This manual covers TW-5, TW-15, TW-25, TW-35, 8530, 8630, 8730, and 8830 tractors, produced primarily in the 1980s and early 1990s. These tractors represent a significant period of development, incorporating advancements in transmission and hydraulic technology. They are known for their durability and performance in agricultural applications. The vehicles feature various diesel engine options, including naturally aspirated and turbocharged configurations, and offer multiple transmission types such as seven and eight-speed manual, Dual Power, and the advanced Ultra-Command Powershift transmission on later models. Safety features include robust rollover protection cabs and power brake systems. This comprehensive Factory Service Repair Workshop Manual, presented in English, is designed for owners, operators, mechanics, and repair shops. It provides detailed information for maintaining and repairing the specified tractor models. The manual covers a wide range of systems, including engine and lubrication, fuel systems, electrical systems, clutches, transmissions, power take-off, rear axle and brakes, hydraulic systems, steering, front axle, safety cabs, and accessories. It includes scheduled maintenance procedures, complete repair instructions, extensive troubleshooting guides, diagnostic procedures, overhaul instructions, and component removal/installation steps. With 1470 pages, it features detailed illustrations, exploded diagrams, drawings, photos, bookmarks, and searchable text for efficient use.