This document provides the complete factory Parts Catalog manual for the Thomas 173 HLS ProTough 1700 Skid Steer Loader, designed for construction, landscaping, and material handling applications. Engineered for reliability and efficiency, this machine is built to meet the demands of tough work environments. The manual details the comprehensive engineering and quality that define the Thomas brand, ensuring users have access to the information needed to maintain and operate their equipment effectively. The purpose of this manual is to serve as an indispensable resource for owners, mechanics, and technicians. It covers all aspects of the Thomas 173 HLS ProTough 1700, including detailed exploded diagrams and step-by-step instructions for complete disassembly. Key sections include the Main Frame, Controls, Final Drive Transmission, Hydraulic System, Hydrostatic Drive System, Electrical System, Engine Equipment, and Optional Equipment, along with a Numerical Index. This catalog is designed to facilitate correct and efficient repair and maintenance.