Why are belts replaced as a set?

Belts are typically replaced as a set because they stretch over time. When a belt is subjected to continuous operation, it experiences wear and tear due to friction, temperature changes, and load variations. This wear causes belts to elongate, which can lead to uneven tension amongst the belts in a system.

If only one belt is replaced while the others remain in service, the newly installed belt may have a different tension and performance characteristic compared to the older belts. This disparity can cause the new belt to wear out more quickly, leading to premature failure, or it can affect the overall performance of the system. By replacing all belts simultaneously, the risk of uneven wear and the potential for future issues are minimized, ensuring optimal performance and longevity across the entire system.