This service repair manual provides comprehensive information for the Caterpillar GC55K STR Forklift Lift Truck. Engineered for demanding industrial applications, this model is designed to offer robust performance and reliable operation. Its substantial lift capacity of 5500 kg (12125 lbs) makes it suitable for heavy-duty material handling tasks. The forklift is equipped with an internal combustion engine, likely running on Propane (LP Gas) or Diesel, and features an automatic transmission for smooth operation. Safety is a key consideration, with features such as an Operator Presence System, Tilt Lock, Load Backrest Extension, lights, and a horn integrated into its design. This manual serves as an essential resource for maintaining and repairing your Caterpillar GC55K STR. It covers a wide range of topics, including detailed maintenance procedures, troubleshooting guides, and essential technical specifications. Owners, technicians, and mechanics will find the information within invaluable for ensuring the longevity and optimal performance of the forklift. The manual details routine maintenance schedules, such as engine oil service intervals and recommended hydraulic oil types, alongside other critical operational and technical data necessary for effective service.