Product Overview
The OMT Series hydraulic motor (available in OMT 315, OMT 400, OMT 500 and other displacements) is a high-performance low-speed high-torque orbital motor engineered for demanding industrial applications. Featuring an advanced Geroler gear set with disc valve distribution, this motor delivers reliable performance under high-pressure, heavy-duty operating conditions.
The OMT series is 100% interchangeable with Danfoss OMT/OMTS, Eaton Char-Lynn 6000/6K, and M+S MLHT series motors — requiring no modification to mounting flanges, port threads, or output shaft dimensions. Every motor undergoes 100% simulated real-world condition testing before shipment, covering rated pressure loading, peak pressure cycling, and continuous operation thermal validation.
Technical Specifications
OMT 315:
Geometric Displacement: 326.3 cm³/rev
Max. Speed (Continuous): 380 rpm
Max. Speed (Intermittent): 460 rpm
Max. Torque (Continuous): 950 N·m
Max. Torque (Intermittent): 1140 N·m
Max. Output (Continuous): 33.5 kW
Max. Pressure Drop (Continuous): 200 bar
Max. Pressure Drop (Intermittent): 240 bar
Max. Peak Pressure: 280 bar
Max. Flow (Continuous): 125 L/min
Net Weight: 21 kg
OMT 400:
Geometric Displacement: 410.9 cm³/rev
Max. Speed (Continuous): 305 rpm
Max. Speed (Intermittent): 365 rpm
Max. Torque (Continuous): 1080 N·m
Max. Torque (Intermittent): 1260 N·m
Max. Output (Continuous): 31.2 kW
Max. Pressure Drop (Continuous): 180 bar
Max. Pressure Drop (Intermittent): 210 bar
Max. Peak Pressure: 240 bar
Max. Flow (Continuous): 125 L/min
Net Weight: 22 kg
OMT 500:
Geometric Displacement: 523.6 cm³/rev
Max. Speed (Continuous): 240 rpm
Max. Speed (Intermittent): 285 rpm
Max. Torque (Continuous): 1220 N·m
Max. Torque (Intermittent): 1370 N·m
Max. Output (Continuous): 28.8 kW
Max. Pressure Drop (Continuous): 160 bar
Max. Pressure Drop (Intermittent): 180 bar
Max. Peak Pressure: 210 bar
Max. Flow (Continuous): 125 L/min
Net Weight: 23 kg
General Specifications:
Control Type: Disc Valve Distribution with integral pressure compensation
Mounting Flange: Square Flange
Shaft Options: 40mm cylindrical / tapered / splined
Port Connections: G3/4 main ports, G1/2 drain port
Rotation: Bi-directional
Interchangeable With: Danfoss OMT/OMTS, Eaton Char-Lynn 6000/6K, M+S MLHT
Key Technical Advantages
1. Advanced Geroler Gear Set with Disc Valve Distribution
The precision-machined Geroler (internal gear-roller) set combined with a disc valve distribution plate automatically compensates for wear during operation, achieving volumetric efficiency of ≥92% and extended service life. This design ensures smooth, stable output even at low speeds, effectively eliminating stick-slip behavior.
2. Tapered Roller Bearing System
The output shaft is supported by heavy-duty tapered roller bearings capable of accommodating high radial and axial loads simultaneously. This makes the motor particularly suitable for sprocket drives, wheel motor applications, and other scenarios subject to significant side loading. Bearing design life is matched to the motor’s overall overhaul interval, reducing total cost of ownership.
3. High-Pressure Shaft Seal with Wide Operating Envelope
The high-pressure shaft seal design enables continuous working pressure differential up to 20 MPa with peak pressure capability of 28 MPa. The motor maintains stable performance across an operating temperature range of -30°C to +80°C, compatible with mineral hydraulic oils, synthetic fluids, and environmentally friendly biodegradable hydraulic fluids.
4. 100% Plug-and-Play Interchangeability
Mounting flange bolt patterns, output shaft dimensions, and port thread specifications are fully matched to Danfoss OMT/OMTS, Eaton Char-Lynn 6000 series, and M+S MLHT series motors. Customers can complete drop-in replacement without modifying existing hydraulic piping or mounting brackets.
Application Areas
Construction Machinery: Excavator travel drives, rotary drilling rig power heads, road roller vibration wheel drives
Agricultural Machinery: Combine harvester reel drives, tractor hitch systems, irrigation winches
Material Handling: Forklift drive axles, belt conveyor drives, winches and hoists
Mining & Metallurgy: Crusher drives, vibrating screen exciters, continuous casting withdrawal roll drives
Marine & Offshore: Deck machinery, windlass, winch drives
Specialty Vehicles: Street sweeper brush drives, snow blower chute drives
Expert Maintenance Tips
1. Pre-Installation Flushing
Prior to installation, flush the hydraulic system piping to achieve a cleanliness level of NAS 9 (ISO 18/15) or better. Install a 10μm nominal filtration rating pressure line filter at the motor inlet to prevent particulate contaminants from entering the disc valve clearance.
2. Initial Start-Up Air Bleeding
After initial installation or motor replacement, loosen the drain port fitting to bleed air from the motor. Operate at no load and no more than 500 rpm for 5-10 minutes until a steady flow of oil is observed at the drain port before applying load.
3. Drain Line Back Pressure Control
The drain port back pressure must not exceed 0.5 MPa (5 bar). Route the drain line separately to the reservoir below oil level. Avoid sharing the return line with the system return to prevent elevated back pressure that could reduce shaft seal life.
4. Fluid Cleanliness and Change Interval
Use anti-wear hydraulic oil with viscosity grade ISO VG 32-68. Replace the filter element after the first 500 hours of operation, then every 2,000 operating hours or annually, whichever comes first. Periodically test fluid contamination levels; if NAS class exceeds 10, change the oil immediately.
5. Long-Term Storage Protection
For storage exceeding 3 months, fill the motor internal cavity with clean hydraulic oil and cap all ports to prevent internal corrosion. Before re-commissioning, manually rotate the output shaft 2-3 turns to confirm free rotation before applying hydraulic power.
