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Danfoss OMS100 151F2309 Hydraulic Orbital Motor
Overview
The Danfoss OMS100 151F2309 is a low‑speed, high‑torque (LSHT) orbital hydraulic motor from the Danfoss OMS series. Designed as a fixed‑displacement, bi‑directional gerotor motor, it efficiently converts hydraulic energy into powerful and reliable mechanical rotation. The OMS series is recognized for its compact footprint, robust cast‑iron construction, and suitability for medium‑duty applications requiring consistent torque and moderate speed. This motor is widely used across agricultural, construction, forestry, and industrial sectors.
Technical Features
Gerotor (Orbital) Gear Set Design — The motor uses a proven gerotor (orbital) gear set, delivering smooth, high‑torque output at low rotational speeds. This design provides high starting torque and maintains constant torque across a wide operating speed range.
Fixed Displacement — The OMS100 has a geometric displacement of 100 cm³ per revolution. As a fixed‑displacement motor, its output torque is determined by system pressure, while its speed is directly proportional to the input flow rate. This simple relationship allows for easy stepless speed regulation using a flow control valve.
LSHT (Low‑Speed, High‑Torque) Characteristics — The motor is specifically designed for LSHT operation. It has a maximum continuous speed of 750 rpm and a maximum intermittent speed of 900 rpm. The minimum stable speed can be as low as 15‑20 rpm, enabling precise motion control and positioning.
Torque Output — The motor delivers a maximum continuous torque of 305 Nm (2,700 lbf·in) and a maximum intermittent torque of 390 Nm (3,450 lbf·in). The maximum peak torque is 295‑390 Nm depending on the application and pressure conditions. This high torque output in a compact package ensures excellent performance for demanding tasks.
Pressure Ratings — The motor operates with a maximum continuous working pressure of 210 bar, a maximum intermittent working pressure of 275 bar, and a maximum peak pressure of 295 bar. The continuous pressure drop is rated at 175‑210 bar, with intermittent pressure drops up to 275 bar. These generous pressure margins provide reliable overload protection for transient load spikes.
Flow & Power Ratings — The motor operates with a maximum continuous flow rate of 75 L/min and a maximum intermittent flow rate of 90 L/min. It delivers a maximum continuous power output of 18 kW and an intermittent output of 22.5 kW, providing ample power for a wide range of applications. The efficiency can reach up to 95%.
High‑Pressure Shaft Seal — The motor features a high‑pressure shaft seal, allowing it to manage high oil return pressures without the need for a dedicated drain line in most applications. This simplifies hydraulic circuit design and reduces component count. The drain port thread is 1/4 BSP.
Bi‑Directional Operation — Designed for reversible operation, the motor rotates clockwise or counter‑clockwise by simply reversing the hydraulic flow. This bi‑directional capability eliminates the need for complex mechanical reversing mechanisms.
Robust Cast‑Iron Construction — The motor is built with a durable cast‑iron housing, finished in black or black and silver, providing the structural integrity needed for demanding operations. Its robust design ensures longevity even under harsh operating conditions.
Standardized Mounting & Shaft — The motor features a 32 mm cylindrical shaft with a straight or parallel key (A8 × 7 × 32 mm DIN 6885). The flange is a standard 4‑hole square flange with a pilot diameter of 82.55 mm (SAE A standard), ensuring easy integration with a wide range of hydraulic components.
Porting — The main ports are G 1/2 (BSPP), and the drain port is G 1/4 (BSPP). The port style is side‑ported, which simplifies plumbing integration.
Wide Operating Temperature — The motor operates reliably across a temperature range of ‑30°C to +90°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.
Model Naming — The product is identified by model number OMS100 151F2309, also seen as OMS100‑151F‑2309 or OMS100151F2309.
Core Functionalities
LSHT Performance — The OMS100 is specifically designed for LSHT operation. Its gerotor design provides high torque at low rotational speeds, enabling it to deliver consistent torque output across its operating speed range, from its minimum stable speed (15‑20 rpm) up to 750 rpm continuous (900 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 gerotor design provides high starting torque, enabling it to easily overcome heavy breakaway loads from a standstill. The starting torque is 305 Nm continuous, ensuring smooth and reliable operation even when 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.
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.
High Back‑Pressure Tolerance — The high‑pressure shaft seal allows the motor to tolerate significant back pressure without requiring a drain line, simplifying hydraulic circuit design and enabling use in series or parallel setups.
