Siemens Medallion 1200 Instruction Manual download pdf (Page 26)

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Maintenance

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 8. Sleeve bearing construction with

labyrinth-type oil seals-580 Frame.

880, SH400, SH450, and SH560 Frames (See

Figure 9)

1. Check replacement bearings for nicks or

shipping damage. Do not scrape.

2. Carefully remove the bearing housing cap by

first lifting straight up, then pulling away from the

bearing area.

3. Remove top half of bearing liner.

4. Remove the bolts at the split line of the oil ring.

5. Remove bearing temperature probes if so

equipped.

6. Raise the shaft slightly and support it.

7. Rotate the lower bearing half 180° and remove

the lower half of the bearing.

8. 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.

9. Lubricate. Turn motor by hand to be sure of

proper fit and oil ring operation.

10. Start motor without load and check oil ring

operation.

End Float – Sleeve Bearings

Control of rotor end float in sleeve bearing motors is

maintained in the drive end bearing. The total end

float is 0.5 inch. On the 500 and 580 frames the

bearings are located axially by shims between the

bearing bushing and the housing shoulders in the

lower half of the housing. On the 880, SH400,

SH450, and SH560 frames the shims are located

between the bearing housing mounting

flange and the bearing bracket. The shims permit

the bearing

to be adjusted axially to maintain coincidence of

electrical and mechanical center. Any adjustment of

the axial position of one bearing should be

accompanied by the same axial adjustment of the

opposite end bearing.

The coupling should limit the end float of the shaft to

±0.18 inch from the mechanical center. The limited

end float coupling prevents the rotor from rubbing

against the bearing shoulders during operation.

Figure 9. Sleeve Bearing

Construction 880, SH400, SH450,

and SH560 Frames.

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Siemens Medallion 1200 Instruction Manual Page 26

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