Hydraulic Pump Repair Kit MK2 for Massey Ferguson 31 135 148 158 165 122 Tractor. Suitable for Late MK2 Models Piston Diameter: 25mm Please check the model serial no. Massey Ferguson (135, 116249>447440), (148, 158 >606024), (165, 582206> 136610), (168>256093), 31, 50, 122, 133, 134, 140, 145, 150, 152, 155, 164, 174, 175, 178, 184, 185, 188, 194, 285, 595, 1080, 1085, 1200.