This manual covers the Hyster J006 series forklifts, specifically the H135FT and H155FT models. These internal combustion engine forklifts, classified as Class 5 with pneumatic tires, are engineered for demanding industrial applications. They feature robust construction and are designed for reliability in various operational environments. The forklifts are equipped to handle GM engines and offer fuel systems compatible with LPG and gasoline, along with three-speed and two-speed powershift transmissions. The purpose of this comprehensive Service Repair Workshop Manual is to provide detailed guidance for the maintenance, repair, and troubleshooting of your Hyster forklift. It includes essential information on general and periodic maintenance, diagnostic trouble codes, operational checkout procedures, and in-depth coverage of critical systems such as the electrical, hydraulic, cooling, steering, brake, drive axle, and mast/cylinder/frame assemblies. Technical specifications, capacities, and repair procedures for transmissions and operator cabs are also detailed, along with diagrams and schematics to assist owners, mechanics, and technicians in ensuring optimal performance and longevity of the equipment.