This manual covers the Doosan Daewoo Solar 400LC-V, detailing its electrical and hydraulic systems. Designed for robust performance, the Solar 400LC-V is engineered to meet the demanding requirements of heavy-duty construction and excavation tasks. Its construction emphasizes durability and operational efficiency, making it a reliable choice for professional use. The purpose of this comprehensive manual is to provide detailed information for the maintenance, repair, and troubleshooting of the Doosan Daewoo Solar 400LC-V. It includes essential technical specifications, diagnostic procedures, and safety guidelines to ensure optimal performance and longevity of the equipment. Owners, operators, and service technicians will find this guide invaluable for understanding and managing the complex electrical and hydraulic components of this machine.