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Bard part number 5501-018 is an OEM round belt drive pulley used in select Bard belt driven assemblies where a motor transfers power to a rotating component through a round belt. Replacing a worn or grooved pulley helps restore correct belt tracking, stable speed, and quiet operation, which can reduce belt slip and premature belt wear. For best results, confirm the pulley style and bore match your unit and inspect the belt and alignment at the same time, since pulley wear is often caused by misalignment or an over tightened belt. As a genuine Bard replacement, 5501-018 is intended to fit and function like the original factory part when matched to the correct model and serial number.