This upper shaft is the driven component at the top of the inclined conveyor assembly. It transfers rotational force from the conveyor drive to the chain or belt that moves crop material up the feeder housing toward the threshing cylinder. The shaft rides in bearings at each end of the conveyor housing; its outer diameter matches the sprocket or pulley bore for a slip-free fit. Wear on the shaft surface or bearing journals causes chain slack and misalignment, which can lead to uneven feeding and increased load on the drive system. This component is manufactured to the original shaft geometry so that the existing sprockets and bearings mount without modification.