This manual covers Ford New Holland TW5, TW15, TW25, TW35, 8530, 8630, 8730, and 8830 Tractors, including multiple generations and specific models built up to and potentially after October 1985 for electrical systems and March 1990 for Ultra-Command transmissions. These tractors represent a significant lineage in agricultural machinery, known for their advanced features for their time, including robust diesel engines, sophisticated transmission options like the Ultra-Command Powershift, and integrated hydraulic systems. This comprehensive factory service repair workshop manual is designed to provide in-depth technical information essential for maintaining the performance and longevity of these powerful machines. The purpose of this 1470-page English-language manual is to serve as an authoritative resource for farmers, agricultural businesses, mechanics, and restoration specialists. It details routine maintenance, lubrication, fluid checks, filter replacements, and general servicing instructions. Furthermore, it provides step-by-step repair procedures for all major vehicle systems, including engine, fuel, electrical, drivetrain, and hydraulics, along with comprehensive troubleshooting guides and diagnostic procedures. The manual's technical depth is equivalent to official dealer service manuals, offering detailed specifications, diagrams, and explanations of special tool usage, ensuring accurate and efficient maintenance and repair for all covered models.