This V-belt transmits power from the engine to the threshing drum, synchronizing the drum speed with the feed rate of the crop intake. It runs on the pulley set that connects the engine output shaft to the threshing mechanism input. A worn or stretched belt slips under load, causing a drop in drum speed that reduces threshing efficiency and can leave grain unseparated. The belt is constructed with a tensile cord layer and a fabric-wrapped cover, which provides the friction grip needed for the pulley contact surfaces. On installation, verify the belt is seated fully in each pulley groove and adjust the tensioner to the specified deflection.