This manual covers the Thomas 135, 137, and 153 Skid Steer Loaders, designed for general construction and material handling tasks. These machines are engineered for reliability and efficiency, featuring a robust hydrostatic drive system and a powerful final drive transmission. The comprehensive design ensures optimal performance across a variety of demanding work environments, making them a dependable choice for professionals. This Parts Catalog provides detailed information for maintaining and repairing your Thomas Skid Steer Loader. It includes comprehensive coverage of the Main Frame, Controls, Final Drive Transmission, Hydraulic System, Hydrostatic Drive System, Electrical System, Engine Equipment, and Optional Equipment. With easy-to-read text, top-quality diagrams, and highly detailed exploded pictures, this manual offers step-by-step instructions based on complete disassembly, empowering owners and technicians to effectively manage their equipment.