Description
The Belarus 420A is an agricultural tractor certified under Nebraska Tractor Test #1255. It is powered by a 57 hp (42.5 kW) Vladimir Tractor Plant (VTZ) engine with 253 cu in (4150 ml) displacement paired with a 11-Speed Sliding Gear.
settings 2WD / 4WD verified Nebraska Tested #1949 bolt Mid-Size Utility
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Belarus 420A
Engine Power57 hp (42.5 kW)
Drive Type2WD / 4WD
Weight6,835 lb (3,100 kg)
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Implement Compatibility & Attachments
Compatibility depends on the engine output (57 hp (42.5 kW)) and structural class of the tractor. Based on these specifications, the Belarus 420A is optimally matched with:
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Rotavators (Rotary Tillers)
Recommended Size: Medium Duty Rotavator (1.5m - 1.8m)
View Compatible Rotavators agriculture
Matching Draft Attachments
- Plough: 2 Bottom MB Plough
- Harrow: 14-16 Disc Harrow
- Hitch Class: Category 2
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Engine Specifications
| Specification | Value |
|---|---|
| Manufacturer | Vladimir Tractor Plant (VTZ) |
| Cylinders | 4 |
| Displacement | 253 cu in (4150 ml) |
| Rated power | 57 hp (42.5 kW) |
| Rated RPM | 2000 RPM |
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Transmission and PTO
| Specification | Value |
|---|---|
| Type | 11-Speed Sliding Gear |
| Gears | 11 Forward / 8 Reverse |
| Max power (PTO) | 48.2 hp (35.9 kW) |
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Dimensions and Tires
| Specification | Value |
|---|---|
| Weight | 6,835 lb (3,100 kg) |
| Wheelbase | 84.6" (2150 mm) |
| Front Tires | 8.3-20 MFWD |
| Rear Tires | 13.6-38 |
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Fluid Capacities & Maintenance Specifications
| Service Item / Fluid System | Recommended Specification & Capacity |
|---|---|
| Engine Oil Capacity | 9.5 L (2.5 US gal) |
| Recommended Engine Oil Grade | 15W-40 Heavy Duty Diesel (API CK-4 / CJ-4 specification) |
| Fuel Tank Capacity | 95 L (25.1 US gal) |
| Cooling System Capacity | 15.1 L (4.0 US gal) (50/50 Heavy Duty OAT Ethylene Glycol) |
| Transmission & Hydraulic Fluid | 45 L (11.9 US gal) — Universal Tractor Transmission Oil (UTTO / ISO VG 46 / SAE 80W) |
| Engine Oil & Filter Service Interval | Every 250 – 500 operating hours (annual minimum) |
| Hydraulic & Transmission Filter Interval | Every 500 – 1,000 operating hours |
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Recommended Maintenance Schedule & Service Checklist
Regular preventive maintenance ensures peak engine efficiency, prevents hydraulic valve cavitation, and maximizes the service life of the Belarus 420A.
| Interval | Service System / Component | Required Action & OEM Specification |
|---|---|---|
| Daily / 10h | Engine & Cooling Check | Inspect engine oil dipstick level; inspect coolant recovery reservoir; clean radiator debris screen and air intake pre-cleaner. |
| 50 Hours | Break-In & Chassis Lubrication | Grease all 3-point hitch lift linkage, steering cylinder ball joints, and MFWD kingpin grease zerks using NLGI #2 Lithium EP grease. Re-torque wheel lug bolts. |
| 250 Hours | Engine Oil & Filter Service | Drain and replace engine crankcase oil (9.5 L (2.5 US gal)) using API CK-4 15W-40 heavy-duty diesel oil. Spin on new OEM full-flow engine oil filter. Inspect fan drive belt tension. |
| 500 Hours | Fuel Delivery & Filtration | Replace primary fuel filter/water separator element and secondary spin-on fuel filter. Drain water trap bowl. Inspect primary engine air cleaner filter element. |
| 500 Hours | Front Axle & Hubs (MFWD / 4WD) | Check oil level in front axle differential housing and both planetary final drive wheel hubs. Top off with 80W-90 GL-5 gear lubricant if required. |
| 1,000 Hours | Hydraulic & Transmission Filtration | Replace main transmission hydraulic pressure and return oil filters. Inspect hydraulic remote couplers (SCVs) for seal leakage. Inspect cabin fresh air and recirculation filters. |
| 1,000 Hours | Engine Valve Lash & Belts | Check and adjust intake/exhaust valve rocker clearance to factory specification. Inspect serpentine drive belt and automatic tensioner pulley bearing. |
| 2,000 Hours | Hydraulic Reservoir Drain & Refill | Complete drain and refill of transmission, differential, and hydraulic reservoir (45 L (11.9 US gal)) with fresh Universal Tractor Transmission Oil (UTTO / ISO VG 46 / SAE 80W). Clean suction screen magnet. |
| 2,000 Hours | Cooling System Flush & Refill | Drain, chemical flush, and refill closed cooling system (15.1 L (4.0 US gal)) with 50/50 prediluted Organic Acid Technology (OAT) long-life heavy-duty ethylene glycol coolant. |
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Operating Tire Pressures & Ballast Guidelines
Proper tire inflation and static weight distribution are critical for the Belarus 420A to convert engine flywheel horsepower into effective drawbar pull while eliminating power hop and limiting soil compaction.
