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Danfoss OMS250 151F2205 Hydraulic Orbital Motor
Overview
The Danfoss OMS250 151F2205 is a fixed-displacement, low-speed high-torque (LSHT) orbital hydraulic motor from Danfoss‘s OMS series. Designed for medium to heavy-duty applications, this gerotor-type motor efficiently converts hydraulic pressure and flow into powerful, reliable rotary mechanical power across a wide range of demanding mobile and industrial environments. The OMS series is recognized for its compact yet robust construction, high torque density, smooth low-speed operation, and suitability for applications requiring consistent performance under challenging operating conditions.
Technical Features
Fixed-Displacement Gerotor (Orbital) Design
Motor Type: Fixed-displacement, bi-directional orbital motor utilizing a proven gerotor gear set. The motor features end‑face flow distribution technology, with a modern “plug-in rotor stator parameter design“ ensuring high efficiency, high working pressure, low starting pressure, stable operation, and bidirectional torque consistency.
Displacement: 250 cm³/rev (250 cc/rev), positioning it among the larger displacement models in the OMS series.
Pressure and Torque Capabilities
Maximum Continuous Pressure Drop: 125–160 bar. The motor can withstand up to 250 bar working pressure, making it suitable for high-pressure heavy-duty hydraulic systems.
Maximum Continuous Torque: 720 Nm (6,374 lbf-in)
Maximum Intermittent Torque: 870 Nm (7,701 lbf-in)
Maximum Continuous Power Output: 14.5 kW
This high torque density in a compact package makes it ideally suited for demanding applications that require powerful, slow rotation without additional gear reduction. The high torque output, both starting and running, is delivered efficiently across the operating range.
Speed and Flow Ratings
Maximum Continuous Speed: 300 rpm
Maximum Intermittent Speed: 360 rpm
Minimum Stable Speed: As low as 15 rpm (load-dependent), enabling precise motion control and positioning.
Maximum Continuous Flow: 75 L/min
Maximum Intermittent Flow: 90 L/min
The motor is capable of smooth, stable operation at very low speeds — a key characteristic of LSHT orbital motor design.
Shaft and Mounting Configuration
Shaft Type: 1 1/4 inch (31.75 mm) cylindrical shaft with standard European flange mounting.
Mounting Flange: Standard 4-hole flange.
Port Connections: Main ports: 7/8″‑14 UNF. Drain port: 7/16″‑20 UNF.
These standardized SAE interfaces ensure easy installation, global compatibility, and straightforward integration with common hydraulic components.
Durable Construction and Design Features
Housing: Robust cast iron construction with a black finish, providing structural integrity and durability for demanding operations. The cast iron body ensures high wear resistance and long service life even in tough environments.
Weight: Approximately 12.0 kg, offering high power density with manageable weight.
Dimensions: Maximum length 196 mm; L1: 43.5 mm; L2: 153 mm.
Bearing Design: The motor is engineered for durability and resistance to wear in continuous heavy-duty cycles.
Built-in Check Valves: Fitted with integrated check valves (option), which provide protection against cavitation and cross‑port leakage during overrunning or freewheeling load conditions, protecting the motor from internal damage.
High-Pressure Shaft Seal (HPS): Designed with an advanced high‑pressure shaft seal that can manage high return line back pressure without requiring a separate case drain line in many applications, simplifying hydraulic circuit design.
Low Leakage Design: Precision manufacturing ensures minimal internal leakage, high volumetric efficiency, and long-term reliability.
Efficiency and Performance
High Overall Efficiency: Combines high volumetric and mechanical efficiency to minimize energy loss, converting maximum hydraulic energy into useful mechanical power. This reduces heat generation and overall system power consumption, contributing to lower operating costs.
Smooth Running: The motor provides constant operating torque over a wide speed range, resulting in smooth, vibration‑free performance at both low and high speeds. This smooth operation is particularly beneficial for applications requiring stable and precise motion control.
Bi-Directional Operation
The OMS250 is fully reversible (bi-directional). Rotational direction is simply controlled by reversing the hydraulic flow, providing flexible system design for forward‑reverse cycling without the need for complex mechanical reversing mechanisms.
Operating Conditions
Ambient Operating Temperature: -20°C to +80°C, supporting use in both cold outdoor and hot industrial environments.
Fluid Compatibility: Compatible with a wide range of hydraulic fluids, including mineral oils, synthetic oils, and biodegradable fluids. Operates effectively in both open-loop and closed-loop hydraulic systems.
Recommended Cleanliness: To ensure optimal performance and maximum service life, hydraulic fluid cleanliness should meet ISO 4406 class 20/18/15 or better.
