Bosch Rexroth | AA10VSO71DFR-31R-VKC92N00
AA10VSO71DFR /31R-VKC92N00
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The AA10VSO71DFR /31R-VKC92N00 pump is part of the A10VSO Variable Pumps series produced by Bosch Rexroth for closed-loop hydraulic automation. It adjusts swashplate displacement to provide controlled oil flow to actuators. The geometric displacement of 71 cm³ per revolution sets the maximum volume delivered per rotation and allows sizing of the hydraulic circuit. A nominal pressure rating of 4000 psi defines the continuous operating limit, while the higher peak pressure of 5100 psi covers short-term load spikes. Minimum inlet pressure of 12 psi and maximum inlet pressure of 435 psi specify the suction conditions needed to prevent cavitation or overloading the charge circuit. The differential pressure setting of 200 psi within the DFR control keeps the load-sensing spool balanced and stabilizes flow under varying demand. A case volume of 0.420 gal holds internal leakage oil so thermal expansion can be managed. Maximum case drain pressure is limited to 29 psi to protect shaft seals and avoid forcing excess oil past them.
At 1800 rpm and full displacement the pump outputs 33.8 gpm, providing a reference flow rate for standard industrial motors. When driven at nominal speed with the swashplate at maximum angle, the flow can rise to 41.2 gpm, which defines the upper delivery capability for high-demand circuits. The DFR controller limits flow variation to 0.70 gpm on size 71 units, maintaining precise actuator speed despite pressure fluctuations. Maximum permissible speed of 2600 rpm applies when the displacement is reduced, enabling higher flow without exceeding tip velocity limits, whereas the speed must be kept at or below 2200 rpm when displacement remains at maximum to protect rotating parts. Torque demand reaches 233 lb-ft at a system pressure of 4100 psi, a figure used to size the prime mover and coupling. Driving the pump at nominal speed and 4100 psi requires 98 hp, which assists in selecting suitable electric or diesel motors. The assembly weighs 78 lb without a through drive, affecting mounting structure and handling during service.
Technical Specifications
Case Volume
0.420 gal (1.6 L)
Differential Pressure Setting (dfr)
200 psi (14 bar)
Displacement (geometric)
71 cm³/rev
Flow At 1800 Rpm (vg Max)
33.8 gpm (128 L/min)
Max Case Drain Pressure (abs)
29 psi (2 bar)
Max Flow (at Nnom, Vg Max)
41.2 gpm (156 L/min)
Max Flow Deviation (dfr, Size 71)
0.70 gpm (2.8 L/min)
Max Inlet Pressure (absolute)
435 psi (30 bar)
Max Permissible Speed (vg<vg Max)
2600 rpm
Max Speed At Vg Max
2200 rpm
Max Torque At 4100 Psi
233 lb-ft (316 Nm)
Min Inlet Pressure (absolute)
12 psi (0.8 bar)
Nominal Pressure
4000 psi (280 bar)
Peak Pressure
5100 psi (350 bar)
Power At Nnom, Δp 4100 Psi
98 HP (73 kW)
Weight (without Through Drive)
78 lb (35.2 kg)
1620 Old Apex Road
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