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(888) 312-8812 Login SignupFor Cummins engines that run long highway or work-site shifts, the Cummins V-Ribbed Belt drives the alternator, fan, and other accessories continuously. Constant flexing over many hours eventually cracks the ribs and glazes the belt sides, until grip falls off under load. Swapping to the Cummins 3974246 restores firm grip before a worn belt slips or breaks. Changing belts on schedule prevents unplanned stops on the road or the job site.
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