83012903

The 83012903 pump from Danfoss belongs to the Open Circuit Piston Pumps series and serves as an open-circuit axial piston unit for hydraulic automation where variable flow and stable outlet pressure are required. Its 90 cc per revolution displacement establishes the volume delivered each shaft turn, allowing system designers to size flow rates accurately. A pressure-compensated control adjusts swash-plate angle automatically to keep delivery constant under load changes, and the compensator is factory set to 210 bar so downstream actuators see a fixed pressure ceiling. Counter-clockwise rotation matches engines or electric motors that turn in that direction, preventing mis-alignment with drive trains. The pump draws oil through a 2 in inlet port that minimizes suction losses and discharges through a 1 in outlet port sized for the rated flow. All housing ports use SAE O-ring connections to simplify leak-free tube installation and maintenance.

For mounting, the unit carries a SAE-C four-bolt front flange that positions the shaft precisely on power take-off pads, while an auxiliary SAE-B 13-tooth flange is provided for tandem accessories such as charge pumps. The radial endcap supports internal galleries without adding length, which helps keep the package compact in crowded skid frames. Flow dynamics are tuned with a standard gain orifice that balances control response; no choke orifice is installed, so the compensator reacts without additional damping. Continuous operation is permitted up to 260 bar, giving headroom above the compensator setting for transient demands. A single Viton shaft seal resists high-temperature fluid and prevents external leakage at the drive interface, and the 14-tooth 12⁄24 pitch spline transmits torque while aligning the shaft with mating couplings. Together these features allow reliable operation in mobile and industrial circuits that rely on open-circuit pumps for consistent hydraulic power.