A-H169065-AI Jackshaft, Straw Chopper DriveOne New Aftermarket Replacement Fine Cut Straw Chopper Drive Jackshaft for John Deere Combines This aftermarket replacement jackshaft serves the fine cut straw chopper drive system in John Deere conventional (walker) combines. Located in the discharge area of the combine, the jackshaft transmits belt driven power to the straw chopper rotor, enabling high speed residue cutting and distribution across the field. Replacing a worn or damaged jackshaft