This gear transmits drive from the header input shaft to the gathering-chain or auger system on a corn header. It is mounted in the gearbox or drive housing and meshes with the mating pinion to maintain the correct rotational speed for crop intake. A worn or damaged gear produces irregular chain motion, leading to plugging or uneven feeding of stalks into the snapping rolls. This original part is machined to the same tooth profile and hardness as the factory component, so it matches the existing backlash without requiring shim adjustment. On installation, verify that the keyway and shaft are clean and free of burrs before seating the gear.