BELARUS MTZ 50, 80, 90, 500, 800, 900 Workshop Repair Manual (P/N TM112)

• Covers 1970s–1990s era Belarus MTZ 50, 80, 90, 500, 800, and 900 series tractors in both 2WD and 4WD configurations.
• Original OEM publication TM112 serving as the foundational reference for the MTZ workshop series.
• Features over 100 technical illustrations, exploded-view diagrams, and electrical wiring schematics detailing standard and modernized dashboard layouts.

Document Content and System Breakdown

This workshop manual details the mechanical and electrical systems across the D-50, D-240, D-242, D-243, and D-244 diesel engine platforms. You get a complete look at the engine assembly. It focuses heavily on cylinder head tolerances, valve timing adjustments, lubricating networks, and cooling system maintenance. Beyond the power plant itself, the documentation breaks down the entire drive system. Expect clear teardowns of the transmission, clutch control mechanisms, and differential lock operation for the 500 and 800/900 series.

The text dives deep into chassis, steering, and hydraulic componentry. For instance, it provides exact schematics for the Danfoss steering unit and details front axle drive engagement. You will also find comprehensive mapping of the hydraulic distributor R80-3/4-333 control valves. Working on heavy machinery carries inherent risks. Always verify load capacities, secure the tractor on appropriate stands, and relieve hydraulic pressure before opening any lines to prevent severe injury. The final sections map out the electrical grids. These diagrams trace the charging system, lighting circuits, instrument clusters, and auxiliary cab equipment.

Specification Highlights

Engine performance data is documented with absolute precision. The manual notes a standard 4.75-liter displacement across the primary diesel variants. Thermal management is critical. The documentation defines the cooling system thermostat set point exactly at 80 degrees Celsius. Lubrication pressure operates at 1.9 to 3.0 kgf/cm² (28 to 43 psi) at rated speed. Peak torque values for the D-240 variant max out at 280 N-m.