Bosch Rexroth | AA10VO28DFR52R-VSC64N00
AA10VO28DFR/52R-VSC64N00
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The AA10VO28DFR/52R-VSC64N00 axial piston pump belongs to the A10VSO Variable Pumps series and is produced by Bosch Rexroth. It supplies variable hydraulic flow for automatic machine functions. A displacement of 28 cm³ per revolution defines the volume moved each shaft turn, allowing predictable circuit sizing. At a typical 1800 rpm drive speed, it delivers 13.3 gpm, matching medium-duty actuator demands. When driven to its permitted maximum speed of 3000 rpm at full geometric displacement, flow rises to 22 gpm, while operation at a reduced displacement lets the shaft reach 3600 rpm to enhance speed range without excess flow. The pump develops 92 lb-ft of torque at 280 bar, indicating the mechanical drive load that must be provided. Internal oil capacity is 0.185 gal, which maintains bearing lubrication and heat removal, and the pump weighs 33 lb without hydraulic fluid, a factor for mounting and service access.
System limits are established by a nominal pressure rating of 280 bar for continuous duty and a peak pressure rating of 350 bar for intermittent transients. The integrated DFR controller is set to a differential pressure of 200 psi, permitting load-sense regulation against downstream pressure variations. Safe suction conditions are defined by a minimum inlet pressure of 0.8 bar absolute and a maximum inlet pressure of 30 bar absolute to prevent cavitation or overloading of the shaft seal. Case drain back pressure must not exceed 2 bar absolute so internal leakage can return freely to the reservoir. Under load-sense control the maximum flow deviation is restricted to 0.30 gpm to keep actuator speed stable. External pilot signals connect to port X with a 7/16-20 UNF-2B thread that is 10 mm deep, providing a standard interface for control lines.
Technical Specifications
Case Volume
0.185 gal (0.7 L)
Differential Pressure Setting (dfr)
200 psi (14 bar)
Displacement Per Rev
28 cm³/rev (1.71 in³/rev)
Flow At 1800 Rpm
13.3 gpm (50 L/min)
Max Case Drain Pressure (abs)
2 bar (29 psi)
Max Flow At Max Speed
22 gpm (84 L/min)
Max Flow Deviation (dfr)
0.30 gpm (1.0 L/min)
Max Inlet Pressure (abs)
30 bar (435 psi)
Max Speed At Reduced Vg
3600 rpm
Max Speed At Vg Max
3000 rpm
Min Inlet Pressure (abs)
0.8 bar (12 psi)
Nominal Pressure
280 bar (4000 psi)
Peak Pressure
350 bar (5100 psi)
Pilot Port X Thread
7/16-20 UNF-2B (10 mm deep)
Torque At 280 Bar
92 lb-ft (125 Nm)
Weight (without Fluid)
33 lb (15 kg)
1620 Old Apex Road
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