This shaft and gear assembly drives the gathering chain or auger mechanism within the corn header. It transmits rotational force from the drive system to the moving components that pull the crop into the processing area. The 13-tooth gear engages with a matching sprocket or chain to maintain the correct speed ratio for consistent crop intake. A worn or damaged gear tooth can cause chain slippage, irregular feeding, and increased load on the upstream drive components. This original part is machined to the same tooth profile and pitch as the factory assembly, ensuring proper chain engagement without adjustment.