Bosch Rexroth | AA4VG56EP4D132L-NSC52F005DP
AA4VG56EP4D1/32L-NSC52F005DP
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The AA4VG56EP4D1/32L-NSC52F005DP axial variable pump is produced by Bosch Rexroth within the AA4VG Variable Pumps series and serves to regulate hydraulic power in closed-loop drive systems. A maximum displacement of 56 cm³/rev enables the unit to move a sizable oil volume with each revolution. When operated at the nominal speed of 3600 rpm and full displacement, it delivers a flow of 202 l/min to support circuits that need steady high throughput. Intermittent speeds up to 4500 rpm provide extra flow during short load peaks. The nominal pressure rating of 400 bar sets the continuous duty limit, while a maximum pressure of 450 bar allows brief overload operation. Power draw reaches 134 kW at 400 bar so the connected prime mover must supply sufficient energy. Correspondingly, the shaft transmits 357 Nm at that pressure, giving the drive train the torque needed to start under load.
An internal boost pump displacement of 11.6 cm³/rev maintains case charge pressure to prevent cavitation. Counter-clockwise rotation matches engines and gearboxes that turn in that direction. The EP4 electro-proportional controller requires a 24 V supply with a ±20 % tolerance, allowing direct connection to common mobile electrical systems. Displacement control begins at 200 mA and reaches its upper limit at 600 mA, defining the current window for swashplate positioning. Reliable actuation demands a pilot pressure at least 20 bar above the case, which stabilizes the control piston. A 1 1/4 in 14-tooth 12/24DP spline transmits input torque and mates with standard SAE shafts. The SAE J744 127-2 (C) mounting flange aligns the housing to C-size bell housings for straightforward installation.
Technical Specifications
Boost Pump Displacement
11.6 cm³/rev
Control Voltage (ep4)
24 V (±20%)
Direction Of Rotation
Counter-Clockwise
Displacement (vg Max)
56 cm³/rev
Drive Shaft Spline
1 1/4 in 14T 12/24DP
End Of Control Current (ep4)
600 mA
Flow At Nnom And Vg Max
202 l/min
Max Speed Intermittent
4500 rpm
Maximum Pressure
450 bar (6500 psi)
Minimum Control Pressure
20 bar above case
Mounting Flange
SAE J744 127-2 (C)
Nominal Pressure
400 bar (5800 psi)
Nominal Speed
3600 rpm
Power At 400 Bar
134 kW
Start Of Control Current (ep4)
200 mA
Torque At 400 Bar
357 Nm
1620 Old Apex Road
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