This workshop service repair manual covers the Komatsu WA450-3MC Wheel Loader, designed for robust performance in demanding operational environments. Built with Komatsu's renowned engineering quality and reliability, this model features a powerful Komatsu S6D125E-2 engine with a displacement of 14.1 L, delivering 202 kW of net power. Its planetary gear type, power shift transmission offers 4 forward and 4 reverse gears, complemented by a standard bucket capacity of 4.1 m³ and a rated load of 18,000 kg. This wheel loader is engineered for efficiency and durability, making it a dependable choice for various heavy-duty applications. The purpose of this comprehensive English-language manual is to provide detailed information for the maintenance, repair, and servicing of the Komatsu WA450-3MC Wheel Loader, applicable to serial numbers A31001 and up, and A35001 and up. It includes essential sections such as Foreword, General information, Structure and Function, Testing and Adjusting, Troubleshooting, Disassembly and Assembly, Maintenance Standards, and Other relevant data. This resource is invaluable for owners, mechanics, and technicians seeking to ensure optimal performance, longevity, and safety of the equipment through accurate procedures and technical specifications.