This Service Shop Repair Manual covers the Komatsu WA120-1LC Wheel Loader, serial numbers 20001 and up. Engineered for reliability and robust performance, this machine is designed to meet demanding operational needs. Its construction reflects Komatsu's commitment to quality, ensuring efficient and dependable service in various work environments. This comprehensive manual provides detailed information essential for the maintenance and repair of your WA120-1LC Wheel Loader. It includes extensive sections on the engine, power train, steering, brakes, work equipment, and electric/electronic systems, offering in-depth coverage of structure, function, testing, adjusting, disassembly, and assembly. Troubleshooting guides and maintenance standards are also included to assist owners and technicians in maintaining optimal machine performance and longevity.