1154237 Pulley-Idler Fits Caterpillar ModelsOne New Aftermarket Replacement Pulley Idler for Caterpillar Equipment This aftermarket replacement idler pulley is part of the engine belt drive system on a wide range of Caterpillar (Cat) equipment powered by the 3114, 3116, 3126, 3126B, 3126E, C 9, C7, and C9 engine families. The idler pulley maintains proper belt tension and alignment in the accessory drive, helping protect the water pump, alternator, and related components from premature wear.
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