This service manual provides comprehensive information for the DOOSAN DAEWOO MEGA 300-V WHEEL LOADER, covering serial numbers 1001 and up, for both TIER 1 and TIER 2 emissions standards. Designed for robust performance in demanding environments, the MEGA 300-V is engineered for efficiency and durability, making it a reliable choice for heavy-duty material handling operations. Its construction emphasizes operational excellence and longevity, ensuring consistent productivity across various applications. This manual serves as an essential resource for maintaining and repairing the DOOSAN DAEWOO MEGA 300-V WHEEL LOADER. It details critical procedures, specifications, and troubleshooting guidance across a wide range of systems, including safety, general maintenance, drivetrain components, hydraulics, and the electrical system. Professionals can utilize this guide to accurately diagnose issues, perform necessary calibrations, and execute repairs, ensuring the optimal performance and extended service life of the equipment.