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Danfoss OMR200 151-0245 Hydraulic Orbital Motor
Overview
The Danfoss OMR200 151-0245 is a fixed-displacement, medium-duty orbital hydraulic motor from Danfoss‘s OMR series. Designed for medium to heavy-duty applications, it efficiently converts hydraulic energy into reliable and powerful mechanical rotation. Its compact and robust construction makes it a versatile solution for a wide range of industrial and mobile hydraulic systems, offering high starting torque, smooth operation across a broad speed range, and exceptional reliability under challenging conditions. Weighing 8.0 kg and built with a cast iron housing, this motor is well-suited for space-constrained machinery where high torque density is required.
Technical Features
Proven Orbital Gerotor Design – The motor uses a durable Gerotor (orbital) gear set, delivering smooth, high-torque output at low speeds. This roller-equipped design increases efficiency and ensures a long operational life.
Fixed Displacement – With a fixed displacement of 199.8 cm³ (12.23 in³), 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 Torque Capability – The OMR200 delivers a maximum continuous torque of 300 Nm (2,660 lbf-in) and a maximum intermittent torque of 390 Nm (3,450 lbf-in). Its peak torque capability reaches 560 Nm, making it suitable for applications requiring high breakaway torque and load handling at low speeds.
Pressure Ratings – 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). The maximum continuous inlet pressure is 175 bar, with intermittent and peak ratings of 200 bar and 225 bar respectively. A rated pressure of 120 bar (12 MPa) is also specified for certain configurations.
Flow & Speed Range – The motor operates with a maximum continuous flow of 60 L/min (15.9 gpm) and an intermittent flow of 75 L/min (19.8 gpm). It has a maximum continuous speed of 300 rpm and a maximum intermittent speed of 375 rpm. The minimum stable speed is as low as 15 rpm, allowing precise control for positioning tasks.
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.
Advanced Sealing System – The motor features an advanced sealing system with high back pressure tolerance, which helps improve the life and reliability of the motor. This high back-pressure capability allows the motor to be used in series or parallel circuit configurations without requiring separate drain lines.
Robust Construction – Built with a durable cast iron housing finished in black (RAL 9005), the motor provides the structural integrity needed for demanding operations. Its robust design ensures durability and reliability in tough environments.
Compact Size & Lightweight – The OMR200 measures approximately 300 mm in length, 160 mm in width, and 160 mm in height, and weighs 8.0 kg (17.6 lbs). This compact, space-saving design makes it suitable for installation in equipment with limited space without sacrificing performance.
Standardized Mounting & Porting – The motor features an A2 mounting flange (SAE A2 standard). It is equipped with a 32 mm diameter cylindrical shaft (with a parallel key A8 × 7 × 32 mm DIN 6885), side ports, and standard G 1/2 BSPP main ports with a standard drain port. The flange mounting type simplifies installation and ensures compatibility with a wide range of hydraulic components.
Corrosion Resistance – The cast iron material and black finish provide excellent corrosion resistance, making the motor suitable for use in harsh environments where exposure to moisture, dust, and other contaminants is a concern.
Bi-Directional Operation – Designed for reversible operation, the OMR200 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, 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. It operates effectively in both open-loop and closed-loop hydraulic systems.
Efficiency – The motor can provide high-efficiency rotational force and torque output under high pressure, making it suitable for applications that require high-efficiency conversion. It is designed to work for long periods under medium pressure.
Core Functionalities
Low-Speed, High-Torque (LSHT) Performance – The OMR200 is specifically designed for LSHT operation. Its Gerotor design provides high torque at low rotational speeds, enabling it to deliver consistent torque output across the operating speed range, from its minimum stable speed (15 rpm) up to 300 rpm continuous (375 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 motor‘s orbital design provides high starting torque, enabling it 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. The roller-equipped Gerotor gear set contributes to smooth running.
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. It can be used in series or parallel in the hydraulic system.
Easy Installation – The orbital motor is easy to install and arrange, with low investment costs. The flange mounting type and standardized porting simplify integration into new or existing hydraulic systems.
Good Low-Speed Performance – The structure of the orbital motor is relatively simple, with good low-speed performance and strong short-term overload capacity. This makes it suitable for applications requiring precise motion control at low speeds.
Long Service Life – The combination of a robust cast iron housing, roller-equipped Gerotor gear set, high-strength output shaft, and advanced sealing system ensures a long service life under demanding conditions, leading to reduced downtime and lower total cost of ownership.
