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Danfoss OMT500T 151B3062 Hydraulic Orbital Motor
Overview
The Danfoss OMT500T 151B3062 is a fixed-displacement, low-speed high-torque (LSHT) orbital hydraulic motor from Danfoss‘s OMT series. As a ”T“ variant within the OMT500 lineup, this model is configured with a straight output shaft and a special flange equipped with a tachometer (tacho) connection, making it particularly suitable for applications requiring precise speed monitoring and feedback control.
The OMT series occupies a critical position between the OMS and OMV families within Danfoss’s orbital motor portfolio. With displacements spanning from 161 cm³ to 629 cm³ (the OMT500 sits in the upper range) and pressure ratings up to 275 bar [3,990 psi], it delivers high torque for a wide variety of medium- to heavy-duty applications operating under extreme conditions. The ”T“ designation indicates the ”tacho-ready“ configuration, which distinguishes this motor from standard OMT500 models.
Technical Features
Geroler Orbital Design with Disc Valve Distribution — The motor utilizes an advanced Geroler (orbital) gear set featuring 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 minimize hydraulic and mechanical losses. This design automatically compensates for wear, resulting in high volumetric and mechanical efficiency, long service life, smooth operation, and excellent starting characteristics even at high pressures.
Large Fixed Displacement — The motor has a geometric displacement of 500 cm³ per revolution. As a fixed-displacement motor, output torque is directly proportional to system pressure, while rotational speed is directly proportional to input flow rate, enabling simple and precise stepless speed control using a standard flow control valve.
High Pressure & Torque Ratings — The motor operates with a maximum continuous pressure of 200 bar (2,900 psi) and a maximum intermittent pressure of 240 bar (3,480 psi). It delivers a maximum continuous torque of 1,080 Nm (9,560 lbf‑in) and a maximum intermittent torque of 1,260 Nm (11,150 lbf‑in). 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.
Speed and Flow Performance — The motor has a maximum continuous speed of 240 rpm and a maximum intermittent speed of 285 rpm. The maximum continuous flow rating is 125 L/min (33.0 gpm). The minimum stable speed is typically around 15 rpm, enabling precise motion control and positioning.
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. This ”tacho-ready“ design allows for direct integration of speed sensing equipment without additional machining or adapters.
Straight Output Shaft — The motor is equipped with a straight shaft of 40 mm diameter (with M12 tap). The shaft key configuration is A12 × 8 × 70 mm (DIN 6885). This robust shaft design provides excellent torque transmission and simple coupling to driven equipment.
Tapered Roller Bearings — The output shaft is supported by tapered roller bearings on both the front and rear ends. These high-capacity bearings can withstand high static and dynamic radial and axial loads, making the motor suitable for absorbing significant radial forces. This robust bearing system allows the motor to be directly coupled to wheels, drums, or sprockets without requiring external bearings.
Integrated Check Valves — The motor includes internal check valves that 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.
High Back Pressure Tolerance — Featuring a high‑pressure shaft seal (HPS), the motor can tolerate significant return line back pressure without requiring 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.
High Efficiency and Smooth Running — The advanced Geroler gear set with disc valve distribution minimizes hydraulic and mechanical losses, resulting in high efficiency even at high pressures. The motor provides smooth operation and constant operating torque over a wide speed range, with high starting torque ensuring reliable startup even under full load.
Standardized Porting and Connections — Main ports are side-ported G 3/4 BSP, and the drain port is G 1/4 BSP. The mounting flange is a 4‑bolt square type with pilot diameter 125 mm and bolt circle diameter 160 mm. The porting layout simplifies hose routing in tight installations and ensures compatibility with standard hydraulic fittings.
Dust Seal Protection — The motor includes a standard dust seal that provides resistance to high dust concentrations, ensuring reliable operation in dusty environments.
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 (e.g., ISO VG 68), 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 OMT500T is specifically optimized for LSHT operation. It delivers high torque at low rotational speeds, maintaining consistent output from its minimum stable speed (typically 15 rpm) up to its continuous speed of 240 rpm. The motor provides smooth operation at very low speeds, making it ideal for applications requiring precise slow-speed control.
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, eliminating the need for complex mechanical transmissions.
High Starting Torque — The Geroler gear set provides high starting torque, 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, 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 high radial and axial bearing capacity, allowing it to be directly mounted to drive wheels, drums, or sprockets without external bearings in many applications.
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.
Overrunning Protection — Integrated check valves protect the motor against cavitation and cross‑port leakage during overrunning or freewheeling load conditions, ensuring safe operation in winching, lowering, or other load-induced overrun scenarios.
Series and Parallel Circuit Compatibility — The high‑pressure shaft seal (HPS) enables the motor to tolerate high return line back pressure without a separate drain line, allowing installation in series or parallel hydraulic circuit configurations.
Smooth Low‑Speed Running — The OMT500T is specifically recommended for applications requiring very smooth running at low speeds, with stable and vibration‑free performance throughout the entire low-speed range.
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 OMT series is suitable for continuous operation under rough operating conditions, including high pressure, thin oil, or frequent reversals.
