Bosch Rexroth | AA10VSO45DRG31R-PPA12K68-SO52
AA10VSO45DRG/31R-PPA12K68 SO52
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The AA10VSO45DRG/31R-PPA12K68 SO52 pump belongs to the A10VSO Variable Pumps series and is built by Bosch Rexroth for closed-loop hydraulic automation. It delivers 45 cm³ per revolution, which establishes the volume of fluid moved by each shaft turn. At the maximum displacement setting and 1800 rpm, the pump supplies 21.4 gpm, allowing medium flow circuits to be fed without auxiliary boosting. A shaft power demand of 50 hp (38 kW) at 1800 rpm and 280 bar indicates the drive motor size required for continuous duty. Under the same pressure, output torque reaches 148 lb-ft (200 Nm), providing predictable load matching with gearboxes or couplings. The unit tolerates a maximum working pressure of 5100 psi (350 bar), while its nominal rating of 4100 psi (280 bar) defines the level for long-term operation. A standard differential pressure of 290 psi (20 bar) across the displacement control spool ensures stable swash-plate positioning. The allowable pressure rise rate of 232,060 psi/s (16,000 bar/s) limits shock loading on connected actuators and pipework.
The internal case holds 0.264 gal (1.0 L) of leakage oil, and this volume helps dissipate heat and lubricate rotating groups. Cleanliness must be maintained at ISO 4406 class 20/18/15 so that valve plates and bearings achieve their expected life. Case pressure is restricted to 30 psi (2 bar) absolute, preventing seal extrusion during bypass flow. When set to full displacement the pump may run at 2600 rpm; if the displacement is reduced below the maximum setting the speed can increase to 3100 rpm, extending flow range without cavitation. The inlet line must provide at least 12 psi (0.8 bar) absolute to avert vapor formation, and outlet pressure must not fall below 145 psi (10 bar) so that control functions remain responsive. A pilot port can be loaded up to 5100 psi (350 bar) for remote compensator actuation. These limits, together with the specified speed ranges, help the pump maintain reliable service inside industrial hydraulic drives.
Technical Specifications
Case Volume
0.264 gal (1.0 L)
Displacement Per Revolution
45 cm3/rev
Drg Differential Pressure (std)
290 psi (20 bar)
Flow At 1800 Rpm (vg Max)
21.4 gpm
Fluid Cleanliness Class
ISO 4406 20/18/15
Max Case Pressure (abs)
30 psi (2 bar)
Max Perm Speed (vg < Vg Max)
3100 rpm
Max Speed (vg Max)
2600 rpm
Maximum Pressure
5100 psi (350 bar)
Minimum Inlet Pressure (abs)
12 psi (0.8 bar)
Minimum Outlet Pressure (abs)
145 psi (10 bar)
Nominal Pressure
4100 psi (280 bar)
Pilot Port Pressure Max
5100 psi (350 bar)
Power At 1800 Rpm, 280 Bar
50 HP (38 kW)
Rate Of Pressure Change Max
232060 psi/s (16000 bar/s)
Torque At 280 Bar (vg Max)
148 lb-ft (200 Nm)
1620 Old Apex Road
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