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The Mack Accessory Drive Belt replaces a cracked or glazed belt before slipping interrupts drive to the alternator, water pump, or air compressor. The Mack 23749479 follows the original pulley route and tensioner layout used by those accessories. Because several components share that same belt, one damaged section can affect more than one system at once. Replacing the belt before failure keeps the accessory drive working without waiting for a roadside break.
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