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Danfoss OMS200 151F0504 Hydraulic Orbital Motor
Overview
The Danfoss OMS200 151F0504 is a medium-duty, fixed-displacement orbital hydraulic motor from the well-regarded Danfoss OMS Series. Originally part of the White Drive Products line (now Danfoss), the OMS200 is a true Low-Speed High-Torque (LSHT) motor that efficiently converts hydraulic energy into powerful mechanical rotation for a wide range of mobile and stationary applications. Recognized for its compact design, robust construction, high efficiency, and reliable performance, this motor offers an excellent balance between size and power, making it a versatile and cost-effective solution for original equipment manufacturers and replacement markets worldwide.
Technical Features
Gerotor / Geroller Orbital Design – The motor utilizes a proven Gerotor (Geroller) gear set design, which is the cornerstone of its high-torque, low-speed performance. This roller-equipped orbital technology ensures smooth operation, exceptionally high starting torque, high volumetric efficiency, and consistent performance throughout the motor's long service life.
Fixed Displacement (200 cm³) – The OMS200 has a geometric displacement of 200 cm³ (approximately 12.20 in³) per revolution. As a fixed-displacement motor, the output torque is directly proportional to the system pressure, while the rotational speed is directly proportional to the input flow rate. This simple, linear relationship allows for easy and precise stepless speed control using a simple flow control valve.
LSHT (Low-Speed, High-Torque) Characteristics – The motor is specifically designed for LSHT operation. It has a maximum continuous speed of 375 rpm and a maximum intermittent speed of 450 rpm, making it ideally suited for applications requiring powerful, slow rotation without additional gear reduction. The minimum stable speed can be as low as 10-15 rpm, enabling precise motion control and positioning.
Robust Pressure & Torque Ratings – The motor operates with a maximum continuous pressure drop of 175 bar (up to 210 bar for peak or select conditions) and a maximum peak pressure drop of 225 bar. In terms of torque, the OMS200 delivers a maximum continuous torque of 465–610 Nm (depending on source and configuration) and a maximum intermittent torque of 466–720 Nm. Some specifications list a peak torque capability of up to 650 Nm. The maximum continuous flow rating is typically 75 L/min, with an intermittent flow of 90 L/min. The maximum output power is approximately 11 kW to 16.5 kW, depending on operating conditions.
High Pressure Shaft Seal (HPS) & Back Pressure Tolerance – The motor features a high-pressure shaft seal design that allows it to tolerate significant return line back pressure without requiring a dedicated separate case drain line in many applications. This capability simplifies hydraulic system design, reduces component count, and allows the motor to be installed in series or parallel circuit configurations.
Tapered Roller Bearings for High Radial Loads – The output shaft is supported by tapered roller bearings. This design gives the OMS200 a high radial load capacity, enabling it to absorb both static and dynamic radial forces. This robust bearing support allows the motor to be directly coupled to its driven load (e.g., a wheel, drum, or sprocket) without the need for external bearings, expanding its range of use.
Bi-Directional Operation – Designed for true reversible operation, the OMS200 rotates clockwise or counter-clockwise by simply reversing the hydraulic flow. This eliminates the need for complex mechanical reversing mechanisms and provides flexible system design.
Compact & Robust Construction – The motor is built with a durable cast iron housing, providing the structural integrity needed for demanding operations. Its compact size and robust construction ensure longevity even under harsh operating conditions, such as high pressure, thin oil, or frequent reversals. The motor weighs approximately 11.1 kg (24.5 lbs) and has dimensions of approximately 400 mm in length, 160 mm in width, and 170 mm in height.
Standardized SAE Mounting & Shaft Configuration – The OMS200 features an SAE A 4-bolt square flange (ø82.55 mm pilot diameter, 4 x Ø13.5 mm mounting holes on ø106.4 mm bolt circle). The motor is equipped with a 32 mm diameter cylindrical output shaft with a parallel key (A10 x 8 x 45 mm, DIN 6885). This standardized interface ensures easy installation, global compatibility, and straightforward integration with a wide range of common hydraulic components.