Energy Efficient Operation — High mechanical and volumetric efficiency ensures minimal energy loss, converting a maximum amount of hydraulic energy into useful mechanical power. Efficiency can reach up to 95%, reducing heat generation and overall system power consumption.
Simple Installation — The motor is easy to install and arrange, with a compact design that saves installation space and time. The flange mounting type and standardized porting simplify integration into new or existing hydraulic systems.
Low Maintenance — The robust construction, high‑quality materials, and simple design minimize wear and extend service intervals. Regular hydraulic oil and filter changes are the primary maintenance requirements, keeping operating costs low.
Long Service Life — The combination of a robust cast‑iron housing, gerotor gear set, high‑strength output shaft, and high‑pressure shaft seal ensures a long service life under demanding conditions, leading to reduced downtime and lower total cost of ownership.
Application Sectors
The Danfoss OMS100 151F2309 is widely used across numerous industries where low‑speed, high‑torque performance, reliability, and compact design are essential. The OMS series is suitable for both open‑circuit and closed‑circuit hydraulic systems for work and propel applications.
Agriculture & Turf Care
The OMS100 is commonly used in agricultural machinery where its ability to deliver high torque at low speeds and withstand outdoor conditions is essential. Its compact and lightweight design simplifies integration into space‑constrained machinery.
| Equipment | Typical Function |
|---|---|
| Tractors | Power transmission for auxiliary functions and implement drives |
| Combine Harvesters | Driving feeder houses, augers, and harvesting mechanisms |
| Forage Harvesters | Powering cutting and chopping mechanisms, feed rollers |
| Balers | Driving bale chamber mechanisms and compression systems |
| Seeders / Planters | Powering seed metering and planting mechanisms |
| Spreaders | Driving the spreading mechanism at controlled rotational speeds |
| Self‑Propelled Sprayers | Powering hydraulic drive systems for agricultural spraying |
| Turf Care & Lawn Maintenance Machinery | Driving cutting decks and traction systems |
Construction Equipment
The OMS100 is deployed in construction machinery where compact packaging, robust construction, and moderate torque‑to‑weight ratio are critical for demanding job site conditions.
| Equipment | Typical Function |
|---|---|
| Mini Excavators | Powering auxiliary hydraulic circuits for attachments (augers, compactors) |
| Skid Steer Loaders | Driving auxiliary hydraulic circuits for attachments |
| Backhoe Loaders | Powering attachment rotation systems |
| Small Trenchers | Driving cutting chain mechanisms |
| Concrete Mixers | Driving mixing drum rotation |
| Sweepers | Driving main broom and side brush mechanisms |
Forestry Equipment
The OMS100 is suited for forestry applications where equipment must operate reliably in rugged outdoor environments with high torque demands.
| Equipment | Typical Function |
|---|---|
| Wood Chippers | Driving the chipper drum or disc at controlled speeds |
| Brush Cutters | Powering cutting heads and mulching mechanisms |
| Stump Grinders | Driving grinding wheels |
| Log Splitters | Powering splitting wedges for log processing |
| Loggers / Forestry Harvesters | Driving feed rollers, delimbing knives, and cutting systems |
Material Handling & Lifting Equipment
In material handling applications, the OMS100's compact dimensions and moderate torque capability enable efficient operation in tight spaces and demanding lifting environments.
| Equipment | Typical Function |
|---|---|
| Forklifts | Driving hydraulic systems for lifting and tilting loads |
| Aerial Work Platforms (Scissor Lifts, Boom Lifts) | Powering boom articulation and platform levelling |
| Pallet Stackers | Powering lifting and positioning mechanisms |
| Conveyor Systems | Driving belt or chain conveyors in industrial facilities |
| Industrial Winches | Providing controlled pulling and lifting power |
| Cranes | Powering lifting and travel mechanisms |
Industrial & Manufacturing
In industrial environments, the OMS100 contributes to production efficiency and automation through its variable speed capability at constant torque.
| Equipment | Typical Function |
|---|---|
| Industrial Conveyors | Driving belt, chain, or roller conveyors at consistent speeds |
| Mixers & Agitators | Powering mixing paddles for industrial processing |
| Packaging Machinery | Powering wrapping, sealing, and palletizing systems |
| Machine Tools | Driving indexing tables and tool changers |
| Test Rigs | Providing controlled rotational power for component testing |
Municipal & Environmental Equipment
The OMS100 delivers reliable performance for municipal service equipment operating in varied weather and terrain conditions.
