This Workshop Service Repair Manual provides comprehensive information for the Thomas 173 HL S II Series Skid Steer Loader, designed for robust performance and reliability in demanding environments. Engineered with a focus on durability and operational efficiency, this skid steer loader is built to handle a wide range of tasks. Its hydrostatic drive system ensures smooth power delivery and precise control, making it an invaluable asset for construction, landscaping, and material handling applications. The quality of engineering and the inherent reliability of the Thomas 173 HL S II Series are supported by detailed technical documentation. The purpose of this English-language manual is to serve as a definitive guide for the service and repair of the Thomas 173 HL S II Series Skid Steer Loader, covering serial numbers LK000930-Onward. It details critical systems including the Hydraulic System, Hydrostatic Drive System, Final Drive, Controls, Electrical components, Main Frame, and Engine. Additionally, it provides essential Maintenance & Specifications. With high-quality diagrams and instructions, this manual empowers owners, mechanics, and technicians to perform routine maintenance, diagnose issues, and execute repairs effectively, ensuring the continued optimal performance and longevity of the equipment.