The DAYCO heavy duty belt tensioner for Freightliner and Peterbilt is designed for precise fitment, reducing vibration. This tensioner features an optimized spring design that maintains optimal tension, which contributes to improved belt function by reducing wear on the belts. This minimizes the risk of premature belt failure. The smooth operation of the tensioner helps decrease engine noise. Heavy duty bearings are incorporated for providing consistent tension, thus increasing the longevity of components.