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Danfoss OMR315 151-0617 Hydraulic Orbital Motor
Overview
The Danfoss OMR315 151-0617 is a low-speed, high-torque (LSHT) orbital hydraulic motor from Danfoss's OMR series. Designed as a fixed-displacement, bi-directional gerotor motor, it efficiently converts hydraulic energy into mechanical rotational power for a wide range of mobile and stationary applications. The OMR series is recognized for its durable cast iron construction, compact design, high reliability, and suitability for medium-duty applications requiring moderate torque and low rotational speeds.
Technical Features
Gerotor (Orbital) Gear Set Design — The motor utilizes a proven gerotor (orbital) gear set design. This design delivers smooth, high-torque output at low rotational speeds and provides good low-speed performance with a high starting torque, ensuring reliable operation from a standstill.
Fixed Displacement — The OMR315 has a geometric displacement of 315 cm³ per revolution. As a fixed-displacement motor, its output torque is determined by the system pressure, while its speed is directly controlled by the input flow rate. This simple, reliable relationship allows for easy stepless speed regulation using a flow control valve.
Low-Speed, High-Torque (LSHT) Characteristics — The motor is specifically designed for LSHT applications. It has a maximum continuous speed of 190 rpm and a maximum intermittent speed of 240 rpm, with a minimum stable speed as low as 15 rpm. This makes it ideal for applications requiring powerful, slow rotation without additional gear reduction.
Pressure & Torque Ratings — The motor operates at a rated pressure of 70–100 bar. It delivers a maximum continuous torque of 300 Nm, a maximum peak torque of 610 Nm, and has a maximum output power of 5 kW. The maximum continuous flow rate is 60 L/min.
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.
High Starting Torque — The gerotor design provides high starting torque, enabling the motor to easily overcome heavy breakaway loads from a standstill. This is critical for applications requiring the motor to start under full load.
Cast Iron Construction — The motor is built with a durable cast iron housing, providing structural integrity and long service life even in demanding operating conditions. Its robust construction ensures durability and reliability in tough environments.
Robust Sealing System — The motor is equipped with a high-pressure shaft seal (HPS), allowing it to handle significant back pressure without a dedicated drain line in many applications. This simplifies hydraulic circuit design and improves overall system reliability.
Standardized Mounting & Porting — The motor features a 25 mm diameter cylindrical shaft with a parallel key (A8×7×32 mm DIN 6885) and an A2 flange (SAE A2 oval 2-bolt flange). The main ports are side-ported G 1/2 BSPP with a drain port thread of 1/4" BSP. The SAE A2 (2-hole) flange standard simplifies installation and ensures compatibility with a wide range of hydraulic components.
Compact Dimensions — The motor has a compact overall length of 182.5 mm (L) and a length of 54.8 mm (L1), making it suitable for installation in equipment with limited space.
Bi-Directional Rotation — The motor supports fully reversible rotation, offering flexibility for bidirectional drive applications without performance compromise.
Wide Operating Temperature — The motor operates reliably across a broad temperature range, 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, making it adaptable to diverse application requirements.
Replacement Part Number — The OMR315 151-0617 supersedes 151-0717. It has been superseded by the enhanced Danfoss OMR X 315 (11186652), which offers up to 15% higher torque and a stronger bearing capacity.
Core Functionalities
Low-Speed, High-Torque (LSHT) Performance — The motor 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 of 15 rpm up to 190 rpm continuous (240 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. This is critical for applications where the motor must start under full load.
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.
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.
Energy Efficient Operation — High mechanical and volumetric efficiency ensures minimal energy loss, converting a maximum amount of hydraulic energy into useful mechanical power. This reduces heat generation and overall system power consumption.
Simple Installation — The motor is easy to install and arrange, with low investment costs. It can be used in series or parallel in the hydraulic system, providing flexibility for system designers.
Long Service Life — The combination of a robust cast iron housing, gerotor gear set, high-strength output shaft, and robust sealing system ensures a long service life under demanding conditions, leading to reduced downtime and lower total cost of ownership.
