Danfoss OMP OMR Series Hydraulic Motor | OMP32 OMR80 OMR160 Orbital Motor

The OMP and OMR Series fixed displacement orbital hydraulic motors manufactured by Chengyuan Hydraulic are low-speed high-torque (LSHT) fluid drive elements fully engineered to match global Danfoss (Sauer-Danfoss) industrial benchmarks. This product series is trusted globally to drive conveyor tracks, agricultural attachments, municipal sweeper brooms, and injection molding auxiliary networks. This professional product catalog explicitly supports core model and ordering configuration strings including OMP32 (151-0341), OMR80 (151-0242), OMR160 (151-0244 / 151-0714), OMR200 (151-0715), and the heavy-displacement OMR315 (151-0717). Employing match-ground Gerotor and Geroler roller-type star arrays, these motors sustain mechanical efficiency and starting torque peaks over years of heavy cycling. Every singular orbital unit undergoes 100% simulated low-speed, full-load torque, and backpressure retention testing prior to shipment to ensure original-matching specifications and offer proven 100% original-place interchangeable compatibility.

Technical Specifications :

• Core Product Series: Danfoss OMP / OMR Series Fixed Displacement Orbital Hydraulic Motors

• Exact Order Number Mapping: 151-0341 (OMP32) / 151-0242 (OMR80) / 151-0244 & 151-0714 (OMR160) / 151-0715 (OMR200) / 151-0717 (OMR315)

• Geometric Displacement Array:

  • OMP32 Designation: 32.0 $cm^3/rev$ (1.95 $in^3/rev$)

  • OMR80 Designation: 80.3 $cm^3/rev$ (4.90 $in^3/rev$)

  • OMR160 Designation: 159.6 $cm^3/rev$ (9.74 $in^3/rev$)

  • OMR200 Designation: 199.8 $cm^3/rev$ (12.19 $in^3/rev$)

  • OMR315 Designation: 314.9 $cm^3/rev$ (19.21 $in^3/rev$)

• Maximum Continuous Working Pressure: Ranges from 14 MPa to 17.5 MPa (140 bar ~ 175 bar / 2540 psi, dependent on exact frame displacement limits)

• Intermittent Peak Pressure Threshold: 17.5 MPa to 22.5 MPa (175 bar ~ 225 bar / 3260 psi)

• Maximum Continuous Torque Profile:

  • OMP32 Base: Rated up to 50 N·m

  • OMR80 Base: Rated up to 190 N·m

  • OMR160 Base: Rated up to 390 N·m

  • OMR315 Base: High-capacity torque up to 570 N·m

• Permissible Continuous Speed Envelope:

  • OMP32 Maximum Velocity: 1500 rpm

  • OMR160 Maximum Velocity: 375 rpm

  • OMR315 Maximum Velocity: 190 rpm

• Shaft and Mounting Layout (151-0714/0715 etc.): Standard 25 mm cylindrical keyed shaft or 1-inch straight keyed drive; paired with standard 2-bolt rhomboid flange (A2 flange template)

• Port Orientation Specifications: Standard G 1/2 main inlet/outlet channels paired with an independent G 1/4 external case drain port

Key Technical Advantages:

• Micro-Finished Geroler Structural Star and Roller Geometry: The OMR series integrates a rolling-contact Geroler gear ring. Machined via high-precision multi-axis CNC grinding machines, the micro-contoured teeth transform standard sliding friction into rolling contact. This layout cuts friction losses during low-speed breakaway states, driving starting torque up by 15% compared to basic orbital options.

• Hydrostatically Compensated Spool-Valving Distribution: The central fluid routing system employs an advanced integrated shaft/spool valve configuration that utilizes active hydraulic wear compensation. As internal temperatures rise during heavy duty cycles, the distribution clearances automatically tighten via localized pilot pressure, sustaining consistent volumetric retention exceeding 90%.

• High-Load Bearings Paired with Heavy-Duty Shaft Seals: The front output nose incorporates heavy-duty needle or deep-groove ball bearing arrangements rated for immense dynamic load limits. This allows the output shaft to support direct radial external forces transmitted by chains, sprockets, or pinion gears. Reinforced with premium shaft seals, the core resists housing backpressures up to 15-17.5 MPa without failure or weeping.

• High-Density Compact Monoblock Castings: For space-restricted configurations like the OMP32, the housing is cast from high-tensile nodular graphite iron. This minimizes physical envelope sizing and total dry mass while protecting core strength, allowing seamless packaging into tight vehicle outrigger joints or compact drive compartments.

Application Areas:

• Agricultural Harvest Equipment Attachments: Reeling mechanisms for combine harvesters, rotational drives for brush cutter decks, and seed-metering shaft controllers for planters.

• Industrial Bulk Material Conveyor Networks: Direct torque units governing automated processing line belts, heavy aggregate conveyors, and scrap material scraper lines.

• Municipal Sweepers & Environmental Refuse Vehicles: Primary drive operators for road sweeper undercarriage brooms and compact vehicle recovery winches.

Expert Maintenance Tips:

• Mandatory Connection of External Case Drain Line: Even though the OMR series integrates high-pressure shaft seals, for circuits subjected to continuous heavy loads, rapid bi-directional cycling, or series-connected multi-motor arrays, the G 1/4 case drain port must be piped independently back to the reservoir. Leaving the drain plugged under these conditions trapping high internal backpressures will accelerate seal lip fatigue and cause early failure.

• Pre-Lubrication Case Priming Protocol: Before starting up a newly installed or long-stored motor, the interior motor housing must be completely pre-filled with clean hydraulic fluid through its case port. Run the motor completely unloaded at low speeds ($< 100 \text{ rpm}$) for 3 to 5 minutes to sweep out trapped air pocket pockets, preventing dry running on the Geroler profiles.

• Rigidly Control Contamination and Particulate Redlines: The internal tracking tolerances between the star and the valving spool are precision-matched. Maintain system fluid filtration thresholds to at least $\beta_{10} \ge 75$ (ISO 4406 20/16/13). Abrasive metal fines or silica dust entering the motor will score the internal profiles, causing high-temperature thermal efficiency drop-offs and high case bypass leakage.