Bearing Lubrication
Bearings fail from both under- and over-greasing — over-lubrication is the more common operator error, not under.
Bearing over-greasing is more common than under-greasing at most plants; forcing excessive grease raises internal friction, heats the bearing, and accelerates failure.
Use the motor manufacturer's grease quantity, typically expressed in grams or strokes of a manual grease gun; record these on a tag attached to the motor.
Grease relief fittings (held closed until the bearing is re-greased, then opened to vent the old grease) help prevent over-greasing — install on high-value motors if they aren't already in place.
Grease compatibility is a real issue: mixing lithium-complex and polyurea greases can soften the grease and turn it to liquid — never introduce a different grease without first relubing the bearing completely.
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