This comprehensive Komatsu PC300-5, PC300LC-5, PC300-5 Mighty, PC300LC-5 Mighty, PC300HD-5, PC400-5, PC400LC-5, PC400-5 Mighty, PC400LC-5 Mighty, and PC400HD-5 Hydraulic Excavator Service Repair Manual provides in-depth information on maintaining, assembling, disassembling, and servicing your Komatsu Hydraulic Excavator. The manual covers models with serial numbers starting from 20001 for the PC300 and PC400 series, and 21401 for the PC300HD and 20603 for the PC400HD models. This service manual is designed to be a complete resource for technicians and mechanics working on these Komatsu excavators. It contains detailed specifications, diagrams, and real-world photographic illustrations to guide you through each repair, diagnosis, servicing, and troubleshooting procedure. The manual follows a logical progression, covering everything from basic maintenance to complex repair processes. The manual is organized into four key sections: **Structure and Function:** This section provides a detailed understanding of the excavator's components and how they work together. **Testing and Adjusting:** This section outlines various tests and adjustments that need to be performed during routine maintenance and troubleshooting. **Disassembly and Assembly:** This section provides clear and concise instructions on how to disassemble and reassemble components of the excavator, ensuring proper procedures are followed. **Maintenance Standard:** This section lays out the recommended maintenance schedules and procedures for keeping your Komatsu excavator in top operating condition. This manual is a valuable resource for anyone working on Komatsu PC300-5 and PC400-5 series excavators. It allows you to perform maintenance and repairs efficiently and effectively, minimizing downtime and extending the life of your equipment.

The Komatsu PC300-5, PC300LC-5, PC300-5 Mighty, PC300LC-5 Mighty, PC300HD-5, PC400-5, PC400LC-5, PC400-5 Mighty, PC400LC-5 Mighty, and PC400HD-5 hydraulic excavators represent a range of powerful and versatile machines designed for heavy-duty construction and demolition tasks. These excavators are renowned for their robust build quality, high performance, and advanced features. The PC300 series, with its operating weight ranging from 30 to 35 tons, is ideal for medium-sized projects, while the PC400 series, with its operating weight between 40 and 45 tons, handles larger-scale operations. Both series offer various configurations to suit diverse applications, including standard, long-reach, and high-reach versions. The Komatsu PC300/PC400-5 excavators are equipped with powerful diesel engines that deliver ample power for efficient digging and lifting. These engines are designed for fuel efficiency and low emissions. The excavators boast advanced hydraulic systems that provide smooth and responsive operation, ensuring optimal control and precision. The spacious and ergonomically designed cab offers excellent visibility and comfort for the operator, minimizing fatigue during long working hours. The machines also come equipped with safety features such as an overload protection system and a comprehensive warning system for operator safety. The Komatsu PC300/PC400-5 excavators are highly reliable and durable machines, making them a popular choice for construction professionals worldwide.