This manual covers the Doosan Daewoo Mega 300-V Wheel Loader, serial numbers 1001 and up, for Tier I & II emissions standards. Engineered for robust performance and reliability, the Mega 300-V is designed to handle demanding construction and material handling tasks. Its construction emphasizes durability and operational efficiency, making it a dependable choice for various industrial applications. This comprehensive service repair manual provides detailed instructions and illustrations for maintaining and repairing your Doosan Daewoo Mega 300-V Wheel Loader. It covers essential areas including safety precautions, specifications, general maintenance procedures, standard torques, and detailed sections on the upper structure, lower structure and chassis, engine and drivetrain, hydraulics, electrical system, and attachments. This guide is an invaluable resource for both experienced technicians and owners performing their own maintenance, ensuring the longevity and optimal performance of the equipment.