This manual covers the Belarus 510 / 512 Tractor, produced by Minsk Tractor Works (MTW) starting in the late 1970s and early 1980s. These tractors are part of the robust and utilitarian Belarus 500 series, known for their durability, simplicity, and cost-effectiveness in agricultural applications. Designed as reliable workhorses, the 510 and 512 models typically feature a naturally aspirated, inline-four cylinder diesel engine with direct injection, a manual constant mesh gearbox with multiple forward and reverse gears, and a dry single or dual-plate clutch. Their engineering emphasizes mechanical functionality, providing essential power and capability for various farming tasks. This Operation and Service Repair Manual provides comprehensive guidance for owners, operators, and maintenance personnel. It details routine maintenance procedures, including lubrication and fluid checks, as well as in-depth repair instructions for all major systems. Coverage includes engine overhaul, fuel, cooling, lubrication, transmission, power take-off (PTO), hydraulic, steering, brake, and electrical systems. The manual offers systematic troubleshooting, disassembly and assembly instructions, and adjustment procedures, along with detailed wiring diagrams. Its expert-level technical depth is designed to empower users to maintain and repair their Belarus tractors effectively, maximizing uptime and reducing reliance on external services.