This gear drives the feeder mechanism that moves crop material from the header into the threshing unit. It meshes with the mating gear in the feeder housing to maintain the correct rotational speed of the feed chain or auger. A worn or missing tooth causes intermittent feeding, which leads to uneven crop flow and potential blockages upstream. The gear is machined to match the original tooth profile and bore diameter, so it engages without backlash beyond the design tolerance. On replacement, verify that the retaining hardware is torqued to specification and that the gear rotates freely before reinstalling the housing cover.