This service manual covers the Nissan Forklift Internal Combustion 1F1 and 1F2 Series, including the K15, K21, and K25 Gas/LPG engines and the QD32 Diesel engine. These forklifts are engineered for robust performance and reliability in demanding industrial environments. This comprehensive guide provides the necessary information to ensure optimal operation and longevity of your equipment. The purpose of this manual is to provide detailed maintenance and repair procedures for owners, mechanics, and technicians. It includes step-by-step instructions, diagrams, and specifications for all aspects of the forklift, from general information and routine maintenance to engine repair, hydraulic systems, and electrical components. By following the procedures outlined herein, users can effectively service, diagnose, and repair their Nissan forklift, ensuring it remains in peak working condition.