This manual covers Belarus tractors, specifically the 50, 80, and 90 Series (500, 800, 900 Series). Originating from the Minsk Tractor Works, established in 1946, these tractors are known for their ruggedness, simplicity, and affordability, making them a staple in agricultural operations globally. The 50, introduced in 1961, laid the foundation for the highly successful 80 (introduced in 1974), one of the most produced tractors worldwide. Later generations, like the 90, reflect evolutionary development with more powerful engines and updated features. These tractors are powered by Belarus D-series engines, ranging from approximately 50 HP for the 50 to 95 HP for the 90, featuring direct injection fuel systems and manual transmissions with multiple gear options.

This comprehensive workshop and service manual provides essential repair and maintenance knowledge for owner-operators, farm mechanics, and service technicians. It covers all major systems, including engine overhaul, fuel injection, cooling, lubrication, drivetrain, clutch, gearbox, hydraulic systems, steering, braking, and electrical components. Detailed, step-by-step instructions are provided for maintenance tasks such as fluid changes and filter replacements, as well as complete component overhauls. The manual also includes troubleshooting guides for common issues and detailed technical specifications, tolerances, and torque values. Its scope is designed to ensure the reliable operation and longevity of these widely used agricultural machines, often in regions where direct manufacturer support may be limited.