This manual covers the Komatsu WA800-3E0 and WA900-3E0 wheel loaders, designed for demanding operational environments. These machines represent Komatsu's commitment to robust engineering, delivering reliability and performance for heavy-duty material handling tasks. With a focus on efficiency and durability, the WA800-3E0 and WA900-3E0 are built to meet the rigorous needs of construction, mining, and quarrying operations. The purpose of this Operation & Maintenance Manual is to provide comprehensive guidance for the effective, economical, and safe operation and maintenance of your Komatsu wheel loader. It details essential information including safety precautions, operating procedures, troubleshooting guidance, and detailed maintenance schedules and service procedures. Technical specifications, information on attachments and options, and handling instructions for various systems are also included, ensuring owners, operators, and technicians have the necessary knowledge to maintain peak performance and longevity of the equipment.