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Danfoss OMS315 151F0506 Hydraulic Orbital Motor
Overview
The Danfoss OMS315 151F0506 is a fixed-displacement, low-speed high-torque (LSHT) hydraulic orbital motor from Danfoss‘s OMS series. Engineered for medium to heavy-duty applications, this gerotor-type motor efficiently converts hydraulic pressure and flow into powerful, reliable rotary mechanical power across a wide range of demanding mobile and industrial environments. The OMS series is specifically designed for continuous operation under rough conditions, such as high pressure, thin oil, or frequent reversals, while maintaining high performance and long service life. This motor is widely recognized for its compact construction, high torque density, smooth low-speed operation, and consistent performance under challenging operating conditions.
Technical Features
Fixed-Displacement Gerotor (Orbital) Design — The OMS315 employs a proven fixed-displacement gerotor gear set, delivering high torque at low rotational speeds with smooth, reliable performance. The OMS series is suitable for continuous operation under rough operating conditions, including high pressure, thin oil, or frequent reversals. This motor utilizes advanced Gerotor gear set technology with disc distribution flow, ensuring high efficiency and consistent output across a wide range of operating conditions.
Large Displacement — The OMS315 has a displacement of 315 cm³/rev (314.9 cm³ to 315.5 cm³ depending on source). The OMS series covers a displacement range from 80 cm³ to 500 cm³, and this 315 cm³ model sits in the upper mid-range, providing substantial fluid volume per revolution for high torque output without the need for additional gear reduction.
Pressure and Torque Capabilities — The motor operates with a maximum continuous pressure drop of 200 bar, a maximum intermittent pressure drop of 250 bar, and a maximum continuous inlet pressure rating of 210 bar. In terms of torque output, the OMS315 delivers a maximum continuous torque of 825 Nm (7,301 lbf-in) and a maximum intermittent torque of 1,000 Nm (8,850 lbf-in), with some sources indicating a maximum continuous torque of 865 Nm depending on configuration. This high torque density in a compact package makes it ideally suited for demanding applications that require powerful, slow rotation without additional gear reduction.
Speed and Flow Ratings — The OMS315 has a maximum continuous speed of 240 rpm and a maximum intermittent speed of 285–300 rpm (depending on source), with a minimum stable speed as low as 15–20 rpm, enabling precise motion control and positioning. The maximum continuous flow rate is 75 L/min, with a maximum intermittent flow rate of 90 L/min. The motor delivers a maximum continuous power output of 15.0 kW.
Disc Distribution Flow System — The motor incorporates an advanced disc valve distribution system with a separately driven, hydraulically balanced disc valve. This advanced design minimizes hydraulic and mechanical losses, giving the motor high efficiency even at high pressures and good starting characteristics. Additionally, the disc distribution flow system provides automatic compensation during operation, resulting in high volumetric efficiency and long service life while delivering smooth and reliable operation.
Tapered Roller Bearings for High Load Capacity — The OMS315 features tapered roller bearings supporting the output shaft, which permit high axial and radial forces. This robust bearing system makes the motors suitable for absorbing both static and dynamic radial loads, allowing the motor to be directly coupled to its driven load without the need for external bearings in many applications.
High-Pressure Shaft Seal (HPS) and Check Valves — The motor is equipped with a high-pressure shaft seal design that allows it to withstand significant back pressure without requiring a separate case drain line in many applications. This simplifies hydraulic circuit design, reduces component count, and enables the motor to be installed in series or parallel configurations. The motor also includes integrated check valves, which provide protection against cavitation and cross-port leakage during overrunning or freewheeling load conditions. The shaft seal design features low starting pressure and an ability to withstand significant back pressure.
Low Internal Leakage — The OMS315 is engineered with precision manufacturing that results in low internal leakage, ensuring high volumetric efficiency and consistent output speeds across varying pressure conditions.
Bi-Directional Operation — The OMS315 is a fully reversible (bi-directional) motor. Rotational direction is simply controlled by reversing the hydraulic flow, providing flexible system design for forward-reverse cycling without the need for complex mechanical reversing mechanisms.
Standardized Mounting and Shaft Configuration — The motor features a 32 mm diameter cylindrical output shaft with a parallel key (A10 x 8 x 45 mm, DIN 6885) and a standard square 4-hole SAE A mounting flange (4 x Ø13.5 mm on Ø106.4 mm PCD, 82.55 mm pilot diameter). The main ports are side-ported with G 1/2 BSPP threads, and the drain port is G 1/4 BSPP.
