This Service Repair Manual provides comprehensive information for the Komatsu WA450-3 and WA450-3MC Wheel Loaders, designed for material handling applications. These robust machines are powered by a Komatsu SAA6D125E-2 turbocharged, aftercooled diesel engine, delivering substantial power and efficiency. Engineered for demanding environments, the WA450-3 series features a Komatsu Advanced Transmission Electronic Control System (K-ATOMiCS) for smooth operation and a strong chassis built for reliability and productivity. With a focus on durability and performance, these wheel loaders are essential equipment for heavy-duty tasks. This manual serves as a complete guide for maintaining and repairing the Komatsu WA450-3 and WA450-3MC. It covers essential areas including detailed step-by-step repair procedures, diagnostic techniques, technical maintenance schedules, and troubleshooting guidance. Owners, mechanics, and technicians will find all necessary information, from routine servicing intervals for engine oil and hydraulic filters to in-depth system overviews and specifications. This resource is designed to ensure the optimal performance and longevity of your equipment.