Application Sectors
The Danfoss OMT500T 151B3062 is a versatile and robust hydraulic orbital motor, ideal for a broad spectrum of medium to heavy-duty applications where high torque, reliability, smooth low-speed operation, and the ability to handle extreme conditions are required. The OMT series is widely used in construction, agriculture, material handling, forestry, industrial, and marine equipment.
Construction Equipment — Excavators (track drives and swing drives), skid steer loaders and compact track loaders (wheel motors), backhoe loaders (attachment and implement drives), trenchers (cutting chain mechanisms), road rollers and compactors (vibration systems and propel drives), asphalt pavers (auger and conveyor systems), concrete mixers (drum rotation drives), and mini excavators (auxiliary drives).
Agricultural Machinery — Combine harvesters (driving feeder houses, augers, tailings elevators, and reel drives), round and square balers (bale chamber mechanisms and compression systems), forage harvesters (cutting and chopping mechanisms, feed rollers, and spout rotation), self‑propelled sprayers (hydraulic drive systems), sugar cane harvesters (heavy‑duty feed rollers), and heavy tractors (auxiliary functions).
Material Handling and Lifting Equipment — Heavy‑duty forklifts (lifting, tilting, and auxiliary hydraulic functions), pallet stackers and walkie stackers (lifting and positioning mechanisms), industrial winches (controlled pulling and hoisting), heavy‑duty conveyor systems (belt, chain, and roller drives), aerial work platforms (scissor lifts and boom lifts — boom articulation and platform leveling), and cranes (hoisting and slewing drives).
Forestry Equipment — Wood chippers (chipper drum or disc drives), brush cutters and mulchers (cutting head drives), stump grinders (grinding wheel drives), log splitters (splitting wedge drives), forestry harvesters and forwarders (feed rollers, delimbing knives, and drive systems), and winches.
Lawn and Turf Equipment — Large‑area commercial mowers, greens mowers, turf maintenance machinery, and professional landscaping equipment requiring reliable, low‑speed, high‑torque hydraulic drives for cutting decks and traction systems.
Machine Tools and Stationary Equipment — Industrial mixers and agitators (high‑viscosity processing), machine tools (indexing tables, rotary workstations, and tool changers), packaging machinery (wrapping, sealing, and palletizing systems), test rigs (controlled rotational power for component testing), injection molding machines (auxiliary functions), and heavy industrial automation equipment.
Municipal and Environmental Equipment — Full‑size street sweepers (main broom and gutter broom mechanisms), snow blowers (auger and impeller drives), refuse collection vehicles (compactor mechanisms), and general municipal cleaning and maintenance vehicles.
Marine and Offshore — Deck machinery (capstans, mooring winches, windlasses), steering gear (auxiliary steering systems), and fishing equipment (net drums, line haulers, and pot haulers).
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss (formerly Sauer‑Danfoss) |
| Series | OMT (Orbital Motor Series – Medium to Heavy‑Duty LSHT) |
| Model Code / Part Number | OMT500T 151B3062 |
| Motor Type | Fixed‑displacement, bi‑directional Geroler LSHT orbital motor |
| Displacement | 500 cm³/rev |
| Rotation | Bi‑directional (reversible) |
| Maximum Continuous Speed | 240 rpm |
| Maximum Intermittent Speed | 285 rpm |
| Minimum Stable Speed | ~15 rpm (load‑dependent) |
| Maximum Continuous Torque | 1,080 Nm (9,560 lbf‑in) |
| Maximum Intermittent Torque | 1,260 Nm (11,150 lbf‑in) |
| Maximum Continuous Pressure | 200 bar (2,900 psi) |
| Maximum Intermittent Pressure | 240 bar (3,480 psi) |
| Maximum Continuous Flow | 125 L/min (33.0 gpm) |
| Maximum Intermittent Flow | 150 L/min (39.6 gpm) |
| Shaft Type | Straight shaft, 40 mm diameter (M12 tap) |
| Shaft Key | A12 × 8 × 70 mm (DIN 6885) |
| Mounting Flange | 4‑bolt 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 |
| Net Weight | Approx. 23 kg |
| Dimensions (L × W × H) | 259 mm × 160 mm × 170 mm |
| Operating Temperature Range | –20°C to +80°C |
| Protection | Dust seal (standard) |
| Circuit Compatibility | Open‑loop and closed‑loop systems; suitable for series and parallel setups |
| Special Features | Geroler gear set, disc valve distribution, tapered roller bearings (front and rear), integrated check valves, high‑pressure shaft seal (HPS), tacho‑ready flange, high starting torque, constant torque across speed range, smooth low‑speed operation |
Conclusion
The Danfoss OMT500T 151B3062 is a robust, efficient, and highly versatile medium to heavy-duty orbital hydraulic motor from Danfoss‘s OMT series. With its 500 cm³ displacement, 1,080 Nm continuous torque output, 240 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 on both the front and rear for exceptional radial and axial load capacity, integrated check valves for overrunning protection, a straight 40 mm output shaft, and a special tacho‑ready flange for precise speed monitoring. The rugged cast iron housing and G 3/4 BSP side ports ensure easy integration into a wide range of hydraulic systems.
These attributes make the OMT500T 151B3062 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 OMT500T 151B3062 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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