Bosch Rexroth | AA10VO71DFR-31R-VSC92N00
AA10VO71DFR /31R-VSC92N00
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The AA10VO71DFR /31R-VSC92N00 pump from Bosch Rexroth is part of the A10VSO Variable Pumps series and is intended for hydraulic automation circuits where flow must be adjusted on demand. It delivers 4.33 in³ per revolution, which defines the volume displaced each shaft turn and allows designers to predict actuator speed. During normal operation it withstands 4 000 psi, while a short-term peak of 5 100 psi covers pressure spikes common in rapid load changes. The differential pressure setting of 200 psi maintains stable control of the DFR regulator, and the unit shifts to full stroke in 60 ms at the rated pressure so actuators receive flow quickly. Returning to minimum displacement takes only 30 ms, supporting energy-saving standby modes. Side ports designated 92 N00 place service lines on one housing face to simplify manifold layout, and a dry weight of 73 lb eases mounting without hoists in medium-size power units.
The pump accepts oil through a 2-in SAE J518 inlet flange; this port size supports adequate velocity even at the maximum absolute inlet pressure of 435 psi. Suction reliability is preserved down to 12 psi absolute, making the unit suitable for tanks positioned below the pump centerline. Pressurized flow exits via a 1-in SAE J518 outlet, secured with a 3/8-16 UNC-2B stud pattern that matches common manifold blocks. Proper clamp force is achieved by tightening these fasteners to 29 lb-ft, preventing gasket extrusion under full load. Case leakage is routed through a 7/8-14 UNF-2B drain port, and the internal bearings remain protected because case back-pressure must not exceed 29 psi absolute. Together, these connection details and pressure limits ensure the pump integrates reliably into closed-loop or open-loop hydraulic systems that demand variable output and compact plumbing.
Technical Specifications
Case Drain Port
7/8-14 UNF-2B
Destroking Time At 4000 Psi (dfr)
30 ms
Differential Pressure Standard (dfr)
200 psi (14 bar)
Geometric Displacement
4.33 in3/rev (71 cm3/rev)
Inlet Port
SAE J518 2 in
Maximum Case Drain Pressure (abs)
29 psi (2 bar)
Maximum Inlet Absolute Pressure
435 psi (30 bar)
Minimum Inlet Absolute Pressure
12 psi (0.8 bar)
Nominal Pressure
4000 psi (280 bar)
Peak Pressure
5100 psi (350 bar)
Port Arrangement
Side Ports (92 N00)
Pressure Port
SAE J518 1 in
Pressure Port Fixing Thread
3/8-16 UNC-2B
Pressure Port Tightening Torque
29 lb-ft (40 Nm)
Stroking Time At 4000 Psi (dfr)
60 ms
Weight (dry)
73 lb (33 kg)
1620 Old Apex Road
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