puller. See Figure 5.
5. Check shaft and housing diameter for proper size
with micrometer.
6. Heat the new bearing in an oven (200°F). While
it is hot, slide the bearing onto shaft – make
certain that the inner race makes a firm even
contact with shaft shoulder. Do not subject
bearing to impact.
7. Let bearing cool - pack bearing caps with the
proper grease.
8. Reassemble end caps and housings.
The amount of grease to be used when repacking a
bearing after cleaning or replacement is shown in the
table below:
Operating
Type
Bearing
Bearing
(Shaft)
Deep Groove
Horizontal
Ball
Roller Horizontal
*
Pack all open bearings full between balls or roller but remove
excess grease on outside of retainers.
Figure 3. Ball Bearing Construction
500, 580 and 708 Frames
Grease Quantity*
(End Caps)
Outer Inner
2/3 Full 1/3 Full
1/3 Full 1/3 Full
- 22 -
Figure 4. Ball Bearing Construction
788 and 880 Frames
NOTE
1. For best results, seal should be positioned
flush with outer-most
surface. (Some frame sizes have shaft seal
on only one end of the motor)
2. U.L. listed motors have special requirements.
Assembly must be by U.L. certified shop or
inspected by U.L.
Consult factory for U.L. listed motors.
Protect the shaft end with a cap. If bearing is reusable,
make certain the puller applies pressure against the
bearing inner race only. If puller will not hook the bearing
inner race, fabricate a split bushing and install it between
the bearing and the puller hooks.
Figure 5. Removing Bearing with a Puller
bearing housing