Bosch Rexroth | AA4VG56EP4D132R-NSC52F025DP-S
AA4VG56EP4D1/32R-NSC52F025DP-S
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The AA4VG56EP4D1/32R-NSC52F025DP-S variable pump is produced by Bosch Rexroth within the AA4VG Variable Pumps series for closed-loop hydrostatic drives. It delivers 56 cm³ per revolution, establishing the maximum volumetric displacement and thus the theoretical flow per shaft rotation. At the nominal speed of 3600 rpm the pump produces 202 L/min, providing the required oil flow for medium-size traction or travel circuits. Continuous operation is supported at 5 800 psi, so the nominal pressure sets the sustained load capacity of the housing and rotating group. A boost pressure of 365 psi maintains positive inlet conditions and prevents cavitation during dynamic duty. When the system is pressurized to 400 bar the shaft transmits 134 kW and 357 Nm, numbers that define power draw and torque demand on the prime mover. Clockwise rotation is specified, ensuring mechanical alignment with engines or electric motors designed for right-hand drive.
Intermittent loading can be accommodated up to 6 500 psi, while the rotating assembly endures brief speed peaks to 4 500 rpm; these limits give designers the allowable reserve for acceleration and pressure spikes. Electronic proportional control starts at 200 mA and reaches full stroke at 600 mA, so the current loop range dictates command resolution for displacement adjustment. The EP4 solenoid operates on 24 V ±20 %, and a coil resistance of 22.7 Ω determines steady-state current and heat generation in the valve driver. Hydraulic connections use 3/4-inch ports conforming to SAE J518, providing standardized flange interfaces for A and B work lines. Together these specifications outline the electrical and hydraulic boundaries that must be respected when integrating the pump into mobile or stationary motion systems.
Technical Specifications
Boost Pressure Nominal
365 psi (25 bar)
Direction Of Rotation
Clockwise (R)
Displacement (vg Max)
56 cm3/rev (3.42 in3)
End Of Control Current
600 mA
Flow At 3600 Rpm (vg Max)
202 L/min (53.4 gpm)
Maximum Pressure
6500 psi (450 bar)
Maximum Speed (intermittent)
4500 rpm
Nominal Pressure
5800 psi (400 bar)
Nominal Speed
3600 rpm
Power At 400 Bar
134 kW (180 hp)
Solenoid Resistance
22.7 Ω
Solenoid Voltage (ep4)
24 V (±20%)
Start Of Control Current
200 mA
Torque At 400 Bar
357 Nm (263 lb-ft)
Working Port A/b
3/4 in (SAE J518)
1620 Old Apex Road
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