Core Functionalities
Low-Speed, High-Torque (LSHT) Performance
The OMS250 is specifically optimized for LSHT operation. Its gerotor design delivers high torque at low rotational speeds, maintaining consistent output from its minimum stable speed (as low as 15 rpm) up to its maximum continuous speed of 300 rpm. The motor is ideal for applications requiring powerful, slow rotation without the need for additional gear reduction.
Stepless Speed Control
As a fixed-displacement motor, output speed is infinitely variable and directly proportional to the hydraulic flow rate. Precise speed control from minimum to maximum is achieved simply and cost-effectively with a flow control valve, eliminating the need for complex mechanical transmissions.
High Starting Torque
The gerotor design provides high starting torque, ensuring smooth, reliable startup from a standstill, even when the motor must start under full load and overcome high breakaway loads. This is critical for applications with high inertia loads or frequent start-stop cycles.
Constant Torque Across Speed Range
The motor runs smoothly over its entire speed range and maintains a constant torque output regardless of speed fluctuations, ensuring consistent, predictable performance and load handling.
Bi-Directional Drive
Full reversible capability allows the motor to change rotational direction instantly by reversing the flow, supporting forward‑reverse cycling applications such as winches, augers, and sweeper brushes without additional mechanical reversing components.
High Back-Pressure Tolerance
The high‑pressure shaft seal (HPS) enables the motor to tolerate significant return line back pressure without requiring a separate drain line. This simplifies hydraulic system design, reduces component count, and allows installation in series or parallel circuit configurations.
Overrunning Protection
Integrated check valves (where fitted) protect against cavitation and cross‑port leakage during overrunning or freewheeling loads, ensuring safe operation in applications where the load may drive the motor faster than the supplied flow (e.g., winches, hydrostatic drives).
Energy-Efficient Operation
High mechanical and volumetric efficiency minimizes energy loss, converts maximum hydraulic energy into useful mechanical power, reduces heat generation and system power consumption, and contributes to lower operating costs.
Long Service Life and Low Maintenance
Robust cast iron construction, high‑quality materials, wear‑resistant gerotor gear set, and advanced sealing system minimize wear and extend service intervals. Proper fluid maintenance (regular oil and filter changes) ensures long-term operational stability with minimal downtime.
Application Sectors
The Danfoss OMS250 151F2205 is a versatile and robust hydraulic orbital motor ideal for a broad spectrum of medium to heavy-duty applications requiring high torque at low speeds, smooth and reliable operation, and compact, durable construction. It is well suited for both open and closed-loop hydraulic systems in work and propel functions. This motor is widely used across numerous industries where high torque, reliability, and long service life are essential.
| Industry Sector | Typical Applications |
|---|---|
| Agricultural Machinery | Combine harvesters (driving feeder houses, augers, and harvesting mechanisms), round and square balers (driving bale chamber mechanisms, compression systems, and net wrapping), forage harvesters (powering cutting and chopping mechanisms, feed rollers, and spouts), fertilizer and manure spreaders (driving spreading mechanisms at controlled speeds), self-propelled sprayers (powering hydraulic drive systems), sugar cane harvesters, and heavy tractors. |
| Construction Equipment | Skid steer loaders and compact track loaders (driving auxiliary hydraulic circuits for attachments such as augers, planers, brooms), mini excavators (powering auxiliary attachments and rotation systems), backhoe loaders (powering implement circuits and attachment rotation), trenchers (driving cutting chain mechanisms and augers), road sweepers (driving main broom and side brush mechanisms), concrete mixers, road rollers, and compactors. |
| Material Handling & Lifting Equipment | Forklifts (driving hydraulic systems for lifting and tilting loads), pallet stackers and walkie stackers (powering lifting and positioning mechanisms), industrial conveyors (driving belt, chain, or roller conveyors for bulk material handling and logistics), industrial winches (providing controlled pulling and lifting power), aerial work platforms (scissor lifts and boom lifts for boom articulation, platform levelling, and drive systems), and cranes. |
| Forestry Equipment | Wood chippers (driving the chipper drum or disc at controlled speeds), brush cutters and mulchers (powering cutting heads and mulching mechanisms for land clearing), stump grinders (driving grinding wheels for stump removal), log splitters (powering splitting wedges for log processing), and forestry harvesters/forwarders (powering feed rollers, delimbing knives, and drive systems). |
