The McCormick 6661631A1 is a genuine OEM hydraulic pump designed for optimal performance in McCormick X4 and X5 series agricultural tractors. This essential component ensures efficient hydraulic system operation, providing power for various implements and functions. Manufactured to McCormick's stringent quality standards, it guarantees durability and precise fitment for models including X4.20, X4.30, X4.40, X4.50, X4.60, X4.70, X4.80, X4.90, X4.100, X4.110, X4.120, X5.20, X5.30, X5.40, and X5.50.