Danfoss OMRX Series Orbital Hydraulic Motor | OMRX50 OMRX160 17185537

The OMRX Series, OMSS Series, and OMVW Series low-speed, high-torque (LSHT) orbital hydraulic motors manufactured by Chengyuan Hydraulic are premium fluid power components engineered to match the rigorous global technical standards of Danfoss. This comprehensive suite of shaft and disc-distribution motors is optimized for medium to heavy-duty mobile traction and automated industrial rotational grids. Focused on the targeted displacement matrix and specialized catalog numbers provided—OMRX50 (Part Number 17185537), OMRX-160, OMRX-200, and OMRX-250—Chengyuan guarantees 100% original-place interchangeable plug-and-play compatibility. Every single motor is subjected to 100% simulated operational full-load testing and backpressure shock mapping before shipping, ensuring uncompromising volumetric stability and structural resilience under demanding cyclical loads.

Technical Specifications 

• Brand Cross-Reference: Danfoss Orbital Motor Compatible

• Core Product Series Matrix: OMRX Series (Fully compatible with OMSS Short-mount & OMVW Heavy-duty architectures)

• Target Designations: OMRX50 (17185537), OMRX-160, OMRX-200, OMRX-250

• Geometric Volumetric Displacement:

  • OMRX50: 51.7 $cm^3/rev$

  • OMRX-160: 159.7 $cm^3/rev$

  • OMRX-200: 198.2 $cm^3/rev$

  • OMRX-250: 247.1 $cm^3/rev$

• Continuous Rated Pressure Limits: 140 bar – 175 bar (Higher pressure handling capability for smaller sizes)

• Intermittent Peak Pressure Boundary: 175 bar – 225 bar

• Max. Continuous Output Torque: From 100 N·m (OMRX50) scaling up to 480 N·m (OMRX-250)

• Max. Continuous Rotational Speed: From 180 rpm (OMRX-250) up to 780 rpm (OMRX50)

• Continuous Power Output Capacity: 7 kW – 11 kW continuous rating

• Drive Shaft Interface Matrix: Standard $\phi 25$ / $\phi 32$ Cylindrical straight keyed shaft, or standard SAE 14-tooth involute spline

• Main Connection Port Profiles: G1/2 main working ports with an independent G1/4 case drain port configuration

Key Technical Advantages:

• Advanced Shaft-Distribution & Geroler Component Geometry: The OMRX internal gear profile incorporates precision-engineered hardened rollers within the stationary gear profile. Rolling contact reduces mechanical resistance at startup, pushing mechanical starting efficiency beyond 85% and eradicating low-speed “stiction” or crawling. The motor delivers uniform, continuous torque at speeds as low as 5-10 rpm.

• Reinforced Front Axle Radial Bearing Columns: The front shaft sector houses dual high-capacity tapered roller bearings (or heavy-duty journal sleeves depending on OMRX/OMVW frameworks). This bearing layout directly sustains intense radial and axial cross-forces exerted by direct wheel hubs, sprockets, or pulleys, safeguarding internal alignment.

• High-Pressure Backpressure Viton Shaft Seals: Fitted with a high-spec Fluorocarbon (Viton) main lip seal backed by integrated dual internal check valves. This robust arrangement permits the OMRX series to effortlessly absorb intermittent return line backpressure spikes up to 150 bar without seal deformation or external fluid leakage.

• Monoblock Cast Iron Housing with Nitrided Drive Links: The main enclosure is engineered from premium QT600-3 ductile iron castings to withstand sudden pressure spikes without micro-fracturing. The internal drive link features induction-hardened, precision-ground splines that minimize backlash and provide long fatigue life over millions of reversal cycles.

Application Areas:

• Agricultural & Forestry Machinery: Reel drives for combine harvesters, automated grain conveyor systems, heavy-duty rotary lawn mowers, and harvester grapple rotators.

• Municipal & Environmental Systems: Brush rotation circuits for street sweepers, fertilizer spreader spinners, and swing mechanisms for mini-excavators.

• Industrial Material Handling & Conveying: Compact hydraulic winch drums, assembly line traction feeds, and specialized hoist drives.

Expert Maintenance Tips:

• An Independent, Unrestricted Case Drain Line is Mandatory for High-Stress Duty: While internal check valves are included, you must run a dedicated drain hose from the rear G1/4 case drain port back to the reservoir below the oil level during continuous high pressure or frequent bidirectional rotation. Allowing case pressure to build beyond 20 bar will cause rapid shaft seal blowout and external fluid leakage.

• Execute Pre-Fill and Air Purging Prior to Initial Loaded Commisisoning: Brand new or recently serviced motors face immediate risk of dry friction damage. Before running under system load, completely fill the motor housing with clean hydraulic oil through the highest case drain port and turn the shaft manually 2-3 times. During initial startup, slightly loosen the case drain fitting to bleed trapped air until a solid column of fluid appears.

• Enforce Strict Fluid Operating Temperature Boundaries: Orbital motor efficiency depends heavily on fluid viscosity. Maintain system operating temperatures below 60°C. Excessive heat thins the hydraulic fluid, inducing internal volumetric slip, causing an immediate speed drop, and accelerating wear on the internal Geroler surfaces.