A10VSO71DFR/31R-VPA12N00

The A10VSO71DFR/31R-VPA12N00 variable pump belongs to the A10VSO Variable Pumps series and is produced by Bosch Rexroth for closed-loop hydraulic automation circuits. It converts mechanical input into regulated hydraulic flow so actuators receive precise oil volume. The pump displacement of 71 cm³ per revolution defines how much fluid is delivered with each shaft turn, while the case volume of 1.6 l sets the internal oil quantity that lubricates and cools rotating parts. Under nominal operating conditions it withstands 280 bar, and its maximum pressure limit of 350 bar allows temporary overload without damage. When the system pressure is 100 bar the shaft develops 113 N·m of torque, rising to 316 N·m at 280 bar to match heavier loads. At 1800 rpm and full displacement it supplies 128 l/min of flow, ensuring constant actuator speed in medium-size machines. Fluid enters through a 2 in SAE J518 suction port and exits through a 1 in SAE J518 pressure port for straightforward pipe selection. The assembly weighs 35.2 kg, which guides mounting choices in mobile or stationary frames.

Dynamic performance is influenced by a rotor moment of inertia of 0.0083 kg·m², allowing quick swash-plate adjustments when the controller demands rapid flow change. The pump can turn up to 2600 rpm at reduced displacement, giving designers flexibility to meet high-speed cycles, while its permitted speed at maximum displacement is 2200 rpm to avoid excessive peripheral velocity. Under rated speed and full displacement it can supply a maximum flow of 156 l/min, supporting circuits with multiple parallel actuators. Power consumption is 73 kW at nominal speed and drops to 69 kW when the shaft runs at 1800 rpm; these figures help size the prime mover. The no through-drive arrangement simplifies mounting by removing additional shaft extensions, and the suction and pressure ports described earlier remain the sole fluid interfaces in the installation.