![Belarus MTZ 500 800 900 Repair Manual [ Tractor ]](https://youfixthis.com/wp-content/uploads/2013/10/YouFixThis-Kawasaki-Screen-11-300x300.png)
This 241-page Belarus MTZ 50-80-90, MTZ 500-800-900 Work Shop Manual PDF strips the D50, D60, D240, D243 and D244 diesel engines and every tractor system down to bare components and rebuilds them by the book. You get full wiring harness diagrams, hydraulic schematics with spool valve positions, and torque and clearance tables for everything from piston ring gaps to differential bearings. Repair sections walk you through the clutch, gearbox, rear axle, brakes, mechanical front drive, and the complete Danfoss power steering unit, right down to O-ring installation. Set the centrifugal oil filter relief valve at 0.7 MPa (100 PSI) and check that the drain valve opens between 28 and 43 PSI. No more chasing wiring faults with a multimeter and a prayer. Bookmarked for quick jumps; pull it up on your phone in the shop and get back to work.
What's Inside This Belarus Mtz Series Manual
| System | Pages | Key Topics |
|---|---|---|
| Diesel Engines | 7-31 | Technical Data, Crankcase, Piston & Valve Mechanism, Fuel System, Cooling System, Lubricating System, Turbocharger |
| Diesel Engine Repairs | 32-47 | Cylinder Head Disassembly, Valve Seat Repair, Crankshaft Disassembly, Piston Ring Clearance, Injector Disassembly, Water Pump, Centrifugal Oil Filter |
| Drive System | 48-66 | Transmission, Clutch, PTO Drive, Rear Axle, Differential Lock |
| Chassis and Steering | 70-81 | Wheel Camber, Front Axle Drive, Intermediate Bearings, Tires & Wheels, Power Steering Unit, Danfoss Steering Unit |
| Hydraulic System | 82-95 | Hydraulic Diagram, Oil Tank & Filter, Gear Pump, Distributor, Spool Valve Positions, Draft & Position Control |
| Electrical System | 96-121 | Wiring Harness, Gauges & Instruments, Lighting & Signals, Alternator, Starter, Fuel Spray Electric Plug Heater, Horn, Safety Switch |
| Clutch and Clutch Housing (Repairs) | 122-136 | Clutch Disassembly & Assembly, Pressure Plate Flatness, Pressure Spring Tension, PTO Drive Shaft, Clutch Brake Release Hub, Release Bearing Housing |
| Gear Box (Repairs) | 137-153 | Bearing Checking, Gearshift Mechanism, Main Shaft, Intermediate Shaft, Second Gear Reducer, First & Reverse Shaft, Measuring Components |
| Rear Axle (Repairs) | 154-171 | PTO Planetary Control, Differential Lock Adjustment, Axle Shaft Carrier, Differential Lock Clutch, Differential Bearings, Final Drive Pinion, Spider Gear Thrust Washer |
| Brakes (Repairs) | 172-179 | Brake Control Linkage, Full Travel of Brake Pedals, Service Brakes, Parking Brake, Actuating Disk Flatness, Brake Disk Flatness, Spring Tension |
| Mechanical Front Drive (Repairs) | 180-197 | Toe-In Adjustment, Steering Angle, Front Axle End Play, Front Axle Hub, Steering Knuckle, Tie-Rod, Wheel Reduction Gear, Differential Assembly |
| Danfoss Power Steering (Repair Manual) | 198-228 | Tools, Dismantling Procedures, Reassembly Procedures, Spring Types, O-ring/kin-ring Installation |
| Hydraulic System (Repairs) | 229-241 | Pump Test, Hydraulic Pump Disassembly, Distributor Test, Ram Disassembly & Assembly, Draft & Position Control Adjustment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Relief valve opening pressure | 0.7 MPa, or 100 PSI | p. 27 |
| Drain valve opening pressure | 28 to 43 PSI (0.2 to 0.3 MPa) | p. 27 |
| Hydraulic cylinder diameter | 4.53 in. (115 mm) | p. 90 |
| Starter 24V | 20.3708 | p. 107 |
| 12V Storage Battery | 47 | p. 107 |
| 6V Storage Battery | 47a | p. 107 |
| Intermediate bearing friction clutch torque transmission limits | 290 to 580 ft.lbs. (41.2 to 82.5 kgf/meter) | p. 193 |
| Drive shaft yoke hole inside diameter rated value | 1.1797 to 1.1806 in. (29.965 to 29.986 mm) | p. 194 |
Belarus Mtz Series Common Problems This Manual Covers
Belarus MTZ 50-80-90 hydraulic pump leaking oil, three-point hitch slow or won't lift under load
Test pump output per the procedure on page 229 before pulling anything apart. Disassemble the pump and measure the gear pinion journals; nominal value is 1.1787 to 1.7950 in. (29.9 mm). Replace scored journals, worn seals, and cracked hoses together, then check the pivots for play while the system is drained.
