This comprehensive manual provides detailed instructions for overhauling the Gravely GMT9000 tractor's Continental engine, specifically models R800-46 and R839-46. The manual covers all aspects of the overhaul process, from disassembly and inspection to reassembly and testing. It includes step-by-step instructions, detailed diagrams, and specifications for all parts and components. With this manual, you'll have everything you need to successfully perform a complete engine overhaul, ensuring your Gravely tractor runs smoothly and reliably for years to come. The manual covers both the original 1973 edition and the subsequent revision in 1974, providing the most up-to-date information and procedures.