This manual covers the Caterpillar Cat GP15N and GP18N Forklift models, designed for efficient material handling in various industrial environments. These forklifts feature robust internal combustion engines, specifically propane/LPG powered units, offering reliable performance for lifting capacities of 1500 kg (3300 lbs) for the GP15N and 1800 kg (4000 lbs) for the GP18N. Their hydrostatic transmission (HST) provides infinitely variable gear ratios for smooth operation and precise control. Engineered for durability and operator safety, these machines are equipped with features such as an operator presence system, seat belt, parking brake, and audible alarms, ensuring operational integrity and security. The purpose of this comprehensive factory service repair manual is to provide detailed technical information for the maintenance and repair of your Caterpillar Cat GP15N / GP18N Forklift. It includes easy-to-read text, high-quality diagrams, and clear instructions covering all aspects of the vehicle. Essential information on engine specifications, hydrostatic transmission, fluid capacities, service intervals, safety features, and lift capabilities are detailed within. This manual serves as an indispensable resource for owners, mechanics, and technicians to ensure the optimal performance, longevity, and safe operation of these forklifts.