This Service Repair Manual provides comprehensive information for the Komatsu WA120L-3MC Wheel Loader, serial numbers 54104 and up. Engineered for reliability and performance, this heavy-duty equipment is designed to meet the demanding requirements of various operational environments. Its robust construction and advanced features ensure efficient material handling and operational longevity, making it a valuable asset for construction, mining, and landscaping applications. This manual serves as an essential resource for owners and technicians, offering detailed guidance on maintenance, repair, and troubleshooting. It covers general information, structure and function, testing and adjusting procedures, disassembly and assembly, and maintenance standards. With easy-to-follow, step-by-step instructions, high-resolution images, and top-quality diagrams, this English-language manual is an inexpensive way to keep your Komatsu WA120L-3MC Wheel Loader operating at peak performance.