This manual covers the Doosan Daewoo Excavator DH Series, a line of heavy machinery engineered for demanding construction and industrial applications. The series encompasses various models, including the DH 030, DH 050, DH 130, DH 170, DH 220, DH 280, DH 320, and DH 450, with specific sub-models and serial number ranges detailed for comprehensive coverage. These excavators are designed for reliability and performance, offering robust solutions for excavation, material handling, and site preparation tasks. This comprehensive service and repair manual provides detailed electrical and hydraulic schematic information essential for maintaining and troubleshooting your Doosan Daewoo Excavator DH Series. It includes clear text, high-quality diagrams, and step-by-step instructions suitable for both novice users and experienced mechanics. The manual covers all aspects of the machine, ensuring you have the necessary technical specifications and procedures to perform repairs efficiently and correctly, mirroring the information used by professional service technicians.