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Danfoss OMS315 151F0513 Hydraulic Orbital Motor
Overview
The Danfoss OMS315 151F0513 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.
Originally manufactured by White Drive Products (now part of Danfoss), the OMS315 151F0513 is recognized for its high load capacity, robust cardan design, and long service life. The OMS series is specifically designed for continuous operation under rough conditions, including high pressure, thin oil, or frequent reversals. With pressure capability up to 275 bar (3,990 psi), these motors cover small to large, medium to heavy‑duty applications, delivering premium power while fulfilling the latest emissions standards.
Technical Features
Gerotor (Orbital) Gear Set Design — The motor employs a proven gerotor gear set, delivering high torque at low rotational speeds with smooth, reliable performance. It is suitable for continuous operation under rough conditions such as high pressure, thin oil, or frequent reversals. Advanced disc distribution flow technology ensures high efficiency and consistent output across a wide range of operating conditions.
Large Fixed Displacement — The OMS315 has a displacement of approximately 315 cm³ (314.9 cm³, 19.22 in³) per revolution. As a fixed‑displacement motor, output torque is determined by system pressure, while speed is directly proportional to input flow, allowing easy stepless speed regulation with a flow control valve. The OMS series covers displacements from 80 cm³ to 500 cm³.
High Pressure Capability — The motor operates with a maximum continuous pressure drop of 200 bar (2,900 psi), an intermittent pressure drop of 240 bar (3,480 psi), and a peak pressure drop of 260 bar (3,770 psi). It is designed for high‑pressure, heavy‑duty industrial drive requirements. The O‑series has a pressure capability up to 275 bar (3,990 psi).
High Torque Output — Maximum continuous torque is 825 Nm (7,300 lbf‑in), and maximum intermittent torque is 1,000 Nm (8,850 lbf‑in). This high torque density makes the motor ideal for demanding applications that require powerful, slow rotation without additional gear reduction.
Speed and Flow Ratings — Maximum continuous speed is 240 rpm, maximum intermittent speed is 285 rpm, and minimum stable speed is as low as 15–20 rpm, enabling precise motion control. Maximum continuous flow is 75 L/min (19.8 gpm) and intermittent flow is 90 L/min (23.8 gpm).
Disc Distribution Flow System with Separately Driven Disc Valve — The motor incorporates an advanced disc valve distribution system with a separately driven, hydraulically balanced disc valve. This minimizes hydraulic and mechanical losses, giving high efficiency even at high pressures and good starting characteristics. It also provides automatic compensation during operation, resulting in high volumetric efficiency and long service life.
Tapered Roller Bearings — The output shaft is supported by tapered roller bearings, making the motor suitable for absorbing both static and dynamic radial loads. This high radial load capacity allows direct mounting to drive wheels, drums, or sprockets without external bearings in many applications.
High Back‑Pressure Tolerance — A high‑pressure shaft seal design allows the motor to withstand significant back pressure without requiring a separate case drain line in many applications, simplifying hydraulic circuit design and enabling series or parallel configurations.
Splined Output Shaft — The motor is equipped with a 1.25‑inch splined 14T output shaft (ANSI B92.1‑1970). Port size is G 1/2 BSP, and the drain port is also G 1/2 BSP.
Compact and Robust Construction — The cast iron housing weighs approximately 12.3 kg (27.1 lbs). Packing size is 40 x 17 x 16 cm. Dimensions are Lmax 221 mm (8.70 in), L1 54.8 mm (2.157 in), L2 177 mm (6.97 in).
Wide Operating Temperature and Fluid Compatibility — Operating temperature range is –20°C to +80°C. The motor uses hydraulic oil and is compatible with mineral oils, synthetic oils, and biodegradable fluids.
Robust Cardan Design — The robust cardan shaft ensures longer life in demanding applications, improving overall stability and reducing maintenance costs.
Low Leakage Design — A low‑leakage version contributes to energy savings, ensuring high volumetric efficiency and consistent output speeds.
