What signals indicate bearing lubrication is needed and how would you apply grease correctly to rolling-element bearings?

• A. Signals include increased noise, roughness, heat, or play; apply grease through the lubrication point until fresh grease appears, and avoid overgreasing.
• B. Signals include louder startup; apply grease until the bearing squeaks.
• C. No signals; grease once a year regardless.
• D. Apply grease only to external surfaces.

Answer: (A)