OMT Hydraulic Motor | Danfoss OMT160 OMT250 OMT500 Replacement

Genlu Hydraulic specializes in the continuous engineering and production of heavy-duty, industrial-grade low-speed high-torque (LSHT) hydraulic orbit motors. The OMT Series Variable Large-Displacement Orbit Hydraulic Motor is precision-built as a rugged, high-performance, and 100% drop-in interchangeable alternative to the industry benchmark Danfoss classic OMT and OMTS (151B- prefix series) disc valve orbital motor lines. We provide comprehensive order support for standard configurations, prominently featuring replacement units for OMT160 (151B-3000), OMT250 (151B-3002), and the maximum displacement framework OMT500 (151B-2055).

Under extreme operations involving high-torque rotational starts, continuous directional reversals, and intense external physical shocks, a motor’s volumetric stability and bearing load limit define the system’s uptime. Genlu’s OMT series motors conform precisely to original manufacturer standards across all physical envelopes, 4-bolt square mounting patterns, straight parallel/involute splined shaft extensions, and SAE/Metric fluid port dimensions. Prior to final dispatch, every unit undergoes 100% Full-Simulation Condition Testing on digitized diagnostic benches. This process strict-logs starting torque metrics, micro-rpm stability under maximum intermittent pressures (up to 240 bar), and case seal integrity, delivering consistent fluid power solutions for global industrial B2B supply chains.

Technical Specifications 

• Product Line: OMT Series Heavy-Duty Disc Valve Hydraulic Orbit Motor (Fully compatible with Danfoss 151B- platforms)

• Core Cross-Referenced Models & Part Numbers:

  • OMT160 (Part Number: 151B-3000, Geometric Displacement: 160.8 $cc/rev$)

  • OMT200 (Geometric Displacement: 201.3 $cc/rev$)

  • OMT230 (Geometric Displacement: 230.1 $cc/rev$)

  • OMT250 (Part Number: 151B-3002, Geometric Displacement: 252.0 $cc/rev$)

  • OMT315 (Geometric Displacement: 314.9 $cc/rev$)

  • OMT500 (Part Number: 151B-2055, Geometric Displacement: 470.6 $cc/rev$)

• Continuous Operating Pressure Matrix: 180 bar to 200 bar (2610 psi to 2900 psi, tailored per frame configuration)

• Maximum Intermittent Peak Pressure: 240 bar (24.0 MPa / 3480 psi)

• Continuous Rated Output Torque: From 470 $N\cdot m$ (OMT160) up to 1220 $N\cdot m$ (OMT500)

• Intermittent Peak Output Torque: From 560 $N\cdot m$ (OMT160) up to 1370 $N\cdot m$ (OMT500)

• Maximum Permissible Continuous Flow Feed: 75 $L/min$ (OMT160) up to 125 $L/min$ (OMT500)

• Shaft Rotational Speed Envelope: 10 rpm to 625 rpm

• Fluid Distribution Profile: Modular Independent Disc Valve Geometry

• Output Drive Shaft Profiles: Ø40 mm cylindrical parallel keyed shaft, 1.5-inch straight flat-keyed shaft, or standard 17-tooth/16-tooth involute splined extensions

• Mounting Flange Configuration: Standard 4-bolt square pattern (Bolt Circle Diameter Ø160 mm, Pilot Location Diameter Ø125 mm)

• Average Casing Net Weight: 20.0 kg to 23.5 kg (44.1 lbs to 51.8 lbs)

Key Technical Advantages:

• Geroler® Gear Set with Hydrodynamic Rollers: Features high-accuracy integrated rollers within the outer ring stator teeth. By substituting sliding contacts with rolling friction elements, the mechanical resistance during tooth mesh is minimized. This configuration completely eliminates low-speed stick-slip “cogging” down to 15 rpm while ensuring high mechanical starting efficiency (exceeding 85% of rated torque).

• Advanced Axis-Isolated Disc Valve System: Features a separate distribution disc driven by an independent internal drive link, isolating it from the high-torque output shaft. The disc valve dynamically auto-compensates for clearance variations based on real-time circuit pressure. It maintains micron-scale face contact across severe thermal cycles, keeping volumetric efficiencies steadily above 96%.

• Dual Oversized Tapered Roller Bearings Support: Designed with heavy-duty tapered roller bearings bracing the front and rear journals of the main drive shaft. This rigid layout enables the output shaft to absorb huge external mechanical stresses directly—supporting a maximum permissible radial load capacity up to 30,000 N without the need for outboard bearing blocks or support housings.

• High-Pressure Structural Shaft Seal with Integral Isolation Check Valves: Outfitted with a premium-tier dynamic rubber shaft seal paired with internal directional check valves. This assembly allows the front seal to withstand return-to-tank back-pressure spikes up to 140 bar without an external drain line connected, preventing external weeping and seal extrusion.

Application Areas:

• Mining Machinery & Subterranean Geotechnical Drilling: Rotary drill heads, subterranean scraper conveyors, roof bolting machinery rigs, and blast-hole drilling aggregates.

• Heavy Construction & Foundation Engineering: High-capacity winches for rotary piling rigs, crane primary hoist loops, and low-speed high-torque track drive gearboxes for utility equipment.

• Industrial Material Conversion & Heavy Feeding Blocks: Reciprocating screw drives and mold adjustments for plastic injection molding machines, steel mill run-out conveyor tables, and large industrial refuse compactors.

Expert Maintenance Tips:

• Exact OEM Part Number Mapping: Danfoss ordering codes (such as 151B-3000 and 151B-3002) define specific configurations, including displacement sizes, output shafts (cylindrical vs. splined), and port thread standards (Metric G-threads vs. US UNF threads). To ensure accurate installation, provide a photo of the original nameplate to Genlu engineers for layout validation.

• Mandatory External Case Drain for High-Back-Pressure Loopings: If the motor is configured in a series loop or runs with return back-pressures exceeding 20 bar, you must open the top G1/4″ (or 7/16-20UNF) case drain port and route a dedicated line directly back to the reservoir. This relieves internal pressure from the shaft cavity, protects the main seal, and flushes the tapered bearings to enhance cooling and extend service life.

• Pre-Lubrication Commissioning Routine: Before connecting mechanical drives or engaging high-pressure power for the first time, pre-fill the orbit motor housing completely with fresh, filtered system hydraulic oil through the inlet or case drain port. This initial fluid volume ensures immediate lubrication for the disc valve faces and tapered rollers at startup, protecting the components from dry-run scoring.