This V-belt transmits drive from the engine to the straw chopper rotor on the parent combine. It runs on the pulley system that connects the chopper input shaft to the drive source, maintaining the rotor speed needed for consistent straw processing. A worn or slipping belt reduces chopper throughput and can cause uneven straw distribution behind the machine. The belt is constructed by Gates to match the original cross-section and length, preserving the tension and wrap angle the drive system requires. When replacing, ensure the belt is seated fully in the pulley grooves and tensioned to the manufacturer's specification.