Danfoss OMP 25 151-0640 orbital hydraulic motor

Danfoss OMP 25, part number 151-0640, is a fixed-displacement orbital hydraulic motor for low-speed, high-torque drives. Its geometric displacement is 25 cm³/rev; the nominal size 25 is a size designation rather than a substitute for the exact displacement.

The execution has a 25 mm cylindrical keyed output shaft, an A2 two-hole oval mounting flange with 82.5 mm pilot and 106.4 mm bolt circle. Main connections are 1/2 inch BSP parallel ports, with a 1/4 inch BSP drain connection. The A2 configuration uses a high-pressure shaft seal and does not include check valves.

The manufacturer table gives separate continuous limits of 1600 rpm, 33 N·m torque, 100 bar differential pressure, 40 l/min oil flow and 4.5 kW output for the relevant size and shaft group. These maxima are not a single simultaneous operating point. Differential pressure is not an inlet-pressure rating. Use the original performance diagram, shaft-load limits and shaft-seal pressure conditions when selecting the operating point.

Intermittent table values apply for at most 10% of each minute; peak values, where stated, apply for at most 1% of each minute. The performance diagrams specify their oil viscosity, temperature and return-pressure test conditions. Drain-line arrangement and back pressure must follow the applicable manufacturer pages.

This is a discontinued Danfoss factory article documented for identification and maintenance of installed equipment. The retained 2018 catalogue is an archive reference; successor motors and their specifications are separate products. The local technical reference combines the original ordering table, relevant size data, performance diagram, shaft and port details, and applicable mounting drawing. Representative manufacturer dimensional drawing; use the complete PDF for dimensions.