Belt slip is the loss of friction grip causing the belt to slide on the pulley; common causes include?

• A. Low tension, worn belt, misalignment, or overload.
• B. Over-tensioning the belt.
• C. Too much lubrication.
• D. Low ambient temperature.

Answer: (A)

Belt slip happens when the belt can’t maintain enough friction against the pulley to transmit the driving force. The most common causes are low tension, a worn belt, misalignment, or overload. When tension is too low, there isn’t enough pressing force between belt and pulley to generate the needed friction, so the belt slides. A worn belt often has a glazed or stretched surface that reduces grip, making slipping more likely. Misalignment means the belt runs off-center or on an angle, reducing the effective contact and causing edge wear that lowers friction. Overload occurs when the required torque exceeds what the belt-pulley grip can supply, so the belt slips to protect components. Over-tensioning isn’t typically a cause of slip and can cause other failures, while excessive lubrication or very low ambient temperature aren’t the primary, common causes referenced for belt slip.