This gear drives the auger conveyor that moves crop material through the feeding unit. It is mounted on the left side of the conveyor assembly and meshes with the mating gear on the opposite shaft. A worn gear produces slippage or irregular conveyor speed, which can cause material buildup and blockages in the feed path. The manufacturer machines the tooth profile and bore to match the original assembly, so the gear engages without backlash adjustment. On installation, verify the keyway alignment and secure the retaining hardware to the specified torque.