Bosch Rexroth | AA4VG71HD3DMT132L-NSF52F041D-S
AA4VG71HD3DMT1/32L-NSF52F041D-S
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The AA4VG71HD3DMT1/32L-NSF52F041D-S pump is produced by Bosch Rexroth in the AA4VG Variable Pumps series for closed-circuit hydraulic drives. It offers a maximum displacement of 71 cm³ per revolution so the circuit can move a large oil volume at full stroke. At a nominal speed of 3300 rpm with zero differential pressure, the unit starts cleanly under light load. Flow reaches 234 l/min at that speed, supplying sufficient fluid to propel hydrostatic transmissions. A minimum operating speed of 500 rpm lets the system modulate output without losing lubrication. System pressure can climb to 450 bar, giving high power density for compact machines, while a nominal pressure of 400 bar keeps components inside their fatigue limit. Under that 400 bar load the shaft delivers 452 Nm of torque, converting pressure energy into mechanical drive, and the same condition supports a power transfer of 156 kW for demanding propel or winch duties.
For auxiliary charging the built-in boost stage has a displacement of 19.6 cm³ per revolution to supply makeup flow that maintains circuit volume. A boost nominal pressure of 25 bar keeps case flushing steady, and this stage can rise to 40 bar to secure inlet conditions during transients. The input shaft tolerates 602 Nm so the pump can absorb high engine torque without mechanical overload. A through-drive rating of 660 Nm allows a second pump to be mounted in tandem, powering additional circuits from the same prime mover. Intermittent operation up to 4100 rpm handles short acceleration bursts, whereas continuous service is limited to 3600 rpm to control bearing stress and oil temperature. The control port must receive 20 bar above case pressure to move the swashplate reliably, ensuring consistent displacement adjustment across the working range.
Technical Specifications
Boost Maximum Pressure
40 bar
Boost Nominal Pressure
25 bar
Boost Pump Displacement
19.6 cm3/rev
Displacement (vg Max)
71 cm3/rev
Flow At Nominal Speed
234 l/min
Max Input Torque (s Shaft)
602 Nm
Max Speed (intermittent)
4100 rpm
Max Speed (limited)
3600 rpm
Max Through-drive Torque
660 Nm
Maximum Pressure
450 bar
Minimum Speed
500 rpm
Nominal Pressure
400 bar
Nominal Speed (Δp=0)
3300 rpm
Power At 400 Bar
156 kW
Required Control Pressure (hd)
20 bar above case
Torque At 400 Bar
452 Nm
1620 Old Apex Road
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