Bosch Rexroth | AA10VSO71DR31R-VKC92K05
AA10VSO71DR/31R-VKC92K05
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The AA10VSO71DR/31R-VKC92K05 variable pump is manufactured by Bosch Rexroth for the A10VSO Variable Pumps series. It supplies hydraulic power by adjusting piston stroke to match system demand. The displacement of 71 cm³ per revolution sets the volume moved each shaft turn, while a flow of 33.8 gpm at 1800 rpm indicates delivery under common motor speed. At the nominal rotational speed the pump can provide 41.2 gpm, supporting circuits that require higher throughput. Continuous operation at full displacement is limited to 2200 rpm, and a higher limit of 2600 rpm applies when the displacement is reduced to protect internal components. A rotary group moment of inertia of 0.197 lb-ft² helps the unit accelerate quickly during load changes. The internal case holds 0.420 gal of fluid to lubricate and cool moving parts, and the configuration with a through drive brings total mass to 84 lb (38 kg) which influences mounting requirements.
The nominal working pressure is 280 bar so common mobile or industrial systems can run without continuous overload, whereas the design permits a maximum pressure of 350 bar for short duty peaks. Shaft torque reaches 233 lb-ft at 280 bar and full displacement, converting hydraulic load into mechanical reaction that must be absorbed by the drive train. At the same operating point the shaft needs 98 HP, defining motor sizing. The allowable pressure rise rate of 232060 psi per second lets control valves shift rapidly without damaging the pump. A through-drive rating of 319 lb-ft enables connection of an auxiliary pump without excess torsion on the coupling. The inlet circuit must maintain at least 0.8 bar absolute to prevent cavitation, and the case drain line should not exceed 2 bar absolute so seals remain within design limits.
Technical Specifications
Case Volume
0.420 gal
Displacement Per Revolution
71 cm3/rev
Flow At 1800 Rpm (vg Max)
33.8 gpm
Flow At Nnom (vg Max)
41.2 gpm
Max Case Drain Pressure (abs)
2 bar
Max Pressure Rate Of Change
232060 psi/s
Max Speed At Reduced Vg
2600 rpm
Max Speed At Vg Max
2200 rpm
Max Through-drive Torque (k)
319 lb-ft
Maximum Pressure
350 bar
Min Inlet Pressure (abs)
0.8 bar
Moment Of Inertia (rotary Group)
0.197 lb-ft²
Nominal Pressure
280 bar
Power At Nnom (280 Bar)
98 HP
Torque At 280 Bar (vg Max)
233 lb-ft
Weight With Through Drive
84 lb (38 kg)
1620 Old Apex Road
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