This Service Shop Repair Manual provides comprehensive information for the Komatsu WA120-1LC, part of the WA120 Series, manufactured from 20001 and up. Engineered for reliability and performance, this diesel-powered machine is designed for demanding operational environments. Its robust construction and advanced features ensure efficient material handling and operational longevity, making it a valuable asset for various industrial and construction applications. This manual serves as an essential resource for maintaining and repairing your Komatsu WA120-1LC. It covers a wide range of topics, including detailed step-by-step instructions for removal and installation, preventative maintenance guidelines, lubrication points, and testing and adjustments. With fully bookmarked chapters, detailed illustrations, exploded diagrams, and troubleshooting procedures, this 569-page English language manual empowers owners, mechanics, and technicians to ensure optimal performance and extend the service life of the equipment.