Product Overview This variable displacement axial piston hydraulic pump is designed for the CAT D6N track-type tractor, including the D6N XL, D6N FTC, and D6N LGP versions equipped with the 3126B engine. It delivers hydraulic power for blade lifting, tilting, steering, and all working hydraulic circuits. Part Number 156-9084 Interchange Part Number 20R-3311 Pump Type Variable Displacement Axial Piston Hydraulic Pump Compatible Machine CAT D6N Track-Type Tractor (D6N XL, D6N