This manual covers the DOOSAN MEGA 300-3 DAEWOO WHEEL LOADERS, serial numbers 0001 and up. These wheel loaders are engineered for demanding operational environments, offering robust performance and reliability. Their design prioritizes efficiency and durability, making them suitable for a wide range of heavy-duty applications. This comprehensive guide details the construction and capabilities of these machines. The purpose of this service manual is to provide detailed information for the operation, maintenance, and repair of the DOOSAN MEGA 300-3 DAEWOO WHEEL LOADERS. It includes essential sections on safety, technical specifications, general maintenance procedures, and detailed repair instructions for all major systems, including the drivetrain, brakes, steering, hydraulics, and electrical systems. This manual is designed to assist both owners and professional technicians in maintaining the optimal performance and longevity of the equipment.