Installation and Maintenance Manual

GEI-M1031-B
16
V. MAINTENANCE (cont’d)
C. Lubrication and Bearings (cont’d)
2. Recommended Regreasing Procedure and Frequency (cont’d)
Because this method of greasing anti-friction bearings tends to purge the housing of
used grease over a period of time, removal of all grease should be required infrequently.
A GE authorized Service Shop can clean the bearing cavity and replace the bearings and
grease when the motor is removed from service for maintenance or reconditioning.
D. Anti-Friction Bearing Maintenance
1. Removal
Even though high-quality design and workmanship are incorporated in a bearing, it
sometimes becomes necessary to remove the bearing for maintenance.
a. Remove bolts securing fan cover.
b. Remove the snap ring that secures the fan to the shaft extension.
c. Remove the fan from the shaft extension by employing a gear puller.
d. If the motor has bearing caps, remove the hex head bearing cap screws, adjacent to
the motor hub, which hold the bearing caps (both ends).
e. Remove the hex head bolts on the outer flange of the end-shields, which hold the
end shields on the frame.
f. Carefully pull out the rotor, being careful not to damage any of the windings or
machined surfaces.
g. If it is desirable to reuse the bearing, apply a bearing puller to the inner ring.
Recommended Regreasing Frequency
Type of
Service
Typical Examples
HP Range
Lubrication Interval (Years)
Horizontal Mount
Easy
Valves, door openers, portable floor sanders, motor
operating infrequently (one hour per day)
50 – 100
200 – 350
4
3
Standard
Machine tools, air conditioning apparatus, conveyors
(one or two shifts), garage compressors, refrigeration
machinery, oil well pumps, water pumps, wood
working machinery
50 – 100
200 – 350
1.5
1
Severe
Motor for fans, machine tools, M-G sets, etc. (that run
24 hours a day, 365 days a year), coal and mining
machinery, motors subject to severe vibration, steel
mill machinery
50 – 100
200 – 350
9 mo.
6 mo.
Very Severe
Dirty, vibrating applications, where end of shaft is hot
(pumps and fans), high ambient temperature
50 – 100
200 – 350
4 mo.
3 mo.
Care must be taken to avoid scratching
or nicking the critical surfaces of the
balls or rollers.
Extreme care is required in the
disassembly of a machine for bearing
removal. In addition, the shaft bearing
seat and the bearing itself must be protected during
and after disassembly operations.
Caution
Caution