Bosch Rexroth | AA4VG125HWD132L-NSF52F001F-S
AA4VG125HWD1/32L-NSF52F001F-S
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The AA4VG125HWD1/32L-NSF52F001F-S axial piston pump is produced by Bosch Rexroth in the AA4VG Variable Pumps series for closed-loop hydraulic drives. With a displacement of 125 cm³ per revolution, it supplies the main circuit with oil over a wide speed range. The unit is set for counter-clockwise rotation, which defines the port orientation in typical transmission installations. During standard duty it runs at a nominal speed of 2850 rpm, yet it can operate down to 500 rpm when slow positioning is required. At full displacement it delivers 356 l/min, providing the flow needed for large mobile or industrial actuators. The pressure envelope reaches 400 bar in continuous service and peaks at 450 bar for short load spikes, so valve blocks can be sized accordingly. Under this 400 bar condition the shaft transmits 796 N·m of torque and draws 238 kW of mechanical power, data that assists in selecting couplings and prime movers.
The pump integrates a built-in charge stage; its boost section moves 28.3 cm³ per revolution to maintain case filling and cavitation resistance. Boost pressure is rated at 25 bar for normal running and can rise to 40 bar when cold start or rapid load changes demand extra inlet pressure. A 2.1 l case volume stores leakage oil, allowing thermal expansion without forcing fluid past the shaft seal. The rotating group moment of inertia is 0.0232 kg·m², so acceleration calculations for drive motors can be completed accurately. Limited-duty speed tops out at 3250 rpm, while an intermittent ceiling of 3450 rpm is available for brief overspeed events. These speed limits guide electronic control algorithms to prevent excessive bearing load. Together these parameters define the dynamic and endurance behavior of the AA4VG pump within hydrostatic transmissions and other high-performance hydraulic systems.
Technical Specifications
Boost Displacement
28.3 cm3/rev
Boost Maximum Pressure
40 bar
Boost Nominal Pressure
25 bar
Case Volume
2.1 l
Direction Of Rotation
Counter-Clockwise
Displacement
125 cm3/rev
Flow At Vgmax (nnom)
356 l/min
Max Speed (intermittent)
3450 rpm
Max Speed (limited)
3250 rpm
Maximum Pressure
450 bar
Minimum Speed
500 rpm
Moment Of Inertia
0.0232 kg m2
Nominal Pressure
400 bar
Nominal Speed
2850 rpm
Power At 400 Bar (nnom, Vgmax)
238 kW
Torque At 400 Bar
796 Nm
1620 Old Apex Road
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