Excessive grease can cause a bearing to _______ than normal.

Excessive grease can cause a bearing to _______ than normal.

• A. Wear longer
• B. Run hotter
• C. Seize
• D. Run cooler

Answer: (B)

Overpacking a bearing with grease makes it work through a thicker lubricant layer, which increases viscous resistance as the rolling elements turn. That extra drag converts more of the motor’s energy into heat, so the bearing runs hotter than normal. The excess grease can also limit airflow around the bearing and hinder cooling, making the temperature rise even more. While extreme overheating can lead to problems like grease breakdown or, in severe cases, seizure, the typical and most direct consequence of too much grease is an elevated operating temperature.

Overpacking a bearing with grease makes it work through a thicker lubricant layer, which increases viscous resistance as the rolling elements turn. That extra drag converts more of the motor’s energy into heat, so the bearing runs hotter than normal. The excess grease can also limit airflow around the bearing and hinder cooling, making the temperature rise even more. While extreme overheating can lead to problems like grease breakdown or, in severe cases, seizure, the typical and most direct consequence of too much grease is an elevated operating temperature.