Bosch Rexroth | A10VSO140DR31R-VPB12N00
A10VSO140DR/31R-VPB12N00
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The A10VSO140DR/31R-VPB12N00 variable pump belongs to the A10VSO Variable Pumps series and is manufactured by Bosch Rexroth. It supplies hydraulic actuators with adjustable flow by varying the swashplate angle. A displacement of 140 cm³ per revolution defines the volume moved each shaft turn, supporting large-volume circuits. The nominal pressure rating is 4000 psi for continuous duty, while a peak pressure limit of 5100 psi handles short overloads. A case volume of 0.79 gal stores leakage oil so heat can be carried away from the rotating group. Minimum inlet pressure is 12 psi absolute to avoid cavitation, and maximum inlet pressure is 435 psi absolute for boosted suction lines. Maximum speed at full displacement is limited to 1800 rpm to keep piston velocity within safe limits. Torque demand at 100 bar is 164 lb-ft, which guides motor sizing for low-pressure standby operation.
Additional limits apply when the pump is destroked for faster rotation and power matching. With displacement reduced below the maximum setting, the permitted shaft speed rises to 2100 rpm, increasing cycle frequency in dynamic machines. At 1800 rpm the pump delivers 66.6 gpm for fixed-speed prime movers, and the same 66.6 gpm is specified as the maximum flow at the allowable top speed, indicating flow is determined by displacement rather than speed in this range. Output power reaches 158 hp at 1800 rpm and 280 bar, while 157 hp is required at the higher speed limit, helping users select appropriate drive power. Torque demand climbs to 453 lb-ft at 280 bar to withstand full-load starts. Maximum case pressure of 29 psi absolute protects housing seals by limiting back-pressure on the drain line. The assembly weighs 132 lb without fluid, so handling equipment must be chosen to accommodate this mass during installation.
Technical Specifications
Case Volume
0.79 gal (3.0 L)
Displacement (vg Max)
140 cm3/rev (8.54 in3)
Flow At 1800 Rpm
66.6 gpm (252 L/min)
Max Case Pressure (abs)
29 psi (2 bar)
Max Flow At Nmax
66.6 gpm (252 L/min)
Max Inlet Pressure (abs)
435 psi (30 bar)
Max Permitted Speed (vg < Vg Max)
2100 rpm
Max Speed At Vg Max
1800 rpm
Min Inlet Pressure (abs)
12 psi (0.8 bar)
Nominal Pressure
4000 psi (280 bar)
Peak Pressure
5100 psi (350 bar)
Power At 1800 Rpm (280 Bar)
158 HP (118 kW)
Power At Nmax (280 Bar)
157 HP (117 kW)
Torque At Vg Max (100 Bar)
164 lb-ft (223 Nm)
Torque At Vg Max (280 Bar)
453 lb-ft (623 Nm)
Weight (without Fluid)
132 lb (60 kg)
1620 Old Apex Road
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