Danfoss OMV 630 151B3103 orbital hydraulic motor

Danfoss OMV 630, part number 151B3103, is a fixed-displacement orbital hydraulic motor for low-speed, high-torque drives. The factory lists a geometric displacement of 629.1 cm³/rev. The nominal motor size 630 is a series designation, distinct from the exact geometric displacement.

This article uses a cylindrical keyed shaft: Dia. 50 mm, M12 x 1.75-6H thread in shaft end. Its four-bolt square mounting flange has a 160.0 mm pilot, a 200.0 mm bolt circle and 18.0 mm mounting holes. Shaft-end details and tolerances are shown on the original manufacturer pages in the local technical reference.

The main connections are 1 inch BSP parallel ports, arranged as staggered side ports. The drain connection is 1/4 inch BSP. The motor has Geroler gearing, disc valve with valve drive, NBR - Standard shaft sealing and tapered roller bearings. Factory check-valve provision: Yes.

Select an operating point from the size-specific performance diagram. Continuous, intermittent and peak catalogue limits describe different operating conditions and must not be combined into a single maximum-duty point. Differential pressure is not the same as maximum inlet pressure. Follow the applicable shaft-load, shaft-seal pressure, drain-line and return-pressure conditions.

Representative Danfoss OMV series photograph supplied on this article’s manufacturer page; shaft, ports, mounting and displacement may differ. Use the technical PDF for exact specifications.