The Komatsu WA420-3LE Wheel Loader, designed for demanding operational environments, represents a robust and reliable piece of heavy machinery. Built with engineering excellence, this model is intended for a wide range of material handling tasks. Its construction prioritizes durability and performance, ensuring efficient operation across various applications. The WA420-3LE is engineered to meet the rigorous standards expected in its class, offering a dependable solution for construction, mining, and other industrial sectors. This comprehensive Service Shop Repair Manual provides detailed information for the maintenance and repair of the Komatsu WA420-3LE Wheel Loader, serial numbers A30001 and up. It covers essential areas including engine components, powertrain systems, hydraulic circuits, braking, steering, cooling, and electrical systems. The manual also includes procedures for preventative maintenance, testing, adjustments, removal and installation, and troubleshooting. With detailed illustrations and exploded diagrams, this manual serves as an indispensable resource for owners, mechanics, and technicians to ensure the optimal performance and longevity of their equipment.