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Danfoss OMV630 151B3108 Hydraulic Orbital Motor
Overview
The Danfoss OMV630 151B3108 is a fixed‑displacement, low‑speed high‑torque (LSHT) orbital hydraulic motor from the Danfoss OMV series--3. Designed for the most demanding industrial and mobile applications, this Geroler-type motor efficiently converts hydraulic power into high torque at low rotational speeds-3-5. As a large‑displacement model in the OMV family, the OMV630 is engineered for heavy‑duty tasks requiring exceptional power, durability, and reliability in extreme operating conditions--1.
Technical Features
Geroler Orbital Design with Disc Valve System – The motor utilizes an advanced Geroler (roller‑equipped orbital) gear set with a disc valve distribution system--18. This design ensures smooth, high‑torque output, high efficiency, and reliable performance even at high pressures.
Large Fixed Displacement – The OMV630 has a geometric displacement of 629.1 cm³ per revolution--18. As a fixed‑displacement motor, output torque is directly proportional to system pressure, while rotational speed is directly proportional to input flow rate. This enables simple and precise stepless speed control using a standard flow control valve-.
High Pressure & Torque Ratings – The motor operates with a maximum continuous pressure drop of 180 bar, an intermittent pressure drop of 210 bar, and a peak pressure drop of 240 bar-3-5. It delivers a maximum continuous torque of 1,660 Nm and a maximum intermittent torque of 1,940 Nm--3-5. This high torque density makes it ideally suited for applications requiring powerful, controlled low‑speed rotation without additional gear reduction.
Speed and Flow Performance – The motor has a maximum continuous speed of 315 rpm and a maximum intermittent speed of 380 rpm--3. The maximum continuous flow rating is 200 L/min, with an intermittent flow of 240 L/min-3-5. The minimum stable speed is as low as 15 rpm, enabling precise motion control and positioning-.
Splined Output Shaft – The motor is equipped with a splined 16T output shaft with a 2‑1/8 inch diameter-1-3-18, providing robust torque transmission and secure coupling to driven equipment.
Tapered Roller Bearings – The output shaft is supported by tapered roller bearings at both the front and rear ends-1-3-18. These high‑capacity bearings can withstand high static and dynamic radial and axial loads-3-5, allowing the motor to be directly coupled to wheels, drums, or sprockets without requiring external bearings in many applications-1-9.
Integrated Check Valves – The motor includes internal check valves that provide protection against cavitation and cross‑port leakage during overrunning or freewheeling load conditions-1-18, ensuring safe operation in applications where the load may drive the motor faster than the supplied flow.
High Back Pressure Tolerance – Featuring a high‑pressure shaft seal, the motor can tolerate significant return line back pressure without requiring a separate case drain line in many applications-1-9. This simplifies hydraulic circuit design and allows the motor to be installed in series or parallel configurations.
Standard Porting – Main ports are side‑ported G 1 BSP-1-3-18, and the drain port is G 1/4 BSP-1-3-5. The mounting flange is a 4‑bolt standard type with a 160 mm centering diameter-3-5-18.
Compact and Rugged Construction – The motor is built with a durable cast iron housing and weighs 34.9 kg-3-5. Its compact size provides high power density for space‑constrained installations while offering the structural integrity required for demanding heavy‑duty operations-.
Wide Operating Temperature and Fluid Compatibility – The motor operates reliably across an ambient temperature range of -20°C to +80°C-3-5. It is compatible with a wide range of hydraulic fluids, including mineral oils, synthetic oils, and biodegradable fluids-1-9, and can be used in both open‑loop and closed‑loop hydraulic systems-1-9.
High Efficiency – The advanced disc valve distribution system minimizes hydraulic and mechanical losses, resulting in high efficiency even at high pressures-3-5.
