This manual covers the Komatsu WA600-3LK Wheel Loader, serial number A53001 and up. Engineered for heavy equipment applications, this machine is designed for robust performance and reliability in demanding environments. Notable features include the E.C.S.S. (Electronic Controlled Suspension System), Joystick Steering System, and Ground Driven Steering, enhancing operational efficiency and user control. The WA600-3LK is built to provide effective, economical, and safe operation and maintenance, making it a dependable choice for various industrial and construction tasks. This comprehensive Service Repair Manual and Operation & Maintenance Manual provides detailed guidance for the Komatsu WA600-3LK. It covers essential areas such as maintenance standards, periodic replacement of safety-critical parts, and maintenance schedules, along with lubrication guidance and standard tightening torque specifications. The manual also includes troubleshooting procedures to help identify and resolve issues without requiring extensive servicing. Its structured content, including sections on structure and function, testing, disassembly, assembly, and other operational details, ensures that owners, mechanics, and technicians have the necessary information to maintain, service, and operate the wheel loader effectively and safely.