Bosch Rexroth | AA4VG71EP4DT132L-NSF52F001PH
AA4VG71EP4DT1/32L-NSF52F001PH
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The AA4VG71EP4DT1/32L-NSF52F001PH variable pump belongs to the AA4VG Variable Pumps series from Bosch Rexroth and supplies closed-circuit hydraulic drives with modulated flow and pressure. Its geometric displacement is 71 cm³ per revolution, allowing proportional control of actuator velocity in mobile machinery. At the nominal speed of 3300 rpm the pump delivers up to 234 l/min, so designers can size systems for high travel or work-cycle demands. The unit sustains a nominal pressure of 400 bar (5800 psi) and produces 452 Nm of output torque at that load for efficient power transfer from the prime mover. A moment of inertia of 0.0097 kg·m² supports rapid swashplate adjustments and dynamic motor response. With a case volume of 1.3 l the housing retains adequate oil for bearing lubrication and thermal stability, while a minimum operating speed of 500 rpm prevents boundary lubrication during low-flow standby conditions.
An internal boost stage rated at 19.6 cm³ per revolution supplies control oil to compensate for leakage and maintain servo stability. For short duty peaks the pump can be driven up to 4100 rpm, giving additional output without oversizing the prime mover. The design permits a maximum working pressure of 450 bar (6500 psi) for brief load spikes, provided suction pressure remains between 0.8 and 5 bar absolute to avoid cavitation. Control circuitry requires at least 20 bar above case pressure, and the low-pressure side of the circuit must stay 10 bar above case to sustain hydrostatic bearing pockets. Fluid entering the pump should meet ISO 4406 class 20/18/15 so that sliding surfaces remain free of abrasive wear. These limits help preserve efficiency and reliability in automated hydraulic systems that rely on fast, repeatable displacement changes.
Technical Specifications
Boost Pump Displacement
19.6 cm³/rev
Case Volume
1.3 l
Displacement
71 cm³/rev
Flow At Nnom, Vg Max
234 l/min
Fluid Cleanliness
ISO 4406 20/18/15
Max Speed (intermittent)
4100 rpm
Max Suction Pressure
5 bar (absolute)
Maximum Pressure
450 bar (6500 psi)
Min Control Pressure (ep)
20 bar (above case)
Min Low-pressure Side
10 bar (above case)
Min Speed
500 rpm
Min Suction Pressure
0.8 bar (absolute)
Moment Of Inertia
0.0097 kg·m²
Nominal Pressure
400 bar (5800 psi)
Nominal Speed
3300 rpm
Torque At 400 Bar
452 Nm
1620 Old Apex Road
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