This service repair manual covers the Hyundai HBF15T-5 and HBF18T-5 forklift trucks, models renowned for their robust engineering and reliability within the heavy equipment sector. Built by Hyundai Heavy Industries, a global leader with extensive experience in manufacturing durable machinery, these forklifts are designed for demanding operational environments. This manual provides comprehensive information to ensure these machines perform optimally, reflecting the brand's commitment to quality and operational efficiency. This manual serves as an essential resource for owners, technicians, and mechanics, offering detailed guidance on maintenance, troubleshooting, and repair. It encompasses all major systems, including the power train, brake, steering, hydraulic, electrical, and mast systems, providing in-depth coverage with high-quality diagrams and step-by-step instructions. The scope includes general information, specifications, periodic maintenance, component removal and installation, disassembly and assembly procedures, operational checks, and diagnostic troubleshooting, making it the most complete guide available for these specific forklift models.