This service manual provides comprehensive information for the Nissan Forklift Internal Combustion J01 and J02 Series, covering essential engine variants including the H15, H20-II, H25 LPG, and TD27, BD30 Gasoline engines. These forklifts are engineered for reliability and efficiency in demanding industrial environments. This manual is designed to be an indispensable resource for understanding and maintaining the robust performance of your Nissan forklift, ensuring its continued operational excellence through detailed guidance and clear instructions. The scope of this manual encompasses a wide range of critical systems and components. It includes detailed sections on general information, maintenance procedures, clutch, transmissions, axles, brake and steering systems, hydraulic operations, loading mechanisms, body and frame, and electrical systems. For the engines, specific coverage is provided for general engine information, electrical systems, fuel, mechanical aspects, removal, tune-up procedures, control systems, and lubrication and cooling. This manual is intended to empower owners, technicians, and mechanics with the knowledge required for effective servicing and repair.