This V-belt transmits power from the engine drive pulley to the hydraulic pump on the host combine. It is a single-rib, classical-section belt that runs in a dedicated groove on each pulley. A worn or slipping belt reduces pump output, causing slow header response and diminished steering assist. The belt’s cross-section matches the original pulley groove profile, so it seats correctly without riding high or bottoming out. When replacing, ensure the belt tension is set to the manufacturer’s specification and that both pulleys are aligned in the same plane.