Caterpillar 271-5646 Serpentine Belt Tensioner is a belt-drive component designed for Caterpillar C7 and C9 engines. The tensioner maintains proper tension on the serpentine belt in the engine's accessory drive system, supporting proper operation of belt-driven components. Use this part number 271-5646 when servicing C7/C9 engines that require a CAT serpentine belt tensioner.
