Bosch Rexroth | AA4VG40HWDL132R-NSC53F025D-S
AA4VG40HWDL1/32R-NSC53F025D-S
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The AA4VG40HWDL1/32R-NSC53F025D-S variable pump is produced by Bosch Rexroth as part of the AA4VG Variable Pumps series and is applied in closed-circuit hydraulic automation where precise pressure and flow are required. Its maximum displacement is 40 cm³ per revolution, and a nominal speed of 4000 rpm helps maintain efficient delivery. At that speed and full displacement the unit supplies 160 l/min of fluid, while a nominal pressure of 400 bar allows it to generate 107 kW of hydraulic power and 255 Nm of drive shaft torque. A suction port absolute pressure limit of 5 bar mitigates cavitation risk, and the control circuit can accept up to 40 bar to operate the swashplate mechanism. Internal lubrication is protected by a continuous case differential pressure of 2 bar, keeping leakage within safe limits.
The pump tolerates peak working conditions with a maximum pressure of 450 bar and intermittent speeds up to 5000 rpm, though continuous operation should remain below the 4200 rpm limit. Dynamic duty cycles are supported by an allowable angular acceleration of 30000 rad/s² so the rotating group can follow rapid engine speed changes. An integrated boost pump adds 8.6 cm³ of displacement to keep the main inlet charged, and a 1.1 l case volume stores return oil for bearing lubrication. The housing provides a rotary stiffness of 69 kNm/rad, ensuring stable torque transmission under load variations. These capabilities enable dependable performance in hydrostatic transmissions and other variable-speed hydraulic circuits.
Technical Specifications
Boost Pump Displacement
8.6 cm³ (0.52 in³)
Case Volume
1.1 l (0.29 gal)
Continuous Case Δp (port T)
2 bar (30 psi)
Displacement (vg Max)
40 cm³ (2.44 in³)
Flow @ Nnom, Vg Max
160 l/min (42.3 gpm)
Max Angular Acceleration
30000 rad/s²
Max Control Pressure (ps)
40 bar (580 psi)
Max Speed (intermittent)
5000 rpm
Max Speed (limited)
4200 rpm
Maximum Pressure
450 bar (6500 psi)
Nominal Pressure
400 bar (5800 psi)
Nominal Speed (nnom)
4000 rpm
Power @ 400 Bar
107 kW (143 hp)
Rotary Stiffness (s)
69 kNm/rad
Suction Port Pressure Max (abs)
5 bar (75 psi)
Torque @ 400 Bar
255 Nm (188 lb-ft)
1620 Old Apex Road
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