Bosch Rexroth | AA4VG125HD3D132R-NSF52F001D
AA4VG125HD3D1/32R-NSF52F001D
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The AA4VG125HD3D1/32R-NSF52F001D pump, produced by Bosch Rexroth for the AA4VG Variable Pumps series, supplies variable hydraulic flow to mobile and industrial automation loops. A geometric displacement of 125 cm³ per revolution sets the basic volume moved by each shaft turn, and at that full displacement the unit delivers 356 L/min at the rated speed of 2850 rpm, meeting high-demand actuator circuits. Torque reaches 796 Nm at 400 bar, so the prime mover must withstand this load when maximum output is required. The nominal working pressure is 5800 psi (400 bar), providing a stable operating point for continuous duty, while power draw at the same condition is 238 kW. Reliable lubrication is maintained by enforcing a minimum pump speed of 500 rpm, preventing boundary wear during low-flow operation.
The design also accepts brief pressure peaks up to 6500 psi (450 bar) and permits intermittent shaft speeds of 3450 rpm, though continuous service is limited to 3250 rpm to protect rotating elements. A pressure ramp rate of 9000 bar per second supports fast control responses, and the displacement controller needs at least 20 bar above case pressure to move the swashplate accurately. An internal boost stage displaces 28.3 cm³ per revolution to keep the inlet flooded, but suction conditions still require 0.5 bar absolute during cold start, 0.8 bar absolute in continuous running, and must not exceed 5 bar absolute to avoid shaft-seal overload. These parameters define the allowable envelope for hydraulic circuit designers who integrate the AA4VG125HD3D1/32R-NSF52F001D into closed-loop drive systems.
Technical Specifications
Boost Pump Displacement
28.3 cm³/rev
Flow At Nnom (vg Max)
356 l/min (94 gpm)
Geometric Displacement
125 cm³/rev
Maximum Pressure
6500 psi (450 bar)
Maximum Speed (intermittent)
3450 rpm
Maximum Speed (limited)
3250 rpm
Minimum Control Pressure (hd)
20 bar above case
Minimum Speed
500 rpm
Nominal Pressure
5800 psi (400 bar)
Power At Nnom (400 Bar)
238 kW (319 hp)
Rate Of Pressure Change
9000 bar/s
Rated Speed (nnom)
2850 rpm
Suction Port Max Pressure
5 bar abs
Suction Port Min Pressure (cold Start)
0.5 bar abs
Suction Port Min Pressure (cont.)
0.8 bar abs
Torque At Vg Max (400 Bar)
796 Nm (587 lb-ft)
1620 Old Apex Road
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