Ge GEH-5304A User Manual download pdf (Page 21)

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

Relubrication

Interval In Hours

Of Operation

Frame Average Ball Roller

Size RPM Bearing Bearing

CD2512AT- 500 36000 18000

CD2813AT 1150 15000 7500

1750 10000 5000

3000 5000 2500

Table 10

Standard Bearings for CD2512AT-CD2813AT Motors

Commutator End Drive End

Standard Ball Standard Ball Oversize Ball Oversize Roller

Frame Basic Basic Basic Basic

Size Brg. No. AFBMA Brg. No. AFBMA Brg. No. AFBMA Brg. No. AFBMA

25XX 307 35BC03X3 309 45BC03X3 310 50BC03X3 310 50RU03X3

28XX 309 45BC03X3 310 50BC03X3 311 55BC03X3 311 55RU03X3

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 44 45

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Ge GEH-5304A User Manual Page 21