This manual pertains to the Thomas T-153 / T-135 S Series vehicles. These models represent robust engineering designed for demanding applications, embodying Thomas's commitment to reliability and performance. The S Series generation signifies advancements in their operational capabilities, making them a dependable choice for various industrial and commercial uses. Specific production years are not detailed, but the manual covers particular serial number ranges, including LN000101-LN001999 and LE008500-LE008749, ensuring precise part identification for these units. As a comprehensive Parts Manual, this document serves as an essential resource for identifying and ordering components for your Thomas T-153 / T-135 S Series vehicle. It includes detailed sections on the Main Frame, Controls, Final Drive Transmission, Hydraulic System, Hydrostatic Drive System, Electrical System, Engine Equipment, and Optional Equipment, along with a Numerical Index for quick reference. This English-language manual is designed to assist owners, technicians, and mechanics in maintaining the integrity and functionality of their equipment by providing accurate part information.