Bosch Rexroth | AA4VG71EP4D132L-NSF52F001DP
AA4VG71EP4D1/32L-NSF52F001DP
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The AA4VG71EP4D1/32L-NSF52F001DP variable pump belongs to the AA4VG Variable Pumps series from Bosch Rexroth and is intended for closed-loop hydraulic drives that demand automatic adjustment of flow and pressure. The unit features a geometric displacement of 71 cm³ per revolution, delivering a consistent volume for medium-size actuators. Its shaft turns counter-clockwise to suit common engine flywheel layouts. At a nominal speed of 3300 rpm the pump supplies 234 l/min, which supports rapid actuator movement in mobile machinery. The housing is rated for 400 bar and withstands pressure peaks up to 450 bar, enabling high-force circuits while keeping hose sizes moderate. When loaded to 400 bar the drive requires 156 kW and transmits 452 Nm of torque, data used to match engines and couplings. A 1 in SAE J518 working port provides direct connection to standard high-pressure manifolds.
An integrated charge stage adds 19.6 cm³ per revolution of boost flow, maintaining lubrication and compensating for leakage in the closed circuit. Cavitation is avoided by holding inlet pressure above 0.8 bar absolute, and the charge relief can be adjusted up to 40 bar to keep the loop filled during load changes. The EP4 electro-proportional control operates on a 24 V supply that may vary by ±20 %, making it compatible with vehicle electrical systems. Swashplate movement begins at 200 mA and reaches full stroke at 600 mA, providing linear flow control across the range. An internal limiter caps drive current at 0.77 A to protect the coil and prevent unintended over-command. These charge and control parameters guide proper integration of the pump into electronically regulated hydrostatic transmissions.
Technical Specifications
Boost Pump Displacement
19.6 cm3/rev
Control Current End (ep4)
600 mA
Control Current Start (ep4)
200 mA
Control Voltage (ep4)
24 V (±20%)
Current Limit (ep4)
0.77 A
Direction Of Rotation
Counter-Clockwise
Displacement
71 cm3/rev
Flow At Nominal Speed (vgmax)
234 l/min
Max Boost Pressure
40 bar
Maximum Pressure
450 bar
Minimum Suction Pressure
0.8 bar abs
Nominal Pressure
400 bar
Nominal Speed
3300 rpm
Power At 400 Bar
156 kW
Torque At 400 Bar
452 Nm
Working Port Size
1 in (SAE J518)
1620 Old Apex Road
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