This comprehensive Komatsu PC400-6, PC400LC-6, PC450-6, PC450LC-6 Hydraulic Excavator Service Repair Manual is designed to provide you with detailed information on maintaining, assembling, disassembling, and servicing your machine. The manual covers models with serial numbers PC400-6 & PC400LC-6: 32001 and up, and PC450-6 & PC450LC-6: 12001 and up.

The manual includes detailed information on the SA6D125-2 engine used in these models. You will find extensive specifications, diagrams, real photo illustrations, and schemes that guide you through every step of the repair, diagnosing, servicing, technical maintenance, and troubleshooting processes. With this manual, you can confidently tackle repairs and maintain your Komatsu excavator without relying on professional service.

This manual is organized into nine sections for ease of use:

* **General:** Provides an overview of the machine and its specifications.
* **Structure and Function:** Explains the working principles and components of the excavator.
* **Testing and Adjusting:** Guides you through testing and adjusting various excavator systems.
* **Disassembly and Assembly:** Provides step-by-step instructions for disassembling and reassembling components.
* **Maintenance Standard:** Outlines the recommended maintenance procedures and schedules.
* **Others:** Contains additional information such as troubleshooting guides and wiring diagrams.

This manual is an invaluable resource for anyone who owns or operates a Komatsu PC400-6, PC400LC-6, PC450-6, or PC450LC-6 Hydraulic Excavator. It enables you to save time and money by empowering you to perform repairs and maintenance independently.

The Komatsu PC400-6, PC400LC-6, PC450-6, and PC450LC-6 hydraulic excavators are powerful and versatile machines designed for heavy-duty construction and earthmoving tasks. These models, produced by Komatsu, a leading manufacturer of construction equipment, are renowned for their durability, reliability, and advanced technology. The "LC" in the model name designates long-carriage versions, offering increased reach and digging depth. The PC400-6 and PC450-6 series feature a range of improvements over their predecessors, including a more powerful engine, enhanced hydraulic system, and improved operator comfort. These machines are equipped with powerful diesel engines that provide ample torque and horsepower for demanding applications. The sophisticated hydraulic system delivers smooth and precise control of the boom, arm, and bucket, allowing for efficient digging, loading, and material handling.

Komatsu has incorporated a number of features to enhance operator comfort and safety. The spacious and ergonomic cab provides excellent visibility and a comfortable working environment. The advanced control system features intuitive controls and a user-friendly display, reducing operator fatigue and enhancing productivity. The PC400-6 and PC450-6 series are equipped with various safety features, such as a reinforced structure, emergency stops, and a comprehensive monitoring system. These machines are designed to withstand harsh operating conditions and meet stringent safety standards. The Komatsu PC400-6, PC400LC-6, PC450-6, and PC450LC-6 hydraulic excavators are widely used in various construction projects, including road construction, mining, quarrying, and demolition. Their impressive power, durability, and advanced features make them invaluable tools for contractors and operators seeking high performance and efficiency.