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Danfoss OMP400 151-0618 Hydraulic Orbital Motor
Overview
The Danfoss OMP400 151-0618 is a large-displacement, high-torque hydraulic orbital motor from Danfoss’s proven OMP series. It efficiently converts hydraulic energy into reliable mechanical rotational power for a wide range of medium to heavy-duty industrial and mobile applications. As the largest displacement variant in the OMP family (400 cm³/rev), this motor delivers substantial torque output for demanding tasks while maintaining a compact and robust form factor. The OMP series is recognized for its compact volume, economical design, shaft distribution flow architecture, and Gerotor gear set construction, providing high power output with low weight.
Technical Features
Gerotor (Orbital) Gear Set Design – The motor utilizes a proven Gerotor (orbital) gear set design featuring shaft distribution flow. This architecture delivers smooth, high-torque output at low rotational speeds. The Gerotor design is simple yet highly durable, ensuring reliable long-term performance even under heavy load cycles.
Large Displacement – The OMP400 has a displacement of 400 cm³ per revolution (24.4 in³/rev). This places it at the maximum displacement end of the OMP series, which covers displacements from 8 cm³/rev to 400 cm³/rev. The large displacement provides substantial fluid volume per revolution for high torque output without requiring additional gear reduction.
Low-Speed, High-Torque (LSHT) Characteristics – The OMP400 is specifically designed for LSHT applications, delivering high torque at relatively low rotational speeds. The maximum continuous speed is 195 rpm, with an intermittent maximum speed of 245 rpm. The speed range typically spans from 155 to 190 rpm, making it ideal for heavy-duty applications that require powerful rotation but not high speed.
Pressure & Torque 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). It delivers a maximum continuous torque of 300 Nm (2,660 lbf-in) and a maximum intermittent torque of 390 Nm (3,450 lbf-in). The maximum continuous flow rate is 60 L/min (15.9 gpm), with an intermittent flow of 75 L/min (19.8 gpm). The maximum continuous inlet pressure is 175 bar (2,540 psi), with intermittent and peak ratings of 200 bar and 225 bar respectively. Minimum starting torque at maximum pressure drop is 280 Nm (continuous) and 370 Nm (intermittent).
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 break away high inertial loads.
Bi-Directional (Reversible) Rotation – The motor is designed for true bi-directional operation, rotating in both clockwise and counter-clockwise directions by simply reversing the hydraulic flow. This eliminates the need for complex mechanical reversing mechanisms and provides flexible system design.
Advanced Axial Seal Design – The motor features an advanced axial seal design with high back pressure tolerance, which improves 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 in many applications.
High Efficiency – The motor utilizes advanced hydraulic technology to achieve high volumetric and mechanical efficiencies. The OMP series delivers high efficiency across its operating range, reducing energy consumption and operating costs while minimizing environmental impact.
Robust Cast Iron Construction – The motor is built from durable cast iron (RAL 9005 black finish) weighing approximately 6.73 kg. This robust construction provides the structural integrity needed for heavy-duty operations and ensures long service life even under harsh operating conditions.
Standardized Mounting & Shaft Configuration – The motor features a 2-bolt A2 mounting flange (106.1 mm PCD, SAE A2 standard). The shaft is cylindrical with 25 mm diameter, featuring an A8 × 7 × 32 mm keyway (DIN 6885). This standardized interface ensures easy integration with a wide range of equipment and replacement compatibility.
Porting & Connections – The motor uses side ports for simplified plumbing integration. The main ports are G 1/2 (BSPP), and the drain port is G 1/4 (BSPP). This configuration provides compatibility with common hydraulic fittings.
High-Strength Output Shaft – The motor incorporates a high-strength output shaft capable of withstanding heavy loads and shocks during operation. This robust shaft construction contributes to the motor’s durability in demanding applications.
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. It operates effectively in both open-loop and closed-loop hydraulic systems.
Smooth & Precise Operation – The OMP400 is known for its smooth and precise operation, providing reliable speed control that allows for accurate positioning and synchronization in hydraulic systems. This level of control is crucial in applications such as conveyors, winches, and rotating machinery.
