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Danfoss OMS160 151F0503 Hydraulic Orbital Motor
Overview
The Danfoss OMS160 151F0503 is a medium-duty, low-speed high-torque (LSHT) orbital hydraulic motor from Danfoss's OMS series. Engineered for fixed-displacement, bi-directional operation, it efficiently converts hydraulic energy into reliable mechanical rotation for a wide spectrum of mobile and stationary applications. Recognized for its compact size, robust cast-iron construction, and high efficiency, this motor is a versatile solution where consistent torque across a broad speed range and dependable performance in demanding environments are essential.
Technical Features
Gerotor (Orbital) Gear Set with Roller Teeth — The motor employs a durable Gerotor gear set featuring roller-equipped teeth. This advanced design ensures smooth, high-torque output at low rotational speeds, increases overall operating efficiency, provides high starting torque, and guarantees a long operational life. The OMS series utilizes a roller set (Gerotor) design that ensures high efficiency and smooth operation, especially at low speeds.
Fixed Displacement & LSHT Characteristics — The OMS160 has a geometric displacement of approximately 160 cm³ (159.7 cm³) per revolution, classifying it as a medium-sized LSHT motor. As a fixed-displacement motor, its output torque is determined by system pressure, while its rotational speed is directly proportional to the input flow rate, facilitating easy stepless speed control with a simple flow control valve. The motor features a maximum continuous output speed of 470 rpm and a maximum intermittent output speed of 560 rpm. This motor is suitable for applications requiring moderate torque and speed, making it versatile for a wide range of machinery and equipment.
High Pressure & Torque Capability — The motor delivers robust pressure ratings. It operates at a maximum continuous pressure drop of approximately 170 bar (some sources indicate 175 bar) and intermittent pressure drops up to 200 bar (275 bar for certain OMS variants). The peak pressure drop can reach 225 bar. In terms of torque, the OMS160 151F0503 generates a maximum continuous output torque of 490 Nm and a maximum intermittent output torque of 600 Nm. Some sources also list a continuous torque of 380 Nm and an intermittent torque of 530 Nm for comparable OMS160 models. This high torque output in a compact frame ensures exceptional performance for heavy-duty tasks.
Advanced End-Face Flow Distribution — The OMS160 utilizes an advanced end-face flow distribution structure that ensures high flow distribution precision. This design feature allows for automatic compensation for wear over time, guaranteeing high volumetric efficiency and a long motor lifespan. It also contributes to the motor's low starting pressure, high overall efficiency, and excellent maintenance of high performance throughout its operating life. The series uses a end-face flow distribution structure, featuring a high working pressure, high efficiency, good overall performance retention, and long operating life.
Robust Tapered Roller Bearings — The OMS160 is equipped with tapered roller bearings supporting the output shaft. This configuration enables the motor to absorb both static and dynamic radial loads effectively. The tapered roller bearings significantly enhance the motor's ability to withstand heavy radial and axial forces. This robust support structure expands the motor's range of use, as it can often be direct-coupled to its driven load (e.g., a wheel or a drum) without requiring additional external bearings. Besides the separately driven and hydraulically balanced disc valve, hydraulic and mechanical losses are reduced to a minimum, giving the motors high efficiency even at high pressures.
High Back Pressure Tolerance & Simplified Circuits — Featuring a high-pressure shaft seal (HPS) design, the OMS160 can handle high return line pressures without needing a dedicated separate case drain line in most applications. This high back-pressure capability allows the motor to be installed in series or parallel within the hydraulic circuit, significantly simplifying system design, reducing component count, and improving overall reliability.
Standardized SAE Mounting & Porting — The motor features a 4-bolt SAE B square flange (some sources reference SAE A, 4-bolt, with Ø82.55 mm pilot diameter) and a 32 mm diameter cylindrical output shaft with a parallel key. The main ports are G 1/2 BSPP, and the drain port is G 1/4 BSPP. The standardized interface ensures easy installation, global compatibility, and straightforward integration with a wide range of common hydraulic components and adapters.
High Efficiency & Long Service Life — The combination of the advanced Gerotor roller set, precision end-face flow distribution, and tapered roller bearings results in high mechanical and volumetric efficiency. This efficiency minimizes energy loss, reduces system heat generation, and lowers overall power consumption. The OMS160 is built with high-quality materials and designed for durability and longevity, ensuring consistent performance and long-term operational stability in rugged industrial settings.
Bi-Directional & Smooth Operation — Designed for true reversible (bi-directional) operation, the OMS160 rotates clockwise or counter-clockwise by simply reversing the hydraulic flow. This capability eliminates the need for complex mechanical reversing components. The motor runs smoothly over its entire speed range, maintaining constant torque output regardless of speed fluctuations, ensuring reliable and vibration-free operation.
Core Functionalities
Low-Speed High-Torque (LSHT) Performance — The OMS160 is specifically optimized for LSHT operation. Its Gerotor gear set design provides high torque at low rotational speeds, enabling it to deliver consistent output across its speed range, from its minimum stable speed (as low as 15-20 rpm) up to its maximum continuous speed of 470 rpm. If the application requires very smooth running at low speeds, the choice of OMS 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 & Strong Overload Capacity — 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 large loads for short periods without damage.
High Efficiency & Energy Savings — The high mechanical and volumetric efficiency minimizes energy loss, converting a maximum amount of hydraulic energy into useful mechanical power. This efficiency reduces heat generation and overall system power consumption.
