Description:Cat idler pulleys are designed and tested to deliver the quality you expect from your equipment. Cat idler pulleys are responsible for guiding and tensioning the engine belt drives. They are also used to reduce belt vibrations by supporting a segment of belt prone to vibrations. Attributes:8 groove idler pulleyApplication:Cat idler pulleys are used to support engine belt drives around the various engine components, such as air compressor and alternator. Consult your owner’s manual or contact your local Cat Dealer for more information.