Bosch Rexroth | A10VO28DFR31R-PSC61N00
A10VO28DFR/31R-PSC61N00
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The A10VO28DFR/31R-PSC61N00 variable pump belongs to the A10VSO Variable Pumps series from Bosch Rexroth and supplies pressurized fluid for hydraulic automation systems. Its DFR pressure and flow control adjusts swashplate position to maintain setpoints under varying load. A displacement of 28 cm³ per revolution fixes the volume moved each shaft turn, and flow travels from port S to port B so circuit lines can be planned accordingly. The continuous operating limit is 280 bar nominal pressure, giving designers a stable working range. When driven at 1800 rpm with maximum displacement, the pump outputs 13.2 gpm to power medium-capacity actuators. A maximum speed of 3000 rpm at full displacement extends suitability to higher engine speeds, while a case drain ceiling of 2 bar keeps shaft seals within their rating. Rear port orientation labeled as version 61 lets the unit mount flush against gearbox housings or manifold blocks in compact power units.
At 3000 rpm the pump reaches 22.2 gpm, supporting applications that need short bursts of higher flow. With displacement reduced, the permitted speed increases to 3600 rpm, giving extra throughput without overstressing piston assemblies. A torque demand of 91 lb-ft at 280 bar guides selection of the drive motor or prime mover. The inlet side operates down to 0.8 bar absolute for suction-lift reservoirs and up to 30 bar when a charge pump is used. Structural integrity endures pressure spikes to 350 bar, covering brief overload events common in rapid load changes. The assembled weight of 33 lb allows one person to position the pump during installation in both mobile and stationary hydraulic power packs.
Technical Specifications
Case Drain Pressure Max (abs)
2 bar
Control Type
DFR (Pressure/Flow Control)
Direction Of Flow
S to B
Displacement
28 cm³/rev
Flow At 1800 Rpm (vgmax)
13.2 gpm
Inlet Pressure Max (abs)
30 bar
Inlet Pressure Min (abs)
0.8 bar
Max Flow (at 3000 Rpm)
22.2 gpm
Max Speed (at Vgmax)
3000 rpm
Max Torque (280 Bar)
91 lb-ft
Nominal Pressure
280 bar
Peak Pressure
350 bar
Permitted Speed (reduced Vg)
3600 rpm
Port Orientation
Rear (Version 61)
Weight
33 lb
1620 Old Apex Road
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