John Deere 8420

Name: John Deere 8420
Brand: John Deere

Power

284 hp

Production

2002-2005

Transmission

John Deere PowerShift

Drive

4WD

Over 200 HP 2000s

From the same series:

8320

8520

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."

Introduction

Production Information of John Deere, 8420

The production information of the tractor (8420) includes details about its manufacturing.

Row-Crop tractor

Built in Waterloo, Iowa, USA


Manufacturer	John Deere

Dimension and Tires Information of John Deere, 8420

This section sums up the dimension and tires information of the tractor.


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]
	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

Get the specifications for the engine and if different options are available.

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, 8420Y

Discover all variants of transmission available for this tractor model.

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
	158.4 qts (ILS) [149.9 L]
Gears	16 forward and 4 reverse

Mechanical Specs of John Deere, 8420Y

This section summarizes all mechanical information such as the brake system and other specifications.

Four-wheel drive

Cab standard.

Hydraulic wet disc brakes


Trailer brakes	Hydraulic OptOptional
Steering	Hydrostatic power

Power Information of John Deere, 8420Y

Discover the power specifications and options available for this tractor model but also PTO (Power Take-off) information.


Rear PTO	Independent
Engine RPM	540@1975
	540/1000 (1.375 optional)
Clutch	Hydraulic wet discs
	1000@2200
Rear PTO Type	1000 (1.75)

Hydraulics Specifications of John Deere, 8420

Hydraulic system type, pressure, pump flow and valves.


Total flow	33.5 gpm*With standard 45cc pump [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]
	42.5 gpm*Optional 57cc pump [160.9 lpm]
SCV flow	30 gpm [113.6 lpm]
ILS Capacity	39.6 gal [149.9 L]

Three-Point Hitch of John Deere, 8420

Hitch category and rear/front lift capacity.


Rear Type	III/IIIN
Front lift	11000 lbs [4989 kg]
Front Hitch	IIIN OptOptional
Rear lift	15180 lbs [6885 kg]
	17300 lbsOptOptional [7847 kg]

Electrical System of John Deere, 8420

Battery voltage, charging system and ground.


Ground	Negative
Battery CCA	925
Batteries	2
Charging system	Alternator
Battery volts	12
Charging amps	150

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.

More John Deere models

8420T284 HP · 2002 - 2005 8285R285 HP · 2011 - 2013 8R 280280 HP · 2019 -7280R280 HP · 2011 - 2013 9120280 HP · 2002 - 2007 WA-17280 HP · 1968 - 1970 7R 290290 HP · 2019 -7290R290 HP · 2014 - 2019

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