Core Functionalities
LSHT (Low‑Speed High‑Torque) Performance – The OMV630 is specifically optimized for LSHT operation. It delivers very high torque at low rotational speeds, maintaining consistent output from its minimum stable speed (approximately 15 rpm) up to its continuous speed of 315 rpm-3-5. The motor provides smooth operation at very low speeds-3-5, making it ideal for applications requiring precise heavy‑load positioning and controlled slow movement.
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 standard flow control valve.
High Starting Torque – The Geroler gear set provides very high starting torque-1-9, ensuring smooth and reliable startup from a standstill, even when the motor must start under full load and overcome high breakaway loads-.
Constant Torque Across Speed Range – The motor maintains constant torque output regardless of speed fluctuations-1-9, ensuring consistent and predictable performance throughout its operating range.
Bi‑Directional Operation – The motor is fully reversible (bi‑directional). Rotational direction is controlled simply by reversing the hydraulic flow, supporting forward‑reverse cycling without additional mechanical reversing components.
High Radial and Axial Load Absorption – Tapered roller bearings on both the front and rear of the output shaft provide the motor with very high radial and axial bearing capacity-3-5, allowing it to be directly mounted to drive wheels, drums, or sprockets without external bearings in many applications-1-9.
Energy‑Efficient Operation – High mechanical and volumetric efficiency minimizes internal energy loss, converts maximum hydraulic energy into useful mechanical power, reduces heat generation, and lowers overall system power consumption-3-5.
Overrunning Protection – Integrated check valves protect the motor against cavitation and cross‑port leakage during overrunning or freewheeling load conditions-1-18, ensuring safe operation in winching, lowering, or other load‑induced overrun scenarios.
Series and Parallel Circuit Compatibility – The high‑pressure shaft seal enables the motor to tolerate high return line back pressure without a separate drain line-1-9, allowing installation in series or parallel hydraulic circuit configurations.
Long Service Life – The robust cast iron construction, high‑quality materials, advanced Geroler gear set, tapered roller bearings, and integrated check valves ensure long‑term reliability even under continuous operation in demanding conditions. The OMV series is suitable for continuous operation under rough conditions, including high pressure and frequent reversals-3-5.
Application Sectors
The Danfoss OMV630 151B3108 is a versatile and extremely robust hydraulic orbital motor, ideal for a broad spectrum of heavy‑duty applications where very high torque, reliability, smooth low‑speed operation, and the ability to handle extreme conditions are required--3-5. The OMV series is widely used in heavy construction, mining, large agricultural machinery, heavy material handling, forestry, marine, and industrial equipment--1-9.
Construction Equipment – Suitable for heavy‑duty construction machinery-3-5: large excavators (track drives and swing drives), large wheel loaders, crawler dozers, large backhoe loaders, heavy trenchers, large road rollers and compactors, large asphalt pavers, heavy concrete mixers, and piling rigs.
Agricultural Machinery – For applications requiring high torque and reliability-3-5: large combine harvesters, large round and square balers, large forage harvesters, self‑propelled high‑capacity sprayers, sugar cane harvesters, and large tractors.
Material Handling and Lifting Equipment – Ideal for forklifts and other lifting equipment-3-5: heavy‑duty forklifts, container handlers, reach stackers, large industrial winches, heavy‑duty conveyor systems, large aerial work platforms, and large cranes.
Forestry Equipment – Used in forestry machinery for heavy‑duty operations-3-5: large wood chippers, heavy brush cutters and mulchers, large stump grinders, large log splitters, forestry harvesters and forwarders, and heavy‑duty winches-.
Lawn and Turf Equipment – Suitable for landscaping and maintenance machinery-3-5: large‑area commercial mowers and turf maintenance machinery.
Industrial Equipment – Industrial mixers and agitators, large machine tools, heavy packaging machinery, large test rigs, large injection molding machines, and heavy industrial automation equipment.
Mining Equipment – Mining haul truck auxiliary drives, large mining excavators, crushers (rotary feed drives), heavy conveyor systems, and material handling equipment in mineral processing plants-.