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Heavy Draft & Tillage Plowing, Deep Ripping, Discing
12 – 16 PSI (0.8 – 1.1 bar)
Maximizes tire lug ground contact patch, flexes radial sidewalls, and targets an optimal 8% to 12% wheel slip for lowest fuel burn per acre.
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Secondary Tillage & Seeding Drilling, Cultivating, Spraying
16 – 20 PSI (1.1 – 1.4 bar)
Provides firm row tracking, reduces steering wander, and balances flotation over seedbeds with minimal rolling drag.
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Road Transport & Hauling Trailer Haulage, Road Travel
22 – 28 PSI (1.5 – 1.9 bar)
Reduces pavement rolling resistance, prevents tire shoulder overheating at transport speeds (25–31 mph / 40–50 km/h), and extends tread life.
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Front Loader Operations Bale Handling, Bucket Loading
28 – 35 PSI (1.9 – 2.4 bar)
Reinforces front steer tire sidewalls against bead unseating and excessive deflection under dynamic full-bucket loader loads.
Ballasting & Weight Distribution Benchmarks
Optimal tractor performance requires an overall operating weight ratio of 110 to 135 lbs per engine horsepower (50 to 61 kg/hp) for draft work. For the Belarus 420A (~57 HP), target total field ballast weight is approximately 6,840 lbs (3,101 kg). Static weight split recommendation: 40% to 45% Front / 55% to 60% Rear.
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Pre-Purchase Used Inspection Guide for Belarus 420A
When inspecting a used Belarus 420A at a farm auction or equipment dealership, complete these 5 core mechanical evaluations to assess true machine condition before making an offer:
1
Crankcase Blow-By & Cold Start
Start the engine cold; observe exhaust color. Remove oil filler cap at operating idle: minor heat vapor is normal, but visible rhythmic vapor pulsing or oil droplet spitting indicates worn piston rings or cylinder liner scoring.
2
PowerShift / Shuttle Engagement
Cycle through all forward and reverse gears under mild braking load. Listen for delayed forward/reverse shuttle clutch lockup, harsh pressure spikes, or transmission error warning lamps on the console.
3
Hydraulic SCV & 3-Point Hitch Drift
Raise the 3-point lift arms with an implement or ballast attached, shut the engine off, and observe for downward settling (drift). Sinking faster than 1 inch per minute indicates internal cylinder seal or control valve spool bypass.
4
Front Axle & Kingpin Mechanical Play
Jack up the front axle; pry each wheel vertically with a bar to test upper and lower kingpin swivel bearings. Check front wheel hub planetary seals for gear oil weeping onto inner wheel rims.
5
Diagnostic Fault Codes & Charging
Access the instrument cluster onboard diagnostic mode to scroll through stored active and inactive fault codes. Measure battery alternator voltage at 1,500 RPM to verify proper 13.8V to 14.4V charging output.
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Field Reliability & Common Troubleshooting Guide
When servicing or operating the Belarus 420A, technicians and equipment operators report these primary diagnostic symptoms, probable root causes, and recommended field remedies:
restart_alt Engine Cranks But Refuses to Fire or Stalls Under Load
Fuel & Combustion Probable Cause:
Air entrapped in fuel injection lines following filter replacement, sticking electric fuel shutoff solenoid, or contaminated primary water separator bowl.
Recommended Field Remedy:
Pump the manual primer until firm; open bleed screws on top of the fuel filter head until air-free fuel discharges. Test 12V key-on voltage at the injection pump shutoff solenoid.
swap_driving_apps PowerShift / Shuttle Clutch Hesitation or Harsh Engagement
Transmission & Drivetrain Probable Cause:
Clutch modulation solenoid calibration drift, degraded transmission fluid viscosity, or low hydraulic charge pressure.
Recommended Field Remedy:
Run the onboard transmission electronic recalibration routine with hydraulic oil at operating temperature (50°C–60°C). Verify oil level and top off with Universal Tractor Transmission Oil (UTTO / ISO VG 46 / SAE 80W).
compress Hydraulic 3-Point Hitch Shudders or Lifts Sluggishly
Hydraulics & Implements Probable Cause:
Restricted hydraulic suction screen, aerated oil from loose suction line manifold clamps, or worn variable-displacement pump.