Durability & Low Maintenance — The robust construction, high-quality materials, wear-resistant gear set, and precision components minimize wear and extend service intervals. Regular hydraulic oil and filter changes are the primary maintenance requirements, keeping operating costs low.
Application Sectors
The Danfoss OMS160 151F0503 hydraulic motor is ideal for a wide range of medium-duty industrial and mobile applications where a compact, efficient, and reliable low-speed, high-torque 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
Combine harvesters (driving feeder houses, augers, and harvesting mechanisms)
Balers (driving bale chamber mechanisms and compression systems)
Forage harvesters (powering cutting and chopping mechanisms, feed rollers)
Spreaders and self-propelled sprayers
Turf care and lawn maintenance machinery (driving cutting decks and traction systems)
Harvesting and planting equipment
Construction Equipment
Mini excavators (powering auxiliary hydraulic circuits for attachments like augers)
Skid steer loaders and backhoe loaders
Trenchers (driving cutting chain mechanisms) and sweepers
Road rollers and compactors
Material Handling & Lifting Equipment
Forklifts (driving hydraulic systems for lifting and tilting loads)
Aerial work platforms (scissor lifts, boom lifts – powering boom articulation and platform levelling)
Pallet stackers and pallet trucks
Conveyor systems (driving belt or chain conveyors)
Industrial winches
Forestry Equipment
Wood chippers and stump grinders
Brush cutters and mulchers
Log splitters
Industrial & Stationary Equipment
Injection molding machines and die-casting machinery
Mixers and agitators for industrial processing
Packaging machinery (wrapping, sealing, palletizing systems)
Rotary tables and indexers
Machine tools (driving tool changers) and test rigs
Mining equipment and conveyors
Municipal & Environmental Equipment
Street sweepers and gutter brooms
Snow blowers and removal equipment
Sweepers and spreaders
Refuse collection vehicles and compactors
Marine & Offshore Equipment
Deck machinery (capstans, mooring winches)
Steering gear systems
Net handling equipment and winches
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss / Sauer-Danfoss |
| Series | OMS (Orbital Motor Series) |
| Model Code / Part Number | OMS160 151F0503 (151F-0503) |
| Motor Type | Gerotor (Orbital) / LSHT (Low-Speed High-Torque) |
| Displacement (Geometric) | 160 cm³/rev (approx. 159.7 cm³) |
| Rotation | Bi-directional (reversible) |
| Maximum Continuous Speed | 470 rpm |
| Maximum Intermittent Speed | 560 rpm |
| Minimum Stable Speed | 15-20 rpm (load dependent) |
| Maximum Continuous Torque | 490 Nm (some sources: 380 Nm) |
| Maximum Intermittent Torque | 600 Nm (some sources: 530 Nm) |
| Maximum Continuous Pressure Drop | 170–175 bar (some sources: 207 bar / 3000 psi) |
| Maximum Intermittent Pressure Drop | 200 bar (some sources: 245 bar / 3550 psi) |
| Maximum Peak Pressure Drop | 225 bar |
| Maximum Continuous Flow | 75 L/min (some sources: 65 L/min) |
| Maximum Intermittent Flow | Up to 115 L/min (depending on source) |
| Maximum Power Output | 18–22 kW (depending on operating conditions) |
| Shaft Type | 32 mm diameter cylindrical with parallel key |
| Flange Type | 4-bolt SAE B square flange (some SAE A ref) |
| Main Port Thread | G 1/2 (BSPP) |
| Drain Port Thread | G 1/4 (BSPP) |
| Port Style | Side ports |
| Housing Material | Cast iron |
| Finish / Color | Black (RAL 9005) |
| Weight | Approx. 10.7 kg |
| Operating Temperature Range | -20°C to +80°C (typical) |
| Fluids | Mineral oils, synthetic oils, biodegradable fluids |
| Circuit Compatibility | Open-loop and closed-loop systems |
| Special Features | End-face flow distribution, roller-type gear set, tapered roller bearings, high back-pressure tolerance, integrated check valves (some models), low leakage design |
| Applicable Industries | Industrial automation, mining, construction, marine, chemical, energy, metallurgy, paper, heavy machinery |
Conclusion
The Danfoss OMS160 151F0503 is a robust, efficient, and highly versatile medium-duty orbital hydraulic motor that embodies Danfoss's leadership in LSHT gerotor motor technology. With its 160 cm³ displacement, 490 Nm continuous torque output, 470 rpm continuous speed capability, and minimum stable speed as low as 15-20 rpm, it is ideally suited for a wide range of demanding applications.
Its defining features include a roller-equipped Gerotor gear set for high starting torque and smooth operation, advanced end-face flow distribution for high efficiency and long life, robust tapered roller bearings for high radial load capacity, high back-pressure tolerance enabling series/parallel circuit use without a separate drain line, a rugged cast-iron housing weighing approximately 10.7 kg, bi-directional rotation, and a standardized 4-bolt SAE B flange with 32 mm cylindrical shaft and G 1/2 side ports.
These attributes make the OMS160 an excellent, energy-efficient solution for agricultural machinery (harvesters, balers, forage harvesters), 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 (injection molding machines, mixers, packaging machinery), municipal equipment (street sweepers, snow blowers), and marine deck machinery.
As a proven, reliable, and energy-efficient solution for LSHT applications, the Danfoss OMS160 151F0503 delivers consistent torque, reversible operation, and long-term dependability for machinery worldwide.
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