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20953521
This idler pulley is a vital part of the serpentine belt or fan drive system on Mack MP7 and Volvo D11 engines.
It guides and maintains tension on the belt, ensuring proper alignment and preventing slippage that can lead to premature belt wear or accessory failure. A failing pulley often produces squealing or chirping noises, belt wobble, or overheating, and replacement is recommended at the first sign of bearing wear. This is a direct OEM-grade component built to withstand the demands of heavy-duty truck operation.
Primarily used as a fan drive idler pulley. Direct replacement for OEM numbers 20953521 and 20953529.
Part data verified against 5 catalog sources
Part Number: 20953521
IDLER PULLEY
Dealer: Knox Trailers
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