Bosch Rexroth | AA10VSO28DFLR31R-VSA12N00
AA10VSO28DFLR/31R-VSA12N00
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The AA10VSO28DFLR/31R-VSA12N00 pump belongs to the A10VSO Variable Pumps series from Bosch Rexroth and supplies variable hydraulic flow for mobile and industrial automation circuits. It displaces 28 cm³ per revolution, allowing compact layouts to achieve medium flow rates. The DFLR pressure, flow, and power control arrangement lets the machine controller trim outlet conditions without separate valves. Clockwise shaft rotation matches right-hand power-take-off drives. A nominal speed rating of 3000 rpm defines the continuous operating point. At 1800 rpm the unit provides 50 L/min, covering slow diesel engines. Continuous service is permitted at 280 bar, and that pressure demands 125 Nm of drive torque so couplings can be sized correctly. The suction port must stay above 0.8 bar absolute to prevent cavitation during reservoir draw.
The pump tolerates 350 bar for short load spikes, giving reserve margin above its continuous rating. When run at nominal speed with full displacement it can deliver up to 84 L/min, supporting fast actuator cycles. A speed ceiling of 3600 rpm allows brief operation with high-speed electric motors, while power input may reach 39 kW under those conditions. Case drain oil exits through a port limited to 2 bar absolute to protect the shaft seals, and the pilot control port handles up to 350 bar for direct high-pressure logic feeds. The bare assembly weighs 18 kg, so a single technician can mount it on a skid. There is no through drive, meaning mechanical power cannot be passed to auxiliary pumps.
Technical Specifications
Case Port Max Pressure
2 bar abs (30 psi)
Control Type
DFLR (Pressure/Flow/Power)
Direction Of Rotation
Clockwise (R)
Displacement
28 cm³/rev (1.71 in³/rev)
Flow At 1800 Rpm
50 L/min (13.3 gpm)
Max Flow At Nnom
84 L/min (22 gpm)
Max Permissible Speed
3600 rpm
Max Power At Nnom
39 kW (52 HP)
Maximum Pressure
350 bar (5100 psi)
Nominal Pressure
280 bar (4100 psi)
Nominal Speed
3000 rpm
Pilot Port Max Pressure
350 bar (5100 psi)
Suction Port Min Pressure
0.8 bar abs (12 psi)
Through Drive
None (N00)
Torque At 280 Bar
125 Nm (92 lb-ft)
Weight (no Through Drive)
18 kg (40 lb)
1620 Old Apex Road
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