Danfoss OMT200 151B3001 Hydraulic Orbital Motor
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Danfoss OMT200 151B3001 Hydraulic Orbital Motor
Overview
The Danfoss OMT200 151B3001 is a fixed displacement, high-torque, low-speed (LSHT) hydraulic orbital motor from Danfoss’s OMT series. The OMT series is specifically engineered for medium to heavy-duty applications where high torque, robust construction, and reliable operation under extreme conditions are paramount.
Technical Features
Geroler Gear Set with Disc Flow Distribution – The motor utilizes an advanced Geroler gear set with disc flow distribution, where the distributor valve is separated from the output shaft and driven by a short cardan shaft. This design incorporates automatic wear compensation for high volumetric efficiency, long service life, and smooth operation. A separate, hydraulically balanced distributor disc minimizes hydraulic and mechanical losses, resulting in high efficiency even at high pressures.
Fixed Displacement – With a geometric displacement of 201.4 cm³ per revolution (nominal displacement 200 cm³/rev), the OMT200 is a fixed-displacement motor where the torque output is directly proportional to the system pressure, and the speed is directly proportional to the input flow rate.
High Pressure Capability – The motor has a maximum continuous pressure rating of 200 bar (2,900 psi) and an intermittent pressure rating of 240 bar (3,480 psi). It can withstand peak pressure spikes up to 280 bar (4,060 psi). The OMT and OMV series overall support rated pressures up to 275 bar (3,990 psi) for a variety of medium to heavy-duty applications running in extreme conditions.
High Torque Output – It delivers a maximum continuous torque of 590 Nm (5,220 lbf-in) and an intermittent torque of 710 Nm (6,280 lbf-in). The torque output is consistent across the speed range, delivering high torque even at low rotational speeds and high starting torque.
Speed and Flow Performance – The motor has a maximum continuous speed of 625 rpm and a maximum intermittent speed of 750 rpm. The maximum continuous flow rating is 125 L/min. The minimum stable speed is as low as 15 rpm.
Robust Bearing System – The output shaft is supported by tapered roller bearings, capable of withstanding high static and dynamic radial and axial loads. This robust bearing system makes the motor suitable for absorbing significant radial forces and allows it to be direct-coupled to its load (e.g., wheels, drums, sprockets) without the need for external bearings.
High Back Pressure Tolerance – The motor features a high-pressure shaft seal (HPS) that allows it to handle significant return line back pressure without requiring a separate case drain line in many applications. This simplifies hydraulic circuit design, reduces component count, and enables series or parallel installations.
Integrated Check Valves – The motor includes internal check valves that provide protection against cavitation and cross-port leakage during overrunning or freewheeling load conditions.
Bi-Directional Operation – The OMT200 is a fully reversible (bi-directional) motor. Rotational direction is simply controlled by reversing the hydraulic flow.
Compact and Rugged Construction – The motor is built with a durable cast iron housing with a black finish. It has a net weight of 21.0 kg and dimensions of approximately 233 mm in length, 160 mm in width, and 170 mm in height.
Standardized Mounting and Ports – The motor features a standard 4-hole square flange (125 mm pilot diameter, 160 mm bolt hole circle). It is equipped with a 40 mm diameter cylindrical output shaft with a parallel key (A12 x 8 x 70 mm, DIN 6885). The main ports are G 3/4 BSP (side ports), and the drain port is G 1/4 BSP.
Wide Operating Conditions – The motor is designed to operate reliably at ambient temperatures ranging from -30°C to +90°C. It is compatible with a wide range of hydraulic fluids, including mineral oils, synthetic oils, and biodegradable fluids. The recommended oil viscosity is 20-75 cSt. It maintains low internal leakage and high volumetric efficiency, contributing to its energy efficiency. Optionally, the motor can be customized with features such as speed sensors, Viton shaft seals, and paint.
Core Functionalities
Low-Speed, High-Torque (LSHT) Operation – The motor is specifically optimized for LSHT applications. It delivers high torque at low rotational speeds, maintaining consistent output from its minimum stable speed (as low as 15 rpm) up to its continuous speed of 625 rpm. For applications requiring very smooth low-speed running, the OMT series is recommended.
Stepless Speed Control – As a fixed-displacement motor, its speed is infinitely variable and directly proportional to the hydraulic flow rate, allowing precise speed control with a simple flow control valve, eliminating complex mechanical transmissions.
High Starting Torque and Breakaway Capability – The Geroler gear set provides high starting torque, ensuring smooth and reliable startup even under full load and high breakaway loads.
Constant Torque Across the Speed Range – The motor maintains constant torque output regardless of speed fluctuations, ensuring consistent and predictable performance.
Bi-Directional Drive – The motor can change rotational direction instantly by reversing the hydraulic flow, supporting forward-reverse cycling without additional mechanical components.
High Radial Load Absorption – The tapered roller bearings allow the motor to be directly mounted to drive wheels, drums, or sprockets without external bearings, simplifying machine design.
Energy-Efficient Operation – High mechanical and volumetric efficiency minimizes energy loss, converts a maximum amount of hydraulic energy into useful mechanical power, reduces heat generation, and lowers system power consumption.
Long Service Life – The robust construction and high-efficiency design ensure a long service life, even in continuous, demanding operations.
Application Sectors
The Danfoss OMT200 151B3001 is ideal for a broad range of medium to heavy-duty applications across various industries. The OMT series is widely used in construction, mining, forestry, and agriculture.
Construction Equipment – Skid steer loaders, mini excavators (track drives), backhoe loaders, trenchers (cutting chain mechanisms), road rollers, compactors, asphalt pavers (auger and conveyor systems), and concrete mixers.
