This service repair manual covers the Komatsu WA450-5L and WA480-5L wheel loaders from the 5L Series. These machines are engineered for demanding work, featuring a robust Komatsu SAA6D114E-3 turbocharged diesel engine with 11.04 liters displacement and 229 net horsepower, meeting EPA Tier 3 / EU Stage IIIa emissions standards. They are equipped with the Komatsu Advanced Hydroshift Transmission (AHSS) offering 4 forward and 4 reverse gears, ensuring efficient power delivery. The WA450-5L has an operating weight of 22,510 kg and a bucket capacity of 3.5-4.2 m³, while the WA480-5L weighs 23,970 kg with a bucket capacity of 3.8-4.5 m³. These loaders are designed for reliability and performance in various construction and material handling applications. The purpose of this comprehensive English-language service repair manual is to provide detailed information for the maintenance and repair of the specified Komatsu wheel loaders. It includes essential sections covering general information, structure and function, testing and adjusting procedures, troubleshooting guides, and detailed disassembly and assembly instructions. With high-quality diagrams and step-by-step instructions, this manual is an invaluable resource for owners, mechanics, and technicians. It facilitates proper upkeep, efficient diagnostics, and accurate repairs, ensuring the continued optimal performance and longevity of your WA450-5L and WA480-5L equipment.