The John Deere AT25852 Valve is a genuine OEM component designed for various John Deere agricultural and construction machinery. This essential valve ensures proper hydraulic system function across a wide range of models including 4030, 4040, 4230, 4240, 4430, 4440, 4630, 4640, 4840, 8430, 8440, 8630, 8640 series tractors, 444, 544, 644, 844 loaders, 540B, 640, 740 skidders, 690B excavators, 770A, 772A motor graders, and 762A, 762B scrapers. Manufactured to John Deere's specifications, it provides reliable performance and precise control.