When lubricating a pillow block bearing, you should pump until what occurs?

• A. Until Old Grease Begins To Flow Out Of The Bearing
• B. Until The Bearing Is Completely Full
• C. Until The Temperature Rises
• D. Until The Noise Stops

Answer: (A)

Purging old grease and contaminants is the goal when lubricating a pillow block bearing. You pump until you see the old grease begin to flow out of the bearing. This shows the fresh grease has displaced the dirty material and filled the lubrication passage, giving a clean path for ongoing lubrication. Stopping at that point helps prevent overfilling and potential seal leaks or excessive pressure. The other indicators aren’t reliable guides—temperature rise can signal many issues, noise stopping doesn’t guarantee proper lubrication, and trying to fill the bearing completely isn’t necessary and can cause problems.