Core Functionalities
LSHT (Low-Speed, High-Torque) Performance – The motor’s Gerotor design delivers high torque at low rotational speeds, eliminating the need for additional gear reduction in many applications. The torque output remains consistent across the operating speed range.
Stepless Speed Regulation – Since output speed is directly proportional to hydraulic flow, controlling a simple flow control valve provides infinitely variable motor speed in both forward and reverse directions. This eliminates the need for complex mechanical transmissions and provides precise control over actuator motion.
Constant Torque Across Speed Range – The motor maintains consistent torque output regardless of speed, ensuring reliable performance for applications that require varying speeds while maintaining constant power delivery.
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.
Reversible Drive Capability – The bi-directional design allows the motor to change rotational direction instantly by reversing the flow, supporting applications that require forward-reverse cycling without additional mechanical reversing components.
Energy-Efficient Power Conversion – The combination of 400 cm³ displacement and high torque output at moderate pressure levels provides an excellent torque-to-pressure ratio, maximizing the hydraulic power generated per unit of fluid flow. High mechanical and volumetric efficiency minimizes energy losses and reduces system heat generation.
Low Maintenance & Long Service Life – The robust Gerotor gear set, cast iron construction, quality seals, and advanced axial seal design minimize wear and extend service intervals. The simple yet durable design ensures long-term operational stability with minimal maintenance requirements.
High Back Pressure Tolerance – The advanced axial seal design provides high back pressure tolerance, allowing the motor to be used in series or parallel circuit configurations without requiring separate drain lines, simplifying system design and reducing component count.
Reliable Seal Integrity – The motor is equipped with a reliable shaft seal system that prevents leakage and ensures proper lubrication, further enhancing its longevity and reliability in demanding applications.
Application Sectors
The Danfoss OMP400 151-0618 is designed for a wide range of medium to heavy-duty industrial and mobile applications where high torque, low speed, smooth operation, and robust durability are required. As the largest displacement variant in the OMP series, this motor is particularly well suited for high-load applications that demand substantial torque output without high rotational speeds. The OMP series motors are ideal for closed and open loop hydraulic circuits for work and propel systems across numerous industries.
Agriculture & Turf Care – The OMP400 is widely used in agricultural machinery where its ability to deliver high torque at low speeds and withstand demanding outdoor conditions is essential. Its robust cast iron construction and high starting torque make it ideal for heavy agricultural operations.
| Equipment | Typical Function |
|---|---|
| Round Balers / Large Balers | Driving bale chamber mechanisms, compression systems, and net wrapping systems for high-density bale production |
| Forage Harvesters | Powering cutting and chopping mechanisms, feed rollers, and spout rotation systems requiring high torque in dusty conditions |
| Combine Harvesters | Driving feeder houses, augers, and tailings elevators for grain harvesting operations |
| Large Spreaders (Fertilizer/Manure) | Driving heavy-duty spreading mechanisms at controlled rotational speeds for uniform material distribution |
| Self-Propelled Sprayers | Powering hydraulic drive systems for large agricultural spraying equipment |
| Manure Handling Equipment | Driving heavy-duty pumps and agitation systems for liquid manure management |
Construction Equipment – The OMP400 is deployed in construction machinery where compact packaging, robust construction, high torque density, and durability are critical for demanding job site conditions.
| Equipment | Typical Function |
|---|---|
| Skid Steer Loaders / Compact Track Loaders | Driving auxiliary hydraulic circuits for heavy-duty attachments such as augers, trenchers, planers, and sweepers |
| Mini Excavators | Powering attachment rotation systems and auxiliary hydraulic functions for demanding excavation tasks |
| Backhoe Loaders | Driving attachment rotation systems and implement circuits for digging and loading operations |
| Small Trenchers | Driving cutting chain mechanisms for utility trenching applications |
| Concrete Mixers (Small to Medium) | Driving mixing drum rotation at controlled speeds for concrete transport and delivery |
Material Handling & Lifting Equipment – In material handling applications, the OMP400’s compact dimensions, high torque capability, and precise speed control enable efficient operation in tight spaces and demanding lifting environments.
