This gear transmits drive within the corn header, engaging with the mating gear to rotate the gathering chain or snapping-roll assembly. It is a 54-tooth spur gear, and its tooth profile and pitch match the original factory specification for the header's drive train. A worn or damaged gear produces irregular chain speed or roll timing, leading to uneven crop intake and potential plugging. Replacing with the original manufacturer's gear preserves the correct backlash and load distribution in the gear train, which prevents accelerated wear on the adjacent bearings and shafts.