Siemens 680 User Manual download pdf (Page 23)

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Maintenance

Bearing Replacement

Antifriction Bearings

For typical antifriction bearing configuration, see

Figure 3.

Replacement bearings may be of a different

manufacturer but must be equal to the originals used in

the motor. When ordering bearings specify as follows:

1. The complete A.F.B.M.A. (Anti-Friction Bearing

Manufacturers’ Association) bearing number from

the motor nameplate.

2. Identifying numerals and manufacturer stamped on

the bearing.

3. Bearing tolerance class, i.e. - A.B.E.C.-1 (Annular

Bearing Engineers’ Committee Tolerance Class

One).

4. Internal radial clearance, i.e. – A.F.B.M.A.-3

(Clearance Class Three).

5. Electric motor quality.

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 4.

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.

Grease Quantity*

(End Caps)

Type

Bearing

Operating

Bearing

(Shaft)

Outer Inner

Deep Groove

Ball

Horizontal 2/3 Full 1/3 Full

Roller Horizontal 1/3 Full 1/3 Full

*Pack all open bearings full between balls or roller but remove

excess grease on outside of retainers.

Figure 3. Ball Bearing Construction

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 4. Removing Bearing with a Puller

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