This manual covers the DOOSAN DAEWOO DX300LC HEAVY EXCAVATORS, specifically models with serial numbers 5001 and up. These excavators are engineered for demanding operational environments, offering robust performance and reliability. Their design emphasizes durability and efficiency, making them a trusted choice for heavy-duty construction and industrial applications. The purpose of this comprehensive service manual is to provide detailed information for the maintenance and repair of your DOOSAN DAEWOO DX300LC HEAVY EXCAVATORS. It includes essential procedures, technical specifications, and troubleshooting guidance to assist owners, technicians, and mechanics in ensuring the optimal performance and longevity of the equipment.