Porting & Connections – The motor is equipped with G 1/2 (BSPP) side main ports (tightening torque 45–55 Nm) and a G 1/4 (BSPP) drain port, which are compatible with standard hydraulic fittings. The use of side ports simplifies plumbing and hose routing in tight installations.
Built-in Check Valves – The motor incorporates internal check valves. These valves are designed to prevent cavitation and cross-port leakage during overrunning or freewheeling load conditions, protecting the motor from internal damage during demanding operating cycles.
Wide Operating Temperature – The motor operates reliably across a broad temperature range of -20°C to +80°C (up to +90°C in some specs), 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 (e.g., ISO VG 68), synthetic oils, and biodegradable fluids. It operates effectively in both open-loop and closed-loop hydraulic systems.
Low Leakage Design – The OMS series is known for its excellent sealing and low internal leakage characteristics, which contribute to its high volumetric efficiency, reduced energy loss, and long-term reliability.
Core Functionalities
LSHT (Low-Speed, High-Torque) Performance – The OMS200 is specifically optimized for LSHT operation. Its orbital Geroller design provides high torque at low rotational speeds, enabling it to deliver consistent output across its speed range, from minimum stable speed (10-15 rpm) up to its maximum continuous speed of 375 rpm. If the application requires very smooth running at low speeds, the OMS series is recommended.
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 and costly mechanical transmissions.
High Starting Torque & Overload Capability – The Gerotor gear set provides high starting torque, ensuring smooth and reliable operation from a standstill, even when the motor must start under full load and overcome high breakaway loads. It also has a strong short-term overload capacity, allowing it to withstand peak torque demands (up to 650 Nm) for brief periods without damage.
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. This smoothness at low speeds is critical for applications such as conveyor drives and material handling.
Bi-Directional Drive – The motor can change rotational direction instantly by reversing the hydraulic flow, supporting applications that require forward-reverse cycling (e.g., winches, augers, sweeper brushes) without additional mechanical reversing components.
High Efficiency & Energy Savings – High mechanical and volumetric efficiency minimizes internal energy loss, converting a maximum amount of hydraulic energy into useful mechanical power. This efficiency reduces heat generation, overall system power consumption, and operating costs. The motors maintain high efficiency even at high pressures.
High Radial Load Absorption – The tapered roller bearings give the OMS200 a high radial load capacity, allowing it to be directly mounted to drive wheels, drums, or sprockets without external bearings. This simplifies the machine design and reduces cost.
Durability & Low Maintenance – The robust cast iron construction, high-quality materials, wear-resistant Geroller gear set, and tapered roller bearings minimize wear and extend service intervals. The motor can tolerate tough operating conditions, such as high pressure, thin oil, or frequent reversals, for long periods. Regular hydraulic oil and filter changes are the primary maintenance requirements, keeping operating costs low.
Reliable Overrunning Protection – The built-in check valves protect the motor against cavitation during overrunning loads and prevent cross-port leakage, ensuring safe operation in applications such as winches and hydrostatic drives where the load may drive the motor faster than the supplied flow.
Application Sectors
The Danfoss OMS200 151F0504 hydraulic motor is an ideal choice for a wide range of medium-duty industrial and mobile applications where a compact, efficient, and reliable LSHT drive is required. The OMS series motors are suitable for continuous operation under rough operating conditions, e.g., high pressure, thin oil, or frequent reversals. Primary uses include:
Agriculture & Turf Care
The OMS200 is widely 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 |
|---|---|
| Combine Harvesters | Driving feeder houses, augers, and harvesting mechanisms |
| Balers (Round & Square) | Driving bale chamber mechanisms, compression systems, and net wrapping |
| Forage Harvesters | Powering cutting and chopping mechanisms, feed rollers, and spouts |
| Spreaders (Fertilizer & Manure) | Driving the spreading mechanism at controlled rotational speeds |
| Self-Propelled Sprayers | Powering hydraulic drive systems for agricultural spraying |
| Sugar Cane Harvesters | Driving heavy-duty feed rollers and chopping mechanisms |
| Turf Care & Lawn Maintenance | Driving cutting decks and traction systems for large-area mowers and greens mowers |
Construction Equipment
The OMS200 is deployed in construction machinery where compact packaging, robust construction, moderate torque-to-weight ratio, and high radial load capacity are critical for demanding job site conditions.
