This comprehensive manual provides detailed information on maintaining, assembling, disassembling, and servicing your Komatsu PC400-7, PC400LC-7, PC450-7, and PC450LC-7 hydraulic excavators. It's a valuable resource for operators and maintenance personnel, helping to achieve peak performance through effective, economical, and safe machine operation and maintenance.

The manual is divided into two parts: a service repair manual and an operation & maintenance manual.

The service repair manual is packed with specifications, diagrams, and real photo illustrations providing step-by-step instructions for repair, diagnostics, servicing, technical maintenance, and troubleshooting procedures. It covers a wide range of topics, including:

* **General Information:** This section provides an overview of the machine and its components.
* **Structure, Function, and Maintenance Standards:** This section delves into the machine's design, how it operates, and the recommended maintenance practices.
* **Testing and Adjusting:** This section covers procedures for checking and adjusting various machine systems and components.
* **Disassembly and Assembly:** This section provides detailed instructions for taking apart and putting back together various components of the machine.
* **Others:** This section covers additional information related to the machine's operation and maintenance.

The operation & maintenance manual focuses on the practical aspects of using and caring for your excavator. It includes:

* **Foreword:** A general introduction to the manual.
* **Safety:** Crucial safety guidelines and precautions for operating and maintaining the machine.
* **Operation:** Clear instructions on operating the excavator safely and efficiently.
* **Maintenance:** Detailed procedures for routine maintenance, lubrication, and inspection.
* **Specifications:** Essential technical information about the machine, including dimensions, capacities, and performance data.
* **Attachments and Options:** Information about available attachments and options for your excavator.
* **Index:** A comprehensive index for easy reference to specific topics.

This manual covers machines with the following serial numbers:

* PC400-7: S/N: 50001 and up
* PC400LC-7: S/N: 50001 and up
* PC450-7: S/N: 20001 and up
* PC450LC-7: S/N: 20001 and up

The PC400, 400LC, PC450, and 450LC-7 models are equipped with the SAA6D125E-3 engine. For specific details on the engine, consult the 125-3 Series Engine Shop Manual.

The Komatsu PC400-7, PC400LC-7, PC450-7, and PC450LC-7 are powerful and versatile hydraulic excavators designed for heavy-duty construction and earthmoving applications. These models boast a robust build with advanced technology, ensuring optimal performance and reliability on challenging job sites. They are equipped with a powerful Komatsu SAA6D170E-7 engine, offering exceptional power and fuel efficiency. The hydraulic system is engineered for precise control and smooth operation, providing operators with effortless maneuverability. The spacious and comfortable cab offers excellent visibility, ergonomic controls, and advanced safety features, enhancing operator comfort and productivity. These excavators are available in both standard (PC400-7, PC450-7) and long reach (PC400LC-7, PC450LC-7) configurations, catering to diverse project requirements.

The Komatsu PC400-7 and PC450-7 series have established themselves as industry leaders, renowned for their exceptional performance, durability, and fuel efficiency. Their advanced hydraulic system delivers smooth and precise control, while the powerful engine ensures efficient operation even in demanding conditions. The strong undercarriage and robust components guarantee longevity and minimal downtime. Furthermore, Komatsu's commitment to operator safety is evident in the spacious and ergonomic cab, designed to minimize fatigue and maximize operator comfort. These excavators are equipped with a range of safety features, including a comprehensive monitoring system and an emergency shutdown mechanism. The availability of various attachments further enhances their versatility, allowing them to tackle a wide range of tasks with ease.