Rexroth A4VG AA4VG Hydraulic Piston Pump Variable Displacement Pumps 

Variable displacement axial piston pump AA4VG, Series 32 in swashplate design is for hydrostatic closed circuit transmissions. The flow is proportional to drive speed and displacement which is infinitely variable depending on the swashplate angle. The pump is equipped with two pressure relief valves on the high pressure ports to protect the transmission from overload.
Features
Sizes A4VG28 40 56 71 90 125
Axial piston swashplate design
Closed circuit
Series 32
Integrated boost pump acts as feed and oil control pump