Bosch Rexroth | AA4VG125EP4D132L-NSF52F001DP
AA4VG125EP4D1/32L-NSF52F001DP
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The AA4VG125EP4D1/32L-NSF52F001DP variable pump belongs to the AA4VG Variable Pumps series and is produced by Bosch Rexroth for hydraulic automation systems that need adjustable flow. It features a displacement of 125 cm3/rev, so flow changes linearly with shaft speed. At the nominal speed of 2850 rpm and maximum displacement, the unit supplies 356 l/min to the circuit. Continuous operation is rated at 400 bar, and the drive must transmit 796 Nm of torque at this pressure. Reliable engagement is possible from a minimum speed of 500 rpm, which supports low-idle functions. The rotating assembly is set for counter-clockwise rotation, matching left-hand power take-off drives found on many mobile machines.
The housing tolerates pressure peaks up to 450 bar to protect against transient overloads. During normal service the internal boost stage maintains 25 bar and can rise to 40 bar when higher charge pressure is required. That boost gear set displaces 28.3 cm3/rev to keep the case filled and purge air. Electronic control is handled by an EP4 solenoid supplied with 24 V within a ±20 % range; modulation starts at 200 mA and reaches full response at 600 mA. Stable swashplate actuation needs a minimum control pressure of 20 bar above case level, and inlet conditions must remain above 0.8 bar absolute to prevent cavitation.
Technical Specifications
Boost Pressure Max
40 bar
Boost Pressure Nominal
25 bar
Boost Pump Displacement
28.3 cm3/rev
Control Voltage (ep4)
24 V (±20%)
Direction Of Rotation
Counter-clockwise (L)
Displacement
125 cm3/rev
Flow At Nominal Speed (vg Max)
356 l/min
Maximum Pressure
450 bar
Min Control Pressure (ep)
20 bar (above case)
Minimum Speed
500 rpm
Nominal Pressure
400 bar
Nominal Speed
2850 rpm
Solenoid Current End (ep4)
600 mA
Solenoid Current Start (ep4)
200 mA
Suction Pressure Min (continuous)
0.8 bar abs
Torque At 400 Bar
796 Nm
1620 Old Apex Road
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