Marine and Offshore – Deck machinery (large capstans, mooring winches, windlasses), steering gear, fishing equipment (large net drums, line haulers), anchor handling winches, and offshore platform equipment.
Special‑Purpose Heavy Machinery – Custom heavy industrial automation and processing equipment requiring very high‑torque, low‑speed rotary actuation-1-9.
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss |
| Series | OMV (Orbital Motor Series – Heavy‑Duty LSHT) |
| Model Code / Part Number | OMV630 151B3108 |
| Motor Type | Fixed‑displacement, bi‑directionally reversible Geroler LSHT orbital motor- |
| Displacement | 629.1 cm³/rev--18 |
| Rotation | Bi‑directional (reversible) |
| Maximum Continuous Speed | 315 rpm--3 |
| Maximum Intermittent Speed | 380 rpm--3-5 |
| Minimum Stable Speed | ~15 rpm (load‑dependent)- |
| Maximum Continuous Torque | 1,660 Nm--3-5 |
| Maximum Intermittent Torque | 1,940 Nm-3-5 |
| Maximum Continuous Pressure Drop | 180 bar-3-5 |
| Maximum Intermittent Pressure Drop | 210 bar-3-5 |
| Maximum Peak Pressure Drop | 240 bar-3-5 |
| Maximum Continuous Flow | 200 L/min-3-5 |
| Maximum Intermittent Flow | 240 L/min-3-5 |
| Shaft Type | Splined 16T output shaft, 2‑1/8 inch diameter-1-3-18 |
| Mounting Flange | 4‑bolt standard flange with 160 mm centering diameter-3-5-18 |
| Main Port Thread | G 1 BSP (side ports)-1-3-18 |
| Drain Port | G 1/4 BSP-1-3-5 |
| Housing Material | Cast iron- |
| Weight | 34.9 kg-3-5 |
| Operating Temperature Range | –20°C to +80°C-3-5 |
| Bearing Type | Tapered roller bearings (front and rear)-1-18 |
| Check Valves | Yes (integrated)-1-18 |
| Seal Kit | 151B0129-3-5-18 |
| Circuit Compatibility | Open‑loop and closed‑loop systems; suitable for series and parallel setups-1-9 |
Conclusion
The Danfoss OMV630 151B3108 is an exceptionally robust, high‑performance, and highly versatile heavy‑duty orbital hydraulic motor from Danfoss‘s OMV series. With its 629.1 cm³ displacement, 1,660 Nm continuous torque output, 315 rpm continuous speed capability, 15 rpm minimum stable speed, and 200 L/min flow rating, it is superbly suited for the most demanding LSHT applications that require extremely high torque, powerful controlled low‑speed rotation without additional gear reduction, and continuous operation in harsh environments.
Its defining features include a Geroler gear set with disc valve distribution for very high efficiency and long life, high pressure capability (180 bar continuous pressure drop with 240 bar peak), high back‑pressure tolerance enabling series or parallel circuit use without a separate drain line, tapered roller bearings on both the front and rear for exceptional radial and axial load capacity, integrated check valves for overrunning protection, a rugged cast iron housing weighing 34.9 kg, bi‑directional rotation, and a standard 4‑bolt flange with a splined 16T output shaft and G 1 BSP side ports.
These attributes make the OMV630 151B3108 an outstanding, energy‑efficient solution for a wide range of heavy‑duty mobile and stationary equipment, including large construction machinery, mining equipment, large agricultural machinery, heavy material handling systems, forestry equipment, marine deck machinery, large industrial equipment, and special‑purpose heavy machinery.
As a proven, reliable, and energy‑efficient solution for the most demanding LSHT applications, the Danfoss OMV630 151B3108 delivers exceptionally high consistent torque, extremely smooth low‑speed operation, reversible capability, very high radial load capacity, and long‑term dependability for heavy machinery worldwide.
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