Siemens CGZ - Manual (Page 24)

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Maintenance
Sleeve Bearing
When replacing sleeve bearings, it is always desirable
to check the fit (contact pattern) of the bearing to the
shaft. When ordering sleeve bearings, be sure to
provide complete motor nameplate and bearing data.
Whenever a bearing is replaced, cleanliness must be
observed through every step of the operation.
Always inspect the bearing journal surfaces; they must
be smooth and polished. Slight scoring can be
removed with crocus cloth. If the motor shaft has been
seriously scored it must be put between centers and
reground. Journals can be ground 0.001 inch under
size, but they must be round and concentric with shaft
center.
Sleeve Bearing Replacement
The replacement of sleeve bearings can often be
accomplished without uncoupling the load or otherwise
disturbing the installation.
500 Frame (See Figure 6)
1. Check replacement bearings for nicks or shipping
damage. Do not scrape.
2. Remove the upper half of the bearing bracket.
3. Carefully remove the top half of the bearing
capsule by first lifting straight up, then pulling
away from the bearing area.
4. Remove the top half of the sleeve bearing.
5. Remove bearing temperature probes if so
equipped.
6. Displace the oil rings axially away from the bottom
half of the sleeve bearing.
7. Raise the shaft slightly and support it.
8. Rotate the lower bearing half 180° and remove the
lower half of the bearing.
9. Reassemble, reversing the steps above. Apply
sealant. The side faces of the labyrinth seals must
be sealed with CURIL-T or equivalent non-
hardening sealing compound. Be careful not to
disturb or jam the seals when replacing the upper
half of the bearing capsule.
10. Lubricate. Turn motor by hand to be sure of proper
fit and oil ring operation.
11. Start motor without load and check oil ring
operation.
Figure 6. Sleeve Bearing Construction with Floating
Type Oil Seals-500 Frame
580 Frame (See Figure 7)
1. Check replacement bearings for nicks or shipping
damage. Do not scrape.
2. Loosen outer oil seal and remove.
3. Remove the two long bolts (2:00 and 10:00 o’clock
positions) that go through to the inner oil seal.
4. Remove the upper half of the bearing capsule.
5. Remove the top half of the sleeve bearing.
6. Remove bearing temperature probes if so
equipped.
7. Displace the oil rings axially away from the bottom
half of the sleeve bearing.
8. Raise the shaft slightly and support it in that
position.
9. Rotate the lower bearing half 180° and remove the
lower half of the bearing.
10. Reassemble, reversing the steps above. Apply
RTV silicon rubber or Permatex #2 sealant.
11. Lubricate. Turn motor by hand to be sure of proper
fit and oil ring operation.
12. Start motor without load and check oil ring
operation.
Figure 7. Sleeve bearing construction with labyrinth-type
oil seals-580 Frame.
Maintenance