This manual covers the Komatsu WA120-1 LC Wheel Loader, serial numbers 20001 and up. Designed for demanding service and repair applications, this robust machine embodies Komatsu's commitment to engineering excellence and operational reliability. Its advanced design and construction ensure efficient performance across a wide range of tasks, making it a valuable asset for any operation requiring dependable heavy equipment. The purpose of this comprehensive Shop Service Repair Manual is to provide detailed information for the maintenance and repair of your Komatsu WA120-1 LC Wheel Loader. It includes in-depth coverage of the engine, powertrain, steering, brake, work equipment, and electrical systems. This manual is an essential resource for owners, mechanics, and technicians, offering clear instructions and technical specifications to ensure the longevity and optimal performance of the equipment.