AA4VG180EP4DM1/32L-NXD52F001KH-S

The AA4VG180EP4DM1/32L-NXD52F001KH-S is a variable displacement pump produced by Bosch Rexroth for the AA4VG Variable Pumps series. It supplies hydraulic power to mobile and industrial automation circuits where pressure and flow must be adjusted on demand. The geometric displacement is 180 cm³ per revolution for each pumping section, establishing the base volume per shaft rotation. A supplementary boost pump provides 39.8 cm³ per revolution, ensuring inlet filling under low suction conditions. At 2500 rpm and rated displacement the main stage delivers 450 L/min to actuators, supporting high dynamic loads. The maximum steady speed at full displacement is 2500 rpm so the pump can maintain rated output without overspeed. A minimum operating speed of 500 rpm allows controlled low-flow operation during machine idle cycles. Nominal pressure capability is 400 bar, matching common closed-loop hydrostatic drives. Torque demand at 100 bar is 286 Nm, a value used to size the prime mover. The EP4 electronic control requires a 24 VDC supply so the displacement can be modulated by standard mobile controllers.

The pump accommodates transient duty beyond its nominal limits. An intermittent speed ceiling of 3000 rpm permits short bursts during acceleration, while a limited continuous speed of 2900 rpm applies when displacement is reduced to protect bearings. Maximum system pressure is 450 bar, providing a safety margin for braking events and thermal growth. Shaft acceleration can reach 11000 rad/s², which suits rapid direction changes in closed-loop drives. The rotating group has a moment of inertia of 0.0444 kg·m², allowing fast response with moderate motor torque. Output torque rises to 1146 Nm at 400 bar, enabling high tractive effort in propel functions. Internal case volume of 3.1 L holds leakage oil that lubricates the rotating assembly and must be routed back to tank for cooling.