Bosch Rexroth | AA10VSO71DFR131R-VPA12N00
AA10VSO71DFR1/31R-VPA12N00
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The AA10VSO71DFR1/31R-VPA12N00 axial piston unit is produced by Bosch Rexroth within the A10VSO Variable Pumps series and supplies adjustable oil flow for hydraulic automation circuits. The geometric displacement is 71 cm³ per revolution, so each shaft turn moves that volume of fluid into the system. At 1800 rpm the pump delivers 33.8 gpm, giving steady capacity for medium-duty actuators, while a nominal speed of 2200 rpm defines its standard operating point. Continuous service is supported by a nominal pressure rating of 4100 psi, and a DFR1 differential pressure setting of 200 psi establishes the compensator control margin between inlet and outlet. Flow accuracy is held within a maximum deviation of 0.70 gpm between the DFR and DFR1 regulators. Inlet conditions are limited to 145 psi at the suction port to prevent cavitation, and the bare pump weighs 78 lb, a figure relevant when designing mounting brackets and supports.
The pump reaches 41.2 gpm at rated shaft speed, providing additional flow for transient demand peaks, and it can run up to 2600 rpm when set below maximum displacement to enhance dynamic response. System overloads are managed by a maximum pressure limit of 5100 psi, with both the pilot and working ports designed to withstand the same 5100 psi, simplifying circuit relief selection. Drive torque requirements rise to 233 lb-ft at 280 bar and measure 83 lb-ft at 100 bar, helping size prime movers and couplings accurately. Case leakage returns to tank through a drain port limited to 30 psi to protect shaft seals. These performance boundaries outline safe operation and ensure reliable pressure and flow regulation in automated hydraulic machinery.
Technical Specifications
Dfr1 Differential Pressure Setting
200 psi (14 bar)
Drain Port Pmax
30 psi (2 bar)
Flow At 1800 Rpm
33.8 gpm (128 l/min)
Geometric Displacement
71 cm3/rev (4.33 in3/rev)
Max Flow At Nnom
41.2 gpm (156 l/min)
Max Flow Deviation (dfr/dfr1)
0.70 gpm (2.8 l/min)
Max Speed (vg < Vg Max)
2600 rpm
Max Torque At 280 Bar
233 lb-ft (316 Nm)
Maximum Pressure
5100 psi (350 bar)
Nominal Pressure
4100 psi (280 bar)
Nominal Speed (vg Max)
2200 rpm
Pilot Port Pmax
5100 psi (350 bar)
Suction Port Pmax
145 psi (10 bar)
Torque At 100 Bar
83 lb-ft (113 Nm)
Weight (without Through Drive)
78 lb (35.2 kg)
Working Port Pmax
5100 psi (350 bar)
1620 Old Apex Road
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