The McCormick 3661916M91 is a genuine hydraulic pump seal kit designed for maintaining and repairing hydraulic systems in a wide range of agricultural tractors. This essential seal kit ensures optimal performance and prevents leaks in hydraulic pumps across McCormick C, CX, MC, MTX, T-MAX, X4, X5, X6, X7, XTX, ZTX series, Massey Ferguson 300, 4200, 4300, 5400, 6100, 6200, 6400, 7400, 8100, 8200 series, and Landini 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 160, 180, 210, 230, 260, 280 series tractors.