1979642 Pulley As-Idler Fits Caterpillar ModelsOne New Aftermarket Replacement Idler Pulley Assembly for Caterpillar (Cat) Engines and Equipment This accessory drive belt idler pulley assembly (Pulley As Idler) fits a wide range of Caterpillar (Cat) diesel engines and machines. The 8 groove pulley guides and tensions the accessory drive belt, reduces belt vibration, and supports belt driven components including the alternator and compressor assemblies. The assembly includes the idler pulley,
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