Bosch Rexroth | AA4VG71HD3DT132L-NSF52F021D-S
AA4VG71HD3DT1/32L-NSF52F021D-S
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The AA4VG71HD3DT1/32L-NSF52F021D-S variable pump from Bosch Rexroth belongs to the AA4VG Variable Pumps series and supplies adjustable hydraulic flow for mobile drivetrains and industrial automation. Its geometric displacement is 71 cm³ per revolution, so every rotation of the shaft delivers a defined fluid volume to the circuit. When the pump turns at nominal speed, the outlet reaches 234 l/min, providing sufficient flow for high-demand actuators. The hydraulic group is rated for a nominal pressure of 400 bar, and at this pressure the drive motor must furnish 156 kW to keep the unit at full load. Continuous operation is allowed down to a minimum speed of 500 rpm and up to a mechanically limited 3600 rpm. A rotating group moment of inertia of 0.0097 kg·m² minimizes startup load yet stores enough energy for smooth rotation. Fast command changes are supported because the pump can track a pressure rise of 9000 bar per second without instability.
For transient events, the same pump tolerates a maximum pressure of 450 bar, and it may briefly accelerate to 4100 rpm during intermittent duty cycles without mechanical overstress. An internal boost stage with a displacement of 19.6 cm³ per revolution feeds the main inlet, keeping the pistons flooded and preventing cavitation. The housing holds 1.3 l of case oil, which absorbs leakage flow and removes heat from the rotating parts. Swashplate movement remains reliable because the control circuit requires at least 20 bar above case pressure to shift the angle. When operating at the nominal 400 bar, the shaft transmits 452 Nm of torque to the pump, a value that assists designers in sizing couplings and prime movers. External connections are straightforward: the suction line attaches to a 1 5/8 in -12 UN-2B threaded port, while pressure lines use 1 in SAE J518 working ports to match common hydraulic hose fittings.
Technical Specifications
Boost Pump Displacement
19.6 cm³/rev
Case Volume
1.3 l
Flow At Nominal Speed
234 l/min
Geometric Displacement
71 cm³/rev
Maximum Pressure
450 bar
Maximum Speed (intermittent)
4100 rpm
Maximum Speed (limited)
3600 rpm
Minimum Control Pressure (hd)
20 bar (above case)
Minimum Speed
500 rpm
Moment Of Inertia
0.0097 kg·m²
Nominal Pressure
400 bar
Power At 400 Bar
156 kW
Rate Of Pressure Change Max
9000 bar/s
Suction Port Thread (s)
1 5/8 in -12 UN-2B
Torque At 400 Bar
452 Nm
Working Port Size (a, B)
1 in (SAE J518)
1620 Old Apex Road
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