This workshop service repair manual covers Thomas models 135, 137, 153, and 1300 ProTough. These vehicles are engineered for robust performance and reliability, featuring a hydrostatic drive system and a comprehensive hydraulic system. While specific production years are not detailed, the manual provides extensive information to ensure these machines operate at their peak efficiency. The purpose of this English-language manual is to provide detailed guidance for the maintenance, repair, and servicing of your Thomas vehicle. It includes information on the hydraulic system, transmission, hydrostatic drive, final drive, controls, electrical systems, and main frame structure. Additionally, it covers general maintenance procedures and specifications, enabling owners and technicians to effectively manage and preserve the vehicle's functionality and longevity.