This Operation & Maintenance Manual covers the Komatsu WA320-3 and WA320-3MC Wheel Loaders, serial numbers A31001 and up. These machines are engineered for robust performance and reliability in demanding work environments. This manual is designed to provide comprehensive guidance for operating and maintaining these versatile wheel loaders, ensuring they achieve peak performance efficiently and safely. The purpose of this manual is to assist operators and maintenance personnel in achieving optimal machine performance through effective, economical, and safe operation and maintenance practices. It details essential information including operational procedures, cold weather and long-term storage guidelines, troubleshooting steps, and maintenance schedules. Furthermore, the manual includes specifications, information on optional parts and attachments, air conditioning details, and crucial safety precautions for both operation and maintenance.