This manual covers the Caterpillar GP15N, GP35AN, GPE15N, GPE35AN, DP15N, and DP35AN forklift trucks, designed for robust material handling operations. These internal combustion engine-powered machines, featuring Mast MC FC chassis types, offer lift capacities ranging from 1500 kg to 3500 kg. They are engineered for reliability and efficiency in demanding industrial environments, with various engine options likely available to suit specific operational needs. The comprehensive coverage extends to specific serial number ranges, ensuring precise information for each unit. The purpose of this Service and Repair Manual is to provide detailed guidance for the maintenance, troubleshooting, and repair of these Caterpillar forklift trucks. It encompasses essential information on engine specifications, transmission systems, operational data, and safety features, including operator presence systems and braking mechanisms. Owners, technicians, and mechanics will find the necessary procedures, technical specifications, and recommended maintenance schedules within these pages to ensure the optimal performance and longevity of their equipment.