| Equipment | Typical Function |
|---|---|
| Street Sweepers | Driving main broom and gutter broom mechanisms for municipal street cleaning |
| Sanitation Vehicles | Powering hydraulic systems for waste collection |
| Snow Blowers | Powering auger and impeller systems for snow removal |
| Lawn Maintenance Equipment | Driving cutting decks for municipal landscaping |
Marine & Small Vessel Equipment
The OMS100 can be used in marine applications where compactness and corrosion resistance are important.
| Equipment | Typical Function |
|---|---|
| Deck Machinery | Powering capstans and mooring winches |
| Steering Gear | Powering auxiliary steering systems on small to medium vessels |
| Fishing Equipment | Driving net drums and line haulers |
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss |
| Series | OMS (Orbital Motor Series) |
| Model Code | OMS100 151F2309 |
| Interchangeable Part Numbers | OMS100‑151F‑2309, OMS100151F2309, 151F‑2309 |
| Motor Type | Gerotor (Orbital) / LSHT (Low‑Speed High‑Torque) |
| Displacement | 100 cm³/rev (100 cc/rev) |
| Rotation | Bi‑directional (reversible) |
| Maximum Continuous Speed | 750 rpm |
| Maximum Intermittent Speed | 900 rpm |
| Minimum Stable Speed | 15‑20 rpm (load dependent) |
| Maximum Continuous Torque | 305 Nm (2,700 lbf·in) |
| Maximum Intermittent Torque | 390 Nm (3,450 lbf·in) |
| Maximum Peak Torque | 295‑390 Nm |
| Maximum Continuous Working Pressure | 210 bar (3,045 psi) |
| Maximum Intermittent Working Pressure | 275 bar (3,990 psi) |
| Maximum Peak Working Pressure | 295 bar (4,278 psi) |
| Maximum Continuous Pressure Drop | 175‑210 bar |
| Maximum Intermittent Pressure Drop | 275 bar |
| Maximum Continuous Flow | 75 L/min (19.8 gpm) |
| Maximum Intermittent Flow | 90 L/min (23.8 gpm) |
| Maximum Continuous Power | 18 kW (24.1 hp) |
| Maximum Intermittent Power | 22.5 kW (30.2 hp) |
| Efficiency | Up to 95% |
| Shaft Type | 32 mm diameter cylindrical / parallel key shaft |
| Shaft Key | A8 × 7 × 32 mm (DIN 6885) |
| Flange Type | 4‑hole square flange (SAE A, 82.55 mm pilot diameter) |
| Main Port Thread | G 1/2 (BSPP) |
| Drain Port Thread | G 1/4 (BSPP) |
| Port Style | Side‑ported |
| Housing Material | Cast iron |
| Finish / Color | Black (RAL 9005) / Black and silver |
| Weight | Approx. 12 kg (may vary by configuration) |
| Operating Temperature | ‑30°C to +90°C |
| Drain Line Requirement | Not required in most applications (high‑pressure shaft seal) |
| Fluid Compatibility | Mineral oils, synthetic oils, biodegradable fluids |
| Circuit Compatibility | Open‑loop and closed‑loop systems |
| Country of Origin | Denmark |
Conclusion
The Danfoss OMS100 151F2309 is a robust, efficient, and highly versatile medium‑duty orbital hydraulic motor that exemplifies Danfoss's leadership in LSHT technology. With its 100 cm³ displacement, 305 Nm continuous torque output, 750 rpm continuous speed capability, and 15‑20 rpm minimum stable speed, it is ideally suited for a wide range of medium‑duty applications.
Its defining features include a gerotor gear set providing high starting torque and constant torque output across a wide speed range, high pressure capability (210 bar continuous, 295 bar peak), high back‑pressure tolerance enabling series or parallel circuit use without a drain line, a robust cast‑iron housing weighing approximately 12 kg, bi‑directional rotation, and a standard 4‑hole SAE A flange with 32 mm cylindrical shaft and G 1/2 side ports.
These attributes make the OMS100 an excellent, energy‑efficient solution for agricultural machinery (tractors, harvesters, balers, sprayers), construction equipment (mini excavators, skid steer loaders, trenchers), material handling systems (forklifts, aerial lifts, conveyor drives), forestry equipment (chippers, stump grinders, brush cutters), industrial equipment (mixers, packaging machinery, machine tools), and municipal equipment (street sweepers, snow blowers).
As a proven, reliable, and energy‑efficient solution for LSHT applications, the Danfoss OMS100 151F2309 delivers consistent torque, reversible operation, and long‑term dependability for machinery worldwide.
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