Knife Drive Arm Fits John Deere 1600 710 820 720 AE48822One New Aftermarket Replacement Knife Drive Arm Fits John Deere Mower Conditioners This aftermarket replacement knife drive arm is a critical component in the cutting system of Fits John Deere (Fits JD) mower conditioners. The knife drive arm transmits rotational power from the drivetrain to the cutter bar knife assembly, enabling consistent, high speed cutting action in hay harvesting operations. It features a 12 spline interface for a secure,