Agricultural Machinery – Combine harvesters, forage harvesters, balers (round and square), self-propelled sprayers, sugar cane harvesters, and other heavy agricultural equipment requiring high torque and reliability in demanding field conditions.
Material Handling & Lifting Equipment – Forklifts (lifting and tilting), pallet stackers, industrial winches, heavy-duty conveyor systems (belt, chain, roller), and aerial work platforms (scissor lifts, boom lifts).
Forestry Equipment – Wood chippers, brush cutters, mulchers, stump grinders, log splitters, forestry harvesters, and winches requiring high torque in rugged outdoor environments.
Industrial & Stationary Equipment – Industrial mixers and agitators (high-viscosity processing), packaging machinery (wrapping, sealing, palletizing systems), machine tools (indexing tables, rotary workstations), test rigs, injection molding machines (auxiliary functions), and crushers.
Municipal & Environmental Equipment – Street sweepers (main broom, gutter broom), snow blowers (auger, impeller drives), and refuse collection vehicles (compactor mechanisms).
Marine & Offshore – Deck machinery (capstans, mooring winches, windlasses), steering gear, and fishing equipment (net drums, line haulers).
Mining (Light Duty) – Conveyor drives and material handling systems in processing plants.
Special-Purpose Machinery – Custom industrial automation and processing equipment requiring high-torque, low-speed rotary actuation.
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss / Sauer-Danfoss |
| Series | OMT (Orbital Motor Series – Medium to Heavy-Duty LSHT) |
| Model Code / Part Number | OMT200 151B3001 |
| Motor Type | Fixed displacement, bi-directional Geroler/Orbital LSHT motor |
| Displacement | 201.4 cm³/rev (20 cm³/rev nominal) |
| Rotation | Bi-directional (reversible) |
| Maximum Continuous Speed | 625 rpm |
| Maximum Intermittent Speed | 750 rpm |
| Minimum Stable Speed | 15 rpm (load dependent) |
| Maximum Continuous Torque | 590 Nm (5,220 lbf-in) |
| Maximum Intermittent Torque | 710 Nm (6,280 lbf-in) |
| Maximum Continuous Pressure Drop | 200 bar (2,900 psi) |
| Maximum Intermittent Pressure Drop | 240 bar (3,480 psi) |
| Maximum Peak Pressure | 280 bar (4,060 psi) |
| Maximum Continuous Flow | 125 L/min (33.0 gpm) |
| Maximum Intermittent Flow | 150 L/min (39.6 gpm) |
| Maximum Continuous Output Power | 33.5 kW (44.9 hp) |
| Maximum Intermittent Output Power | 40.0 kW (53.6 hp) |
| Shaft Type | 40 mm diameter cylindrical shaft |
| Shaft Key | Parallel key A12 x 8 x 70 mm (DIN 6885) |
| Mounting Flange | Standard 4-hole square flange (125 mm pilot, 160 mm PCD) |
| Main Port Thread | G 3/4 BSP (side ports) |
| Drain Port | G 1/4 BSP |
| Housing Material | Cast iron |
| Finish / Color | Black (RAL 9005) |
| Net Weight | 21.0 kg (46.3 lbs) |
| Dimensions (L x W x H) | 233 mm x 160 mm x 170 mm (approx.) |
| Ambient Operating Temperature | -30°C to +90°C (-22°F to +194°F) |
| Recommended Oil Viscosity | 20-75 cSt (mineral oil) |
| Hydraulic Fluids | Mineral oils, synthetic oils, biodegradable fluids |
| Circuit Compatibility | Open-loop and closed-loop systems; suitable for series and parallel setups |
| Special Features | Geroler gear set with disc flow distribution; tapered roller bearings; high-pressure shaft seal (HPS); integrated check valves; high starting torque; constant torque across speed range; high radial load capacity; long service life |
| Optional Features | Speed sensors, Viton shaft seals, paint |
Conclusion
The Danfoss OMT200 151B3001 is a robust, efficient, and highly versatile medium to heavy-duty orbital hydraulic motor from Danfoss’s OMT series. With its 201.4 cm³ displacement, 590 Nm continuous torque output (710 Nm intermittent), 625 rpm continuous speed, 15 rpm minimum stable speed, and 33.5 kW continuous power output, it is exceptionally well suited for demanding LSHT applications that require powerful, controlled low-speed rotation without additional gear reduction.
Its defining features include a Geroler gear set with disc flow distribution for high efficiency and long life, high pressure capability (200 bar continuous with 240 bar intermittent and 280 bar peak), high back-pressure tolerance enabling series or parallel circuit use without a separate drain line, tapered roller bearings for exceptional radial load capacity (allowing direct wheel or sprocket mounting), integrated check valves for overrunning protection, a rugged cast iron housing weighing 21.0 kg, bi-directional rotation, and a standard 4-hole square flange with 40 mm cylindrical shaft and G 3/4 BSP side ports.
These attributes make the OMT200 151B3001 an excellent, energy-efficient solution for a wide range of medium to heavy-duty mobile and stationary equipment, including agricultural machinery, construction equipment, material handling systems, forestry machinery, industrial machinery, municipal equipment, and marine deck equipment.
As a proven, reliable, and energy-efficient solution, the Danfoss OMT200 151B3001 delivers consistent high torque, smooth low-speed operation, reversible capability, high radial load capacity, and long-term dependability for machinery worldwide. The OMT series is suitable for continuous operation under rough conditions, including high pressure, thin oil, or frequent reversals, making this motor a trusted choice for engineers and system integrators across many sectors.
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