This manual covers the Komatsu PC400-7, PC400LC-7, PC450-7, and PC450LC-7 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 demanding construction and earthmoving applications, offering robust performance and reliability. Their advanced design prioritizes operational efficiency and durability in challenging work environments.

This comprehensive service manual provides essential information for the maintenance, repair, and technical understanding of these Komatsu excavator models. It includes detailed procedures, specifications, and troubleshooting guidance to assist owners, technicians, and mechanics in ensuring optimal performance and longevity of the equipment. Adhering to the information within this manual will support effective upkeep and operational readiness.