This comprehensive Komatsu PC400-7, PC450-7, and PC400LC-7 shop manual provides detailed instructions and specifications for servicing and repairing these powerful excavators. The manual covers models with serial numbers PC400-7 50001 and up, PC400LC-7 50001 and up, PC450-7 20001 and up, and PC450LC-7 20001 and up. Its 782 pages are packed with easy-to-understand text, high-quality diagrams, pictures, and illustrations, designed to guide you through every step of troubleshooting, repair, and overhaul. The step-by-step instructions ensure you complete any task correctly and efficiently, saving you time and preventing errors. All necessary specifications and tolerances are included, along with clear explanations of component functions. This manual is an invaluable resource for mechanics, technicians, and anyone involved in maintaining and repairing these Komatsu excavators.

The Komatsu PC400-7, PC450-7, and PC400LC-7 are powerful and versatile hydraulic excavators designed for demanding construction and earthmoving applications. These machines are known for their robust construction, powerful engines, and advanced hydraulic systems, making them ideal for heavy-duty tasks such as excavation, loading, demolition, and material handling. The PC400-7 and PC450-7 models are standard excavators with a conventional boom and arm configuration, while the PC400LC-7 is a long-reach excavator featuring a longer boom and arm for greater reach and working range. All three models share a common platform, utilizing the same engine, hydraulic system, and many other components, ensuring consistency and reliability across the line. These excavators are powered by Komatsu's renowned SAA6D140E-7 engine, a six-cylinder turbocharged and after-cooled diesel engine known for its high power output, fuel efficiency, and low emissions. The engine is paired with a high-flow hydraulic system that delivers ample power to the excavator's hydraulic components, including the swing, boom, and arm cylinders, as well as the attachment. The advanced hydraulic system features features like electronic control and regenerative braking, contributing to improved fuel efficiency, reduced operating costs, and enhanced operator comfort. Beyond power and performance, these excavators prioritize operator comfort and safety. The spacious and ergonomically designed cab provides excellent visibility, a comfortable seat, and intuitive controls. The machines are equipped with numerous safety features, including a ROPS/FOPS certified cab, an emergency shutdown system, and an optional rearview camera. This comprehensive safety package ensures a secure and productive working environment for the operator.