This Service Shop Repair Manual provides comprehensive information for the Komatsu WA380-3MC wheel loader, covering serial numbers A31001 and up. Engineered for demanding work environments, this machine represents a robust solution for material handling and construction tasks. Its design prioritizes durability and operational efficiency, making it a reliable asset for various industrial applications. This manual serves as an essential guide for maintaining and repairing the Komatsu WA380-3MC. It details procedures for the engine, powertrain, hydraulic system, electrical system, cooling system, operator station, and attachments. With extensive coverage of preventative maintenance, troubleshooting, testing, adjustments, and component removal and installation, this resource is invaluable for owners, technicians, and mechanics seeking to ensure optimal performance and longevity of their equipment.