| Equipment | Typical Function |
|---|---|
| Skid Steer Loaders / Compact Track Loaders | Driving auxiliary hydraulic circuits for attachments (augers, planers, brooms) |
| Mini Excavators | Powering auxiliary hydraulic attachments (augers, compactors, tilt rotators) |
| Backhoe Loaders | Powering attachment rotation systems and implement circuits |
| Trenchers | Driving cutting chain mechanisms and augers for utility trenching |
| Road Sweepers | Driving main broom and side brush mechanisms |
| Concrete Mixers (Small to Medium) | Driving mixing drum rotation at controlled speeds |
| Road Rollers / Compactors | Driving vibration systems and auxiliary hydraulic functions |
Forestry Equipment
The OMS200 is well-suited for forestry applications where equipment must operate reliably in rugged outdoor environments with high torque demands and high radial loads.
| Equipment | Typical Function |
|---|---|
| Wood Chippers | Driving the chipper drum or disc at controlled speeds |
| Brush Cutters / 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 |
| Forestry Harvesters / Forwarders | Driving auxiliary functions and feed rollers |
Material Handling & Logistics
In material handling applications, the OMS200's compact dimensions, moderate torque capability, and smooth low-speed operation 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, platform leveling, and drive systems |
| Pallet Stackers / Walkie Stackers | Powering lifting and positioning mechanisms for warehouse operations |
| Conveyor Systems | Driving belt or chain conveyors for bulk material handling and industrial logistics |
| Industrial Winches | Providing controlled pulling and lifting power for heavy-duty winching applications |
Industrial & Stationary Equipment
In industrial environments, the OMS200 contributes to production efficiency and automation through its variable speed capability at constant torque, smooth operation, and reliability.
| Equipment | Typical Function |
|---|---|
| Industrial Conveyors | Driving belt, chain, or roller conveyors at consistent speeds |
| 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 | Driving indexing tables, rotary workstations, and tool changers |
| Test Rigs | Providing controlled rotational power for component and systems testing |
| Injection Molding Machines | Driving auxiliary functions requiring low-speed, high-torque rotary motion |
Municipal & Environmental Equipment
The OMS200 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 |
| Refuse Collection Vehicles | Driving compactor and packing mechanisms |
| Sewer Cleaning Equipment | Driving high-pressure pump and hose reel systems |
Marine & Offshore
The OMS200 can be used in marine applications where compactness, corrosion resistance, and high torque are important.
