This comprehensive service repair manual provides in-depth information for the Komatsu PC300-5, PC300LC-5, PC300LC-5K, PC300HD-5, PC300-5 Mighty, PC300LC-5 Mighty, PC400-5, PC400LC-5, PC400HD-5, PC400-5 Mighty, and PC400LC-5 Mighty hydraulic excavators. It includes detailed instructions, diagrams, and specifications for all aspects of maintenance, repair, and troubleshooting. The manual covers topics such as:

* **Engine and Transmission:** Covers everything from engine specifications and maintenance schedules to detailed repair procedures for engine components, transmissions, and related systems.
* **Hydraulic System:** Provides extensive information on the hydraulic system, including pumps, motors, valves, and cylinders. You'll find detailed diagrams, troubleshooting guides, and step-by-step repair procedures.
* **Electrical System:** Includes wiring diagrams, component descriptions, and detailed instructions for diagnosing and repairing all electrical components.
* **Undercarriage and Track System:** Covers the undercarriage components, including tracks, rollers, sprockets, and idlers. You'll find detailed instructions on maintenance and repair, including adjustments and replacement procedures.
* **Cab and Controls:** Includes information on the operator's cab, controls, and safety systems. You'll find diagrams, specifications, and repair procedures for all components.
* **Troubleshooting and Diagnostic Procedures:** Provides comprehensive troubleshooting guides and diagnostic procedures for common issues encountered with these excavators.
* **Parts Lists and Specifications:** Includes detailed parts lists and specifications for all components, making it easier to identify and order the correct parts.

This service repair manual is an indispensable resource for anyone working on these Komatsu excavators, whether you are a professional mechanic or a DIY enthusiast.

The Komatsu PC300-5 series represents a range of powerful and versatile hydraulic excavators designed for heavy-duty construction and earthmoving applications. This series includes models like the PC300-5, PC300LC-5, PC300LC-5K, PC300HD-5, PC300-5 Mighty, and PC300LC-5 Mighty, all sharing a common platform but offering varying configurations and capabilities. These excavators are renowned for their robust construction, powerful hydraulics, and operator comfort. They are equipped with powerful engines, large digging forces, and advanced control systems, ensuring high productivity and efficiency in various tasks. The PC300-5 series offers a choice of boom and stick configurations, allowing for optimal reach and digging depth to suit specific job requirements. The "Mighty" variants typically feature additional counterweights and reinforced structures, enhancing their lifting capacity and stability.

The Komatsu PC400-5 series, which includes the PC400-5, PC400LC-5, PC400HD-5, PC400-5 Mighty, and PC400LC-5 Mighty models, expands on the capabilities of the PC300-5 series by offering higher lifting capacities and digging forces. These excavators are designed for even more demanding tasks, such as large-scale earthmoving, heavy lifting, and quarrying applications. The PC400-5 series features larger engines, improved hydraulic systems, and enhanced chassis strength. The "Mighty" variants further emphasize stability and lifting power, making them ideal for handling heavy loads and challenging terrain conditions. The PC400-5 series prioritizes operator comfort with spacious cabins, ergonomic controls, and advanced safety features, ensuring efficient and safe operation even in the most demanding environments.