This shaft transmits drive from the gearbox to the rear press roller on the pick-up drum of a forage harvester. It connects the drum’s drive sprocket to the roller’s input hub, synchronizing the roller’s rotation with the pick-up tines. A bent or worn shaft causes the roller to wobble, leading to uneven crop compression and increased bearing wear on the drum assembly. This original part is machined to match the original spline profile and length, so the roller aligns correctly with the tine path without shimming. On installation, ensure the shaft is fully seated in both couplings and that the retaining hardware is torqued to specification.