Bosch Rexroth | AA10VSO28DRG31R-PSA12N00
AA10VSO28DRG/31R-PSA12N00
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The AA10VSO28DRG/31R-PSA12N00 is an axial piston pump in the A10VSO Variable Pumps series manufactured by Bosch Rexroth for closed-loop hydraulic automation. It delivers a displacement of 28 cm³ per revolution so circuit designers can predict the volume moved with each shaft turn. The unit is rated for a nominal pressure of 4,100 psi and tolerates peaks to 5,100 psi, enabling reliable work in high-load presses and test stands. With the swashplate at maximum angle and the shaft turning 1,800 rpm, it supplies 13.3 gpm, while its nominal speed raises flow to 22 gpm; both values govern actuator speed and heat generation. A 7/8-inch, 13-tooth, 16/32 DP spline shaft transfers torque to the rotating group, and the drive can accept up to 145 lb-ft without overstress. Case oil exits through a 3/4-16 UNF drain port that prevents excessive housing pressure and returns leakage fluid to tank.
The rotating assembly reaches 3,000 rpm at full displacement and 3,600 rpm when the swashplate is reduced, giving designers flexibility to balance speed and efficiency. DRG control holds a differential setting of 290 psi, maintaining steady flow despite downstream fluctuations. A 7/16-20 UNF pilot port accepts external control pressure, the main outlet uses a 3/4-inch SAE flange sized for high-pressure hoses, and inlet oil is drawn through a 1 1/4-inch SAE flange that limits velocity and cavitation. At the 4,100 psi working point the shaft transmits 92 lb-ft, aiding coupling selection, and the assembly weighs 40 lb, allowing single-person installation on mobile or stationary frames. These specifications position the pump for variable-flow, high-pressure circuits that demand compact mass and consistent response.
Technical Specifications
Displacement
28 cm³/rev
Drain Port Size
3/4-16 UNF
Drg Differential Pressure (std)
290 psi (20 bar)
Drive Shaft (s)
7/8 in 13T 16/32DP
Flow At 1800 Rpm (vg Max)
13.3 gpm (50 L/min)
Max Flow At Nnom (vg Max)
22 gpm (84 L/min)
Max Input Torque (s Shaft)
145 lb-ft
Max Speed (vg < Vg Max)
3600 rpm
Max Speed (vg Max)
3000 rpm
Maximum Pressure
5100 psi (350 bar)
Nominal Pressure
4100 psi (280 bar)
Pilot Port Size
7/16-20 UNF
Pressure Port Size
3/4 in SAE flange
Suction Port Size
1 1/4 in SAE flange
Torque At 4100 Psi (vg Max)
92 lb-ft (125 Nm)
Weight Without Through Drive
40 lb (18 kg)
1620 Old Apex Road
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