Application Sectors
The Danfoss OMR200 151-0245 is widely used across numerous industries where high torque, reliability, compactness, and low-speed operation are essential. Application fields include construction machinery, forestry machinery, agricultural machinery, lawn care machinery, material handling machinery, and special machinery. Typical applications include:
| Industry Sector | Typical Applications |
|---|---|
| Agricultural Machinery | Balers, forage harvesters, combine harvesters, spreaders, self-propelled sprayers, planting equipment, and other agricultural equipment requiring high torque and reliable operation in demanding outdoor conditions. The OMR200 is widely used in agricultural machinery for applications requiring high torque and reliability. |
| Construction Equipment | Mini excavators, skid steer loaders, backhoe loaders, trenchers, concrete mixers, and small compactors for powering auxiliary circuits and drive functions. The motor is suitable for heavy-duty construction machinery. |
| Material Handling & Lifting Equipment | Forklifts, pallet stackers, aerial work platforms (scissor and boom lifts), industrial winches, and lifting systems where compactness and high torque are critical. The OMR200 is ideal for forklifts and other lifting equipment. It is particularly suited for forklifts, aerial work platforms, skid steer loaders, and trenchers due to its compact and lightweight design. |
| 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. The motor is used in forestry machinery for heavy-duty operations. |
| Lawn & Turf Equipment | Commercial mowers, grass cutters, landscaping machinery, turf maintenance equipment, and greens mowers, leveraging the motor's compact and lightweight design. The motor is suitable for lawn and turf equipment in landscaping and maintenance applications. |
| Municipal Equipment | Street sweepers, road maintenance machinery, and municipal cleaning vehicles requiring reliable, low-speed, high-torque actuation. |
| Industrial & Stationary Equipment | Conveyor systems, rotary tables, mixing equipment, injection molding machines, industrial automation, and test rigs requiring consistent, high-torque rotary power. The motor is suitable for applications requiring low-speed and high-torque output. |
| Special Machinery | Custom industrial machinery and specialized equipment requiring high torque density, compact packaging, and reliable operation. |
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss / Sauer-Danfoss |
| Series | OMR |
| Model Code | OMR200 151-0245 |
| Displacement | 199.8 cm³ (12.23 in³) |
| Maximum Continuous Speed | 300 rpm |
| Maximum Intermittent Speed | 375 rpm |
| Minimum Stable Speed | 15 rpm (load dependent) |
| Maximum Continuous Torque | 300 Nm (2,660 lbf-in) |
| Maximum Intermittent Torque | 390 Nm (3,450 lbf-in) |
| Maximum Peak Torque | 560 Nm |
| 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 Inlet Pressure | 175 bar |
| Maximum Intermittent Inlet Pressure | 200 bar |
| Maximum Peak Inlet Pressure | 225 bar |
| Rated Pressure | 120 bar (12 MPa) |
| Maximum Continuous Flow | 60 L/min (15.9 gpm) |
| Maximum Intermittent Flow | 75 L/min (19.8 gpm) |
| Maximum Continuous Output Power | 8.0 kW |
| Maximum Intermittent Output Power | 10.0 kW |
| Rotation | Bi-directional (reversible) |
| Shaft Type | Cylindrical, 32 mm diameter |
| Shaft Key | A8 × 7 × 32 mm (DIN 6885) |
| Flange Type | A2 (SAE A2 standard) |
| Port Style | Side port |
| Main Port Thread | G 1/2 BSPP |
| Drain Port | Standard |
| Housing Material | Cast iron |
| Color | Black (RAL 9005) |
| Weight | 8.0 kg (17.6 lbs) |
| Dimensions (L × W × H) | 300 mm × 160 mm × 160 mm (approx.) |
| Operating Temperature | -20°C to +80°C |
| Fluid Compatibility | Mineral oils, synthetic oils, biodegradable fluids |
| Circuit Compatibility | Open-loop and closed-loop systems; suitable for series and parallel setups |
| Status | Superseded by OMR X 200 |
Supersession Information
The OMR200 151-0245 has been superseded by the enhanced Danfoss OMR X 200 (replacement part number to be confirmed). The OMR X series offers higher performance, including torque increase of up to 15 % compared with current OMP/OMR motors, greater bearing capacity for higher radial loads in systems, and an improved high-pressure shaft seal (HPS) with higher pressure rating. For new installations or replacements requiring maximum performance, the OMR X 200 is the recommended current model.
Conclusion
The Danfoss OMR200 151-0245 is a robust, efficient, and highly versatile medium-duty orbital hydraulic motor that demonstrates Danfoss‘s leadership in LSHT technology. Its 199.8 cm³ displacement, 300 Nm continuous torque output (560 Nm peak), 300 rpm continuous speed capability, and 15 rpm minimum stable speed make it ideally suited for a wide range of demanding applications.
Its defining features include a roller-equipped Gerotor gear set providing high starting torque and constant torque output across a wide speed range, high pressure capability (175 bar continuous inlet with 75 bar pressure drop, 225 bar peak), high back-pressure tolerance enabling series or parallel circuit use without a separate drain line, a robust cast iron housing weighing 8.0 kg, bi-directional rotation, and a standard A2 flange with 32 mm cylindrical shaft and G 1/2 side ports.
These attributes make the OMR200 an excellent, energy-efficient solution for agricultural machinery, construction equipment, material handling systems, forestry machines, lawn and turf equipment, municipal applications, and industrial automation. As a proven, reliable choice, the OMR200 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 200 is recommended, offering higher torque and improved bearing capacity.
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