This manual covers the Nissan Forklift Internal Combustion 1F6 Series, designed for robust industrial applications. It details various engine types, including Gas/LPG TB42, Diesel S6S, Diesel 4HK1, and Diesel 6BG, ensuring comprehensive support for different configurations. The engineering quality of these forklifts is underscored by the detailed procedures provided for their maintenance and repair, aiming to maintain their renowned reliability and operational efficiency in demanding environments. This comprehensive service manual provides detailed, step-by-step instructions and illustrations for the complete disassembly, inspection, repair, and reassembly of the Nissan Forklift Internal Combustion 1F6 Series. It covers critical systems such as the engine, drive unit, drive axle, brake system, steering system, hydraulic system, and load handling system. The manual is an essential resource for owners, mechanics, and technicians, offering guidance on troubleshooting, technical specifications, and safety precautions to ensure optimal vehicle performance and longevity.