The John Deere AL37974 is a genuine OEM hydraulic relief valve designed to regulate hydraulic pressure within John Deere agricultural and industrial equipment. This critical component ensures optimal system performance and prevents over-pressurization, protecting hydraulic circuits and components. It is compatible with a wide range of John Deere tractor models, including the 1020, 1030, 1040, 1120, 1130, 1140, 1630, 1640, 1830, 1840, 2020, 2030, 2040, 2120, 2130, 2140, 2250, 2450, 2650, 2850, 3030, 3040, 3050, 3120, 3130, 3140, 3350, 3640, 3650, 4040, 4050, 4055, 4240, 4250, 4255, 4440, 4450, 4455, 4640, 4650, 4840, 4850, 8430, 8440, 8450, 8630, 8640, and 8650 series.