This V-belt transmits power from the engine or gearbox to the rotor drive system of a combine harvester. It sits in the drive system and connects the rotating output to the rotor input pulley, maintaining the correct tension to keep the rotor at operating speed under varying crop loads. A worn or slipping belt reduces rotor speed, leading to incomplete threshing and increased grain loss. This original belt is constructed with the same internal cord layup and rib profile as the factory-installed part, so it seats correctly in the pulley grooves without requiring shimming or alignment adjustment. On installation, verify the belt tension matches the specification for the drive system and replace the belt as a matched set if multiple belts share the same drive.