This manual covers the Hyundai HLF15-5, HLF15C-5, HLF18-5, and HLF18C-5 Forklift Trucks. These robust machines are designed for material handling applications, offering lift capacities of 1500 kg and 1800 kg respectively. Engineered for reliability and efficiency, these forklifts feature internal combustion LPG engines, with specific attention given to IMPCO LPG kits that meet EPA Tier II emissions standards. The models incorporate advanced systems for power train, brakes, steering, hydraulics, and mast operation, ensuring dependable performance in demanding environments. This comprehensive workshop service repair manual provides detailed information for owners and technicians. It covers general information, safety hints, and in-depth procedures for all primary systems including the power train, brake, steering, hydraulic, electric, and mast systems. The manual includes guidance on routine maintenance, periodic component replacement, and preventive maintenance strategies to optimize longevity and reduce operational costs. Diagnostic procedures, troubleshooting guides, and specific tests and adjustments are also detailed, enabling effective repair and upkeep of the forklift trucks.