The Caterpillar GC40K STR is a robust forklift lift truck designed for demanding industrial applications. Engineered for reliability and efficient operation, this model features an internal combustion engine capable of running on either propane (LPG) or gasoline, offering operational flexibility. With a lifting capacity of 4000 kg (8818 lbs) and available with standard 2-stage or 3-stage masts, the GC40K STR is equipped to handle a wide range of material handling tasks. Its design prioritizes operator safety with standard features like an overhead guard and seatbelt, complemented by power steering for enhanced maneuverability. This Service Repair Manual provides comprehensive guidance for technicians and mechanics responsible for the maintenance and repair of the Caterpillar GC40K STR forklift. It covers essential information including detailed maintenance procedures, troubleshooting diagnostics, and technical specifications for the engine, transmission, and other critical systems. By consulting this manual, operators and service personnel can ensure the optimal performance, longevity, and safe operation of their GC40K STR lift truck through proper upkeep and timely repairs.