Manual Section: C-9 Hydraulic System (Repairs) p. 229Engine cranks slowly or won't start, stalls immediately after firing on cold mornings
Check battery charge and clean both terminals before condemning the starter. Drain sediment from the fuel tank and replace both stage filters if the fuel looks dirty. Confirm you have the correct starter fitted, a 24.3708 for the 12V starting system or a 20.3708 for the 24V system, listed on page 118.
Manual Section: A-5 Electrical System p. 118Front drive shaft flange broken, driveline clunks and vibrates under heavy load
Remove the drive shaft and measure the sliding flange bore and shaft with a micrometer; shaft nominal diameter is 1.5685 to 1.5719 in. (39.840 to 39.925 mm) per page 195. Replace the flange if calculated clearance exceeds 0.019 in. (0.50 mm), and inspect the spider journals for wear before reassembly.
Manual Section: C-7 Mechanical Front Drive (Repairs) p. 195Oil pressure gauge drops at idle, centrifugal oil filter rotor packed with sludge
Clean the centrifugal oil filter rotor and refill with fresh oil. Test the relief valve; it must open at 100 PSI (0.7 MPa) as listed on page 27, with the drain valve opening between 28 and 43 PSI (0.2 to 0.3 MPa). Replace the rotor assembly if the bore is scored.
Manual Section: Engine Lubrication System Service p. 27Clutch slips under load, pedal engages right at the top of travel
Measure clutch pedal free travel with a rule; adjust to 1.5 to 2 inches (38 to 50 mm) following the procedure on page 135. If slipping continues after adjustment, pull the clutch and check pressure plate flatness and spring tension using the internal adjustment steps in the same section.
Manual Section: Clutch Adjustment p. 135Frequently Asked Questions
What are the torque specifications for the front wheel hub nut on MTZ 50-90 models?
When reassembling the front wheel hub, fill it with 1 lb. of grease and pack wheel bearings. Tighten the hub nut to a torque of 66.6 to 74 ft.lbs., then loosen it by 1/6 to 1/4 turn to align the slot with the hole in the knuckle shaft. p. 181
How do you adjust the hydraulic system pressure on MTZ 800 models?
The hydraulic system pressure is controlled by the safety relief valve, which prevents overload. It is adjusted by a screw for a pressure range of 2552 to 2769 PSI (180-195 kg/sq.cm). Re-adjust the safety relief valve if it is outside this recommended pressure level. p. 87
How do you adjust the hydraulic lift on MTZ 500 models?
To adjust the hydraulic lift, pull the control handle fully back (up-position of the 3-point hitch). Check the clearance between the rubber roller and the rear end of the quadrant, which should be 0.709 to 0.980 in. (18 to 24 mm). If the clearance is outside these limits, adjust it by shortening or lengthening the control rod with adjusting nuts. p. 237
What is the recommended valve clearance for engine valve adjustment?
After the first 60 hours of operation and every 500 service hours (or 6 months) thereafter, adjust the engine inlet and exhaust valve rocker arm clearance. The valve clearance should not exceed 0.012 inch (0.30 mm) for the intake or exhaust valves when the engine is still hot from operation. p. 20
What are the nominal and allowable limit specifications for the crankshaft journal diameter?
The nominal diameter for the crankshaft main journal is 2.9625 inches (-.0032 to -.0039), with an allowable limit of 2.9586 inches. For the rod journal, the nominal diameter is 2.6870 inches (-.0030 to -.0037), with an allowable limit of 2.6833 inches. p. 14
What do I get after purchasing this Belarus MTZ 50-80-90, 500-800-900 manual?
A 241-page Work Shop Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Am I able to print pages from this Belarus MTZ 50-80-90, 500-800-900 manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
