AA10VSO28DFLR/31R-VPA12N00

The AA10VSO28DFLR/31R-VPA12N00 variable pump is part of the A10VSO Variable Pumps series produced by Bosch Rexroth for closed-loop hydraulic automation. It uses the DFLR control, so the swashplate shifts in response to load pressure and flow demand without external valves. A geometric displacement of 28 cm³ per revolution defines the volume delivered as the shaft turns. When driven at nominal speed the unit can supply up to 84 l/min, meeting mid-range flow requirements for mobile equipment. A nominal pressure rating of 280 bar supports continuous duty, while a 350 bar limit allows short-term peak loads. Clockwise rotation matches common engine outputs, simplifying direct coupling. The pump reaches 3000 rpm, extending its use to high-speed power units, and its 39 kW maximum power permits compact installation in restricted spaces. A rotor moment of inertia of 0.0017 kg·m² keeps acceleration times low, which benefits systems that cycle frequently.

Internal and external interfaces are designed to ease installation and protect service life. A 0.7 l case volume stores leakage oil and promotes bearing lubrication during transient conditions. Housing backpressure must remain below 2 bar, so the case drain specification prevents seal damage. At 4100 psi the shaft can transmit 125 Nm of torque, enabling full displacement operation without slipping. The suction port is a 1 1/4 in ISO 6162-1 flange that limits inlet velocity and reduces cavitation risk, while the working port is a 3/4 in ISO 6162-1 flange sized for the pressure line. Pilot control connects through a 7/16-20 UNF thread, providing a compact path for remote pressure signals to the control mechanism. FKM sealing material resists high temperature and aggressive hydraulic fluids, maintaining leak-tight joints throughout the pump’s pressure range. Together these features let the unit integrate cleanly into industrial or mobile circuits where dependable variable flow is required.