Bosch Rexroth | AA10VO74DFR31L-PSC92K02-TEST-CODE-001
AA10VO74DFR/31L-PSC92K02 Test Code 001
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The AA10VO74DFR/31L-PSC92K02 Test Code 001 pump is produced by Bosch Rexroth within the A10VSO Variable Pumps series. It functions as a variable-displacement axial piston unit for hydraulic automation. The pump uses DFR pressure/flow control to maintain output under changing load demands. The pressure differential for the DFR control is preset to 14 bar so the compensator reacts promptly to system variations, and hysteresis is limited to 4 bar to keep flow adjustments stable. A nominal pressure rating of 280 bar defines continuous duty capability, while the maximum pressure of 350 bar sets the upper limit for transient conditions. Counter-clockwise rotation is specified for correct shaft orientation in powertrain layouts. The mounting flange follows the SAE J744 pattern, allowing direct coupling to standard prime movers, and the working ports comply with ISO 6162-1 to match common high-pressure pipework.
Fluid entering the pump must meet ISO 4406 class 20/18/15 cleanliness to protect the rotating group from abrasion. A maximum fluid temperature of 115 °C permits operation with high-temperature oil found in closed-loop circuits. Case pressure is restricted to 2 bar absolute to prevent seal damage, whereas inlet pressure may rise to 10 bar to support flooded suction arrangements. The pump requires at least 10 bar absolute at port B for stable control and a minimum inlet pressure of 0.8 bar absolute to avoid cavitation. The pilot port can withstand up to 350 bar so the control system can transmit full command pressure, and its 7/16-20 UNF-2B thread provides a unified connection for pilot lines.
Technical Specifications
Control Type
DFR (Pressure/Flow)
Dfr Differential Pressure Setting
14 bar
Dfr Hysteresis Max
4 bar
Fluid Cleanliness Class
ISO 4406 20/18/15
Max Fluid Temperature
115 °C
Maximum Case Pressure (abs)
2 bar
Maximum Inlet Pressure
10 bar
Maximum Pressure
350 bar
Minimum B-port Pressure (abs)
10 bar
Minimum Inlet Pressure (abs)
0.8 bar
Mounting Flange Standard
SAE J744
Nominal Pressure
280 bar
Pilot Port Max Pressure
350 bar
Pilot Port Thread
7/16-20 UNF-2B
Rotation Direction
Counter-Clockwise
Working Port Standard
ISO 6162-1
1620 Old Apex Road
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