Bosch Rexroth | A10VSO28DFR31R-PPA12K57-TEST-CODE-000
A10VSO28DFR/31R-PPA12K57 Test Code 000
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The A10VSO28DFR/31R-PPA12K57 Test Code 000 variable pump belongs to the A10VSO Variable Pumps series from Bosch Rexroth and serves as a volume-controlled source for hydraulic automation circuits. It offers a displacement of 28 cm³ per revolution, translating shaft speed into predictable fluid delivery. At 1800 rpm it supplies 50 L/min, and its nominal working pressure of 280 bar supports actuators that require consistent force. The housing tolerates 350 bar during brief peaks, while clockwise rotation aligns with common engine drives. A differential pressure of 14 bar across the DFR control keeps the swashplate responsive to load shifts. When operating at full displacement the unit can spin to 3000 rpm, and 125 N·m is needed at 280 bar to overcome hydrodynamic torque. The assembly weighs 18 kg, a figure that affects bracket sizing and vibration isolation.
During fast traverse cycles the pump reaches 84 L/min at its nominal speed, and it can accelerate to 3600 rpm when the displacement is reduced, allowing energy-efficient variable-speed operation. Inlet oil is drawn through a 1 1/4-inch suction port built to ISO 6162-1, while the pressurized flow exits via a 3/4-inch port of the same interface for straightforward manifold connection. Internal leakage is returned through a 3/4-16 UNF-2B drain port to keep case pressure low, and pilot oil arrives through a 7/16-20 UNF-2B fitting for remote control of the swashplate angle. These connections work together to simplify hose routing, filtration, and pressure adjustment, ensuring the pump maintains stable flow and pressure over its full speed and displacement range.
Technical Specifications
Case Drain Port Size
3/4-16 UNF-2B
Dfr Differential Pressure
14 bar
Direction Of Rotation
Clockwise
Displacement
28 cm3/rev
Flow At 1800 Rpm
50 l/min
Max Flow At Nnom
84 l/min
Maximum Pressure
350 bar
Nominal Pressure
280 bar
Pilot Port Size
7/16-20 UNF-2B
Pressure Port Size
3/4 in (ISO 6162-1)
Speed Max At Reduced Vg
3600 rpm
Speed Max At Vg Max
3000 rpm
Suction Port Size
1 1/4 in (ISO 6162-1)
Torque At 280 Bar
125 Nm
Weight Without Through Drive
18 kg
1620 Old Apex Road
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