High-accuracy Hall effect speed sensor engineered for John Deere heavy equipment. Direct replacement for OEM part number AT391277. Built to withstand high-vibration off-road operations.Equipment Fitment:John Deere Wheel Loaders: 444K, 524K, 524K-II, 544K, 544K-II, 624K, 624K-II, 644K, 644K Hybrid, 724K, 744K, 744K-II, 824K, 844K, 844K-III, 844K-III Aggregate Handler, 944 X, 944K.