AA4VG90HD3DM1/32R-NSF52FXX1F-S

The AA4VG90HD3DM1/32R-NSF52FXX1F-S pump belongs to the AA4VG Variable Pumps series and is manufactured by Bosch Rexroth for closed-loop hydraulic automation where variable flow and high pressure are required. Its geometric displacement is 90 cm³ per revolution, so the control system can modulate output by adjusting the swashplate angle. When operated at the nominal speed of 3050 rpm with maximum displacement, the pump supplies 275 L/min, ensuring adequate fluid volume for demanding actuators. Under the same conditions at 400 bar, the drive must deliver 183 kW and 573 Nm, data that guides electric or diesel prime-mover selection. Continuous operation is supported by a nominal pressure of 400 bar, while a maximum pressure allowance of 450 bar accommodates short transients. A permitted pressure rise of 9000 bar per second limits the severity of load shocks in fast cycling equipment. The internal case holds 1.5 L of oil, providing space for leakage collection and thermal buffering.

For speed-dependent control, the pump accepts a continuous shaft speed of 3300 rpm, allowing high output while keeping bearing loads within design limits, and it tolerates intermittent peaks up to 3800 rpm for short overload events such as acceleration phases. Reliable lubrication of the rotating group requires at least 500 rpm, so control software must prevent stalling below this threshold. The S-shaft can transmit up to 1640 Nm, which defines the mechanical limit for torsional loading under maximum drive power. A through-drive interface rated at 822 Nm permits an auxiliary pump to be driven in series without oversizing the coupling. To prevent cavitation, an integrated boost stage displaces 19.6 cm³ per revolution at 20 bar, sustaining positive charge pressure across the main inlet. The suction port needs a minimum absolute pressure of 0.8 bar, guiding reservoir placement and line sizing. Together, these limits support stable flow regulation and pressure generation across hydrostatic transmissions used in mobile or industrial machinery.