This manual covers the Thomas 173 HL S Skid Steer Loader, designed for robust performance in demanding applications. Built with engineering quality and reliability in mind, this model offers efficient operation and durability. Its advanced features and construction ensure it meets the rigorous needs of various work environments, making it a dependable choice for professionals. The purpose of this manual is to provide comprehensive guidance for the maintenance and repair of your Thomas 173 HL S Skid Steer Loader. It details essential procedures for key systems including the Main Frame, Controls, Final Drive Transmission, Hydraulic System, Hydrostatic Drive System, Electrical System, Engine Equipment, and Optional Equipment. With high-quality diagrams and instructions, this resource is invaluable for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their equipment.