This service repair manual covers the Hyundai HLF15(C)-5 and HLF18(C)-5 forklift trucks, designed for material handling applications with lift capacities ranging from 1500 kg to 1800 kg. These forklifts are powered by LPG engines utilizing Impco LPG kits, with coverage extending to both Non-Emission and EPA Tier II compliant configurations. The manual provides comprehensive information on the engineering and operational aspects of these robust machines, emphasizing their reliability and efficiency in demanding industrial environments. This manual serves as an essential resource for Do-It-Yourselfers, service technicians, and fleet maintenance personnel. It offers detailed guidance across all major systems, including the power train, brake, steering, hydraulic, electric, and mast systems. Coverage includes general information, safety guidelines, specifications, unit removal and installation, periodic maintenance, troubleshooting, diagnostics, and repair procedures. The manual is presented in English and features high-quality diagrams to facilitate understanding and accurate execution of maintenance and repair tasks.