Bosch Rexroth | AA4VG125HD3D132L-NSF52F001D
AA4VG125HD3D1/32L-NSF52F001D
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The AA4VG125HD3D1/32L-NSF52F001D variable pump is produced by Bosch Rexroth within the AA4VG Variable Pumps series. It is intended to supply pressurized hydraulic fluid in closed-loop drive circuits where variable flow is required for automated motion. The geometric displacement of 125 cm³ per revolution defines the pump’s main delivery volume, while an internal boost pump delivers 28.3 cm³ per revolution to maintain charge pressure and cooling. When driven at its nominal speed of 2850 rpm, the unit provides up to 356 l/min, allowing large actuators to move at commanded rates. A minimum speed of 500 rpm is specified to keep internal bearings lubricated during slow-running cycles. Continuous operation is permitted at 400 bar, and at this pressure the shaft must transmit 796 Nm of torque and 238 kW of mechanical power to sustain flow. These parameters outline the pump’s baseline duty for machine tools, presses, and mobile hydrostatic transmissions.
The hydraulic circuit can be over-pressurized to 450 bar for short periods, giving extra force during peak loads. Intermittent speed may rise to 3450 rpm, yet continuous operation is limited to 3250 rpm to protect rotating groups. Rapid command changes are supported by a maximum angular acceleration of 14 000 rad/s², a figure made feasible by a rotating assembly that carries only 0.0232 kg·m² of inertia. The stroking piston that varies displacement accepts up to 40 bar in its chamber, enabling swift swash-plate adjustment without external boosters. Displacement changes begin when the pilot pressure reaches 6 bar and finish at 18 bar, so standard proportional valves can modulate flow precisely. Together, these limits define the dynamic envelope of the pump, ensuring it can follow aggressive control profiles while avoiding cavitation or mechanical overload in automated hydraulic systems.
Technical Specifications
Boost Pump Displacement
28.3 cm³/rev
Geometric Displacement
125 cm³/rev
Max Angular Acceleration
14000 rad/s²
Max Flow At Nominal Speed
356 l/min
Max Speed (intermittent)
3450 rpm
Max Speed (limited)
3250 rpm
Maximum Pressure
450 bar
Minimum Speed
500 rpm
Moment Of Inertia (jtw)
0.0232 kg·m²
Nominal Pressure
400 bar
Nominal Speed
2850 rpm
Pilot Pressure End (hd)
18 bar
Pilot Pressure Start (hd)
6 bar
Power At 400 Bar
238 kW
Stroking Chamber Port Max Pressure
40 bar
Torque At 400 Bar
796 Nm
1620 Old Apex Road
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