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880878

BELT TENSIONER MACK

This is an automatic belt tensioner designed for Mack MP7/MP8 and Volvo D11/D13 diesel engines. It maintains consistent tension on the serpentine drive belt, preventing slippage, squealing, and premature belt wear. The tensioner is typically replaced when the internal spring weakens, the pulley bearing becomes noisy, or when a new belt is installed to ensure reliable accessory drive operation.