Eaton Char-Lynn 2K Series Hydraulic Motor | 2K-195 2K-305 2K-490 Replacement

The 2K Series (equivalent to the 2000 Series) low-speed high-torque (LSHT) hydraulic motors manufactured by Chengyuan Hydraulic are high-performance drive units engineered to cross-reference the rigorous technical standards of Eaton Char-Lynn. Focused on the core models provided—2K-195, 2K-305, 2K-395, and 2K-490 (including specific part numbers like 604-6017-15 and 604-1265)—this series features the advanced Geroler® gear set design. Unlike standard gerotor motors, the 2K series utilizes an independent disc valve distribution mechanism, allowing for higher volumetric efficiency and superior performance under high-pressure and heavy radial loads. These motors offer 100% original-place interchangeability with Char-Lynn in terms of mounting flanges, shaft ends, and porting. Every unit undergoes 100% simulated condition testing to ensure smooth low-speed starting and exceptional torque stability, providing a high-value alternative for demanding B2B industrial and mobile applications.

Technical Specifications:

• Brand Compatibility: Eaton Char-Lynn 2000 (2K) Series Interchangeable

• Displacement Class Matrix:

  • 2K-195: 195 $cm^3/rev$ (11.9 $in^3/r$)

  • 2K-305: 305 $cm^3/rev$ (18.6 $in^3/r$)

  • 2K-395: 395 $cm^3/rev$ (24.0 $in^3/r$)

  • 2K-490: 490 $cm^3/rev$ (30.0 $in^3/r$)

• Maximum Continuous Pressure: 205 bar (3000 PSI)

• Maximum Intermittent Pressure: 275 bar (4000 PSI)

• Maximum Continuous Torque: Spanning 500 Nm to 850 Nm depending on size

• Maximum Flow Capacity: 75 L/min (20 GPM)

• Output Shaft Options: 1-1/4″ Straight Keyed, Splined, or Tapered (1:8)

• Mounting Configuration: Standard SAE A 2-Bolt or 4-Bolt patterns

• Distribution Type: Independent Disc Valve (Pressure compensated)

Key Technical Advantages:

• Precision Geroler® Technology: By incorporating rollers into the stationary outer gear, our Geroler set reduces sliding friction during engagement. This results in an incredibly low breakout pressure ($\le 0.8$ MPa) and significantly smoother rotation at low speeds, eliminating the “crawling” effect found in lower-quality motors.

• Advanced Disc Valve Mechanism: The independent disc valve is pressure-compensated, meaning it automatically balances the clearance between the valve and the manifold based on operational pressure. This maintains a volumetric efficiency above 90% even at the 205 bar continuous rating and reduces heat generation by minimizing internal bypass.

• Heavy-Duty Tapered Roller Bearings: The output shaft is supported by dual high-capacity tapered roller bearings. This architecture allows the motor to sustain high radial and axial side loads directly, making it ideal for gear or sprocket drives without the need for additional external bearing supports.

• High-Pressure Shaft Seal: Equipped with premium high-pressure shaft seals, the 2K series can withstand backpressures up to 150 bar. This ensures leak-free performance in tough environments and provides a robust barrier against external contamination.

Application Areas:

• Mobile Equipment Propulsion: Skid steer loader attachments, mini-excavator track drives, and harvester reel drives.

• Industrial Material Handling: Mining conveyor drives, heavy-duty wood splitters, and industrial mixers.

• Specialized Machinery: Street sweeper brush drives, winch systems, and forestry mulcher rotations.

Expert Maintenance Tips:

• Mandatory Pre-Fill Command: Before the initial startup or after a long period of inactivity, the motor case must be filled with clean hydraulic oil via the drain or inlet port. Running a cycloid motor dry for even a few seconds can cause permanent scoring on the precision Geroler surfaces.

• Case Drain Optimization: Although the high-pressure seal is robust, we recommend connecting a dedicated case drain line to the tank if the return line pressure consistently exceeds 2 MPa (300 PSI). This keeps the seal cool and prevents premature hardening or failure.

• Contamination Control: The precision disc valve is sensitive to hard particulates. Ensure the system maintains a filtration rating of $\beta_{10} \ge 100$. Regularly check the oil’s acidity and water content to prevent corrosion on the rollers and gear set.