This gear transfers drive from the feeder-house input shaft to the chain or belt that powers the material-feeding mechanism inside the combine. It is mounted on a shaft in the feeder-house gear train and meshes with a mating gear to maintain the correct rotational speed for the feed drum or conveyor. A worn gear produces backlash that causes irregular feeding and can lead to chain skipping or material bunching at the throat. The gear is machined to match the original tooth profile and pitch diameter, so it engages the adjacent gear without requiring shimming or adjustment.