Dust Seal Cap — A dust seal cap provides resistance to high dust concentrations, ensuring reliable operation in dusty environments.
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 (approx. 15–20 rpm) up to its maximum continuous speed of 240 rpm.
Stepless Speed Control — Output speed is infinitely variable and directly proportional to hydraulic flow, allowing precise, cost‑effective speed control with a flow control valve, eliminating complex mechanical transmissions.
High Starting Torque — The motor provides high starting torque, ensuring smooth startup even under full load and high breakaway loads.
Constant Torque Across Speed Range — The motor runs smoothly over its entire speed range and maintains constant torque regardless of speed fluctuations.
Bi‑Directional Operation — Fully reversible: direction is controlled by reversing hydraulic flow, supporting forward‑reverse cycling without mechanical reversing mechanisms.
High Radial Load Absorption — Tapered roller bearings allow direct mounting to drive wheels, drums, or sprockets without external bearings, simplifying machine design and reducing cost.
High Back‑Pressure Tolerance — High‑pressure shaft seal design enables operation without a separate drain line in most applications, simplifying circuit design and allowing series/parallel installation.
Energy‑Efficient Operation — High mechanical and volumetric efficiency minimizes energy loss, reduces heat generation and system power consumption, and lowers operating costs.
Smooth and Vibration‑Free Operation — The motor runs smoothly at low speeds with minimal noise and vibration, enhancing operator comfort and reducing mechanical stress. For very smooth low‑speed running, the OMS (and OMT, OMV, TMT) series are recommended.
High Reliability and Durability — Danfoss hydraulic motors are renowned for high reliability. The internal structure is optimized for long‑term high‑load operation, using high‑quality materials and advanced manufacturing processes.
Precise Control — The motor enables precise speed and torque control to meet different operating conditions, improving overall system efficiency and reducing energy loss.
Application Sectors
The Danfoss OMS315 151F0513 is ideal for a broad range of medium to heavy‑duty applications requiring high torque at low speeds, smooth operation, and durable construction. It is well suited for both open and closed‑loop hydraulic systems in work and propel functions.
Agriculture Industry — Combine harvesters (feeder houses, augers), round and square balers (bale chamber, compression, net wrapping), forage harvesters (cutting, chopping, feed rollers, spouts), fertilizer/manure spreaders, self‑propelled sprayers, sugar cane harvesters, heavy tractors, and three‑point hitch attachments.
Construction Equipment — Skid steer loaders and compact track loaders (auxiliary circuits for augers, planers, brooms), mini excavators, backhoe loaders, trenchers (cutting chain, augers), road sweepers (main broom, side brush), concrete mixers, road rollers, compactors, and large excavators/loaders (travel and slewing mechanisms).
Material Handling and Lifting Equipment — Forklifts (lifting, tilting), pallet stackers, walkie stackers, industrial conveyors (belt, chain, roller), industrial winches, aerial work platforms (scissor lifts, boom lifts – articulation, leveling, drive), and cranes.
Forestry Equipment — Wood chippers (chipper drum/disc), brush cutters, mulchers, stump grinders, log splitters, forestry harvesters/forwarders (feed rollers, delimbing knives, drive systems).
Lawn and Turf Equipment — Large‑area mowers, greens mowers, turf maintenance machinery, professional landscaping equipment (cutting decks, traction systems).
Industrial and Stationary Equipment — Industrial mixers and agitators (high‑viscosity processing), packaging machinery (wrapping, sealing, palletizing), machine tools (indexing tables, rotary workstations, tool changers), test rigs, injection molding machines (auxiliary functions), heavy industrial automation, and general processing equipment.
Municipal and Environmental Equipment — Full‑size street sweepers (main broom, gutter broom), snow blowers (auger, impeller), refuse collection vehicles (compactor, packing mechanisms), and municipal cleaning/maintenance vehicles. Also used in highway maintenance equipment.
