A possible result of over greasing a bearing is:

• A. Corrosion
• B. Lubricant foaming
• C. Vibration
• D. Friction

Answer: (D)

Over-greasing a bearing adds more lubricant than the bearing can use effectively, which creates viscous drag as the rolling elements move through the extra grease. That drag means the bearing has to work harder to rotate, leading to increased friction and generated heat. This rise in friction is the most direct and likely consequence of applying too much grease, and if the heat builds up, it can further degrade lubrication and wear. While other effects like foaming or vibration can occur in some situations, friction is the primary result tied to the excess lubricant. Corrosion isn’t caused by over-greasing, and foaming is a possible byproduct rather than the fundamental outcome.