This gear wheel transfers rotational drive from the header driveline to the internal mechanism that powers the intake auger and cutterbar. It is mounted on a shaft within the header gearbox, meshing with a mating pinion to reduce or increase speed as required by the system. A worn or chipped tooth causes irregular auger speed, leading to material bunching at the header throat and potential blockages. Manufactured by JAG, this gear wheel is machined to the original tooth profile and pitch circle, ensuring correct backlash with the mating gear without requiring shimming. On installation, verify that the three mounting holes align with the flange bolts and that the gear rotates freely before securing the retaining hardware.