Bosch Rexroth | AA4VG125EP3D132L-NSF52F001DP-S
AA4VG125EP3D1/32L-NSF52F001DP-S
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The AA4VG125EP3D1/32L-NSF52F001DP-S is a variable pump manufactured by Bosch Rexroth for the AA4VG Variable Pumps series. It supplies hydraulic flow for closed-loop transmissions in automated drive systems. The pump displaces 125 cm³ per revolution, and at the rated speed of 2850 rpm it delivers 356 L/min to downstream actuators. Continuous operation is supported at a nominal pressure of 400 bar, while a maximum of 450 bar covers brief overloads. Driving torque reaches 796 Nm at 400 bar, information required when pairing the pump with an engine or electric motor. Power transfer occurs through a splined shaft that follows ANSI B92.1a, and rotation is counter-clockwise. A SAE J744 2 + 4-hole mounting flange aligns the housing with standard bell-housings, and an integrated boost pump maintains charge pressure to prevent cavitation during rapid displacement changes.
The EP3 electro-proportional controller uses a 12 V supply that can vary by ±20 percent, matching typical mobile electrical buses. Displacement begins to change at 400 mA and reaches the end stop at 1200 mA, enabling remote flow modulation through simple current commands. Intermittent speed can rise to 3450 rpm, which broadens the usable operating envelope for acceleration or braking cycles. NBR sealing with an FKM shaft seal contains high-pressure fluid and resists common hydraulic oils. Working ports A and B are arranged on both the top and bottom faces, with the S case-drain port on the bottom, so hoses can be routed in line with the chosen installation orientation. These characteristics allow the pump to integrate into hydrostatic drives where electronic control currents govern displacement and high rotational speeds occur without compromising reliability.
Technical Specifications
Boost Pump
Integrated
Control Voltage (ep3)
12 V (±20%)
Direction Of Rotation
Counter-Clockwise
Displacement Per Revolution
125 cm³/rev
Drive Shaft Type
Splined ANSI B92.1a (Single Pump)
End Of Control Current (ep3)
1200 mA
Flow At Rated Speed (vg Max)
356 L/min
Max Speed (intermittent)
3450 rpm
Maximum Pressure
450 bar
Mounting Flange
SAE J744 2+4-Hole
Nominal Pressure
400 bar
Rated Speed
2850 rpm
Sealing Material
NBR (Shaft Seal FKM)
Start Of Control Current (ep3)
400 mA
Torque At 400 Bar
796 Nm
Working Port Configuration
A/B Top & Bottom; S Bottom
1620 Old Apex Road
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