Over-greasing an electric motor typically results in which consequence?

• A. Decreased noise
• B. Increased lubrication
• C. No effect
• D. Increased heat

Answer: (D)

Too much lubricant changes lubrication from a simple friction reducer to a source of drag. When you add more grease than the bearings need, the grease film becomes thicker and tougher to move, so the bearings must work harder to turn. That extra work shows up as heat inside the bearing and in the grease itself. The grease can also trap heat instead of helping it escape, making the temperature rise higher. This heat buildup is why over-greasing an electric motor typically leads to increased heat, which can accelerate wear and reduce motor life.