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Danfoss OMR160 151-0714 Hydraulic Orbital Motor
Overview
The Danfoss OMR160 151-0714 is a medium‑duty orbital hydraulic motor from Danfoss‘s OMR series. Designed as a fixed‑displacement, low‑speed high‑torque (LSHT) motor, it efficiently converts hydraulic energy into powerful and reliable mechanical rotation. Its compact and durable construction makes it a versatile solution for a wide range of industrial and mobile hydraulic systems, where it is engineered to deliver high starting torque, smooth operation across a broad speed range, and exceptional reliability under challenging operating conditions.
Technical Features
Advanced Gerotor Gear Set — The motor uses a proven Gerotor (orbital) gear set design. This roller‑equipped gear set delivers smooth, high‑torque output at low speeds, increases efficiency, and ensures a long operational life.
Spool Valve Distribution — A spool‑type distributor valve is integrated with the output shaft and driven by a cardan shaft. This design ensures precise filling and emptying of motor chambers, minimizes internal losses, and contributes to high volumetric and mechanical efficiency.
Fixed Displacement — With a fixed displacement of 160 cm³ per revolution, the motor‘s output torque is determined by the system pressure, while its speed is directly controlled by the input flow rate. This simple, reliable relationship allows for easy speed regulation by controlling oil flow.
High Pressure Capability — The motor operates with a maximum continuous pressure drop of 75 bar (1,090 psi), an intermittent pressure drop of 100 bar (1,450 psi), and a peak pressure drop of 160 bar (2,320 psi). Its maximum continuous inlet pressure is 175 bar (2,540 psi).
High Torque Output — The OMR160 delivers a maximum continuous torque of 300 Nm (2,660 lbf‑in) and a maximum intermittent torque of 390 Nm (3,450 lbf‑in), making it capable of handling heavy loads while maintaining the compact LSHT form factor.
Robust Construction — The motor is built with a durable cast iron housing, finished in black (RAL 9005), which provides the structural integrity needed for demanding operations.
High Starting Torque — The Gerotor design provides high starting torque, ensuring smooth and reliable operation from a standstill, even under heavy load conditions. This is critical for applications where the motor must overcome high inertia loads.
Compact & Lightweight — The OMR160 features a compact, space‑saving design and weighs approximately 6.73 kg. Its high power density makes it suitable for installation in space‑constrained equipment without sacrificing performance.
High‑Strength Shaft — The motor is equipped with a high‑strength output shaft capable of withstanding heavy loads and shocks during operation. This robust shaft construction contributes to the motor‘s durability and service life.
Advanced Sealing System — The motor incorporates an advanced sealing system with high back‑pressure tolerance. This high back‑pressure capability allows the motor to be used in series or parallel circuit configurations without requiring separate drain lines, simplifying system design and improving reliability.
Bi‑Directional Operation — Designed for reversible operation, the OMR160 is a bi‑directional motor, rotating clockwise or counter‑clockwise by simply reversing the hydraulic flow. This eliminates the need for complex mechanical reversing mechanisms.
Wide Operating Temperature — The motor operates reliably across a temperature range of −20°C to +80°C (−4°F to +176°F), supporting use in both cold outdoor and hot industrial environments.
Fluid Versatility — The motor is compatible with a wide range of hydraulic fluids, including mineral oils, synthetic oils, and biodegradable fluids, making it adaptable to diverse application requirements. It operates effectively in both open‑loop and closed‑loop hydraulic systems.
Standardized Mounting & Porting — The motor features a 2‑bolt A2 mounting flange (SAE A2 standard). The shaft is cylindrical with a spline (1 inch spline), and the main ports are G 1/2 side ports, with a standard drain port.
Core Functionalities
LSHT Performance — The OMR160 is specifically designed for low‑speed, high‑torque (LSHT) operation. Its roller‑equipped Gerotor design provides high torque at low rotational speeds, enabling it to deliver consistent torque output across the operating speed range, from its minimum up to 375 rpm continuous (470 rpm intermittent).
Stepless Speed Control — As a fixed‑displacement motor, its speed is infinitely variable and directly proportional to the hydraulic flow rate. Precise control from the minimum to the maximum speed is achieved with a simple flow control valve, eliminating the need for complex mechanical transmissions.
High Starting Torque & Breakaway Capability — The Gerotor design provides high starting torque, enabling the motor to easily overcome heavy breakaway loads from a standstill. This is critical for applications where the motor must start under full load.
Smooth & Constant Torque — The motor runs smoothly over its entire speed range and maintains a constant torque output, regardless of speed fluctuations, ensuring consistent and reliable performance.
Energy Efficient Operation — High mechanical and volumetric efficiency ensures minimal energy loss, converting a maximum amount of hydraulic energy into useful mechanical power. This reduces heat generation and overall system power consumption.
Bi‑Directional Drive — The motor can change rotational direction instantly by reversing the hydraulic flow, supporting applications that require forward‑reverse cycling without additional mechanical reversing components.
Series & Parallel Circuit Compatibility — The high back‑pressure tolerance of the sealing system allows the motor to be used in both parallel and series setups, providing flexibility for system designers to create optimized hydraulic architectures.
Long Service Life — The combination of a robust cast iron housing, roller‑equipped Gerotor gear set, high‑strength output shaft, and advanced sealing ensures a long service life under demanding conditions, leading to reduced downtime and lower total cost of ownership.
