The John Deere AH134778 Arm is a genuine OEM replacement part designed for a wide range of John Deere agricultural machinery. This essential component ensures proper function in various applications, including combines (9400, S790 series), cotton pickers (9960, 9976 series), forage harvesters (7180, 7980 series), self-propelled sprayers (4700, 4940 series), and windrowers (4890, 4995 series). Weighing approximately 0.12 kg, this arm is built to John Deere's rigorous quality standards, providing reliable performance and durability for critical machine operations.