Siemens 680 User Manual download pdf (Page 25)

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Maintenance

Sleeve Bearing

1120 Frame (See Figure 7)

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,

disengage the dowels, and remove 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 liner.

8. Reassemble, reversing the steps above. Apply

sealant. (See MAINTENANCE, SEALING PARTS

for proper sealing of this bearing design).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, 580, 680 and 800

frames, the bearings are located axially by shims

between the bearing bushing and the bearing capsule

shoulders . On the 1120 frame, 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 7. Sleeve Bearing Construction

1120 Frame.

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Siemens 680 User Manual Page 25

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