Bosch Rexroth | AA4VG125EP4D132R-NSF52F021FH
AA4VG125EP4D1/32R-NSF52F021FH
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The AA4VG125EP4D1/32R-NSF52F021FH pump is part of the AA4VG Variable Pumps series from Bosch Rexroth and is intended for closed-loop hydraulic automation. It features a geometric displacement of 125 cm³ per revolution, enabling variable output to match system demand. At 2850 rpm with the swashplate at maximum angle, it delivers 356 L/min, draws 238 kW at the drive shaft, and produces 796 Nm of torque. Continuous operation is permitted at the 400 bar nominal pressure, while short peaks can reach the 450 bar maximum. Cavitation is prevented by keeping inlet pressure above 0.8 bar absolute during high flow conditions.
A boost pump section with a 28.3 cm³ displacement supports the main stage and provides up to 25 bar to stabilize suction and feed the control circuit. The EP4 electronic regulator works on 24 V with a ±20 % tolerance, limits solenoid current to 0.77 A, begins control at 200 mA, and achieves full stroke at 600 mA. Reliable swashplate movement requires the control line to stay at least 20 bar above case pressure. The rotating group may run continuously up to the 3250 rpm limited speed, with intermittent peaks reaching 3450 rpm. These hydraulic and electronic parameters define the dynamic performance envelope expected from this pump in demanding motion control applications.
Technical Specifications
Boost Pump Displacement
28.3 cm³
Boost Pump Nominal Pressure
25 bar
Control Pressure Min (ep)
20 bar above case
Displacement
125 cm³/rev
Ep4 Control Voltage
24 V (±20%)
Ep4 Current Limit
0.77 A
Ep4 End Of Control Current
600 mA
Ep4 Start Of Control Current
200 mA
Flow At 2850 Rpm (vg Max)
356 L/min
Inlet Pressure Min (cont.)
0.8 bar abs
Maximum Pressure
450 bar
Nominal Pressure
400 bar
Power (400 Bar At 2850 Rpm)
238 kW
Speed Max (intermittent)
3450 rpm
Speed Max (limited)
3250 rpm
Torque (400 Bar At Vg Max)
796 Nm
1620 Old Apex Road
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