This manual covers the Komatsu WA450-6 and WA480-6 (KA SPEC.) Wheel Loaders, designed for robust performance in demanding environments. These machines are engineered for reliability and efficiency, offering powerful operational capabilities. The WA450-6 models are identified by serial numbers 66001 and up, while the WA480-6 models begin with serial number 85001 and up. This service shop repair manual, provided in English, is an essential resource for understanding and maintaining these high-quality pieces of equipment. The purpose of this comprehensive manual is to provide detailed information for the maintenance and repair of the Komatsu WA450-6 and WA480-6 Wheel Loaders. It includes an index, foreword, specifications, structure and maintenance standards, standard value tables, testing and adjusting procedures, troubleshooting guides, disassembly and assembly instructions, and diagrams. With 1596 pages of content, it is designed to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of their equipment through accurate procedures and technical data.