This V-belt drives the threshing mechanism within the combine harvester. It transmits torque from the engine or gearbox to the threshing rotor and concave assembly. A worn or slipping belt reduces rotor speed, leading to incomplete grain separation and increased losses over the walkers. The original manufacturer's belt is constructed to match the pulley profile and tension characteristics of the original drive system, ensuring consistent grip and minimal stretch over the operating season. When replacing, verify the belt is seated fully in the pulley grooves and adjust tension to the specification for the drive.