A4VG Series 180cc Axial Piston Variable Hydraulic Pump for Closed Circuit Mobile Machinery Key Features 1. EP4 electric control version, precise signal control, fast response 2. Built-in auxiliary charge pump for make-up oil & pilot supply 3. Integrated high pressure relief valves to protect hydraulic system 4. Modular design, easy maintenance and interchangeable replacement 5. Low noise, high efficiency, long service life 6. High strength cast iron housing, wear-resistant