This V-belt transmits power from the engine to the threshing mechanism, driving the rotor or cylinder that separates grain from the straw. It sits in the primary drive path between the engine output pulley and the threshing-unit input pulley. A worn belt slips under load, causing a drop in threshing speed that leads to incomplete separation and increased grain loss. The belt is constructed with aramid tensile cords and a wrapped cover, matching the original profile for correct pulley engagement. On installation, verify the belt is seated fully in the pulley grooves and adjust tension to the specified deflection.