Compact and Robust Construction — The OMS315 is built with a robust cast iron housing, weighing approximately 12.3–12.7 kg, and has overall dimensions of approximately 400 mm (length) × 160 mm (width) × 170 mm (height), with a packing size of 40 × 17 × 16 cm. The unit length is 208 mm (other sources indicate L = 208 mm, L1 = 54.8 mm, L2 = 165 mm, L3 = 67 mm).
Wide Operating Temperature — The motor operates reliably across a wide temperature range of -20°C to +80°C (-4°F to +176°F) and can accommodate oil temperatures up to 80–90°C under normal conditions, supporting use in both cold outdoor and hot industrial environments.
Low Noise Operation — The OMS315 is designed for quiet operation, which is a vital feature for applications where noise reduction is a primary concern.
Fluid Versatility — The motor is compatible with a wide range of hydraulic fluids, including mineral oils, synthetic oils, and biodegradable fluids. The recommended oil viscosity range is 20–75 cSt. The motor operates effectively in both open-loop and closed-loop hydraulic systems and can be used in series or parallel circuit configurations.
High Efficiency — The OMS motor series is meticulously engineered for exceptional overall efficiency, proficiently converting a substantial portion of input hydraulic energy into mechanical work, thereby curbing energy consumption and operating expenditures.
Low Starting Pressure and High Starting Torque — The motor features low starting pressure, which contributes to its high starting torque characteristics. The OMS series delivers robust starting torque, making it especially advantageous for applications that necessitate surmounting initial resistance or handling substantial loads at startup.
Core Functionalities
LSHT (Low-Speed, High-Torque) Performance — The OMS315 is specifically optimized for LSHT operation. Its gerotor design provides high torque at low rotational speeds, maintaining consistent output from its minimum stable speed (approximately 15–20 rpm) up to its maximum continuous speed of 240 rpm. This LSHT capability eliminates the need for additional gear reduction in many applications.
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 flow control valve, eliminating the need for complex mechanical transmissions.
High Starting Torque — The OMS315 provides high starting torque, ensuring smooth, reliable startup from a standstill, even when the motor must start under full load and overcome high breakaway loads. The motor also exhibits strong short-term overload capacity, allowing it to withstand peak torque demands for brief periods without damage.
Constant Torque Across Speed Range — The motor runs smoothly over its entire speed range and maintains a constant torque output regardless of speed fluctuations, ensuring consistent, predictable performance and load handling.
Bi-Directional Drive — Full reversible capability allows the motor to change rotational direction instantly by reversing the flow, supporting forward-reverse cycling applications such as winches, augers, and sweeper brushes without additional mechanical reversing components.
High Back-Pressure Tolerance — The high-pressure shaft seal (HPS) enables the motor to tolerate significant return line back pressure without requiring a separate drain line. This simplifies hydraulic system design, reduces component count, and allows installation in series or parallel circuit configurations. The motor can be used in both parallel and series hydraulic system setups.
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 (e.g., winches, hydrostatic drives).
High Radial Load Absorption — Tapered roller bearings give the OMS315 a high radial load capacity, allowing it to be directly mounted to drive wheels, drums, or sprockets without external bearings. This simplifies machine design and reduces cost.
Energy-Efficient Operation — High mechanical and volumetric efficiency minimizes energy loss, converts maximum hydraulic energy into useful mechanical power, reduces heat generation and system power consumption, and contributes to lower operating costs.
Smooth and Vibration-Free Operation — The OMS315 runs smoothly at low speeds with minimal noise and vibration, enhancing operator comfort and reducing mechanical stress on associated equipment. Smooth operation at low speeds is particularly beneficial for precision applications, and the OMS, OMT, and OMV series are recommended for applications requiring very smooth running at low speeds.
Long Service Life and Low Maintenance — Robust cast iron construction, high-quality materials, wear-resistant gerotor gear set, tapered roller bearings, and advanced sealing system minimize wear and extend service intervals. Proper fluid maintenance (regular oil and filter changes) ensures long-term operational stability with minimal downtime.
Application Sectors
The Danfoss OMS315 151F0506 is a versatile and robust hydraulic orbital motor, ideal for a broad spectrum of medium to heavy-duty applications requiring high torque at low speeds, smooth operation, and compact, durable construction. It is well suited for both open and closed-loop hydraulic systems in work and propel functions. The OMS series, known for its dependable performance and adaptability, finds utility across a wide array of applications, including agriculture, construction machinery, material handling equipment, industrial machinery, and beyond.
