This comprehensive service repair and operation & maintenance manual is designed for the Komatsu PC400-6, PC400LC-6, PC450-6, and PC450LC-6 hydraulic excavators. This manual provides detailed information on maintaining, assembling, disassembling, and servicing your Komatsu excavator, ensuring peak performance through effective, economical, and safe operation and maintenance.

The service repair manual covers a wide range of topics, including general information, structure and function, testing and adjusting, disassembly and assembly, maintenance standards, and additional resources. It contains detailed diagrams, specifications, and real-world photos to guide you through repair, diagnosing, servicing, technical maintenance, and troubleshooting procedures. The manual will empower you to identify issues and understand how to repair and maintain your machine effectively.

The operation & maintenance manual focuses on procedures for operation, handling, lubrication, maintenance, checking, and adjustments. It is a valuable resource for both operators and maintenance personnel, ensuring safe and efficient machine operation. The manual covers general precautions, safety information, operation procedures, transportation guidelines, cold weather operation, long-term storage, troubleshooting, maintenance schedules, wear parts lists, lubrication recommendations, standard tightening torques, periodic replacement of safety-critical parts, and specifications. It also includes sections on options and attachments, handling buckets with hooks, seat belt usage, car heater operation, machine readiness for attachment, introductions to attachments, and extending machine service life.

This manual covers the following models and serial numbers:

* **PC400-6:** S/N: 32001 and up, S/N: 32488 and up
* **PC400LC-6:** S/N: 32001 and up, S/N: 32488 and up
* **PC450-6:** S/N: 12001 and up, S/N: 12629 and up
* **PC450LC-6:** S/N: 12001 and up, S/N: 12629 and up

The Komatsu PC400, 450-6 models utilize the SA6D125-2 and SAA6D125E-2 engines. For detailed engine information, please refer to the 125-2 Series Engine Shop Manual.

The Komatsu PC400-6, PC400LC-6, PC450-6, and PC450LC-6 are a series of powerful hydraulic excavators renowned for their exceptional performance and reliability. These machines are designed for heavy-duty construction, mining, and demolition applications, capable of handling demanding tasks with ease. The PC400-6 and PC450-6 models represent the standard configurations, while the LC versions (PC400LC-6 and PC450LC-6) feature a long undercarriage, extending their reach and providing greater stability on uneven terrain. All models in this series boast a robust construction featuring a durable steel frame, powerful hydraulic systems, and advanced electronic controls that optimize performance and efficiency. The Komatsu engines powering these excavators deliver high torque and horsepower, ensuring ample digging force and fast cycle times.

The PC400-6 and PC450-6 series are highly versatile machines, offering a wide range of attachments to suit various applications. These attachments include heavy-duty buckets, breakers, grapples, and shears, enabling operators to perform a multitude of tasks with precision and efficiency. The operator cab provides a comfortable and ergonomic working environment, featuring a spacious interior, adjustable seat, and intuitive controls for maximum productivity and operator comfort. The advanced hydraulic system in these excavators ensures precise control and smooth operation, minimizing operator fatigue and maximizing productivity. These models are equipped with a comprehensive safety system, including emergency stops, warning lights, and safety features, prioritizing operator and equipment safety in all working conditions.