Bosch Rexroth | AA4VG125EP4D132R-NSF52F691D-HAA4VG125EP4D132R-NSF52F691D-H
AA4VG125EP4D1/32R-NSF52F691D-H+AA4VG125EP4D1/32R-NSF52F691D-H
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The AA4VG125EP4D1/32R-NSF52F691D-H+AA4VG125EP4D1/32R-NSF52F691D-H variable pump belongs to the AA4VG Variable Pumps series from Bosch Rexroth and is intended for closed-loop hydrostatic transmissions in hydraulic automation. It delivers a geometric displacement of 125 cm³/rev, establishing the volume moved per shaft revolution. At a differential pressure of 400 bar it produces 796 Nm of torque and absorbs 238 kW, enabling compact yet powerful systems. With Δp at zero and the swashplate at maximum angle, the rotating group reaches a nominal speed of 2850 rpm and supplies 356 l/min to downstream actuators. Continuous service is permissible at a nominal pressure of 400 bar, while brief overloads up to 450 bar are tolerated. Cavitation is avoided when inlet pressure remains above 0.8 bar absolute, safeguarding internal components during high flow operation.
The integrated boost pump displaces 28.3 cm³/rev and maintains a nominal charge pressure of 25 bar to keep the main circuit filled during transients. Electronic displacement control operates from a 24 V supply that may vary by ±20 percent, and the proportional solenoid current is limited to 0.77 A for compatibility with standard controllers. Intermittent duty permits speeds up to 3450 rpm, giving headroom for rapid acceleration cycles. A through-drive interface is provided via an SAE J744 152-2/4 (D) flange coupled to a 1 3/4-inch 13-tooth 8/16DP spline, facilitating tandem pump arrangements. This connection can transmit as much as 1110 Nm, ensuring secondary units receive full mechanical power without additional gearing.
Technical Specifications
Boost Pump Displacement
28.3 cm3/rev
Boost Pump Nominal Pressure
25 bar
Control Current Limit (ep4)
0.77 A
Control Supply Voltage (ep4)
24 V (±20%)
Flow At Nominal Speed
356 l/min
Geometric Displacement
125 cm3/rev
Maximum Pressure
450 bar
Nominal Pressure
400 bar
Nominal Speed (vgmax, Δp=0)
2850 rpm
Power At Δp=400 Bar
238 kW
Speed Intermittent Max
3450 rpm
Suction Pressure Min (cont)
0.8 bar abs
Through-drive Flange
SAE J744 152-2/4 (D)
Through-drive Spline
1 3/4 in 13T 8/16DP
Through-drive Torque Max
1110 Nm
Torque At Δp=400 Bar
796 Nm
1620 Old Apex Road
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