This comprehensive shop manual covers the Komatsu PC400-7, PC400LC-7, PC450-7, and PC450LC-7 hydraulic excavators, specifically for serial numbers PC400-7 and PC400LC-7 from 50001 onwards, and PC450-7 and PC450LC-7 from 20001 onwards. These machines are engineered for demanding construction and industrial applications, offering robust performance and exceptional durability. Their advanced hydraulic systems and powerful engines ensure efficient operation and productivity across a wide range of tasks, from heavy excavation to material handling.

This manual serves as an essential resource for owners, technicians, and mechanics, providing detailed information for the maintenance, repair, and servicing of these excavators. It includes in-depth procedures, diagnostic troubleshooting guides, technical specifications, and safety instructions. By following the guidance within this document, users can ensure optimal performance, longevity, and safe operation of their Komatsu hydraulic excavators, facilitating efficient upkeep and minimizing downtime.