GEH-5304A

C.Bearings

Ball bearing and roller bearing housings are packed with grease at the factory. Therefore, greasing is not required before the motor is put into service. Since the oil in the grease will ultimately become depleted, it is necessary to relubricate ball bearing and roller bearing motors periodically, depending on the size and type of service (refer to Table 9).

Avoid mixing different kinds of grease. Lubricate the motor at standstill. Make sure the top grease fitting is clean and free from dirt. Remove one of the lower grease relief plugs. Free the relief hole from any hard- ened grease. Use a hand-operated grease gun only. Pump in grease until new grease appears at lower grease hole. After greasing, allow the motor to run about ten minutes before replacing the grease relief plug to permit excess grease to drain out.

Extreme pressure (EP) greases should not be used in DC machines. Insulation deterioration and increased brush wear may result from the presence of sili- cones.

D.Replacement of Bearings

After the bearing brackets have been removed, a bearing puller may be used to pull the bearings from the shaft. Protect the shaft center while using the puller. Discard the old bearing. The new bearing and all mating parts should be kept extremely clean during reassembly.

To install a new bearing, heat the bearing to 116-127°C (240-260°F) in oil or in an oven, then slip or press the bearing on the shaft. The bearing should be mounted tightly against the shoulder on the shaft.

After the bearing has cooled, reinstall the retaining ring where used. Fill the grease reservoir in the inner bearing cap or cartridge 1/3 to 1/2 full of grease, butter the bearings and fill the grease reservoir in the bear- ing bracket 1/3 to 1/2 full of grease.

Table 9

Recommended Regreasing Periods

Frame

Size

CD2512AT- CD2813AT

Average

RPM

500

1150

1750

3000

Relubrication

Interval In Hours

Of Operation

BallRoller

Bearing Bearing

36000 18000

150007500

100005000

50002500

Frame

Size

25XX

28XX

Table 10

Standard Bearings for CD2512AT-CD2813AT Motors

Commutator End

 

 

Drive End

 

 

Standard Ball

Standard Ball

Oversize Ball

Oversize Roller

Basic

 

Basic

 

Basic

 

Basic

 

Brg. No.

AFBMA

Brg. No.

AFBMA

Brg. No.

AFBMA

Brg. No.

AFBMA

307

35BC03X3

309

45BC03X3

310

50BC03X3

310

50RU03X3

309

45BC03X3

310

50BC03X3

311

55BC03X3

311

55RU03X3

21

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GE GEH-5304A manual Replacement of Bearings, Recommended Regreasing Periods, Frame Size CD2512AT- CD2813AT Average
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GEH-5304A specifications

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