This V-belt transmits power from the engine pulley to the drive system of the parent combine harvester. It sits in the primary drive loop, connecting the crankshaft or intermediate shaft to the driven pulley that powers the threshing and separation mechanisms. A worn or slipping belt reduces rotor speed, causing incomplete threshing and increased grain loss. The belt is manufactured to the original profile and length specifications, so it seats correctly in the pulley grooves without requiring tensioner adjustment beyond the standard range. On installation, verify the belt is not twisted and that the tensioner is set to the manufacturer's specified deflection.