This V-belt transmits power from the engine drive pulley to the straw-chopper or straw-spreader system on the parent combine. It is a two-groove belt that runs on the dedicated pulley set for the straw-handling drive. A worn or slipping belt causes inconsistent chopper speed, leading to uneven straw distribution behind the machine. As an original component, it matches the original belt’s cross-section and pitch length, so the tensioner and pulley alignment remain within specification without adjustment. On installation, verify the belt is seated fully in both pulley grooves and tension to the value specified for the drive system.