The Caterpillar GC40K is a robust forklift lift truck designed for efficient material handling. Featuring an internal combustion engine that operates on dual-fuel propane and gasoline, it offers versatility in various operational environments. This model is engineered for reliability and performance, with a standard operator compartment, power steering, and hydraulic lifting controls. Its construction includes essential safety features such as a seat belt and an overhead guard, ensuring operator protection during operation. The GC40K is built to handle demanding tasks, with a lift capacity of approximately 4000 kg (8800 lbs). This Service Repair Manual provides comprehensive guidance for the Caterpillar GC40K. It covers essential maintenance procedures, detailed troubleshooting steps, and critical technical specifications necessary for keeping the forklift in optimal working condition. The manual is intended for technicians, mechanics, and users, offering the information required to perform routine servicing, identify and resolve issues, and understand the vehicle's systems. By following the procedures outlined within, owners and operators can ensure the longevity, safety, and peak performance of their GC40K forklift.