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Help CenterDanfoss OMT400T 151B3057 Hydraulic Orbital Motor
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Danfoss OMT400T 151B3057 Hydraulic Orbital Motor
Overview
The Danfoss OMT400T 151B3057 is a fixed‑displacement, low‑speed high‑torque (LSHT) orbital hydraulic motor from the OMT family. It is designed specifically for heavy‑duty applications where high torque, reliability, and the ability to operate continuously under extreme conditions are essential. As a “T” variant within the OMT400 series, this motor is configured with a straight output shaft and a special flange equipped with a tachometer connection, making it particularly suitable for applications requiring precise speed monitoring and control.
Technical Features
Geroler Orbital Design with Disc Valve Distribution – The motor uses a Geroler gear set with a disc valve distribution system. The distributor valve is separated from the output shaft and driven by a short cardan shaft, which is hydraulically balanced to minimise hydraulic and mechanical losses. This design provides automatic wear compensation, resulting in high volumetric and mechanical efficiency, long service life, and excellent starting characteristics even at high pressures.
Fixed Displacement – The motor has a displacement of 400 cm³ per revolution. As a fixed‑displacement motor, output torque is directly proportional to the applied system pressure, while rotational speed is directly proportional to the input flow rate. This characteristic enables simple and precise speed control using a standard flow control valve.
High Torque Output – The OMT400T 151B3057 delivers a maximum continuous torque of 1080 Nm and an intermittent torque of 1260 Nm. This high torque density in a compact package makes it ideally suited for demanding LSHT applications that require powerful, controlled low‑speed rotation without additional gear reduction.
Pressure and Flow Ratings – The motor operates with a maximum continuous pressure of 200 bar (2,900 psi) and an intermittent pressure of 240 bar (3,480 psi). The maximum continuous flow rate is 125 L/min. These generous ratings allow the motor to handle heavy loads while maintaining efficient operation over long periods.
Speed Range – Maximum continuous speed is 305 rpm, with an intermittent speed of up to 365 rpm. The minimum stable speed is typically around 15 rpm, enabling precise motion control and positioning.
Tapered Roller Bearings – The output shaft is supported by tapered roller bearings, which can withstand high static and dynamic radial and axial loads. This robust bearing system allows the motor to be directly coupled to wheels, drums, or sprockets without requiring external bearings, simplifying machine design.
High Back Pressure Tolerance – Featuring a high‑pressure shaft seal (HPS), the motor can tolerate significant return line back pressure without needing a separate case drain line in many applications. This simplifies hydraulic circuit design and allows the motor to be installed in series or parallel configurations.
Special Flange with Tacho Connection – A key distinguishing feature of this variant is the special flange with a tachometer (tacho) connection, which enables precise speed monitoring for applications requiring tight speed control or closed‑loop feedback.
Straight Output Shaft – The motor is equipped with a straight shaft of 40 mm diameter and 12 mm width, providing robust torque transmission and simple coupling to driven equipment.
Compact and Rugged Construction – The motor is built with a cast iron housing and weighs approximately 23.0 kg. Its dimensions are 259 mm (length) × 160 mm (width) × 170 mm (height), making it compact enough for space‑limited installations while providing the structural integrity required for demanding operations.
Porting and Connections – Main ports are G 3/4 BSP (side ports), and the drain port is G 1/4 BSP. The porting layout simplifies hose routing in tight installations.
Wide Operating Temperature and Fluid Compatibility – The motor operates reliably across an ambient temperature range of -20°C to +80°C. It is compatible with a wide range of hydraulic fluids, including mineral oils, synthetic oils, and biodegradable fluids, and can be used in both open‑loop and closed‑loop hydraulic systems.
Core Functionalities
LSHT (Low‑Speed High‑Torque) Performance – The motor delivers high torque at low rotational speeds, maintaining consistent output from its minimum stable speed up to 305 rpm continuous. The motor runs smoothly and constantly over the entire speed range, with high starting torque ensuring reliable startup even under full load.
Stepless Speed Control – As a fixed‑displacement motor, speed is infinitely variable and directly proportional to hydraulic flow rate, allowing precise and cost‑effective speed control with a simple flow control valve.
Bi‑Directional Operation – The motor is fully reversible. Rotational direction is controlled simply by reversing the hydraulic flow, supporting forward‑reverse cycling without additional mechanical reversing components.
High Efficiency – Minimal hydraulic and mechanical losses result in high efficiency even at high pressures. This reduces energy consumption, heat generation, and overall system operating costs.
High Radial and Axial Load Absorption – Tapered roller bearings enable the motor to handle significant static and dynamic radial loads, allowing direct mounting to wheels or sprockets without external bearings.
Overrunning Protection – Integrated check valves provide protection against cavitation and cross‑port leakage during overrunning or freewheeling load conditions, ensuring safe operation in applications where the load may drive the motor faster than the supplied flow.
