Maintenance

Sealing Parts

Even though joints may seem to match perfectly, minute clearances exist through which oil may leak. Sealant should be applied to the mating surfaces of parts where oil is present to prevent seepage of oil.

Sealant should be applied as follows:

1.Surfaces shall be clean of dirt, grease, and oil sealant. Use a non-oil base solvent if necessary.

2.The mating surfaces should be flat with no nicks or burrs raised above the surface. There should be no gap when mating surfaces are together. Remove all excess paint from parting line

surfaces and degrease thoroughly. Do not grind mating surfaces.

3a. For 500, 708, 788, and 880 frames, apply a small bead of silicone RTV at the bearing housing parting surfaces. Loctite 518 may be used in replace of RTV in environments where silicon is prohibited. Do not apply too much sealant as excess will be squeezed out and get into labyrinth seals, bearing, oil cavities, etc. Apply a uniform, thin layer (about 0.05" thick) of Curil T* to the floating oil seal surfaces that mate with the bearing housing. Allow Curil T to cure on the seals for 15 minutes before insertion into bearing housing.

3b. For 580 frames, apply a small bead of silicone RTV to all mating surfaces of parts where oil is present, including fixed oil seals and bearing housing parting lines.

4. Assemble parts.

*CURIL-T may be ordered through Siemens Customer Service in Norwood, Ohio. Part number 53-688-487-001 should be used for ordering purposes.

Bearing Lubrication

Grease Lubricated Antifriction Bearings

NOTE

A common mistake is over-lubrication of bearings. When grease is added without removing the drain plug, the excess grease may be forced into and through the inner bearing cap and thrown on to the windings. If bearing is over-lubricated, bearing could run hot, and may lead to failure.

All antifriction bearing motors will have an affixed plate with lubricating instructions. The instructions on this plate should be followed to achieve optimum bearing life and to avoid consequential damage to rotating parts.

The frequency of lubricating bearings depends on three factors - speed, type of bearing, and service.

Operating environment or application may dictate more frequent lubrication.

Lubricate with the type of grease specified on the lubrication plate mounted on the motor, or a compatible grease. Mixing of non-compatible greases can cause bearing failure.

Higher stator temperatures will result in increased bearing temperatures. Bearing temperatures should not exceed the limits as stated in Typical Motor Control Settings. For specific recommendation, consult factory.

Procedure for Lubrication:

1.Stop the motor and lock out the switch.

2.Thoroughly clean the grease inlet fitting or plug. If the motor has plug, remove plug and clean the inlet.

3.Remove the drain plug and clean out any hardened grease.

4.Slowly pump the correct amount of grease into the grease inlet, per the lubrication plate mounted on the motor.

5.Start motor and allow to run at least one (1) hour to expel any excess grease from the drain opening before re-installing the drain plug.

6.Stop the motor and lock out the switch.

7.Re-install the drain plug.

8.Put the motor back in operation.

The amount of grease for bearings may be calculated by the following:

 

G = 0.1 x D x B

Where:

G = Amount of grease in fluid ounces

 

D = Outside diameter of bearing in inches

 

B = Width of bearing in inches

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