The Case International 685 Tractor, produced likely between the late 1980s and early 1990s, represents a robust and reliable piece of agricultural machinery. As part of Case's established lineage of dependable farm equipment, this model is known for its solid construction and performance in demanding environments. Designed for a range of agricultural tasks, the 685 typically features a naturally aspirated or turbocharged diesel engine, a manual synchromesh transmission, and a standard Power Take-Off (PTO) system, embodying the practical engineering characteristic of its era. Its enduring presence in the field is a testament to its functional design and the manufacturer's heritage in agricultural innovation. This comprehensive Workshop Service Manual (WSM) provides in-depth guidance for the maintenance, repair, and troubleshooting of the Case International 685 Tractor. It covers all essential systems, including the engine, transmission, drivetrain, hydraulics, electrical components, brakes, and steering. The manual offers detailed procedures for routine maintenance, disassembly, assembly, and rebuilds, supported by numerous illustrations and clear wiring diagrams. Its purpose is to empower owners, mechanics, and technicians with the knowledge necessary to keep the tractor operating efficiently and to perform repairs, thereby saving on labor costs and ensuring longevity.