Bosch Rexroth | AA4VG56EP4D132R-NSC52F003DT
AA4VG56EP4D1/32R-NSC52F003DT
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The AA4VG56EP4D1/32R-NSC52F003DT pump is manufactured by Bosch Rexroth within the AA4VG Variable Pumps series. It is applied in closed-loop hydraulic drives where variable displacement provides precise actuator control. The unit offers a maximum geometric displacement of 56 cm³ per revolution, letting circuit designers match flow to changing load demands. At the nominal speed of 3600 rpm with zero differential pressure it reaches 202 l/min, ensuring fast response in mobile equipment. A minimum operating speed of 500 rpm keeps internal lubrication stable during low-duty cycles. When the circuit is held at the nominal pressure of 400 bar, the pump can deliver 134 kW, and the corresponding shaft torque is 357 Nm for predictable power transmission to the drivetrain. These ratings allow the pump to sustain continuous duty in excavators, presses, and marine steering systems without exceeding the thermal envelope.
For transient events the pump withstands a maximum pressure of 450 bar and an intermittent speed of 4500 rpm, giving extra headroom during rapid load reversals. The integrated boost stage works at a nominal 25 bar and may climb to 40 bar, while its own displacement is 11.6 cm³ per revolution so case flushing is maintained under all conditions. A 1 1/4-inch, 14-tooth, 12/24DP spline couples the shaft to diesel or electric prime movers without fretting. Electronic control is handled by the ep4 solenoid package which operates at 24 V; its coil has a resistance of 22.7 Ω, and the associated current limit is 0.77 A to protect the driver circuit. Together these features enable smooth displacement adjustment and rapid swash-plate positioning, ensuring stable hydraulic automation across a wide operating envelope.
Technical Specifications
Boost Max Pressure
40 bar
Boost Nominal Pressure
25 bar
Boost Pump Displacement
11.6 cm³/rev
Current Limit (ep4)
0.77 A
Displacement (vg Max)
56 cm³/rev
Flow @ Nnom, Vg Max
202 l/min
Intermittent Max Speed
4500 rpm
Maximum Pressure
450 bar
Minimum Speed
500 rpm
Nominal Pressure
400 bar
Nominal Speed (Δp=0)
3600 rpm
Power @ 400 Bar
134 kW
Shaft Spline
1 1/4 in 14T 12/24DP
Solenoid Resistance (ep4)
22.7 Ω
Solenoid Voltage (ep4)
24 V
Torque @ 400 Bar
357 Nm
1620 Old Apex Road
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