IP65 Protection Rating – This variant offers an IP65 waterproof rating, ensuring reliable operation in dusty, wet, or high‑moisture environments.
Application Sectors
The Danfoss OMT400T 151B3057 is widely used across various industrial and mobile hydraulic applications requiring high torque, reliability, and low‑speed operation.
Construction Equipment – Excavators, loaders, skid steer loaders, backhoe loaders, trenchers, road rollers, compactors, asphalt pavers (auger and conveyor systems), and concrete mixers.
Agricultural Machinery – Combine harvesters (feeder houses, augers), forage harvesters, round and square balers (bale chamber mechanisms), self‑propelled sprayers, sugar cane harvesters, and other heavy agricultural equipment.
Material Handling and Lifting Equipment – Forklifts (lifting and tilting functions), pallet stackers, industrial winches, heavy‑duty conveyor systems, and aerial work platforms (scissor lifts, boom lifts).
Forestry Equipment – Wood chippers, brush cutters, stump grinders, log splitters, forestry harvesters, and winches requiring high torque in rugged outdoor environments.
Lawn and Turf Equipment – Large‑area mowers, turf maintenance machinery, and professional landscaping equipment.
Industrial and Stationary Equipment – Industrial mixers and agitators, packaging machinery (wrapping, sealing, palletizing), machine tools (indexing tables, rotary workstations), test rigs, and injection molding machines.
Municipal and Environmental Equipment – Street sweepers (main broom, gutter broom), snow blowers (auger, impeller drives), and refuse collection vehicles (compactor mechanisms).
Marine and Offshore – Deck machinery (capstans, mooring winches, windlasses), steering gear, and fishing equipment (net drums, line haulers).
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss (formerly Sauer‑Danfoss) |
| Series | OMT (Orbital Motor Series – Medium to Heavy‑Duty LSHT) |
| Model Code / Part Number | OMT400T 151B3057 |
| Motor Type | Fixed‑displacement, bi‑directional Geroler LSHT orbital motor |
| Displacement | 400 cm³/rev |
| Rotation | Bi‑directional (reversible) |
| Maximum Continuous Speed | 305 rpm |
| Maximum Intermittent Speed | 365 rpm |
| Minimum Stable Speed | ~15 rpm (load‑dependent) |
| Maximum Continuous Torque | 1080 Nm |
| Maximum Intermittent Torque | 1260 Nm |
| Maximum Continuous Pressure | 200 bar (2,900 psi) |
| Maximum Intermittent Pressure | 240 bar (3,480 psi) |
| Maximum Continuous Flow | 125 L/min |
| Maximum Intermittent Flow | 150 L/min |
| Shaft Type | Straight shaft, 40 mm diameter, 12 mm width |
| Flange Type | Special flange with tacho connection |
| Main Port Thread | G 3/4 BSP (side ports) |
| Drain Port | G 1/4 BSP |
| Housing Material | Cast iron |
| Finish | Black |
| Net Weight | Approx. 23.0 kg |
| Dimensions | Length: 259 mm, Width: 160 mm, Height: 170 mm |
| Operating Temperature Range | –20°C to +80°C |
| Protection Rating | IP65 (waterproof) |
| Circuit Compatibility | Open‑loop and closed‑loop systems |
| Special Features | Disc valve distribution, tapered roller bearings, high‑pressure shaft seal (HPS), integrated check valves, IP65 waterproof rating, special tacho‑ready flange |
Conclusion
The Danfoss OMT400T 151B3057 is a robust, efficient, and highly versatile medium to heavy‑duty orbital hydraulic motor from the OMT series. With its 400 cm³ displacement, 1080 Nm continuous torque output, 305 rpm continuous speed capability, 15 rpm minimum stable speed, and 125 L/min flow rating, 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 valve distribution for high efficiency and long life, high pressure capability (200 bar continuous, 240 bar intermittent), high back‑pressure tolerance enabling series or parallel circuit use without a separate drain line, tapered roller bearings for exceptional radial load capacity, integrated check valves for overrunning protection, IP65 waterproof rating, a straight 40 mm output shaft, and a special tacho‑ready flange for precise speed monitoring. The rugged cast iron housing (23.0 kg) and G 3/4 BSP side ports ensure easy integration into a wide range of hydraulic systems.
These attributes make the OMT400T 151B3057 an excellent, energy‑efficient solution for a wide range of medium to heavy‑duty mobile and stationary equipment, including construction machinery, agricultural equipment, material handling systems, forestry machinery, industrial equipment, municipal equipment, and marine deck machinery.
As a proven, reliable, and energy‑efficient solution for LSHT applications, the Danfoss OMT400T 151B3057 delivers consistent high torque, smooth low‑speed operation, reversible capability, high radial load capacity, waterproof durability, 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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