This V-belt transmits power from the engine drive pulley to the threshing and cleaning systems of the parent combine. It is a single-rib, classical-section belt that runs in a matched pulley groove on the drive system. A worn or slipping belt reduces rotor speed and causes uneven crop flow through the separator. The manufacturer's original profile matches the pulley's groove angle and depth, maintaining proper tension without requiring a belt-tensioner adjustment beyond the normal range. On replacement, verify that the belt runs in the correct rotation direction and that the tensioner arm moves freely before setting the deflection to the specification in the service manual.