The Gates Heavy Duty Automatic Belt Drive Tensioner is designed to provide superior performance and durability for Volvo and Mack. This tensioner features a machined steel pulley that reduces surface wear while shielding the internal bearing from external contaminants and damage. The labyrinth seal technology prevents contamination of internal parts, improving durability. The double row bearings carry more load and last up to three times longer than two separate bearings. The damping mechanism provides maximum stability, reduces vibration and increases service life. FleetPride is your First Click in Heavy Duty®.