The McCormick 3664512M91 is a genuine OEM distribution pump designed for the fuel system of various agricultural tractors. This essential component ensures proper fuel delivery and is compatible with a wide range of McCormick, Landini, and Massey Ferguson models, including the McCormick C-MAX, CX, X4, X5, X6, X7, T-MAX, and T-MAX CAB series, Landini 5D, 5H, Alpine, Powerfarm, and Technofarm series, and Massey Ferguson 3600, 4700, 5600, and 6600 series tractors. It is also cross-referenced as an equivalent part by AGCO, Landini, Massey Ferguson, and Perkins.