This manual provides comprehensive service and repair instructions for the Daewoo Doosan 300LC-V excavator. It includes detailed procedures for diagnosing, troubleshooting, and repairing major systems and components, such as the engine, hydraulic system, electrical system, undercarriage, and attachments. The manual offers step-by-step guidance for disassembly, inspection, reassembly, and adjustment of parts. It also includes maintenance schedules, technical specifications, and safety guidelines. This document is crucial for mechanics and technicians to ensure proper maintenance, efficient repairs, and optimal performance of the 300LC-V excavator.