A10VSO140DFR1/31R-PPB12KB4

The A10VSO140DFR1/31R-PPB12KB4 variable pump is produced by Bosch Rexroth within the A10VSO Variable Pumps series and supplies adjustable flow for hydraulic automation circuits. Its geometric displacement of 140 cm³ per revolution defines the volume delivered each shaft turn, while a maximum speed of 2100 rpm at less than full displacement lets the pump respond quickly to varying load demands. When set to full displacement and driven at 1800 rpm, the unit provides a flow of 252 L per minute to downstream actuators. Clockwise shaft rotation aligns with standard right-hand drive trains. A suction port sized for SAE J518 2 1/2 in connections accommodates high inlet volumes, and the inlet line must maintain at least 0.8 bar absolute pressure to avoid cavitation. Discharge is routed through a pressure port machined for a SAE J518 1 1/4 in flange so that line sizing matches the expected flow. Return leakage exits through a case drain port threaded 1 1/16-12 UN-2B, simplifying installation of drain hoses back to tank.

The pump sustains system loads up to a maximum pressure of 350 bar, with a nominal working pressure of 280 bar for continuous duty cycles. The pressure cut-off is factory set to 280 bar, enabling automatic displacement reduction when this level is reached. Pilot port X tolerates the same 350 bar rating, allowing external control signals to match system pressure without additional reducing valves. The DFR1 differential pressure of 14 bar governs the regulator spring offset so that flow adapts to demand while keeping margin above load pressure. When running at full displacement, the drive speed should not exceed 1800 rpm, protecting internal components from overspeed stress. The housing cavity is limited to a case pressure of 2 bar absolute, ensuring shaft seals remain within their design window. These combined parameters coordinate pressure control and mechanical limits so the pump integrates safely into closed-loop hydraulic machinery.