John Deere 4020: Features and Specs (Review)

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John Deere tractors are known worldwide for their high-quality and user-friendly tractors and lawnmowers.

They have been making tractors for over a century now, but the one that became very popular was a John Deere 4020.

If you are looking for a mid-sized and all-rounder tractor that will fulfill all your requirements, then this model of John Deere is all you need.

John Deere 4020 replaced the John Deere 40100 tractors and came into the market with improved engines in terms of power and economic efficiency.

John Deere 4020 is a part of the new generation series and is classified as a row-crop tractor. It ranks as one of the most sold models of John Deere, with over 180,000 tractors sold. Some of these can still be seen at work in the North American fields.

If you are searching for a detailed review of John Deere 4020, you are just at the right place.

In this article, you will find an in-depth analysis and review of the John Deere 4020, along with its pros and cons and features that make this model stand out.

About John Deere 4020

About John Deere 4020

John Deere 4020 is a very popular agricultural tractor, bought by many farmers for their field works, and is still used by many around the world.

John Deere 4020 replaced the John Deere 4010 tractor model and was launched with improved engine technology, which increased its power output.

John Deere 4020 was manufactured in its Waterloo, Iowa, USA manufacturing plant, and some were made in Mexico from 1963 to 1972. John Deere introduced different variants of this model, including standard (4020S), row-crop (4020), high-crop (4020HC), and industrial (600) tractors.

Originally, when the John Deere 4020 was launched, it came as a 2-wheel drive tractor. Still, they found an optional 4-wheel drive during the lateral parts of the production year.

John Deere 4020 had a diesel fuel engine in most numbers. Still, the company also launched its gasoline and LP gas variant engine.

The diesel engine was way more efficient than the gasoline one, as you can get more power output for the lower fuel cost in diesel engines than gasoline ones.

This is also one of the reasons why diesel engine was sold heavily, around 160,000 compared to gasoline engine, as only 8,000 were sold.

All three grades were powered by a six-cylinder engine, producing just over 95 hp output.

Pricing of John Deere 4020 was on the higher side as the original price ranged around $10,345 in 1972.

It provides power steering, hydraulic wet disc brakes, and an open operator station with an optional cab.

John Deere 4020 serial numbers during the different manufacturing years were:

  • 1964 65000
  • 1965 91000
  • 1966 119000
  • 1967 145660
  • 1968 173982
  • 1969 201000
  • 1970 222160
  • 1971 250000
  • 1972 260791
  • Final 270288

In this model, the serial number plate is on the rear of the 4020 transmission case of the tractor.

Specs of John Deere 4020

General Specifications:
ModelJohn Deere 4020
ManufacturerJohn Deere
TypeRow-Crop tractor
SeriesNew Generation Series
Length (overall)151 inches
Weight8,225 lbs to 13,980 lbs
Wheel Base100.25 in
Width89.6 inches
HeightRow-crop: (77.9 in)
Standard: (78 in)
Front TiresAg: 6.00-16 (row crop); 7.50-18 (standard)
Rear TiresAg: 15.5-38 (row crop); 18.4-34 (standard)
Engine Specifications:
Engine Manufacturer/ modelJohn Deere
Engine typeFour-stroke, liquid-cooled, inline
Engine Power (Gross)N/A
No. of cylinders6
Bore and stroke4.25 in X 4.25 in
Displacement362 cu·in
PTO (claimed)N/A
Compression ratioGas: 7.5:1
LPG: 9.0:1
Starter volt12
Cooling SystemN/A
Rated RPM2200
Operating RPM1500-2200
Fuel typeGasoline / LPG
Air cleanerN/A
Fuel systemN/A
Fuel tank capacityDiesel/gasoline: 128.7 liters
LPG: 170.2 liters
Charging systemN/A
Charging ampN/A
Battery CCAN/A
Rear PTO (Power take-off shaft)N/A
Rear RPM540/1000
Engine RPM540@1900
Engine RPM1000@1900
Transmission & Chassis:
Transmission TypeFull power shift
Oil Capacity8.5 L
Coolant capacity22.7 L
BrakesHydraulic wet disc
Gears8 forward and 2 reverse
Cruise controlN/A
Steering typePower
Differential lockN/A
Operator system
Chassis4×2 2WD or 4×4 HFWD 4WD
SpeedForward: 30.9 kmh (19.2 mph) Reverse: 8.4 (5.2 mph)
TypeClosed center
Pressure2,250 psi
CapacitySyncro-Range: 37.9 L
Power Shift: 45.4 L
Rear valvesN/A
Mid valvesN/A
Total flowN/A
Tractor Hitch:
Rear typeII
Rear lift3790 lbs
Attachments (optional):
Mower deckN/A
Manufacturing locationWaterloo, Iowa, USA
Production years1963 - 1972
Price$10,345 in 1972

Features of John Deere 4020

1. Engine

The John Deere 4020 model had three variants of engine, diesel, gasoline, and LPG, all of which were four-stroke, liquid-cooled, inline six-cylinder engines and featured eight forward speeds as well as two reverse speed gears.

