The Hyundai 15BT-9, 18BT-9, and 20BT-9 forklift trucks represent a line of industrial equipment designed for efficient material handling. These models, likely produced from the late 2000s to the 2010s, are built by Hyundai Heavy Industries and offer nominal lifting capacities of 1500 kg, 1800 kg, and 2000 kg respectively. They are engineered with robust internal combustion engines, typically running on LPG, Diesel, or Gasoline, and feature automatic transmissions. The forklifts are equipped with essential safety features, including operator protection systems and reliable braking mechanisms, making them suitable for demanding work environments. This comprehensive service repair workshop manual provides in-depth information for the Hyundai 15BT-9, 18BT-9, and 20BT-9 forklift trucks. It covers a wide array of critical systems, including engine service, transmission repair, hydraulic systems, electrical diagnostics, chassis and steering, braking, mast and attachments, and the operator compartment. The manual details preventive maintenance schedules, provides systematic troubleshooting guides, and offers step-by-step instructions for component replacement and rebuilding procedures. With hundreds of pages of detailed content, including photos and diagrams, this resource is essential for professional mechanics, technicians, and DIY enthusiasts aiming to maintain and repair these forklifts effectively.