Bosch Rexroth | AA4VG71EP3D132L-NSF52F001DP
AA4VG71EP3D1/32L-NSF52F001DP
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The AA4VG71EP3D1/32L-NSF52F001DP variable pump is manufactured by Bosch Rexroth as part of the AA4VG Variable Pumps series. Designed for hydraulic automation, it converts mechanical input into controlled fluid flow for mobile or industrial drives. The displacement per revolution is 71 cm³, determining the volume of oil delivered each shaft turn. At the nominal speed of 3300 rpm, the pump supplies 234 l/min to downstream actuators. A nominal pressure of 400 bar sets the continuous operating limit, while a maximum pressure of 450 bar provides overload capacity during brief load peaks. When the pressure drop is 400 bar, the unit transmits 156 kW of power, and the corresponding torque is 452 Nm, matching engine output to hydraulic demand. The minimum low-pressure side requirement is 10 bar above case pressure to secure inlet conditions and bearing lubrication throughout every duty cycle.
During short duty periods the pump can accelerate to an intermittent maximum speed of 4100 rpm, yet continuous service is limited to 3600 rpm to control heat and wear. A dedicated boost stage with a displacement of 19.6 cm³ supplies make-up oil; its nominal boost pressure of 25 bar maintains circuit charge, and a boost maximum pressure of 40 bar counters transient cavitation. Electronic pressure regulation is handled by an EP3 solenoid that operates on 12 V and presents a coil resistance of 5.5 Ω, allowing direct connection to common vehicle controllers. The control circuit needs at least 20 bar above case pressure to shift the EP valve reliably, completing the servo mechanism that trims swashplate angle and flow. These parameters define safe dynamic limits and support integration of the pump into closed-loop hydraulic systems.
Technical Specifications
Boost Maximum Pressure
40 bar
Boost Nominal Pressure
25 bar
Boost Pump Displacement
19.6 cm3
Displacement Per Rev
71 cm3
Ep3 Nominal Resistance
5.5 Ω
Ep3 Solenoid Voltage
12 V
Flow At Nominal Speed (vg Max)
234 l/min
Intermittent Maximum Speed
4100 rpm
Maximum Pressure
450 bar
Maximum Speed (limited)
3600 rpm
Minimum Control Pressure (ep)
20 bar (above case)
Minimum Low-pressure Side
10 bar (above case)
Nominal Pressure
400 bar
Nominal Speed
3300 rpm
Power At Δp 400 Bar
156 kW
Torque At Δp 400 Bar
452 Nm
1620 Old Apex Road
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