| Equipment | Typical Function |
|---|---|
| Deck Machinery | Powering capstans, mooring winches, and windlasses |
| Steering Gear | Powering auxiliary steering systems on small to medium vessels |
| Fishing Equipment | Driving net drums, line haulers, and pot haulers |
Other Applications
Road Building / Construction Equipment: Compactors, small asphalt pavers (auger and conveyor 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 (formerly White Drive Products / Sauer-Danfoss) |
| Series | OMS (Orbital Motor Series) – Medium/Large LSHT |
| Model Code / Part Number | OMS200 151F0504 |
| Motor Type | Gerotor / Geroller LSHT Orbital Motor |
| Displacement (Geometric) | 200 cm³/rev (approx. 12.20 in³/rev) |
| Rotation | Bi-directional (reversible) |
| Maximum Continuous Speed | 375 rpm |
| Maximum Intermittent Speed | 450 rpm |
| Minimum Stable Speed | 10-15 rpm (load dependent) |
| Maximum Continuous Pressure Drop | 175 bar (2,540 psi) to 210 bar (3,045 psi) |
| Maximum Intermittent Pressure Drop | 200 bar (2,900 psi) |
| Maximum Peak Pressure Drop | 225 bar (3,260 psi) |
| Maximum Continuous Inlet Pressure | 250 bar (3,625 psi) |
| Maximum Continuous Flow | 75 L/min (19.8 gpm) |
| Maximum Intermittent Flow | 90 L/min (23.8 gpm) |
| Maximum Continuous Torque | 465–610 Nm (4,115–5,400 lbf-in) |
| Maximum Intermittent Torque | 466–720 Nm (4,125–6,370 lbf-in) |
| Maximum Peak Torque | Up to 650 Nm (5,750 lbf-in) |
| Maximum Continuous Output Power | 11–16.5 kW (depending on operating conditions) |
| Shaft Type | 32 mm diameter cylindrical shaft |
| Shaft Key | A10 x 8 x 45 mm (DIN 6885) |
| Mounting Flange | SAE A 4‑Bolt Square Flange (ø82.55 mm pilot dia.; 4 x Ø13.5 mm on ø106.4 mm PCD) |
| Port Style | Side ports |
| Main Port Thread | G 1/2 (BSPP, ISO 228/1) |
| Drain Port Thread | G 1/4 (BSPP) |
| Weight | 11.1–11.6 kg (24.5–25.6 lbs) |
| Dimensions (L x W x H) | 400 mm x 160 mm x 170 mm (approx.) |
| Housing Material | Cast iron |
| Operating Temperature Range | -20°C to +80°C (-4°F to +176°F) |
| Fluids | Mineral oils (e.g., ISO VG 68), synthetic oils, biodegradable fluids |
| Circuit Compatibility | Open-loop and closed-loop systems; suitable for series and parallel setups |
| Special Features | Built-in check valves; tapered roller bearings; high-pressure shaft seal (HPS); low leakage design; high radial load capacity |
| Status | Active / In Production (with superseding models available) |
Model Code / Product Number Breakdown
The product number 151F0504 is structured as follows:
151F-0504 – Type number as listed in the Paro component library.
OMS200-151F-0504 – Full code, with "151F" indicating a specific configuration (shaft, port, seal type, check valve option, etc.) and "0504" as the series variant code.
Compatibility – This code is often cross-referenced with other brands such as Eaton / White Hydraulics, M+S Hydraulic, BMS series (e.g., BMS 200cc), and various aftermarket manufacturers.
152F-xxxx variants – May indicate different shaft, port, or mounting configurations.
It is important to verify the exact code when replacing or cross-referencing parts, as the numbers 151F0504, 151F-0504, OMS200-151F-0504, and OMS200 151F0504 all refer to the same model.
Conclusion
The Danfoss OMS200 151F0504 is a robust, efficient, and highly versatile medium-duty orbital hydraulic motor that embodies Danfoss's industry leadership in LSHT gerotor motor technology. With its 200 cm³ displacement, 465–610 Nm continuous torque output, 375 rpm continuous speed capability, and minimum stable speed as low as 10-15 rpm, it is ideally suited for a wide range of medium-duty to heavy-duty applications.
Its defining features include a roller-equipped Geroller gear set providing high starting torque and constant torque output across a wide speed range, high pressure capability (175 bar continuous pressure drop, 250 bar inlet pressure), high back-pressure tolerance enabling series or parallel circuit use without a separate drain line, tapered roller bearings for exceptional radial load capacity, a rugged cast iron housing weighing 11.1 kg, bi-directional rotation, built-in check valves for overrunning protection, and a standardized SAE A 4-bolt square flange with 32 mm cylindrical shaft and G 1/2 side ports.
These attributes make the OMS200 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 OMS200 151F0504 delivers consistent torque, reversible operation, high radial load capacity, and long-term dependability for machinery worldwide.
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