This service manual covers the Komatsu WA470-5 and WA480-5 Wheel Loaders from the WA-5 Series. These robust machines are engineered for demanding industrial and construction applications, featuring powerful diesel engines, planetary-type power shift transmissions, and operator-focused cabins equipped with ROPS/FOPS certification and air conditioning. The WA470-5 offers an operating weight of approximately 23,000-24,000 kg with a 252 HP engine, while the larger WA480-5 boasts an operating weight of approximately 26,000-27,000 kg powered by a 315 HP engine. Their substantial dimensions, including a length with bucket of up to 8.0 meters and width over tires up to 3.0 meters, underscore their capability in heavy-duty material handling. The purpose of this comprehensive 1204-page English service manual is to provide detailed information for the maintenance, repair, and troubleshooting of the Komatsu WA470-5 and WA480-5 wheel loaders. It includes essential technical specifications, maintenance schedules such as engine oil changes every 500 hours and hydraulic oil changes every 2000 hours, fluid capacities, and diagnostic procedures for the engine, transmission, and hydraulic systems. This manual is an indispensable resource for owners, mechanics, and technicians, ensuring the continued optimal performance, reliability, and longevity of these powerful wheel loaders.