Bosch Rexroth | AA4VG90EP4D132R-NSF52F071LH
AA4VG90EP4D1/32R-NSF52F071LH
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The AA4VG90EP4D1/32R-NSF52F071LH variable pump is produced by Bosch Rexroth within the AA4VG Variable Pumps series. Designed for closed-loop hydrostatic transmissions, it supplies adjustable flow to hydraulic motors in automation systems. Its geometric displacement is 90 cm³ per revolution, establishing the theoretical volume delivered each shaft turn. The nominal speed of 3050 rpm defines the regular operating point, and at this speed the pump can deliver 275 l/min when set to maximum displacement, ensuring a steady supply to downstream circuits. A nominal pressure rating of 400 bar permits continuous high-pressure service, while the maximum pressure of 450 bar covers brief overloads created by load spikes. Minimum speed is limited to 500 rpm so internal hydrostatic bearings receive sufficient lubrication during low-flow conditions.
An integrated boost stage with a displacement of 19.6 cm³ per revolution maintains case filling and cylinder barrel lubrication; it operates at a nominal boost pressure of 25 bar and tolerates peaks up to 40 bar. The EP4 electro-proportional control is energized by a 24 V supply with a ±20% tolerance, and its nominal coil resistance of 22.7 Ω sets the electrical load. Control current is limited to 0.77 A to protect the solenoid, while an end-of-control value of 600 mA corresponds to minimum swashplate angle for rapid destroking. Intermittent speed capability reaches 3800 rpm, enabling short bursts of higher power demand. When operating at 5800 psi the shaft can transmit 183 kW, and the corresponding torque output is 573 Nm, giving designers clear limits for coupling and gearbox selection.
Technical Specifications
Boost Pump Displacement
19.6 cm³/rev (1.20 in³)
Boost Pump Maximum Pressure
40 bar (580 psi)
Boost Pump Nominal Pressure
25 bar (365 psi)
Ep4 Current Limit
0.77 A
Ep4 End Of Control Current
600 mA
Ep4 Nominal Resistance
22.7 Ω
Ep4 Solenoid Voltage
24 V (±20%)
Flow At 3050 Rpm, Vg Max
275 l/min (72.6 gpm)
Geometric Displacement
90 cm³/rev
Max Speed (intermittent)
3800 rpm
Maximum Pressure
450 bar (6500 psi)
Minimum Speed
500 rpm
Nominal Pressure
400 bar (5800 psi)
Nominal Speed
3050 rpm
Power At 5800 Psi
183 kW (245 hp)
Torque At 5800 Psi
573 Nm (423 lb-ft)
1620 Old Apex Road
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