Recommended Field Remedy:
Inspect and replace the spin-on hydraulic suction filter element. Check reservoir fluid level (45 L (11.9 US gal)). Inspect suction rubber elbows for cracking or air ingress.
electric_meter Diagnostic Fault Codes & Low Alternator Charging Output
Electrical & Electronics Probable Cause:
Corroded main battery ground strap, loose serpentine alternator belt tension, or high resistance across cab multi-pin firewall harness connectors.
Recommended Field Remedy:
Clean battery terminals and chassis ground stud. Measure charging voltage across battery posts (must read 13.8V to 14.4V at 1,500 RPM). Check serpentine belt tension.
device_thermostat Engine Running Hot Under Heavy PTO / Draft Load
Cooling & Airflow Probable Cause:
Chaff and seed head buildup in radiator core fins, slipping fan viscous drive clutch, or sticky engine thermostat.
Recommended Field Remedy:
Slide out and blow compressed air backward through the radiator and oil cooler cores. Inspect recovery bottle (15.1 L (4.0 US gal) capacity, 50/50 OAT mixture).
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Serial Number & VIN Identification Guide
Official factory serial numbers and Vehicle Identification Numbers (VIN) designate the exact manufacturing year, assembly plant, and chassis revision for the Belarus 420A.
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Primary Stamped Location:
Stamped on the primary chassis serial plate affixed to the front axle support casting, transmission case, or operator console.
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Production Era & Model Years:
Manufactured during 1975 - 1988.
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Buyer & Technician Verification Tip:
Always cross-reference the stamped chassis number with the engine block casting numbers and the operator platform safety compliance plate to confirm matching original equipment.
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Sources and Image Rights
| Source | Use |
|---|---|
| Nebraska Tractor Test Laboratory | Official Test Report #1949 |
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Frequently Asked Questions About Belarus 420A
1. What engine is installed in the Belarus 420A?
The Belarus 420A is equipped with a D-144 4-Cylinder Air-Cooled Diesel 253 cu in (4150 ml) Engine, featuring 4 cylinders and a displacement of 253 cu in (4150 ml).
2. How much horsepower and PTO power does the Belarus 420A produce?
The Belarus 420A has a certified rated engine power of 57 hp (42.5 kW) and delivers 48.2 hp (35.9 kW) directly to the PTO shaft under laboratory dynamometer testing.
3. What is the engine oil capacity and recommended oil for the Belarus 420A?
The Belarus 420A has an engine oil capacity of approximately 9.5 L (2.5 US gal). Premium 15W-40 Heavy Duty Diesel Oil (API CK-4 / CJ-4 specification) is recommended for year-round agricultural operation.
4. Where is the serial number located on the Belarus 420A?
On the Belarus 420A, the factory serial number is Stamped on the primary chassis serial plate affixed to the front axle support casting, transmission case, or operator console.
5. What transmission is equipped on the Belarus 420A?
The Belarus 420A utilizes a 11-Speed Sliding Gear transmission configured with 11 Forward / 8 Reverse.
6. What is the certified operating weight of the Belarus 420A?
The certified unladen operating weight of the Belarus 420A is 6,835 lb (3,100 kg), which can be further ballasted for heavy tillage traction.
7. What is the official Nebraska Tractor Test report number for the Belarus 420A?
The official Nebraska Tractor Test Laboratory testing certification number for the Belarus 420A is #1949.
8. What drive configuration is used on the Belarus 420A?
The Belarus 420A features a 2WD / 4WD drivetrain engineered for agricultural field and chore work.
9. What chassis dimensions and stability features does the Belarus 420A offer?
The Belarus 420A is built on a heavy-duty chassis with a measured wheelbase of 84.6" (2150 mm), providing high stability under heavy front loader and draft loads.
10. What PTO speeds does the Belarus 420A support?
The Belarus 420A provides standard 540 / 1000 RPM PTO operation to power rotary cutters, balers, and tillers.
11. What is the hydraulic system capacity on the Belarus 420A?
The Belarus 420A is equipped with a hydraulic system delivering Standard hydraulic pump output for remote auxiliary valves and implement control.
12. What 3-point hitch capacity does the Belarus 420A offer?
The rear three-point hitch on the Belarus 420A is rated for Category standard 3-point linkage to lift heavy mounted implements.
13. What years was the Belarus 420A manufactured?
The Belarus 420A was produced during the 1975 - 1988 model years.
14. Where can I find replacement parts and service manuals for the Belarus 420A?
OEM parts, replacement filters, and workshop repair service manuals for the Belarus 420A can be found through our integrated parts lookup section.
15. What are common mechanical issues or troubleshooting points for the Belarus 420A?
Common maintenance focus areas for the Belarus 420A include bleeding the primary fuel filter to prevent injection pump airlocks, maintaining correct transmission hydraulic fluid (Universal Tractor Transmission Oil (UTTO / ISO VG 46 / SAE 80W)) to ensure smooth PowerShift and shuttle clutch calibration, and regular greasing of MFWD steering kingpins.
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