This Service Training Manual covers the Komatsu WA270-3 Wheel Loader, a robust machine engineered for demanding material handling, construction, loading, and excavation tasks. Built with Komatsu's commitment to quality and reliability, this wheel loader features a powerful Komatsu S6D102E-1 diesel engine producing 137 HP and a responsive hydrostatic transmission with four-wheel drive, ensuring efficient operation and excellent traction in various conditions. Its substantial operating weight of 17,500 kg and a wheelbase of 2,900 mm contribute to its stability and performance. This manual provides comprehensive guidance for maintaining and repairing the Komatsu WA270-3. It details essential procedures, technical specifications, and troubleshooting information necessary for optimal performance and longevity. Owners, mechanics, and technicians will find valuable insights into the machine's systems, including engine, transmission, and hydraulic components, along with recommended maintenance schedules and fluid specifications, such as the requirement for Komatsu Genuine Engine Oil or an equivalent API CF-4 or higher for the engine's 28 L oil capacity.