The Case IH 1390 is a robust agricultural tractor, part of Case IH's esteemed utility line, known for its durability and reliability in demanding farming operations. Likely produced in the 1980s, this diesel-powered machine is engineered for versatility, offering dependable performance for a wide range of farm tasks. Its design prioritizes functionality and longevity, reflecting Case IH's long-standing heritage in agricultural equipment manufacturing. This model embodies the brand's commitment to providing powerful and efficient solutions for farm owners, mechanics, and DIY enthusiasts seeking to maintain their equipment and ensure self-sufficiency. This Workshop Service Manual (WSM) provides comprehensive guidance for the service, repair, and routine maintenance of the Case IH 1390. It covers essential systems including the engine, transmission, hydraulics, electrical system, drivetrain, braking, steering, cooling, and fuel systems. Detailed procedures for routine maintenance, troubleshooting, component replacement, and major overhauls are included, supported by pictures and wiring diagrams. The manual is designed to empower farm owners and technicians with the knowledge necessary to keep the tractor in optimal working condition, saving money on repairs and ensuring its continued operational effectiveness.