Road Building Equipment — Small asphalt pavers (auger, conveyor), road maintenance equipment, compactors.
Marine and Offshore — Deck machinery (capstans, mooring winches, windlasses), steering gear (auxiliary steering on small to medium vessels), fishing equipment (net drums, line haulers, pot haulers).
Mining (Light Duty) — Conveyor drives and material handling systems in processing plants.
Special‑Purpose Industrial Machinery — Custom automation and processing equipment requiring high‑torque, low‑speed rotary actuation, including aerial work platforms and skid loaders.
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss (formerly White Drive Products / Sauer‑Danfoss) |
| Series | OMS (Orbital Motor Series – Medium to Heavy‑Duty LSHT) |
| Model Code / Part Number | OMS315 151F0513 (also 151F‑0513, OMS315‑151F‑0513, OMS315151F0513) |
| Motor Type | Fixed‑displacement, bi‑directional gerotor (orbital) LSHT motor |
| Displacement | approx. 315 cm³ (314.9 cm³, 19.22 in³) per rev |
| Rotation | Bi‑directional |
| Maximum Continuous Speed | 240 rpm |
| Maximum Intermittent Speed | 285 rpm |
| Minimum Stable Speed | ≈15–20 rpm (load‑dependent) |
| Maximum Continuous Torque | 825 Nm (7,300 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 | 240 bar (3,480 psi) |
| Maximum Peak Pressure Drop | 260 bar (3,770 psi) |
| Maximum Series Pressure Capability | up to 275 bar (3,990 psi) |
| Maximum Continuous Inlet Pressure | 200 bar (2,900 psi) |
| Maximum Continuous Flow | 75 L/min (19.8 gpm) |
| Maximum Intermittent Flow | 90 L/min (23.8 gpm) |
| Maximum Output Power | up to 15 kW (depending on conditions) |
| Shaft Type | 1.25″ splined 14T (ANSI B92.1‑1970) |
| Port Size | G 1/2 BSP |
| Drain Port | G 1/2 BSP |
| Mounting | Flange mounting |
| Housing Material | Cast iron |
| Finish | Casting color |
| Weight | 12.3 kg (27.1 lbs) |
| Packing Size | 40 × 17 × 16 cm |
| Dimensions | Lmax 221 mm, L1 54.8 mm, L2 177 mm |
| Ambient Operating Temperature | –20°C to +80°C |
| Hydraulic Fluids | Mineral oils, synthetic oils, biodegradable fluids |
| Circuit Compatibility | Open‑loop and closed‑loop; suitable for series and parallel setups |
| Special Features | Disc flow distribution with separate disc valve, tapered roller bearings, high‑pressure shaft seal, robust cardan design, low leakage design, dust seal cap, high load capacity, long service life |
| Country of Origin | Denmark (Germany, Poland also referenced) |
Conclusion
The Danfoss OMS315 151F0513 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 (1,000 Nm intermittent), 240 rpm continuous speed, and minimum stable speed as low as 15–20 rpm, it is exceptionally well suited for demanding applications requiring powerful, controlled low‑speed rotation without additional gear reduction.
Its defining features include a gerotor gear set with high starting torque and constant torque across a wide speed range, high pressure capability (200 bar continuous, 260 bar peak), disc distribution flow with a separately driven, hydraulically balanced disc valve for high efficiency, tapered roller bearings for excellent radial load capacity, high back‑pressure tolerance enabling no separate drain line in many applications, low internal leakage for high volumetric efficiency, a rugged cast iron housing (12.3 kg), and a splined output shaft. Additional strengths are the robust cardan design, dust seal cap, and long service life supported by high‑quality materials and advanced manufacturing.
These attributes make the OMS315 151F0513 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), marine deck machinery, and road building equipment.
As a proven, reliable, and energy‑efficient solution for LSHT applications, the Danfoss OMS315 151F0513 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 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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