This multi-rib belt drives the alternator from the engine crankshaft pulley. It sits in the drive system of the host tractor, transmitting rotation to the alternator rotor to maintain battery charge and supply electrical power to the machine's systems. A worn or slipping belt causes undercharging, dim lighting, and erratic operation of electronic controls. As an original-manufacturer component, the belt is molded to the specified profile and rib count, which matches the pulley grooves in the drive system so that tension is held evenly across the full width without edge wear. On installation, ensure the belt is routed over all pulleys in the correct path and tensioned to the manufacturer's specification.