| Equipment | Typical Function |
|---|---|
| Forklifts (Heavy-Duty) | Driving hydraulic systems for lifting, tilting, and attachment functions in heavy industrial forklifts |
| Aerial Work Platforms (Scissor Lifts, Boom Lifts) | Powering boom articulation, platform leveling, and drive systems for elevated work platforms |
| Conveyor Systems (Heavy-Duty) | Driving belt, chain, or roller conveyors for bulk material handling and industrial logistics |
| Industrial Winches | Providing controlled pulling and lifting power for heavy-duty winching applications |
| Pallet Stackers / Walkie Stackers | Powering lifting and positioning mechanisms for warehouse and distribution center operations |
Forestry Equipment – The OMP400 is well suited for forestry applications where equipment must operate reliably in rugged outdoor environments and handle heavy cutting loads.
| Equipment | Typical Function |
|---|---|
| Wood Chippers (Large Capacity) | Driving the chipper drum or disc at controlled speeds for high-volume wood processing |
| Brush Cutters / Mulchers | Powering cutting heads and mulching mechanisms for land clearing and vegetation management |
| Stump Grinders | Driving grinding wheels for stump removal operations |
| Log Splitters | Powering hydraulic splitting wedges for log processing |
Municipal & Environmental Equipment – The OMP400 delivers reliable performance for municipal service equipment operating in varied weather and terrain conditions.
| Equipment | Typical Function |
|---|---|
| Street Sweepers (Full-Size) | Driving main broom and gutter broom mechanisms for municipal street cleaning |
| Snow Blowers | Powering auger and impeller systems for snow removal operations |
| Sewer Cleaning Equipment | Driving high-pressure pump and hose reel systems for sewer maintenance |
Industrial & Manufacturing – In industrial environments, the OMP400 contributes to production efficiency and automation through its variable speed capability at constant torque and smooth, reliable operation.
| Equipment | Typical Function |
|---|---|
| Industrial Mixers & Agitators | Powering mixing paddles for high-viscosity material processing in chemical and food industries |
| Packaging Machinery | Powering wrapping, sealing, and palletizing systems for high-throughput production lines |
| Machine Tools (Heavy) | Driving indexing tables, rotary workstations, and tool changers for industrial machining |
| Test Rigs | Providing controlled rotational power for component and systems testing |
| Steel & Metal Processing Equipment | Driving auxiliary functions in rolling mills, coil handling, and metal forming equipment |
Road Building / Construction Equipment – The OMP400 is suitable for highway and road construction machinery requiring reliable hydraulic power for auxiliary functions.
| Equipment | Typical Function |
|---|---|
| Small Asphalt Pavers | Driving auger and conveyor systems for asphalt material distribution |
| Road Compactors / Rollers | Powering vibration systems and auxiliary hydraulic functions |
| Road Maintenance Equipment | Driving sweeping, spraying, and material handling functions for highway upkeep |
Other Applications – The motor is also used in:
Marine / Small Vessel Equipment: Deck machinery (capstans, mooring winches), fishing equipment (net drums, line haulers), steering gear systems.
Lawn & Turf Equipment: Large-area mowers, turf maintenance machinery, landscaping equipment.
Mining Equipment (Light): Conveyor drives, material handling systems in processing plants.
Oil & Gas Equipment: Valve actuators, auxiliary drives for well service equipment.
Special-Purpose Industrial Machinery: Custom industrial automation and processing equipment requiring high-torque, low-speed rotary actuation.
