This service repair manual provides comprehensive technical information for the Hyundai HSL800T THOMAS Skid Steer Loader. Engineered for heavy equipment applications, this machine is designed for robust performance and reliability in demanding work environments. Its hydrostatic drive system ensures efficient power delivery and precise control, making it a versatile tool for various operational needs. This manual details the engineering and construction that contribute to the HSL800T THOMAS's reputation for durability and operational excellence. The purpose of this manual is to serve as an authoritative guide for performing repairs and maintenance on the Hyundai HSL800T THOMAS Skid Steer Loader. It covers essential areas including the hydraulic system, hydrostatic drive system, final drive, controls, electrical components, main frame, engine, and general maintenance procedures. With detailed illustrations, numbered instructions, and highlighted critical information such as notes, cautions, and warnings, this manual is an indispensable resource for owners, mechanics, and technicians. Its structured format, including a table of contents and enlarged part identification, facilitates efficient troubleshooting and accurate repair, ultimately aiding in the quality and longevity of the equipment.