Electric Power Generation
Installation and maintenance
LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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23
NOTE:
The solvent used must be in accordance with local
regulations and environmental standards.
DANGER:
THE PROHIBITED SOLVENTS ARE:
CHLORINATED SOLVENT
(TRICHLORETHYLENE,TRICHLOROETHANE) WHICH
BECOMES ACID.
FUEL-OIL (EVAPORATES TOO SLOWLY).
GASOLINE CONTAINING LEAD
BENZENE (TOXIC).
After cleaning ensure that the bearing becomes perfectly
dry.
Fill the bearing with the new grease.
Re-assemble the cage and the parts, which have been
dismantled, filling them with grease (2/3 of the empty
spaces must be filled with new grease).
Use a grease pump to complete the bearing lubrication
(while machine running).
5.3.3 Cleaning of the bearing assembly area
The bearing service-life depends directly on the cleanliness
of the lubricant. Dirt must not enter or pollute the bearings.
Excess grease must be removed before operation in order
to avoid pollution of the environment as well as the
alternator.
Periodically:
clean the labyrinth seals outside face. Remove any excess
grease which may appear on the shaft.
Remove the excess of dry old grease from the bearing
exhaust channel (use a clean blade).
After removing the old grease, check that a small fresh
volume of grease will plug the exhaust channel (to avoid
pollution coming back to the bearing).
5.3.4 Bearing disassembly
The bearing inner ring is shrink fitted onto the shaft.
The outer bearing race is free, or slightly tightened, on the
hub (depending on the type of bearing). To remove the
bearing from the shaft, it is necessary to use a dedicated
hub-puller to avoid damaging the surface of the shaft.
Typical bearing drawing assembly is given in chapter 10.
CAUTION:
CLEANLINESS IS IMPERATIVE.
NOTE:
Heating the bearing during the pulling operation is
recommended to prevent the shaft from being scored.
5.3.5 Bearing reassembly
A bearing can be reused if it is found to be in perfect
condition. As far as possible, we recommend to use a
brand new bearing.
Before refitting a bearing, carefully clean the surface of the
bearing and the other parts of the bearing.
Measure the shaft diameter to check it is within the
recommended tolerances.
To install the bearing on the shaft, it is necessary to heat
the bearing. The heat source may be an oven or a space
heater (the use of oil baths is not recommended). The use
of an induction bearing heater is recommended.
CAUTION:
NEVER HEAT A BEARING TO MORE THAN 125°C
(257°F).
Push the bearing up to the shaft shoulder, and check after
cooling that the inner ring is still in contact with the
shoulder. Lubricate using the recommended grease. Fill
the bearing covers with new grease.
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