AA10VO85DR/52L-VUC62N00

The AA10VO85DR/52L-VUC62N00 pump belongs to the A10VSO Variable Pumps series and is manufactured by Bosch Rexroth for hydraulic automation circuits. It uses pressure control DR to adjust displacement in response to system demand, enabling closed-loop regulation without external controllers. The unit is designed for a nominal pressure of 4000 psi (280 bar), establishing the continuous operating limit of the hydraulic circuit. A peak pressure capability of 5100 psi (350 bar) provides short-term overload capacity during transient events. Counterclockwise rotation defines the correct drive orientation and ensures compatibility with prime movers arranged for left-hand rotation. A splined reduced diameter shaft simplifies torque transfer while permitting a compact coupling arrangement. Side ports arranged under the 62 orientation pattern allow plumbing to run parallel with the housing to save installation space. The pilot port is tapped 7/16-20 UNF-2B, allowing standard hydraulic fittings to connect pilot lines securely. A maximum case drain pressure of 29 psi (2 bar) limits housing backpressure so internal bearings receive sufficient lubrication flow.

The DR pressure regulator can be set as high as 4000 psi (280 bar) to define the maximum delivery pressure permitted by the control spring. The minimum adjustable setting of 725 psi (50 bar) supports low-pressure standby operation when full flow is not required. Control hysteresis does not exceed 45 psi (3 bar), which keeps pressure fluctuations within a narrow band during load changes. Hydraulic fluid temperature must remain below 239 °F (115 °C) to preserve seal integrity and oil viscosity. An inlet absolute pressure of at least 12 psi (0.8 bar) prevents cavitation at the suction port. Pilot oil consumption is limited to 0.8 gpm (3 L/min), reducing heat generation and minimizing auxiliary flow demand. FKM seals resist high temperature and many hydraulic fluids, extending service life in demanding environments. No through-drive option is provided, so the pump cannot mechanically pass power to subsequent pumps in tandem arrangements. These settings work together to maintain system pressure stability across the pump's working range.