This V-belt transmits power from the engine pulley to the driven components in the harvester's drive system. It sits in the primary belt path, connecting the crankshaft output to the input shaft of the threshing or cleaning assembly. A worn or slipping belt reduces rotor speed, causing uneven crop flow and increased material loss at the sieves. The belt's profile matches the original pulley groove geometry, ensuring correct tension and preventing sidewall wear. On installation, verify the belt is seated fully in each pulley groove and adjust the tensioner to the specified deflection.