The Komatsu WA450-3MC Wheel Loader, designed for demanding operational environments, represents a robust and reliable piece of heavy machinery. Equipped with a powerful Komatsu SAA6D125E-3 turbocharged, intercooled diesel engine displacing 11.04 L and delivering up to 232 HP, this machine is engineered for efficiency and durability. Its Hydroshift power shift transmission with 4 forward and 4 reverse gears, coupled with a standard bucket capacity of 3.9 m³, makes it suitable for a wide range of material handling tasks. With an operating weight of 23,740 kg and impressive dimensions, including a maximum dump height of 2,925 mm, the WA450-3MC is built to perform consistently under challenging conditions. This comprehensive Service Repair Workshop Manual provides detailed information for the maintenance and repair of the Komatsu WA450-3MC Wheel Loader, covering serial numbers A31001 and up, and A35001 and up. The manual is presented in English and contains hundreds of pages of official factory information. It includes essential sections on foreword, general information, structure, function, testing, adjusting, troubleshooting, disassembly, assembly, maintenance standards, and other critical topics. This resource is invaluable for owners, mechanics, and technicians seeking to ensure the optimal performance, longevity, and safe operation of their WA450-3MC by offering thorough guidance on all aspects of its service and repair.