Application Sectors
The Danfoss OMR160 151-0714 is widely used across numerous industries where compactness, high torque, and reliability are essential. The OMR series is particularly well suited for both open‑circuit and closed‑circuit hydraulic systems for work and propel applications. Typical applications include:
| Industry Sector | Typical Applications |
|---|---|
| Agricultural Machinery | Balers, forage harvesters, combine harvesters, spreaders, self‑propelled sprayers, and other agricultural equipment requiring high torque and reliable operation in demanding outdoor conditions. |
| Construction Equipment | Mini excavators, skid steer loaders, backhoe loaders, trenchers, and concrete mixers for powering auxiliary circuits and drive functions. |
| Material Handling & Lifting | Forklifts, pallet stackers, aerial work platforms (scissor and boom lifts), industrial winches, and lifting systems where compactness and high torque are critical. |
| Forestry Equipment | Wood chippers, stump grinders, brush cutters, log splitters, and forestry harvesters, where equipment must operate reliably in rugged outdoor environments with high torque demands. |
| Lawn & Turf Equipment | Commercial mowers, grass cutters, landscaping machinery, and turf maintenance equipment, leveraging the motor‘s compact and lightweight design. |
| Municipal Equipment | Street sweepers, road maintenance machinery, and municipal cleaning vehicles requiring reliable, low‑speed, high‑torque actuation. |
| Industrial & Stationary | Conveyor systems, rotary tables, mixing equipment, injection molding machines, industrial automation, and test rigs. |
| Mobile Hydraulic Systems | Aerial work platforms (scissor lifts, boom lifts), access equipment, and other mobile machinery where space‑saving design is critical. |
| Marine & Offshore | Deck machinery, winches, capstans, and steering gear on small to medium vessels, benefitting from the motor‘s robust construction and corrosion‑resistant features. |
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss / Sauer-Danfoss |
| Series | OMR |
| Model Code | OMR160 151‑0714 |
| Displacement | 160 cm³/rev (160 ccm/rev) |
| Maximum Continuous Speed | 375 rpm |
| Maximum Intermittent Speed | 470 rpm |
| Maximum Continuous Torque | 300 Nm (2,660 lbf‑in) |
| Maximum Intermittent Torque | 390 Nm (3,450 lbf‑in) |
| Maximum Continuous Pressure Drop | 75 bar (1,090 psi) |
| Maximum Intermittent Pressure Drop | 100 bar (1,450 psi) |
| Maximum Peak Pressure Drop | 160 bar (2,320 psi) |
| Maximum Continuous Flow | 60 L/min (15.9 gpm) |
| Maximum Intermittent Flow | 75 L/min (19.8 gpm) |
| Minimum Stable Speed | ~15 rpm (load dependent) |
| Rotation | Bi‑directional (reversible) |
| Shaft Type | Cylindrical with spline (1 inch spline) |
| Flange Type | A2 (2‑bolt SAE A2 standard) |
| Port Style | Side ports |
| Main Port Thread | G 1/2 (BSPP) |
| Drain Port | Standard (G 1/4 BSPP) |
| Housing Material | Cast iron |
| Finish / Color | Black (RAL 9005) |
| Weight | Approx. 6.73 kg |
| Operating Temperature | −20°C to +80°C (−4°F to +176°F) |
| Sealing | High‑pressure shaft seal (HPS) with high back‑pressure tolerance |
| Fluid Compatibility | Mineral oils, synthetic oils, biodegradable fluids |
| Circuit Compatibility | Open‑loop and closed‑loop systems; suitable for series and parallel setups |
| Superseded by | OMRX160 11186658 (enhanced OMR X series) |
Supersession Information
The OMR160 151‑0714 has been superseded by the enhanced Danfoss OMR X 160 (replacement part number 11186658). The OMR X series offers improved performance, including up to 15 % higher torque compared to previous OMR motors, greater bearing capacity for higher radial loads, an improved high‑pressure shaft seal (HPS) with a 225 bar rating, an integrated drain connection as standard, and enhanced painting according to corrosion class C3 (ISO 12944). For new installations or replacements, the OMR X 160 is the recommended current model.
Conclusion
The Danfoss OMR160 151‑0714 is a robust, efficient, and highly versatile medium‑duty orbital hydraulic motor that demonstrates Danfoss‘s leadership in LSHT technology. Its 160 cm³ displacement, 300 Nm continuous torque output, and 375 rpm continuous speed capability make it ideally suited for a wide range of demanding applications.
Its defining features include a roller‑equipped Gerotor gear set with high starting torque, constant torque output across a wide speed range, high pressure capability (175 bar continuous inlet with 75 bar pressure drop), high back‑pressure tolerance (enabling series or parallel circuit use without a drain line), a compact cast iron housing weighing approximately 6.73 kg, bi‑directional rotation, and a standard A2 flange with G 1/2 side ports.
These attributes make the OMR160 an excellent, energy‑efficient solution for a vast array of agricultural machinery, construction equipment, material handling systems, forestry machines, lawn and turf equipment, and industrial automation.
As a proven, reliable choice, the OMR160 provides a balance of performance and longevity suitable for a wide range of challenging hydraulic systems. For new installations requiring maximum performance, the upgraded OMR X 160 (11186658) is now recommended, offering higher torque, improved bearing capacity, and enhanced corrosion protection. Nevertheless, the OMR160 151‑0714 remains a widely referenced and trusted standard for high‑torque, low‑speed hydraulic actuation worldwide.
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