This workshop service and repair manual covers the Thomas 135, 137, 153, and 1300 ProTough Skid Steer Loaders. These machines are engineered for heavy-duty construction and material handling applications, built for reliability and performance in demanding environments. Their robust design and advanced systems ensure efficient operation and longevity. This comprehensive manual provides detailed information for maintaining and repairing your Thomas Skid Steer Loader. It includes in-depth coverage of the Hydraulic System, Hydrostatic Drive System, Final Drive, Controls, Electrical system, Main Frame, and Engine. With step-by-step instructions and clear illustrations, this guide is an essential resource for owners and technicians to ensure optimal performance and longevity of the equipment.