Bosch Rexroth | AA4VG56EP4D132R-NSC52F005DP
AA4VG56EP4D1/32R-NSC52F005DP
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The AA4VG56EP4D1/32R-NSC52F005DP pump belongs to the AA4VG Variable Pumps series and is manufactured by Bosch Rexroth for closed loop hydraulic automation. The unit uses an axial piston design with a geometric displacement of 56 cm³ per revolution so the controller can vary output flow precisely under changing load. When set to maximum displacement, the pump delivers 202 L per minute, providing high volume circulation for large actuators. A nominal operating pressure of 400 bar defines continuous duty limits, while a nominal speed of 3600 rpm aligns with typical diesel engine PTO shafts. At 400 bar the shaft transmits 134 kW of power, and the hydraulic group releases 357 Nm of torque to drive downstream circuits. Electrical actuation relies on a 24 V ep4 control voltage that matches common mobile machine supplies, and spool movement begins at a control current of 200 mA, allowing fine metering as soon as the electronics energize.
Current through the ep4 solenoid can rise to 600 mA to command full stroke, giving the controller a broad adjustment range. An internal boost pump with 11.6 cm³ per revolution charges the case to prevent cavitation and supports cooling oil replenishment. The housing retains 1.5 L of case volume to capture leakage flow and dissipate heat before oil returns to the reservoir. For transient events the pump can withstand a maximum pressure of 450 bar, and intermittent speed peaks of 4500 rpm help machines accelerate without losing flow. The continuous upper speed is limited to 3900 rpm to protect bearings, while a minimum speed of 500 rpm ensures the swash plate remains lubricated during slow idling. A maximum input torque figure of 602 Nm defines the mechanical loading on the S-shaft, guiding coupling and prime mover selection.
Technical Specifications
Boost Pump Displacement
11.6 cm³/rev
Case Volume
1.5 L
Control Current End (ep4)
600 mA
Control Current Start (ep4)
200 mA
Control Voltage (ep4)
24 V
Displacement (geometric)
56 cm³/rev
Flow At Max Displacement (nnom)
202 L/min
Max Input Torque (s Shaft)
602 Nm
Max Speed (intermittent)
4500 rpm
Max Speed (limited)
3900 rpm
Maximum Pressure
450 bar
Minimum Speed
500 rpm
Nominal Pressure
400 bar
Nominal Speed
3600 rpm
Power At 400 Bar
134 kW
Torque At 400 Bar
357 Nm
1620 Old Apex Road
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