Agricultural Machinery — Combine harvesters (driving feeder houses, augers, and harvesting mechanisms), round and square balers (driving bale chamber mechanisms, compression systems, and net wrapping), forage harvesters (powering cutting and chopping mechanisms, feed rollers, and spouts), fertilizer and manure spreaders (driving spreading mechanisms at controlled speeds), self-propelled sprayers (powering hydraulic drive systems), sugar cane harvesters, heavy tractors, and three-point hitch attachments. Agricultural equipment applications require high torque and reliability in demanding outdoor operating conditions.
Construction Equipment — Skid steer loaders and compact track loaders (driving auxiliary hydraulic circuits for attachments such as augers, planers, brooms), mini excavators (powering auxiliary attachments and rotation systems), backhoe loaders (powering implement circuits and attachment rotation), trenchers (driving cutting chain mechanisms and augers), road sweepers (driving main broom and side brush mechanisms), concrete mixers (driving mixing drum rotation), road rollers, compactors, and large excavators and loaders (providing strong power and high torque output for travel and slewing mechanisms). The OMS315 is used in heavy-duty construction machinery where compact packaging, robust construction, and moderate torque-to-weight ratio are critical for demanding job site conditions.
Material Handling and Lifting Equipment — Forklifts (driving hydraulic systems for lifting and tilting loads), pallet stackers and walkie stackers (powering lifting and positioning mechanisms), industrial conveyors (driving belt, chain, or roller conveyors for bulk material handling and logistics), industrial winches (providing controlled pulling and lifting power), aerial work platforms (scissor lifts and boom lifts for boom articulation, platform leveling, and drive systems), and cranes for hoisting operations.
Forestry Equipment — Wood chippers (driving the chipper drum or disc at controlled speeds), brush cutters and mulchers (powering cutting heads and mulching mechanisms for land clearing), stump grinders (driving grinding wheels for stump removal), log splitters (powering splitting wedges for log processing), and forestry harvesters/forwarders (powering feed rollers, delimbing knives, and drive systems). The high torque and low-speed operation characteristics of the OMS315 enable it to play an important role in heavy-duty forestry operations.
Industrial and Stationary Equipment — Industrial mixers and agitators (powering mixing paddles for high-viscosity material processing in chemical and food industries), packaging machinery (powering wrapping, sealing, and palletizing systems), machine tools (driving indexing tables, rotary workstations, and tool changers), test rigs (providing controlled rotational power for component and system testing), injection molding machines (driving auxiliary functions), heavy industrial automation equipment, and general processing equipment.
Municipal and Environmental Equipment — Full-size street sweepers (driving main broom and gutter broom mechanisms for municipal street cleaning), snow blowers (powering auger and impeller systems for snow removal), refuse collection vehicles (driving compactor and packing mechanisms), and general municipal cleaning and maintenance vehicles.
Lawn and Turf Equipment — Large-area mowers, greens mowers, turf maintenance machinery, and professional landscaping equipment requiring reliable, low-speed, high-torque hydraulic drive for cutting decks and traction systems.
Marine and Offshore — Deck machinery (powering capstans, mooring winches, and windlasses), steering gear (powering auxiliary steering systems on small to medium vessels), and fishing equipment (driving net drums, line haulers, and pot haulers).
Mining (Light Duty) — Conveyor drives and material handling systems in processing plants.
Road Building and Construction — Small asphalt pavers (auger and conveyor systems), road maintenance equipment, and compactors.
Special-Purpose Industrial Machinery — Custom industrial automation and processing equipment requiring high-torque, low-speed rotary actuation and reliable performance in challenging environments.
