This manual covers the John Deere 4650 and 4850 Tractors, produced approximately between 1982 and 1987. These heavy-duty agricultural tractors were designed as row-crop specialists, featuring high horsepower engines, advanced PowerShift transmissions, and robust hydraulic systems to power demanding implements. Known for their engineering quality and reliability, these models offered spacious and comfortable cab environments for operator comfort during long workdays. The 4650 typically features an 8.1 L engine with approximately 170 PTO HP, while the larger 4850 is equipped with a 10.1 L engine delivering around 210 PTO HP. This comprehensive service repair technical workshop manual provides in-depth information for maintaining and repairing the John Deere 4650 and 4850 Tractors. It covers essential areas including engine service, transmission repair, hydraulic system diagnosis, electrical system troubleshooting, drivetrain maintenance, and braking and steering system service. The manual includes routine maintenance procedures, detailed disassembly and assembly instructions, overhaul procedures for major components, and advanced diagnostic capabilities with troubleshooting guides and special tool requirements. With over 800 pages of detailed content, including high-resolution diagrams and schematics, this English-language manual is an indispensable resource for owners, mechanics, and technicians.