Bosch Rexroth | AA4VG125EP4D132R-NSF52F001FH-S
AA4VG125EP4D1/32R-NSF52F001FH-S
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The AA4VG125EP4D1/32R-NSF52F001FH-S pump belongs to the AA4VG Variable Pumps series and is produced by Bosch Rexroth for closed-circuit hydraulic automation. It offers a displacement of 125 cm³ per revolution, allowing the circuit designer to set substantial flow with each shaft turn. A built-in boost pump provides 28.3 cm³ per revolution to maintain charge pressure and prevent cavitation. The pump operates at a nominal speed of 2850 rpm, matching common diesel engine outputs for mobile machines. At this speed and at maximum geometric volume, the flow reaches 356 l/min, supporting high actuator velocities. The nominal pressure rating of 400 bar defines the continuous working limit, while a maximum pressure of 450 bar covers short overload conditions. Shaft rotation is specified as clockwise to align with standard right-hand drive arrangements. The suction port uses a 1 7/8 in -12 UN thread, giving low inlet restriction for viscous fluids.
Intermittent operation is permitted up to 3450 rpm so the unit can handle brief speed spikes during acceleration, whereas a limited continuous ceiling of 3250 rpm protects bearings under sustained load. This separation between intermittent and limited speeds preserves bearing life during heavy duty cycles. Mechanical output torque reaches 796 Nm at 400 bar, indicating the drive motor size required to avoid stalling. Under the same pressure, hydraulic power delivery is 238 kW, providing a clear figure for prime mover selection. The EP4 electronic control runs on a 24 V supply, making the pump compatible with typical mobile electrical systems. Its solenoid coil has a resistance of 22.7 Ω, setting a static current of roughly 1.1 A when energized, and displacement control starts at 200 mA. Working ports A and B are sized at 1 1/4 in SAE J518, facilitating direct connection to high-pressure hoses or manifold blocks.
Technical Specifications
Boost Pump Displacement
28.3 cm³/rev
Control Voltage (ep4)
24 V
Direction Of Rotation
Clockwise
Displacement
125 cm³/rev
Flow At Nnom (vg Max)
356 l/min
Max Speed (intermittent)
3450 rpm
Max Speed (limited)
3250 rpm
Maximum Pressure
450 bar
Nominal Pressure
400 bar
Nominal Speed (nnom)
2850 rpm
Power At 400 Bar
238 kW
Solenoid Resistance
22.7 Ω
Start-of-control Current
200 mA
Suction Port S
1 7/8 in -12 UN
Torque At 400 Bar
796 Nm
Working Ports A/b
1 1/4 in SAE J518
1620 Old Apex Road
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