Product Overview

The LC22E00323F9 / YN22E00694F8 CPU Controller Assembly is the master computer that orchestrates all major functions of your excavator. It continuously processes input from dozens of sensors (monitoring pressures, temperatures, positions, and operator commands) and executes complex algorithms to precisely manage engine RPM via the governor, regulate hydraulic pump displacement for optimal power and efficiency, control electro-proportional valves for smooth implement movement, and oversee all machine safety interlocks and diagnostics. Our replacement controller is engineered to match the original specifications exactly, ensuring perfect hardware compatibility and containing the necessary software logic to seamlessly integrate with your machine’s network.

Key Features & Benefits

• Direct Plug-and-Play OEM Replacement: Guaranteed compatibility as an exact interchange for part numbers LC22E00323F9 and YN22E00694F8, designed for seamless installation into the existing wiring harness of your specified Kobelco -10 Series excavator.

• Resolves Complex Integrated System Failures: Corrects a wide range of interconnected issues such as persistent “limp mode” (engine derate), loss of hydraulic power or control, failure to perform combined movements, unresponsive joysticks, and cascading diagnostic trouble codes (DTCs) that cannot be pinned to a single sensor.

• Restores Factory-Calibrated Performance & Efficiency: The controller houses the essential calibration maps for engine power delivery, hydraulic pump torque control, and system response curves, ensuring your machine operates with its original fuel efficiency, power, and smooth responsiveness.

• Essential for Machine Operation & Safety Features: Modern excavators rely entirely on this ECU for basic operation. It enables engine starting, implements safety shutdowns, and manages critical features like pump torque limiting and swing priority control.

• Ruggedized for Harsh Environments: Housed in a durable, sealed metal or composite casing designed to protect sensitive electronics from extreme vibration, moisture, dust, and temperature fluctuations encountered on construction sites.

• Definitive Repair for ECU Faults: When diagnosis confirms a failure of the main controller, replacement with this assembly is the most reliable and efficient path to restore full functionality, avoiding costly and time-consuming component-by-component troubleshooting.

Technical Specifications

• Part Numbers: LC22E00323F9, YN22E00694F8 (OEM Interchangeable)

• Application: Main Machine Controller / Electronic Control Unit (ECU)

• Compatible Models: Kobelco SK200-10, SK330-10, SK350LC-10, SK380-10 Excavators

• Core Functions: Integrated control of engine, main hydraulic pumps, pilot system, and machine logic.

Frequently Asked Questions (FAQ)

Q1: What are the most common symptoms of a failing main CPU controller?
A: Symptoms often include:

• The machine is stuck in low-engine-power “limp mode.”

• Hydraulic functions are extremely slow, weak, or inoperative.

• The machine will not start or crank (with good batteries and starter).

• The monitor displays multiple, persistent error codes or shows a communication failure with the controller.

• Erratic or uncommanded movements from the hydraulic system.

Q2: Is programming required after installing this new controller?
A: YES, in nearly all cases. A new or replacement main controller must be programmed with the specific software and configuration parameters for your exact machine model and serial number. This requires the OEM diagnostic software (e.g., Kobelco K-Web) and a compatible communication adapter. A controller without the correct software will not function. Confirm programming requirements and availability with the seller.

Q3: Can a skilled mechanic install this, or is it a dealer-only repair?
A: While the physical swap of the unit is straightforward, the diagnosis and post-installation programming are highly specialized. Proper diagnosis requires advanced diagnostic tools to rule out network and sensor issues. Post-installation programming is mandatory and typically requires dealer-level software. Therefore, this repair is strongly recommended for authorized service dealers or technicians with the specific OEM tooling and software.

Q4: How do I know for sure the controller is bad and not just a wiring problem?
A: Professional diagnosis is crucial. Technicians will perform tests including: checking for stable power and ground at the ECU connectors, verifying communication network integrity (CAN bus), scanning for fault codes, and using diagnostic software to perform active tests and monitor live data from the controller itself. Replacing the ECU is the last step after all other possibilities are eliminated.

Q5: What is the difference between part numbers LC22E00323F9 and YN22E00694F8?
A: These are typically interchangeable part numbers for the same physical controller assembly, where one may supersede the other or be used for different production batches of the same machine models. Always verify the correct part number for your specific machine serial number, but they generally service the same application.

Regain Total Control and Productivity. Solve Core Electronic Failures – Inquire About the LC22E00323F9 / YN22E00694F8 CPU Controller Today!