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss (formerly Sauer-Danfoss / White Drive Products) |
| Series | OMS (Orbital Motor Series – Medium to Heavy-Duty LSHT) |
| Model Code / Part Number | OMS315 151F0506 (also seen as OMS315‑151F‑0506, OMS315151F0506, 151F-0506, 151F0506) |
| Motor Type | Fixed-displacement, bi-directional gerotor (orbital) LSHT motor |
| Displacement (Geometric) | 315 cm³/rev (314.9 cm³ to 315.5 cm³, depending on source) |
| Rotation | Bi-directional (reversible) |
| Maximum Continuous Speed | 240 rpm |
| Maximum Intermittent Speed | 285–300 rpm (depending on source) |
| Minimum Stable Speed | ≈15–20 rpm (load-dependent) |
| Maximum Continuous Torque | 825 Nm (7,301 lbf-in) |
| Maximum Intermittent Torque | 1,000 Nm (8,850 lbf-in) |
| Maximum Continuous Pressure Drop | 200 bar (2,900 psi) |
| Maximum Intermittent Pressure Drop | 250 bar (3,625 psi) |
| Maximum Continuous Inlet Pressure | 210 bar (3,045 psi) |
| Maximum Continuous Flow | 75 L/min (19.8 gpm) |
| Maximum Intermittent Flow | 90 L/min (23.8 gpm) |
| Maximum Continuous Output Power | 15.0 kW |
| Shaft Type | 32 mm diameter cylindrical shaft |
| Shaft Key | A10 × 8 × 45 mm (DIN 6885) – parallel key |
| Mounting Flange | Standard square 4‑hole SAE A flange (4 × Ø13.5 mm on Ø106.4 mm PCD, 82.55 mm pilot diameter) |
| Main Port Thread | G 1/2 (BSPP) – side port configuration |
| Drain Port Thread | G 1/4 (BSPP) |
| Housing Material | Cast iron |
| Finish / Color | Black (RAL 9005) |
| Weight | 12.3–12.7 kg (approx. 27.1–28.0 lbs) |
| Dimensions (L × W × H) | Approx. 400 mm × 160 mm × 170 mm |
| Unit Length (L) | 208 mm |
| L1 Dimension | 54.8 mm |
| L2 Dimension | 165 mm |
| L3 Dimension | 67 mm |
| Ambient Operating Temperature | -20°C to +80°C (-4°F to +176°F) |
| Oil Temperature Range | Up to 80–90°C (normal operating conditions) |
| Recommended Hydraulic Fluid | Mineral oils (e.g., ISO VG 68), synthetic oils, biodegradable fluids |
| Recommended Oil Viscosity | 20–75 cSt |
| Circuit Compatibility | Open-loop and closed-loop systems; suitable for series and parallel setups |
| Special Features | Disc distribution flow with separately driven, hydraulically balanced disc valve; tapered roller bearings (output shaft); high-pressure shaft seal (HPS); integrated check valves; low internal leakage; low starting pressure; high starting torque; constant torque across speed range; smooth low-speed operation; bidirectional capability; robust cast iron construction; low noise operation |
| Barcode / GTIN | 5704295495828 |
| Country of Origin | Poland |
| Intrastat Code | 84122981 |
Conclusion
The Danfoss OMS315 151F0506 is a robust, efficient, and highly versatile medium to heavy-duty orbital hydraulic motor that embodies Danfoss‘s industry-leading LSHT gerotor technology. With its 315 cm³ displacement, 825 Nm continuous torque output (1,000 Nm intermittent), 240 rpm continuous speed capability, and minimum stable speed as low as 15–20 rpm, it is exceptionally well suited for a wide range of demanding applications that require powerful, controlled low-speed rotation without additional gear reduction.
Its defining features include a gerotor gear set providing high starting torque and constant torque output across a wide speed range, high pressure capability (200 bar continuous pressure drop with 210 bar inlet pressure, 250 bar intermittent), disc distribution flow with a separately driven, hydraulically balanced disc valve for high efficiency, tapered roller bearings for exceptional radial load capacity, high back-pressure tolerance enabling use without a separate drain line (HPS design), integrated check valves for overrunning protection, low internal leakage for high volumetric efficiency, and a rugged cast iron housing weighing approximately 12.3–12.7 kg.
These attributes make the OMS315 151F0506 an excellent, energy-efficient solution for agricultural machinery (harvesters, balers, forage harvesters, spreaders, sprayers), construction equipment (skid steer loaders, mini excavators, trenchers, sweepers, rollers), material handling systems (forklifts, aerial lifts, conveyor drives, winches), forestry equipment (chippers, stump grinders, brush cutters, log splitters), industrial equipment (mixers, packaging machinery, machine tools, injection molding machines), municipal equipment (street sweepers, snow blowers, refuse vehicles), and marine deck machinery.
As a proven, reliable, and energy-efficient solution for LSHT applications, the Danfoss OMS315 151F0506 delivers consistent torque, smooth and stable operation at both low and high speeds, reversible capability, high radial load capacity, and long-term dependability for machinery worldwide. The OMS series is suitable for continuous operation under rough operating conditions, including high pressure, thin oil, or frequent reversals, making this motor a trusted choice for engineers and system integrators across agricultural, construction, material handling, forestry, industrial, municipal, and marine sectors.
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