This V-belt transmits torque from the engine to the hydrostatic pump that drives the combine's propulsion and header systems. It sits on the pump input pulley and the engine crankshaft pulley, converting rotational power into hydraulic flow for the drive motors. A worn or slipping belt reduces pump output, causing sluggish ground speed and header response. This original-manufacturer belt is molded to the same pitch length and rib profile as the original assembly, so it seats fully in the pulley grooves without requiring tensioner adjustment beyond the standard range. On installation, verify the belt runs in the correct rotation direction and that the tensioner pulley is free of debris.