Bosch Rexroth | A10VSO18DFR131R-VPA12N00
A10VSO18DFR1/31R-VPA12N00
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The A10VSO18DFR1/31R-VPA12N00 variable pump belongs to the A10VSO Variable Pumps series and is manufactured by Bosch Rexroth for closed-loop hydraulic automation. With a geometric displacement of 18 cm³ per revolution, the unit meters a known oil volume each shaft turn, which assists circuit sizing. At 1800 rpm it supplies 32 L/min, covering standard actuator demand, while a maximum flow of 59 L/min is attainable at nominal speed for higher throughput. The drive can run at up to 3900 rpm, yet operation at full displacement is limited to 3300 rpm to manage internal loading. A 28 kW output power ceiling protects connected components from over-load. The 0.4 L case volume collects leakage oil for bearing lubrication and heat removal, and an overall weight of 12.9 kg allows one-person handling during installation.
The DFR1 compensator is preset to a 14 bar differential so the pump trims displacement once outlet pressure exceeds that threshold, maintaining stable motion. Flow deviation at NG18 size is held to 0.9 L/min to keep volumetric accuracy when the compensator acts. Continuous operation is rated for 280 bar, and short peaks can reach 350 bar without damage. At the nominal pressure the shaft transmits up to 80 Nm of torque for efficient power transfer. Control oil enters through a pilot port threaded 7/16-20 UNF, while the main pressure line uses a 3/4-inch port B; both match common hose fittings. A 1-inch suction port S reduces inlet losses and helps prevent cavitation during high flow demand.
Technical Specifications
Case Volume
0.4 L
Dfr1 Δp Standard Setting
14 bar
Flow At 1800 Rpm
32 L/min
Flow Deviation (ng18, Dfr1)
0.9 L/min
Geometric Displacement
18 cm³/rev
Max Flow At Nnom
59 L/min
Max Output Power
28 kW
Max Permissible Speed
3900 rpm
Max Speed At Vgmax
3300 rpm
Max Torque At 280 Bar
80 Nm
Maximum Pressure
350 bar
Nominal Pressure
280 bar
Pilot Port X Thread
7/16-20 UNF
Pressure Port B Size
3/4 in
Suction Port S Size
1 in
Weight (without Through Drive)
12.9 kg
1620 Old Apex Road
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