| Industrial & Stationary Equipment | Industrial mixers and agitators (powering mixing paddles for high-viscosity material processing in chemical and food industries), packaging machinery (powering wrapping, sealing, and palletizing systems), machine tools (driving indexing tables, rotary workstations, and tool changers), test rigs (providing controlled rotational power for component and system testing), injection molding machines (driving auxiliary functions), and heavy industrial automation equipment. |
| Municipal & Environmental Equipment | Full-size street sweepers (driving main broom and gutter broom mechanisms for municipal street cleaning), snow blowers (powering auger and impeller systems for snow removal), refuse collection vehicles (driving compactor and packing mechanisms), and general municipal cleaning and maintenance vehicles. |
| Lawn & Turf Equipment | Large-area mowers, greens mowers, turf maintenance machinery, and professional landscaping equipment requiring reliable, low-speed, high-torque hydraulic drive for cutting decks and traction systems. |
| Marine & Offshore | Deck machinery (powering capstans, mooring winches, and windlasses), steering gear (powering auxiliary steering systems on small to medium vessels), and fishing equipment (driving net drums, line haulers, and pot haulers). |
| Road Building & Construction | Small asphalt pavers (auger and conveyor systems), road maintenance equipment, and compactors. |
| Mining (Light Duty) | Conveyor drives and material handling systems in processing plants. |
| Special-Purpose Industrial Machinery | Custom industrial automation and processing equipment requiring high‑torque, low‑speed rotary actuation and reliable performance in challenging environments. |
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss (formerly Sauer‑Danfoss / White Drive Products) |
| Series | OMS (Orbital Motor Series – Medium/Large LSHT) |
| Model Code / Part Number | OMS250 151F2205 (also known as 151F-2205, OMS250‑151F‑2205, OMS250151F2205) |
| Motor Type | Fixed-displacement, bi-directional gerotor (orbital) LSHT motor |
| Displacement (Geometric) | 250 cm³/rev (250 cc/rev) |
| Maximum Continuous Speed | 300 rpm |
| Maximum Intermittent Speed | 360 rpm |
| Minimum Stable Speed | ≈15 rpm (load-dependent) |
| Maximum Continuous Torque | 720 Nm (6,374 lbf-in) |
| Maximum Intermittent Torque | 870 Nm (7,701 lbf-in) |
| Maximum Continuous Pressure Drop | 125–160 bar |
| Working Pressure | 250 bar max. |
| Maximum Continuous Flow | 75 L/min |
| Maximum Intermittent Flow | 90 L/min |
| Maximum Continuous Power | 14.5 kW |
| Shaft Type | 1 1/4″ (31.75 mm) cylindrical shaft |
| Mounting Flange | European standard 4‑hole flange |
| Main Port Thread | 7/8″‑14 UNF |
| Drain Port Thread | 7/16″‑20 UNF |
| Housing Material | Cast iron |
| Finish / Color | Black |
| Weight | ≈12.0 kg (approx. 26.5 lbs) |
| Dimensions | Lmax: 196 mm; L1: 43.5 mm; L2: 153 mm |
| Ambient Operating Temperature | -20°C to +80°C (-4°F to +176°F) |
| Recommended Hydraulic Fluid | Mineral oils (e.g., ISO VG 68), synthetic oils, biodegradable fluids |
| Circuit Compatibility | Open-loop and closed-loop systems |
| Special Features | End‑face flow distribution; high‑pressure shaft seal (HPS); integrated check valves; high starting torque; constant torque across speed range; smooth low‑speed operation; bidirectional capability; robust cast iron construction; low internal leakage |
| Compatible Replacement Part Numbers | 151F-2205, OMS250‑151F‑2205, OMS250151F2205, 151F2205 |
Conclusion
The Danfoss OMS250 151F2205 is a robust, efficient, and highly versatile medium to heavy-duty orbital hydraulic motor that embodies Danfoss‘s industry‑leading LSHT gerotor technology. With its 250 cm³ displacement, 720 Nm continuous torque output (870 Nm intermittent), 300 rpm continuous speed capability, and minimum stable speed as low as 15 rpm, it is exceptionally well suited for a wide range of demanding applications that require powerful, controlled low‑speed rotation.
Its defining features include a gerotor gear set providing high starting torque and constant torque output across a wide speed range, high pressure capability (250 bar working pressure), high back‑pressure tolerance enabling use without a separate drain line (HPS design), end‑face flow distribution for high volumetric efficiency and long motor life, integrated check valves for overrunning protection, and a rugged cast iron housing weighing approximately 12.0 kg.
These attributes make the OMS250 151F2205 an excellent, energy‑efficient solution for agricultural machinery (harvesters, balers, forage harvesters, spreaders), construction equipment (skid steer loaders, mini excavators, trenchers, sweepers), material handling systems (forklifts, aerial lifts, conveyor drives, winches), forestry equipment (chippers, stump grinders, brush cutters, log splitters), industrial equipment (mixers, packaging machinery, machine tools, injection molding machines), municipal equipment (street sweepers, snow blowers, refuse vehicles), and marine deck machinery.
As a proven, reliable, and energy‑efficient solution for LSHT applications, the Danfoss OMS250 151F2205 delivers consistent torque, smooth and stable operation at both low and high speeds, reversible capability, high radial load capacity, and long‑term dependability for machinery worldwide.
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