This manual covers the Komatsu WA420-3LE Wheel Loader, designed for demanding applications in loading, material handling, construction, and mining. Engineered for robust performance and reliability, this heavy equipment model offers exceptional operational efficiency. Its advanced design and durable construction ensure it meets the rigorous requirements of professional work environments, making it a trusted choice for various industrial tasks. This comprehensive Service Repair Manual and Operation & Maintenance Manual provides essential information for maintaining and repairing your Komatsu WA420-3LE. It includes detailed sections on operation guides, maintenance procedures, troubleshooting, and technical specifications. Coverage extends to optional parts and attachments, bucket and tire selection, air conditioning, ECSS, and auto-greasing systems. With detailed illustrations, exploded diagrams, and drawings, this manual is an indispensable resource for owners, mechanics, and technicians to ensure optimal performance and longevity of the equipment.