This comprehensive Komatsu PC400-7, PC400LC-7, PC450-7, and PC450LC-7 Hydraulic Excavator Workshop Service Repair Manual provides detailed instructions and illustrations for servicing and repairing these powerful machines. The manual guides you through every step of the process, from basic maintenance to complex repairs, ensuring a thorough understanding of each procedure. With its detailed illustrations and step-by-step instructions, this manual is an invaluable resource for both experienced mechanics and DIY enthusiasts. It covers a wide range of topics, including: * **Engine and Transmission:** Detailed information on engine components, fuel systems, cooling systems, and transmission operation and repair. * **Hydraulic System:** In-depth coverage of hydraulic pumps, valves, cylinders, and circuits, including troubleshooting and maintenance procedures. * **Undercarriage:** Detailed instructions for servicing and repairing tracks, sprockets, rollers, and other undercarriage components. * **Electrical System:** Comprehensive guidance on wiring diagrams, electrical components, troubleshooting, and repair procedures. * **Operator's Cab:** Information on cab components, operator controls, safety features, and maintenance requirements. This manual is specifically designed to guide you through each service and repair procedure with exceptional detail, making it a vital tool for keeping your Komatsu excavator in top operating condition.

The Komatsu PC400-7, PC400LC-7, PC450-7, and PC450LC-7 are powerful hydraulic excavators designed for heavy-duty construction and earthmoving operations. These machines are renowned for their robust build, advanced technology, and exceptional performance. The PC400-7 and PC450-7 models represent the standard configurations, while the PC400LC-7 and PC450LC-7 boast long undercarriage for increased stability and reach. These excavators feature powerful Komatsu engines, delivering impressive digging force and lifting capacity. They are equipped with sophisticated hydraulic systems, ensuring smooth and efficient operation. Advanced electronic controls enhance operator comfort and safety, optimizing machine performance and fuel consumption. Operators benefit from spacious and ergonomically designed cabs, offering excellent visibility and intuitive controls for precise operation. The Komatsu PC400-7 and PC450-7 series excavators are versatile machines suitable for a wide range of applications. They excel in large-scale construction projects, including excavation, loading, and material handling. Their impressive digging depth and reach make them ideal for foundation work, trenching, and road construction. These excavators are also commonly employed in mining, quarrying, and demolition projects. The robust build and advanced features of the Komatsu PC400-7 and PC450-7 series ensure long-term reliability and durability, even in demanding conditions. Their advanced safety features and operator-friendly design prioritize operator well-being and contribute to improved productivity. The combination of power, efficiency, and reliability makes these excavators a preferred choice for professionals in the construction and earthmoving sectors.