Bosch Rexroth | AA4VG71HD3DT132R-NSF52F021D-S
AA4VG71HD3DT1/32R-NSF52F021D-S
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The AA4VG71HD3DT1/32R-NSF52F021D-S variable pump belongs to the AA4VG Variable Pumps series from Bosch Rexroth. It serves closed-loop hydraulic drives where adjustable flow is required for automation tasks. The unit offers a maximum displacement of 71 cm³ per revolution so the circuit designer can size flow rates for mobile or industrial actuators. A built-in boost pump delivers 19.6 cm³ per revolution to maintain case filling and avoid cavitation. When the shaft turns at the nominal speed of 3300 rpm the pump supplies up to 234 l/min of oil at full displacement. Clockwise rotation matches common engine and motor arrangements, and the 1.3 l case volume provides oil for internal lubrication and heat balance. A rotating group inertia of 0.0097 kg·m² influences start-up torque and dynamic response, while a bare weight of 50 kg supports direct mounting on gearboxes or frames without extra bracing.
For pressure regulation, the pump is rated for 400 bar nominal pressure and can withstand 450 bar for short durations, enabling high power density in compact systems. At 400 bar and full displacement it transmits 452 Nm of torque and 156 kW of mechanical power to the hydraulic circuit. The HD control starts reducing displacement at 6 bar and reaches full destroking at 18 bar, providing automatic standby flow reduction when boost pressure drops. Continuous operation is limited to 3600 rpm, while 4100 rpm is permissible intermittently for transient conditions. These speed limits permit flexible matching to diesel engines or electric motors without overspeed. Together, the listed speed, pressure, and control thresholds define safe operating windows for cylinder or motor drives that rely on precise variable flow from the AA4VG pump.
Technical Specifications
Boost Pump Displacement
19.6 cm³/rev
Case Volume
1.3 l
Direction Of Rotation
Clockwise
Displacement (max)
71 cm³/rev
Flow At Nominal Speed (vg Max)
234 l/min
Hd Control End Pressure
18 bar
Hd Control Start Pressure
6 bar
Max Speed (intermittent)
4100 rpm
Max Speed (limited)
3600 rpm
Maximum Pressure
450 bar
Moment Of Inertia (jtw)
0.0097 kg·m²
Nominal Pressure
400 bar
Nominal Speed
3300 rpm
Power At 400 Bar (nnom, Vg Max)
156 kW
Torque At 400 Bar (vg Max)
452 Nm
Weight (without Through Drive)
50 kg
1620 Old Apex Road
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