GE GEH-5304A User Manual
GEH-5304A
21
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).
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.
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.
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.
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.
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