This manual covers the McCormick X7.6 Series Tractors, specifically the X7.660, X7.670, and X7.680 models, all compliant with Tier 4 interim emission standards. These heavy-duty agricultural tractors are engineered for professional farmers and agricultural contractors, offering advanced engine technology for reduced emissions and a focus on operator comfort through sophisticated cab controls and programming. Built with a heritage tracing back to McCormick International and International Harvester, the X7.6 Series represents a modern evolution in high-horsepower tractor design, manufactured in Italy. This comprehensive English-language manual, spanning 400 pages, serves as an Operator's and Owner's guide. It provides detailed information on pre-operation checks, daily and scheduled maintenance, and operator training. Coverage includes the powertrain, operator interface, hydraulics, PTO, electrical system, chassis, steering, tires, wheels, and safety systems. While it offers guidance on routine maintenance and minor troubleshooting, it is operator-focused and does not delve into deep electronic diagnostics or major repair procedures, which would typically require a separate service manual. The manual is fully bookmarked, searchable, and includes an alphabetical index for efficient navigation.