Increased current draw to a gear box motor indicates which issue?

Increased current draw to a gear box motor indicates which issue?

• A. Bad bearings
• B. Worn gears
• C. Electrical overload
• D. Misalignment

Answer: (A)

When a motor is asked to deliver more torque than usual, the current it draws goes up. Bad bearings create extra friction and binding in the shaft, which makes the gearbox resist rotation more. That additional mechanical resistance means the motor must work harder to turn at the same speed, so it draws more current. Worn gears or misalignment can also increase load, but they typically show up as noise or vibration and don’t consistently explain a steady rise in current the way bearing friction does. Electrical overload is a supply or electrical issue, not a mechanical resistance inside the gearbox. So increased current draw in this case points to bearing damage.

When a motor is asked to deliver more torque than usual, the current it draws goes up. Bad bearings create extra friction and binding in the shaft, which makes the gearbox resist rotation more. That additional mechanical resistance means the motor must work harder to turn at the same speed, so it draws more current. Worn gears or misalignment can also increase load, but they typically show up as noise or vibration and don’t consistently explain a steady rise in current the way bearing friction does. Electrical overload is a supply or electrical issue, not a mechanical resistance inside the gearbox. So increased current draw in this case points to bearing damage.