| Manufacturer | John Deere |
| Price | - |
| Model | 8420T |
| Equipment Type | Agricultural Crawler Tractors |
| Factory | Waterloo, Iowa, USA |
ENGINE DETAIL
The John Deere 8420T features a robust 8.1L turbocharged diesel engine, providing a rated power of 270hp (201.3kW) at 2200 RPM, making it suitable for demanding agricultural tasks. Its high maximum power output of 300hp (223.7kW) allows for effective operation under heavy load conditions, though the compression ratio of 16.5:1 may require quality fuel to optimize performance. Additionally, with a coolant capacity of 35.9 quarts (34.0L), the cooling system is well-suited for prolonged operation, but regular maintenance is necessary to prevent overheating in intensive use scenarios.
| Description | John Deere turbocharged diesel 6-cylinder liquid-cooled inline |
| Displacement | 496ci / 8.1L |
| Bore/Stroke | 4.56x5.06inches / 116x 129mm |
| Rated Power (ECE R24) | 270hp / 201.3kW |
| Rated Power (EC 97/98) | 284hp / 211.8kW |
| Maximum Power (ECE R24) | 300hp / 223.7kW |
| Maximum Power (EC 97/68) | 314hp / 234.1kW |
| Compression | 16.5:1 |
| Rated RPM | 2200 |
| Idle RPM | 900-2300 |
| Operating RPM | 1500-2200 |
| Starter volts | 12 |
| Coolant capacity | 35.9qts / 34.0L |
ENGINE OIL
The John Deere 8420T has an oil capacity of 22.7 quarts (21.5 liters) and requires an oil change every 250 hours of operation, which supports optimal engine performance and longevity. Keeping to the recommended oil change interval is crucial to prevent engine wear and maintain efficient operation, especially in demanding agricultural environments. A potential challenge may be the frequency of maintenance if the tractor is used for extended periods without interruption, necessitating careful scheduling to avoid downtime.
| Oil capacity | 22.7qts / 21.5L |
| Oil change | 250 h |
JOHN DEERE 8420T ENGINE
The John Deere 8420T features a robust 8.1L 6-cylinder diesel engine, delivering impressive torque and power for heavy-duty tasks, ideal for large-scale farming. Its tracked design provides superior traction and reduced soil compaction, making it advantageous in wet or uneven terrains. However, the initial investment may be high, and maintenance costs could be elevated due to the complexities of the track system.
| Description | John Deere 8.1L 6-cyl diesel |
TRANSMISSION
The John Deere 8420T features a John Deere PowerShift transmission, providing seamless power delivery with 16 forward and 4 reverse gears, which enhances productivity in varying field conditions. Its substantial oil capacity of 260 quarts (246.1L) ensures optimal lubrication and cooling, extending the lifespan of critical components during prolonged operation. This tractor is ideal for heavy-duty applications but may present a learning curve for operators unfamiliar with advanced transmission systems.
| Transmission | John Deere PowerShift |
| Type | full power shift |
| Gears | 16 forward and 4 reverse |
| Oil capacity | 260qts / 246.1L |
SPEEDS
| Description | Fourth reverse at 1600 RPM |
JOHN DEERE 8420T TRANSMISSION
The John Deere 8420T features a 16-speed full power shift transmission, enabling smooth and efficient gear transitions under load, which enhances productivity in varying field conditions. Its higher gear range offers flexibility for both high-speed transport and lower-speed field operations. However, the complexity of the transmission may require advanced operator training to optimize performance.
| Description | 16-speed full power shift |
MECHANICAL
The John Deere 8420T tractor features a durable crawler drive, providing enhanced traction and stability on uneven terrain, ideal for heavy tillage or fieldwork. Its electro-hydraulic power steering offers responsive maneuverability, particularly beneficial in tight spaces or during complex operations. However, the hydraulic wet disc brakes, while effective for consistent stopping power, require regular maintenance to ensure optimal performance under heavy loads.
| Drive | crawler |
| Steering | electro-hydraulic power |
| Description | Hydraulic wet disc brakes Cab standard |
CAPACITY
| Fuel | 130gal / 492.1L |
| Hydraulic system | 65gal / 246.0L |
HYDRAULICS
| Type | closed center pressure flow compensated (PFC) |
| Capacity | 65gal / 246.0L |
| Pressure | 2900psi / 200.0bar |
| Valve | 5 |
| Pump flow | 30gpm / 113.6lpm |
| Total flow | 33.5gpm / 126.8lpm 42.5gpm (optional) / 160.9lpm |
TRACTOR HITCH
| Rear Type | III/IIIN |
| Rear lift | 15,180lbs / 6885kg |
POWER TAKE-OFF (PTO)
| Rear PTO | independent |
| Rear RPM | 1000 (1-3/4) |
JOHN DEERE 8420T TRACKS
| Width | 30inches / 76cm |
| Length on ground | 89inches / 226cm |
| Area on ground | 5340in² / 3.4m² |
DIMENSIONS & TRACKS
| Wheelbase | 89inches / 226cm 120inches (wide track opt) / 304cm |
| Weight | 25950 to 26380 pounds |
| Description | 24-inch tracks |
ELECTRICAL
| Ground | negative |
| Charging system | alternator |
| Charging amps | 150 |
| Batteries | 2 |
| Battery CCA | 925 |
| Battery volts | 12 |