This Field Assembly Manual covers the Komatsu WA900-3 Wheel Loader, serial numbers 50001 and up. Engineered for demanding heavy-duty applications, the WA900-3 is recognized for its robust construction and operational efficiency. This machine is designed to deliver reliable performance in challenging environments, making it a valuable asset for large-scale construction, mining, and material handling operations. Its advanced engineering ensures durability and productivity, reflecting Komatsu's commitment to quality and innovation in heavy equipment. This comprehensive manual provides detailed instructions and specifications essential for the proper assembly and initial setup of the Komatsu WA900-3 Wheel Loader. It covers all critical assembly procedures, from frame and drivetrain integration to hydraulics, operator station, and work equipment installation. Additionally, the manual includes information on planning, preparation, necessary tools, and final checks, ensuring that the machine is assembled correctly and ready for operation. This resource is intended for technicians and operators to facilitate a smooth and accurate field assembly process.