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. If bearing is insulated, be sure to replace it with another insulated bearing.

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 and 580 Frames (See Figure 5)

1.Check replacement bearings for nicks or shipping damage. Do not scrape.

2.Remove the upper half of the bearing bracket. NOTE: For 500 frame, WPII motors, the upper top enclosure must be removed before disassembly of the upper bearing bracket.

3.Carefully remove the top half of the bearing capsule by first lifting straight up, then pulling away from the bearing area. NOTE: The floating oil seals may remain in place during the replacement of the bearing bushing.

4.Remove the top half of the bearing bushing.

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 bushing.

9.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. Carefully line up the anti-rotation key on the oil seals with the keyseat on 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 5. Sleeve Bearing Construction with Floating

Type Oil Seals - 500 and 580 Frames

680 and 800 Frames (See Figure 6)

1.Check replacement bearings for nicks or shipping damage. Do not scrape.

2.Remove the upper half of the bearing enclosure (bracket).

3.Loosen the inner and outer oil guards and displace them axially a small amount so as to free upper half of bearing capsule.

4.Remove the upper half of the bearing capsule.

5.Remove the top half of the bearing bushing.

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 bushing.

10.Reassemble, reversing the steps above. (See MAINTENANCE, SEALING PARTS for proper sealing of this bearing design).

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 6. Sleeve bearing construction with labyrinth-type

oil seals - 680 and 800 Frames.

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