The McCormick 3666567M91 is a genuine OEM hydraulic pump designed for a wide range of McCormick agricultural tractors, including the CX, MC, MTX, and XTX series. This essential component ensures efficient hydraulic system operation, providing power for various implements and steering functions. It is also cross-referenced as an OEM part for Massey Ferguson and Landini models, guaranteeing broad compatibility and reliable performance across multiple machinery brands.