This Service Repair Manual covers the Hyundai and Mitsubishi 4G63-32HL and 4G64-33HL engines, designed for LPG Gas forklift trucks, specifically the HLF 15-5, HLF 18-5, HLF 20-5, HLF 25-5, and HLF 30-5 models. These engines are known for their robust construction and reliability in demanding industrial environments. This manual provides comprehensive information to ensure optimal performance and longevity of your forklift's power unit. The purpose of this English-language manual is to assist owners, mechanics, and technicians in maintaining, servicing, diagnosing, and repairing the specified engines. It includes detailed service specifications, tightening torques, sealant applications, engine adjustments, and a troubleshooting guide. With exploded pictures and diagrams, this manual offers essential guidance for all engine-related procedures, including work on major components like the cylinder head, crankshaft, pistons, and electrical systems.