This service manual covers the Nissan Forklift Internal Combustion 1D1 and 1D2 Series, including the K15, K21, and K25 Gas/LPG engines, as well as the QD32 Diesel engine. These forklifts are engineered for robust performance and reliability in demanding industrial environments. This comprehensive guide provides detailed procedures to ensure optimal operation and longevity of your equipment. The purpose of this manual is to provide owners, mechanics, and technicians with the necessary information to perform maintenance, diagnostics, and repairs. It includes step-by-step instructions, detailed diagrams, and specifications for all major systems, from the engine and transmission to the hydraulic and electrical systems. By following the procedures outlined herein, users can effectively maintain and repair their Nissan forklift.