Use this Concentric High Pressure Hydraulic Gear Pump on mobile equipment, construction and agricultural equipment, machine tools, material handling and mining equipment, PTO pumps, refuse haulers, compaction and baling equipment. Standard 4-bolt mount. 1.78in. diameter pilot with 1/2in. x 1 1/2in. shaft, 1/8in. square key. Heavy duty cast iron pump turns at 4,000 RPM max. in CW or CCW direction. Use as a fluid pump or fluid motor. Similar to Parker D Series, Webster YB Series, Rexroth S12, MTED Series. Flexible coupling or belt (pulley) drive. 90% efficient.