This gear transfers drive from the grain-tank unloading auger to the cross-conveyor that moves crop toward the discharge spout. It meshes with the mating gear on the auger shaft and maintains synchronized rotation between the two conveying stages. A worn or missing tooth causes intermittent drive, leading to plugging at the transition point between the auger and the conveyor. The gear is machined to match the original shaft spline and tooth profile so that backlash stays within the range the drive chain expects. On replacement, verify that the retaining clip seats fully in its groove.