The John Deere 6.6 L, 6,620 cm2, (404 cu·in) six-cylinder diesel engine has 108.0 mm (4.25 in) of cylinder bore and 121.0 mm (4.76 in) of piston stroke. The compression ratio rating is 16.5:1. Diesel engine has 128.7 liters (34 US gal.; 28.3 Imp. gal) fuel tank.

The John Deere 5.6 L, 5,570 cm2, (340 cu·in) six-cylinder LPG / gasoline engine with 108.0 mm (4.25 in) of cylinder bore and 102.0 mm (4.00 in) of piston stroke. The compression ratio rating is 7.5:1. This is an original gasoline / LP-gas engine used throughout the 1965 model year.

The John Deere 5.9 L, 5,930 cm2, (362 cu·in) six-cylinder LPG / gasoline engine with 108.0 mm (4.25 in) of cylinder bore and 108.0 mm (4.25 in) of piston stroke. The compression ratio is 7.5:1 for the gasoline version and 9.0:1 for the LPG version.

2. Transmission

John Deere 4020 comes with two transmission models; one is standard, and the other is optional.

The Syncro Range transmission is the standard transmission model of the John Deere 4020. It has an 8F/2R partially synchronized gearbox type, eight forward gears, and two reverse gears. It has an oil capacity of 40.1 quarts or 37.9 liters.

The maximum forward speed in this transmission model is 19.2 mph or 30.9 kph which can go in reverse at a maximum reverse speed, of 5.2 mph or 8.4 kph.

The optional transmission system of John Deere 4020 offers a PowerShift transmission type, an 8F/4R full power shift gearbox type, eight forward gears, and four reverse gears. It can carry oil up to 56.3 quarts or 53.1 liters.

The maximum forward speed recorded in this model is 20.5 mph or 33.0 kph. While reversing, it can go up to 4.9 mph or 7.9 kph.

3. Chassis

The chassis of the John Deere 4020 presents an open operator station in which the operator has the option of a cab.

It has a two-wheel driving convenience with a power steering wheel and a variant offering a 4-wheel drive.

It is equipped with a hydraulic wet disc braking system and the inclusion of a differential lock.

4. Attachments

John Deere 4020 offers different variants of loaders that are compatible with the tractor, enabling different types of fieldwork to be done quickly.

Different types of attachments that can be added to the John Deere 4020 are John Deere 148 loader, 158 loader, and 48 loader.

Pros and Cons of John Deere 4020 Tractor

Before making a decision, it is essential to acknowledge the benefits the tractor offers and know about any disadvantages of having it in your garage.

Let us look at some pros and cons of the John Deere 4020



The John Deere 4020 is known for its manufacturing quality and durability. Many of these tractors are still used today without a lot of major issues, a testament to their longevity.


It is an adaptable tractor suitable for various agricultural tasks. It can handle plowing, tilling, planting, mowing, and more, making it a valuable tool for farmers.


These tractors are known for their dependability and low keeping requirements. With proper care, they can provide years of trouble-free operation.

Hydraulic System

The John Deere 4020 was one of the first tractors to feature a fully independent hydraulic system, allowing various hydraulic attachments and implements to be used.


For its time, the John Deere 4020 tractor offered a relatively comfortable and spacious operator’s station, which improved over earlier tractor models.


Old Age

One of the most notable drawbacks of the John Deere 4020 tractor is its age. For this old-school tractor, finding replacement parts can be challenging, and they may be more expensive than parts for some newer tractors.

Fuel Efficiency

Compared to modern tractors, the John Deere 4020 is not as fuel-efficient. It can consume a significant amount of fuel, which can concern those looking to reduce operating costs.


One major cons of this John Deere 4020 tractor is it is a more aged tractor and hence it may cause a lot of noise as well as air pollution during its operations.


As John Deere 4020 replaced the 4010 model, it came with a lot of improvements, which inflated the price.

The price of the John Deere 4020 tractor in the year 1972 was around $10,345, despite the selling of the model-created records.


What fuel type does John Deere 4020 take?

John Deere 4020 allows three types of fuel in its engine. Depending on the model’s variant, it can take diesel, gasoline, and LPG as fuels.

Where can we find the serial number of the John Deere 4020?

You can find the serial number plate of the tractor on the rear of the John Deere 4020 transmission case.

What is the horsepower of the John Deere 4020?

The John Deere 4020 has a rated engine horsepower of 91 horsepower (68 kW) and can generate a maximum power output of 100 horsepower (75 kW).


To summarise, the John Deere 4020 tractor is one of the most durable and powerful tractors of all time. It comes in a variety of fuel-type options and can be used according to your needs.

However, old age is one factor that is a matter of concern, which makes maintenance a tough ask. Also, its pollution-causing attribute must be addressed.

You can depend on this big boy for all your work, and just a little care will ensure it stays with you for eternity.

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