Product Overview
This 6K series high-performance orbital hydraulic motor is a direct drop-in replacement for Eaton Char-Lynn 6000 series motors, fully covering 6K-195 through 6K-985 displacement configurations. It perfectly replaces Danfoss OMT series, M+S MT series, and Parker equivalents, as well as Eaton part numbers such as 612-1064.
Featuring an advanced disc-valve Geroler gear set with automatic wear compensation, this motor maintains high volumetric efficiency across the full operating range. The output shaft is supported by double taper roller bearings with locknut-adjusted clearance, enabling high radial load capacity for heavy vehicle and traction drive applications.
Every unit undergoes 100% simulated working-condition bench testing before shipment, verifying that displacement, pressure, torque, and speed characteristics fully match original Eaton Char-Lynn specifications. This ensures true drop-in interchangeability — no modification to mounting flange, shaft extension, or port configuration is required for replacement.
Technical Specifications
6K/6000 Series Full Displacement Range (Based on Eaton Char-Lynn 6000 Series Data):
Displacement-Specific Parameters:
6K-195: Displacement 195 ml/r, Continuous Speed 775 rpm, Intermittent Speed 866 rpm, Continuous Pressure 20.5 MPa, Intermittent Pressure 31 MPa, Continuous Torque 572 N·m, Intermittent Torque 852 N·m, Weight 28.1 kg
6K-245: Displacement 245 ml/r, Continuous Speed 615 rpm, Intermittent Speed 834 rpm, Continuous Pressure 20.5 MPa, Intermittent Pressure 31 MPa, Continuous Torque 733 N·m, Intermittent Torque 1176 N·m, Weight 28.6 kg
6K-310: Displacement 310 ml/r, Continuous Speed 485 rpm, Intermittent Speed 698 rpm, Continuous Pressure 20.5 MPa, Intermittent Pressure 31 MPa, Continuous Torque 928 N·m, Intermittent Torque 1356 N·m, Weight 29.2 kg
6K-390: Displacement 390 ml/r, Continuous Speed 387 rpm, Intermittent Speed 570 rpm, Continuous Pressure 20.5 MPa, Intermittent Pressure 31 MPa, Continuous Torque 1155 N·m, Intermittent Torque 1635 N·m, Weight 30 kg
6K-490: Displacement 490 ml/r, Continuous Speed 307 rpm, Intermittent Speed 454 rpm, Continuous Pressure 17 MPa, Intermittent Pressure 27.5 MPa, Continuous Torque 1215 N·m, Intermittent Torque 1885 N·m, Weight 30.9 kg
6K-625: Displacement 625 ml/r, Continuous Speed 241 rpm, Intermittent Speed 355 rpm, Continuous Pressure 14 MPa, Intermittent Pressure 17 MPa, Continuous Torque 1330 N·m, Intermittent Torque 1380 N·m, Weight 32.1 kg
6K-800: Displacement 800 ml/r, Continuous Speed 184 rpm, Intermittent Speed 276 rpm, Continuous Pressure 12 MPa, Intermittent Pressure 14 MPa, Continuous Torque 1380 N·m, Intermittent Torque 1650 N·m, Weight 32.5 kg
6K-985: Displacement 985 ml/r, Continuous Speed 153 rpm, Intermittent Speed 230 rpm, Continuous Pressure 12 MPa, Intermittent Pressure 14 MPa, Continuous Torque 1570 N·m, Intermittent Torque 1875 N·m, Weight 33.5 kg
General Specifications:
Max Continuous Flow: 150 L/min
Max Intermittent Flow: 225 L/min
Control Method: Disc valve distribution with automatic compensation
Mounting: Square flange / Magneto mount / Wheel mount (optional)
Shaft Options: Straight key φ40 / Splined 8D-42×36×7 (optional)
Port Size: G 3/4 / M33×2
Drain Port: G 1/4 / M14×1.5
Material: Cast iron housing
Max Operating Temperature: 82°C
Max Allowable Back Pressure: 10 MPa (recommended ≤ 5 MPa)
Key Technical Advantages
1. Disc Valve Distribution with Automatic Compensation
The disc valve design automatically compensates for distribution surface wear, maintaining high volumetric efficiency across the full operating range. It combines high-speed distribution with low-speed high-torque capability, significantly reducing internal leakage and extending service life.
2. Heavy-Duty Taper Roller Bearing System
The output shaft is supported by heavy-duty taper roller bearings with locknut-adjusted clearance, capable of withstanding high axial and radial loads (max dynamic side load 3600 lb at key). Suitable for chain-and-sprocket drives and direct wheel mounting applications, ensuring smooth operation from low-pressure startup to high-pressure running.
3. High-Pressure Shaft Seal with Bidirectional Rotation
Imported high-pressure oil seals allow housing pressures up to 175 bar without external drain lines. With external drain, peak return line pressure can reach 200 bar. The motor supports bidirectional rotation without additional check valves.
4. Precision-Machined Geroler Gear Set
The Geroler gear set is precision-ground and paired with optimized stator curves and advanced linkage shaft design, delivering smooth high-speed operation, stable low-speed performance, low noise, and high efficiency. Cycloidal rotor profile modification further reduces operating noise and pressure pulsation.
5. Modular Compact Construction
The compact, lightweight design (28–33.5 kg) is available in multiple connection configurations including small square flange, large square flange, wheel motor, bearingless motor, and brake motor. It is compatible with Eaton, Danfoss, M+S, and other mainstream brand mounting interfaces.
Application Areas
Construction Machinery: Horizontal directional drilling rigs, coal mine drilling rigs, trenchless pipe laying rigs, concrete pump trucks
Agricultural Equipment: Combine harvesters, corn harvester wheel drives, mowers
Material Handling: Forklift drive wheels, winches, hoists, conveyors
Road Maintenance: Snow removal vehicles, street sweepers, cleaning vehicles
Industrial Equipment: Injection molding machines, augers, rotary drive units
Expert Maintenance Tips
Installation:
Verify that flange pilot and shaft dimensions precisely match the original Eaton Char-Lynn 6000 series before installation. Eaton part numbers such as 612-1064 can be directly interchanged.
Prime the housing with clean hydraulic oil before first startup. Perform a 1-hour run-in at 40% maximum working pressure before full-load operation.
Operation & Maintenance:
Use N68 anti-wear hydraulic oil with viscosity 37–73 cSt and cleanliness no lower than ISO 18/13.
Regularly monitor drain port back pressure; continuous back pressure must not exceed 5 MPa, with maximum allowable back pressure of 10 MPa.
Under intermittent conditions, running time must not exceed 10% per minute. Avoid simultaneous operation at maximum pressure and maximum speed.
Maximum operating temperature must not exceed 80°C.
Storage:
