This workshop service repair manual provides comprehensive coverage for the Doosan D20S-5, D25S-5, D30S-5, D33S-5, D35C-5, G20E-5, G25E-5, G30E-5, GC20E-5, GC25E-5, GC30E-5, GC33E-5, G20P-5, G25P-5, G30P-5, and G33P-5 models. These industrial vehicles are engineered for demanding operational environments, offering robust performance and reliability. This manual ensures that owners and operators have the necessary information to maintain these machines effectively, maximizing their uptime and operational efficiency. The purpose of this manual is to serve as a complete guide for all service and repair procedures. It details every aspect of maintenance and repair from A to Z, presented with clear, step-by-step instructions and illustrations to simplify complex tasks. This resource is invaluable for anyone responsible for the upkeep of these Doosan models, enabling them to perform diagnostics, repairs, and routine maintenance with confidence and precision.