John Deere 8420
Power
284 hp
Production
2002-2005
Transmission
John Deere PowerShift
Drive
4WD
From the same series:
Introduction
John Deere 8420 Row-Crop Tractor
The John Deere 8420 is a high-horsepower row-crop tractor produced between 2002 and 2005 at the company's Waterloo, Iowa, facility. Part of the 8020 series, this machine was engineered for demanding field operations requiring significant traction and hydraulic capacity.
Engine Performance
The tractor is powered by an 8.1-liter, liquid-cooled, inline engine utilizing an electronic high-pressure common rail (HPCR) fuel system. It produces a rated net power of 284 hp (211.8 kW) at 2200 RPM, with a maximum net power output of 300 hp (223.7 kW). The engine is designed to operate efficiently across a wide power band, meeting Tier II emission standards.
Transmission and Driveline
Equipped with the John Deere PowerShift transmission, the 8420 offers 16 forward and 4 reverse gears, enabling full power shifting without the need to use the clutch during range changes. The Automatic PowerShift (APS) system allows the tractor to adjust gears automatically based on load conditions. The drivetrain features a standard four-wheel drive configuration supported by hydraulic wet disc brakes and hydrostatic power steering.
Hydraulics and Hitch
The hydraulic system utilizes a closed-center, pressure-flow compensated (PFC) design, delivering a standard total flow of 33.5 gpm (126.8 lpm), with an optional 42.5 gpm (160.9 lpm) configuration available. The system operates at 2900 psi. For implement attachment, the tractor features a Category III/IIIN rear hitch with a lift capacity of 15,180 lbs (6,885 kg), complemented by an optional 11,000 lbs (4,989 kg) front lift capacity.
PTO and Dimensions
The independent rear PTO system offers both 540 and 1000 RPM speeds, managed via hydraulic wet disc clutches. The tractor has a wheelbase of 118.9 inches (302 cm) and is available with Independent Link Suspension (ILS) to enhance ride quality and traction in varied terrain. The machine is designed for row-crop applications with adjustable tread widths.
Conclusion
The John Deere 8420 is a robust, high-performance tractor suited for large-scale farming operations that require reliable power, sophisticated hydraulic control, and the versatility of a full power shift transmission. Its design prioritizes operational efficiency and heavy-duty field capability.
Production Information of John Deere, 8420
- Row-Crop tractor
- Built in Waterloo, Iowa, USA
| Manufacturer | John Deere |
|---|
Dimension and Tires Information of John Deere, 8420
| Rack-and-pinion rear axle | 4.331 by 118.5 inches [110 by 3009 mm] |
|---|---|
| Wheelbase | 118.9 inches [302 cm] |
| Front axle | 4WD |
| Height (cab) | 122.2 inches [310 cm] |
| Height (cab)(optional) | 117.7 inches (ILS) [298 cm] |
| Rack-and-pinion rear axle | 4.724 by 118.5 inches [119 by 3009 mm] |
| Front axle | Independent Link Suspension |
| Length | 211.9 inches [538 cm] |
| ILS Front tread | 60 to 88 inches [152 to 223 cm] |
| 4WD Front tread | 60 to 80 inches [152 to 203 cm] |
| Ag front | 16.9R30 |
|---|---|
| Ag rear | 18.4R46 |
Engine Specifications of John Deere, 8420
- Liquid-cooled inline
| Idle RPM | 900-2300 |
|---|---|
| Rated RPM | 2200 |
| Rated Power (net) | 270 hp [201.3 kW] |
| Operating RPM | 1500-2200 |
| Maximum Power (net) | 300 hp [223.7 kW] |
| Maximum Power (gross) | 314 hp [234.1 kW] |
| Rated Power (gross) | 284 hp [211.8 kW] |
| Displacement | 496 ci [8.1 L] |
| Emissions | Tier II |
| Oil capacity | 28.5 qts [27.0 L] |
| Oil change | 250 h |
| Bore/Stroke | 4.56x5.06 inches [116 x 129 mm] |
| Compression | 16.5:1 |
| Starter volts | 12 |
| Coolant capacity | 35.9 qts [34.0 L] |
| Air cleaner | Dry with secondary element |
| Fuel system | Electronic high-pressure common rail (HPCR) |
Transmission Information of John Deere, 8420
Transmission variants 1
- Full power shift transmission with single shift lever with display on cab corner post. Tractor begins in 7 (forward) and 2 (reverse) on start up. Clutch pedal may be used to pre-select a gear by holding clutch and pressing lever until desired gear is reached. Automatic PowerShift (APS) allows automated shifting to match load.
| Transmission | John Deere PowerShift |
|---|---|
| Oil capacity | 148 qts [140.1 L] |
| Clutch | Hydraulic wet disc |
| Type | Full power shift |
| Type(optional) | 158.4 qts (ILS) [149.9 L] |
| Gears | 16 forward and 4 reverse |
Mechanical Specs of John Deere, 8420
- Four-wheel drive
- Cab standard.
- Hydraulic wet disc brakes
| Trailer brakes(optional) | Hydraulic |
|---|---|
| Steering | Hydrostatic power |
Power Information of John Deere, 8420
| Rear PTO | Independent |
|---|---|
| Engine RPM | 540@1975 |
| Engine RPM(optional) | 540/1000 (1.375 optional) |
| Clutch | Hydraulic wet discs |
| Clutch(optional) | 1000@2200 |
| Rear PTO Type | 1000 (1.75) |
Hydraulics Specifications of John Deere, 8420
| Total flow | 33.5 gpm [126.8 lpm] |
|---|---|
| Type | Closed center pressure-flow compensated (PFC) |
| Valves | 4 to 5 |
| Pressure | 2900 psi [200.0 bar] |
| Capacity | 37 gal [140.0 L] |
| Capacity(optional) | 42.5 gpm [160.9 lpm] |
| SCV flow | 30 gpm [113.6 lpm] |
| ILS Capacity | 39.6 gal [149.9 L] |
With standard 45cc pump
Optional 57cc pump
Three-Point Hitch of John Deere, 8420
| Rear Type | III/IIIN |
|---|---|
| Front lift | 11000 lbs [4989 kg] |
| Front Hitch(optional) | IIIN |
| Rear lift | 15180 lbs [6885 kg] |
| Rear lift(optional) | 17300 lbs [7847 kg] |
Electrical System of John Deere, 8420
| Ground | Negative |
|---|---|
| Battery CCA | 925 |
| Batteries | 2 |
| Charging system | Alternator |
| Battery volts | 12 |
| Charging amps | 150 |
Where it sits
With 284 HP, the John Deere 8420 sits between 8320 (263 HP) and 8430 (305 HP) in John Deere's range. Its power puts it in the 93th percentile of 2000s models in our database (2822 machines).
Frequently asked questions
How much horsepower does the John Deere 8420 have?
The John Deere 8420 delivers 284 HP.
What years was the John Deere 8420 produced?
The John Deere 8420 was produced in 2002-2005.
What transmission does the John Deere 8420 use?
The John Deere 8420 uses a John Deere PowerShift transmission.
Is the John Deere 8420 4WD?
The John Deere 8420 is available in 4WD.