This manual covers the Komatsu PC400-7, PC400LC-7, PC450-7, and PC450LC-7 hydraulic excavators, specifically for serial numbers PC400-7 and PC400LC-7 starting from 50001, and PC450-7 and PC450LC-7 starting from 20001. These machines are engineered for robust performance in demanding construction and industrial applications, offering exceptional power, durability, and operational efficiency. Their advanced hydraulic systems and sturdy construction ensure reliability and productivity across a wide range of heavy-duty tasks.

The purpose of this comprehensive shop manual is to provide detailed information for the maintenance, repair, and servicing of these Komatsu hydraulic excavators. It includes sections on general structure and function, maintenance standards, testing and adjusting procedures, disassembly and assembly instructions, and technical specifications. This manual serves as an essential resource for owners, technicians, and mechanics to ensure the optimal performance, longevity, and safe operation of their equipment.