Application Sectors
The Danfoss OMR315 151-0617 is widely used across numerous industries where low-speed, high-torque performance, reliability, and compact design are essential. The OMR series is suitable for both open-circuit and closed-circuit hydraulic systems for work and propel applications.
| Industry Sector | Typical Applications |
|---|---|
| Agricultural Machinery | Balers, forage harvesters, combine harvesters, spreaders, self-propelled sprayers, and other agricultural equipment requiring high torque and reliable operation in demanding outdoor conditions. |
| Construction Equipment | Mini excavators, skid steer loaders, backhoe loaders, trenchers, and concrete mixers for powering auxiliary circuits and drive functions. |
| Material Handling & Lifting Equipment | Forklifts, pallet stackers, aerial work platforms (scissor and boom lifts), industrial winches, and conveyor drives in warehouse and distribution centers where compactness and high torque are critical. |
| Forestry Equipment | Wood chippers, stump grinders, brush cutters, log splitters, and forestry harvesters, where equipment must operate reliably in rugged outdoor environments with high torque demands. |
| Lawn & Turf Equipment | Commercial mowers, grass cutters, landscaping machinery, and turf maintenance equipment, leveraging the motor's compact and lightweight design. |
| Municipal Equipment | Street sweepers (main broom and side brush drives), road maintenance machinery, and municipal cleaning vehicles requiring reliable, low-speed, high-torque actuation. |
| Industrial & Stationary Equipment | Conveyor systems, rotary tables, mixing equipment, industrial automation, and test rigs requiring consistent, high-torque rotary power. |
| Special Machinery | Auger drives, winch drives, sweeper brush drives, slewing applications for cranes, and small road-roller propel systems. |
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss / Sauer-Danfoss |
| Series | OMR (Orbital Motor Series) |
| Model Code | OMR315 151-0617 |
| Displacement | 315–315.7 cm³ (approx. 315 cm³) |
| Motor Type | Gerotor (Orbital) / LSHT (Low-Speed High-Torque) |
| Rotation | Bi-directional (reversible) |
| Maximum Continuous Speed | 190 rpm |
| Maximum Intermittent Speed | 240 rpm |
| Minimum Stable Speed | 15 rpm (load dependent) |
| Maximum Continuous Pressure Drop | 70–100 bar |
| Maximum Peak Working Pressure | 150 bar |
| Maximum Continuous Torque | 300 Nm |
| Maximum Peak Torque | 610 Nm |
| Maximum Continuous Power | 5 kW |
| Maximum Continuous Flow | 60 L/min |
| Shaft Type | 25 mm diameter cylindrical / parallel shaft |
| Shaft Key | A8 × 7 × 32 mm (DIN 6885) |
| Flange Type | SAE A2 oval flange (2‑bolt, 106.1 mm PCD) |
| Port Style | Side port |
| Main Port Thread | G 1/2 BSPP |
| Drain Port Thread | 1/4" BSP |
| Material | Cast iron |
| Color | Black |
| Length (L) | 182.5 mm |
| Length (L1) | 54.8 mm |
| Weight | Approx. 9.0 kg (some sources indicate 6.73 kg) |
| Supersedes | 151-0717 |
| Superseded by | OMR X 315 (11186652) |
Supersession Information
The Danfoss OMR315 151-0617 has been discontinued and has been superseded by the enhanced Danfoss OMR X 315 (part number 11186652). The OMR X series offers several performance improvements, including up to 15% higher torque compared to previous OMR versions, a stronger bearing capacity that withstands higher radial loads in the application, an improved high-pressure shaft seal (HPS) with a 225 bar rating, and an integrated drain connection as standard. For new installations or replacements requiring maximum performance, the OMR X 315 is the recommended current model.
Conclusion
The Danfoss OMR315 151-0617 is a robust, reliable, and compact low-speed, high-torque (LSHT) orbital hydraulic motor that demonstrates Danfoss's leadership in gerotor motor technology. Its 315 cm³ displacement, 300 Nm continuous torque output, 610 Nm peak torque capability, 5 kW maximum power, and 190 rpm continuous speed capability make it ideally suited for a wide range of medium-duty applications.
Its defining features include a cast iron construction for durability, a gerotor gear set providing high starting torque and constant torque output across a wide speed range, bi-directional rotation for flexible reversible operation, a 25 mm cylindrical shaft with an A2 flange (SAE A2 oval 2-bolt flange), side-ported G 1/2 BSPP connections, and a minimum stable speed as low as 15 rpm enabling precise motion control.
These attributes make the OMR315 an excellent, energy-efficient solution for agricultural machinery (balers, forage harvesters, combine harvesters), construction equipment (skid steer loaders, mini excavators, trenchers), material handling systems (forklifts, aerial lifts, conveyor drives), forestry equipment (chippers, stump grinders, brush cutters), municipal equipment (street sweepers), and industrial applications.
As a proven, reliable choice, the OMR315 provides a balance of performance and longevity suitable for a wide range of medium-duty hydraulic applications. For new installations requiring maximum performance, the upgraded OMR X 315 (11186652) is now recommended, offering higher torque (up to 15% more), improved bearing capacity for higher radial loads, and a higher-rated high-pressure shaft seal (225 bar).
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