This Shop Manual covers the Komatsu WA120-1LC Wheel Loader, serial numbers WA120-1LC-20001 and up. Engineered for material handling, construction, and loading applications, this heavy equipment is designed with reliability and robust performance in mind. Its diesel engine provides dependable power for demanding tasks, reflecting Komatsu's commitment to quality in its machinery. This comprehensive 569-page English manual provides essential information for maintaining and repairing your WA120-1LC. It includes detailed step-by-step repair and overhaul instructions, explanations of system and component functions, and listed specifications and tolerances. With easy-to-read text and top-quality diagrams and illustrations, this manual is an indispensable resource for owners, mechanics, and technicians to ensure optimal operation and longevity of the equipment.