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Danfoss OMP50 151‑0610 Hydraulic Orbital Motor
Overview
The Danfoss OMP50 151‑0610 is a compact, light‑duty orbital hydraulic motor from Danfoss’s OMP series-1. Designed for medium‑pressure applications, it offers a balance of efficiency and durability-1. Its gerotor gear set provides relatively high torque at low speeds while maintaining a compact footprint, making it suitable for mobile and industrial systems where space is limited and moderate power is required-1-4. This model is now discontinued and is superseded by the OMP X series (replacement part number 11185771)-4.
Technical Features
Gerotor Gear Set Design – The motor uses a gerotor (orbital) principle. An inner gear ring is fixed to the housing, and pressurised oil drives a rotor that revolves around a centre point, generating torque. This construction delivers smooth, low‑speed, high‑torque output-13.
Compact & Lightweight – The orbital design offers a much smaller overall size compared to other hydraulic motor types with the same torque capacity. The motor is fabricated in an aluminium housing, which keeps weight low and eases installation in tight spaces-13.
Robust Shaft Seals – The motor is built with shaft seals capable of handling high back pressure. In most applications this eliminates the need for a separate drain line, simplifying the hydraulic circuit-1-4.
Bi‑directional Rotation – The motor is a dual‑rotation (reversible) unit, meaning it can operate in both clockwise and counter‑clockwise directions without modification-9. This allows forward and reverse motion with no need to stop when changing direction, increasing operational flexibility-13.
Standard Mounting & Shaft – The motor uses a 2‑bolt SAE A mounting flange (Ø82.55 mm pilot diameter) and a Ø25 mm parallel key shaft (A8 x 7 x 32 mm DIN 6885)-1-4. These standard interfaces simplify adaptation to many types of equipment.
Hydraulic Ports – Main ports are G 1/2 BSPP (ISO 228/1) and the drain port is G 1/4 BSPP (ISO 228/1), providing compatibility with common hydraulic fittings-1-4.
Wide Speed Range & Stepless Regulation – The motor achieves a minimum stable speed as low as 15 rpm, with the ability for stepless speed regulation. This allows precise control over the output speed throughout the entire operating range-13.
Low Rotational Inertia – The low‑inertia rotor makes the motor easy to start under load, which is beneficial in applications that require frequent starting and stopping-13.
Core Functionalities
High Torque at Low Speeds – The orbital design provides relatively high torque even at low speeds, making the motor well suited for tasks that require powerful, slow rotation. The maximum continuous torque is 77 Nm (680 lb‑in)-1-4.
Stepless Speed Regulation – Because output speed is directly proportional to hydraulic flow, controlling a simple flow control valve gives infinitely variable motor speed, in both forward and reverse directions. This stepless control eliminates complex mechanical transmissions-13.
Bi‑directional Operation – The ability to reverse direction without stopping streamlines machine cycles and eliminates the need for separate mechanical reversing devices.
Open‑Loop / Closed‑Loop Compatibility – The motor works in both open and closed hydraulic circuits, and it can be used in series or in parallel with other hydraulic components, providing flexibility for system designers--13.
Low Maintenance & Long Service Life – The robust gerotor gear set, quality seals and aluminium housing are designed to minimise wear. The high‑strength output shaft withstands heavy loads and shocks, reducing the risk of mechanical failure in demanding applications-. Routine inspection and fluid cleanliness (ISO 4406 class 20/18/15) are recommended to maximise life.
Application Sectors
The OMP50 151‑0610 is widely used in industrial and mobile hydraulic systems where compactness, efficiency and moderate power are required-4. Common applications include:
Agricultural machinery – Small tractors, harvesters, seeders, rotary tillers, mowers, sprayers, feed mixers and ground drilling machines-13.
Construction equipment – Road rollers, cement mixers, sweepers, small excavators and skid‑steer loaders (wheel motors, auger drives)-13-4.
Material handling & lifting equipment – Conveyors, winches, pallet stackers and small hoists--4.
Industrial machinery – Machine tools, packaging equipment, industrial mixers and agitators, textile machines, printing presses and commercial washing machines-13-4.
Marine & fishery – Net‑lifting devices and deck machinery on small fishing vessels-13.
Forestry & turf care – Lawn care machinery, small wood chippers, brush cutters and ground‑drilling equipment-13-9.
Mining & light industry – Small mining machinery (conveyor drives), light‑duty industrial equipment and material transfer devices-13.
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss |
| Series | OMP |
| Product Number | 151‑0610 |
| Displacement | 51.7 cm³/rev (3.15 in³/rev)-1 |
| Max continuous speed | 1200 rpm-1 |
| Max continuous torque | 77 Nm (680 lb‑in)-1 |
| Max continuous pressure drop | 125 bar (1810 psi)-1 |
| Max intermittent pressure drop | 150 bar (2180 psi)-1 |
| Max peak pressure drop | 175 bar (2540 psi)-1 |
| Mounting flange | 2‑bolt SAE A (Ø82.55 mm pilot)-1 |
| Shaft | Ø25 mm parallel key (A8 x 7 x 32 mm DIN 6885)-1 |
| Main ports | G 1/2 BSPP (ISO 228/1)-1 |
| Drain port | G 1/4 BSPP (ISO 228/1)-1 |
| Minimum stable speed | 15 rpm-13 |
| Rotation | Bi‑directional (reversible)-9 |
| Weight (approx.) | 3 kg (6.6 lb) (manufacturer’s official data sheet recommended) |
Conclusion
The Danfoss OMP50 151‑0610 is a compact, efficient and reliable orbital hydraulic motor designed for medium‑pressure systems where space is limited and moderate torque at low speeds is required. Its gerotor gear set, bidirectional rotation, wide speed range, low inertia and standard SAE A mounting make it easy to integrate into a broad range of agricultural, construction, material handling and industrial machinery. Although the model has been discontinued (replacement part number 11185771), it remains a well‑understood reference in the OMP series for applications that demand proven, energy‑efficient rotary power in a lightweight aluminium package. Proper fluid maintenance and adherence to operating limits will ensure long service life and consistent performance.
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