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss / Sauer-Danfoss |
| Series | OMP (Orbital Motor Series) |
| Model Code | OMP400 151-0618 |
| Interchangeable Part Numbers | 151-0318, 1510318, 1510618, OMP-400-151-0318, OMP-400-151-0618, OMP400-1510318, OMP400-1510618 |
| Displacement | 400 cm³/rev (24.4 in³/rev) |
| Motor Type | Gerotor (Orbital) / LSHT (Low-Speed High-Torque) |
| Rotation | Bi-directional (Reversible) |
| Maximum Continuous Speed | 195 rpm |
| Maximum Intermittent Speed | 245 rpm |
| Typical Operating Speed Range | 155 – 190 rpm |
| Minimum Stable Speed | ~15 – 20 rpm (typical for LSHT motors) |
| 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 (2,540 psi) |
| Maximum Intermittent Inlet Pressure | 200 bar (2,900 psi) |
| Maximum Peak Inlet Pressure | 225 bar (3,260 psi) |
| Maximum Continuous Torque | 300 Nm (2,660 lbf-in) |
| Maximum Intermittent Torque | 390 Nm (3,450 lbf-in) |
| Minimum Starting Torque (Continuous, at max ΔP) | 280 Nm (2,480 lbf-in) |
| Minimum Starting Torque (Intermittent, at max ΔP) | 370 Nm (3,280 lbf-in) |
| Maximum Continuous Flow | 60 L/min (15.9 gpm) |
| Maximum Intermittent Flow | 75 L/min (19.8 gpm) |
| Maximum Power Output | 4 – 7 kW (depending on operating conditions) |
| Shaft Type | Cylindrical, 25 mm diameter |
| Shaft Key | A8 × 7 × 32 mm (DIN 6885) |
| Mounting Flange | A2 (2-bolt SAE A, 106.1 mm PCD) |
| Port Style | Side ports |
| Main Port Thread | G 1/2 (BSPP) |
| Drain Port Thread | G 1/4 (BSPP) |
| Material | Cast iron housing |
| Finish | Black (RAL 9005) |
| Weight | Approximately 6.73 kg |
| Operating Temperature Range | -20°C to +80°C (-4°F to +176°F) |
| Fluid Compatibility | Mineral oils, synthetic oils, biodegradable fluids |
| Circuit Compatibility | Open-loop and closed-loop systems |
| Key Features | Advanced axial seal design (high back pressure tolerance), high-strength output shaft, high starting torque |
| Status | Active / Superseded by OMP X 400 (11186714) |
Supersession Information – The OMP400 151-0618 has been superseded by the enhanced Danfoss OMP X 400 (replacement part number 11186714). The OMP X series offers higher torque due to optimized drivetrain, higher bearing capacity compared to DH/DS series, improved shaft seal (225 bar rating), built-in check valve and drain connection as standard, improved painting according to corrosion class C3 (ISO 12944), and enhanced product performance with improved reliability and serviceability. For new installations or replacements, the OMP X 400 is the recommended current model.
Conclusion
The Danfoss OMP400 151-0618 is a robust, high-torque, large-displacement orbital hydraulic motor from Danfoss’s proven OMP series. With 400 cm³ displacement, maximum continuous torque of 300 Nm, continuous pressure rating of 175 bar inlet and 75 bar pressure drop (peak capability of 225 bar inlet, 160 bar ΔP), it delivers consistent, low-speed rotary power for medium to heavy-duty hydraulic applications.
Its defining features include high starting torque, smooth and quiet operation across the speed range, bi-directional rotation, compact cast iron construction (6.73 kg), standard A2 2-bolt SAE A mounting flange, 25 mm cylindrical shaft with DIN 6885 keyway, G 1/2 BSPP side ports, advanced axial seal design providing high back pressure tolerance, and Gerotor gear set with shaft distribution flow. The robust cast iron housing and high-strength output shaft ensure long service life even under harsh operating conditions.
These attributes make the OMP400 an ideal solution for applications requiring high torque with reliable low-speed rotary actuation — from agricultural round balers, forage harvesters, and large spreaders, to construction skid steer loaders and mini excavators, to material handling forklifts and conveyors, to forestry chippers and stump grinders, to municipal sweepers and snow blowers.
As a proven, reliable, and energy-efficient solution for LSHT applications, the Danfoss OMP400 151-0618 (and its OMP X 400 replacement) delivers consistent torque, reversible operation, and long-term dependability for machinery worldwide. Simple in structure yet robust in performance, this motor is a trusted choice for engineers and system integrators across agricultural, construction, material handling, forestry, municipal, industrial, and municipal equipment sectors.
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