This V-belt transmits torque from the engine to the hydrostatic drive pump on a grain harvester. It sits in the drive system, linking the engine pulley to the pump input pulley to provide propulsion power. A worn or slipping belt causes reduced ground speed and uneven travel under load, particularly when the machine is operating in heavy crop. The manufacturer matches the original belt's cross-section and length so the tensioner operates within its designed range. On installation, verify the belt is fully seated in both pulley grooves and adjust tension to the value specified for the drive system.