This document provides comprehensive service information for the Komatsu PC09-1 excavator, designed for a wide range of compact earthmoving applications. Built with Komatsu's renowned engineering and commitment to reliability, this model offers robust performance and operational efficiency in confined spaces. Its compact design and versatile capabilities make it an ideal choice for landscaping, utility work, and other demanding tasks where precision and power are essential. This Workshop Service Repair Manual is the complete official factory resource for the Komatsu PC09-1 excavator, serial numbers 10001 and up. It details essential maintenance procedures, diagnostic troubleshooting, technical specifications, and safety guidelines. This manual is an indispensable tool for owners, mechanics, and technicians to ensure the proper upkeep, efficient operation, and longevity of the PC09-1 excavator.