This manual supplement provides essential information for the Komatsu PC400-6, PC400LC-6, PC450-6, and PC450LC-6 hydraulic excavators, specifically for serial numbers PC400-6 32488 and up, PC400LC-6 32488 and up, PC450-6 12629 and up, and PC450LC-6 12629 and up. These excavators are engineered for demanding construction and earthmoving applications, built with Komatsu's renowned commitment to durability and performance. This supplement focuses on specific updates and information not covered in the general shop manual, ensuring you have the most current details for these robust machines.

The purpose of this supplement is to assist owners, operators, and service technicians in maintaining the optimal performance and longevity of your Komatsu excavators. It details specific procedures, technical specifications, and troubleshooting guidance relevant to the covered serial number ranges. By referencing this manual, you can ensure that all maintenance and repair tasks are performed correctly, minimizing downtime and maximizing the operational efficiency of your equipment.