AA4VG125EP4D1/32R-NSF52F001DP

The AA4VG125EP4D1/32R-NSF52F001DP variable pump is manufactured by Bosch Rexroth within the AA4VG Variable Pumps series for closed-circuit hydraulic drives. It offers a geometric displacement of 125 cm³ per revolution, which establishes the basic volume of oil the pump can deliver each shaft turn. A rated flow of 356 l/min supports medium to high power actuators by supplying the required oil volume at design speed. The nominal speed of 2850 rpm defines the typical shaft velocity used to reach rated flow without overstressing the rotating group. Clockwise rotation is specified, so machine designers must align the prime mover accordingly. A maximum pressure rating of 450 bar allows the pump to work in high-pressure circuits such as winch or travel drives, while the nominal pressure of 400 bar indicates the continuous working limit for steady operation. When operated at 400 bar, the pump can transmit 238 kW, which matches the power that must be available from the driving engine or motor. Under the same pressure, the drive shaft must withstand 796 Nm of torque, guiding the selection of couplings and mounting hardware.

A boost pump displacement of 28.3 cm³ per revolution provides auxiliary charge flow that keeps the main circuit filled and lubricated during load changes. The maximum speed capability of 3250 rpm gives extra headroom for transient conditions or overspeed events. A 24 V control solenoid voltage allows direct integration with common mobile machine electrical systems. The electronic control has a current limit of 0.77 A, which protects the coil and driver circuit from overload. Control port threads of 9/16-18 UNF-2B on ports X1 and X2 standardize the connection of pressure or pilot lines for displacement control. An identical 9/16-18 UNF-2B thread on the pilot port PS simplifies hose selection across control functions. The suction port uses a 1 7/8-12 UN-2B thread to accept large-diameter lines that minimize inlet losses, while the working ports A and B are sized at 1 1/4 in to accommodate the main pressure hoses carrying flow to hydraulic motors or cylinders.