This manual covers the DX300LC, serial number 5001 and up. This equipment is engineered for robust performance and reliability, designed to meet demanding operational requirements. Its construction emphasizes durability and efficiency, making it a dependable choice for various heavy-duty applications. This comprehensive guide provides essential information for servicing the DX300LC. It details safety precautions, technical specifications, and general maintenance procedures. The manual is organized into sections covering the upper structure, lower structure and chassis, engine and drivetrain, hydraulics, electrical system, and attachments. Each section includes explanations of structure and function, testing and adjusting procedures, disassembly and assembly instructions, and maintenance standards, ensuring thorough understanding and effective repair for owners and technicians.