A probable cause for excessive stretch in a belt drive system can be __________.

Excessive tension in a belt drive system can lead to excessive stretch of the belt. When the tension is too high, it not only increases the wear on both the belt and the pulleys, but it can also cause the belt to deform or elongate beyond its design specifications. This excessive tension can generate increased friction and heat, ultimately contributing to premature failure of the belt.

In a successful belt drive system, it is essential to maintain the correct tension to ensure optimal performance and longevity. This means that while there are factors like lubrication, belt type, and environmental conditions that can also affect the performance of the system, excessive tension stands out as a direct cause of stretching that can compromise the integrity of the belt itself.