John Deere 4840 Reviews: Is It Worth Investing in This Model?

Are you thinking of adding the John Deere 4840 to your equipment lineup? It can seem like a big investment and figuring out which model is suitable for you can be daunting.

That’s why we’re taking an in-depth look at this workhorse tractor today – to understand its features and capabilities and ask whether or not it’s worth investing in the John Deere 4840.

We’ll explore what sets this powerful two-wheel drive apart from similar makes and models on the market, allowing you to make an informed decision about your next purchase.

Stay tuned to learn more in this John Deere 4840 reviews about the key features of this row-crop tractor!

Take Away Key Points:

  • The John Deere 4840 is a powerful row-crop tractor that offers operator comfort, reliability, and excellent performance on the field.
  • The JD 4840 may not have an affordable price, but it is one of the best tractors of its line.
  • The tractor is an excellent investment for those looking for a rugged and dependable machine.

The History & Overview of John Deere 4840 Tractor

is a john deere 4840 a good tractor

The John Deere 4840 row crop tractor was released as part of the Iron Horse line and produced between 1978 and 1982. It is a row-crop tractor with a maximum output power of 200.0 HP, allowing farmers to undertake large workloads effortlessly.

In addition, the tractor features an overhead valve 6-cylinder engine and a two-door sound gard cab, ensuring operator comfort. With dual remotes on the rear and a spacious hydraulic oil tank, this tractor is designed for the comfort and convenience of farmers. Thanks to its air conditioning and high visibility, farmers can easily work on sunny days.

The tractor also offers added protection against dust particles due to its rotary air pre-cleaner element, which increases engine life span and reduces downtime due to maintenance costs.

Overall, the John Deere 4840 tractor is an ideal investment for farmers looking for quality and reliable power from their tractors.

Key Specifications

  • Model: John Deere 4840
  • Wheelbase: 118.1 in
  • Fuel tank capacity: 390.0 liters
  • Battery: 2 x 6V
  • Cabin type: Sound-Gard Cab

John Deere 4840 Engine

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The tractor that powers the John Deere 4840 tractor is an engine custom-made by John Deere and offers the highest productivity levels with maximum efficiency. Its 7.6-liter engine oil capacity is spread out over six cylinders. Plus, the fuel tank holds over 100 gallons so that you can spend more time in the field without a refill brake.

Moreover, the John Deere engine utilizes an intercooled turbocharger to reach a maximum power output of 181 hp. This ensures that even the toughest jobs are made easier using the tractor with any heavy material, ensuring no slow down on rugged terrain.

The dual paper air filter not only removes dust or any other forms of debris but also reduces the tractor’s wear and tear by not letting it during unnecessary friction caused by particles in its intake.

Plus, the large cooling system can store up to 37.9 liters of water which keeps the tractor from overheating due to long extended usage periods during hot weather.

Thus, the John Deere 4840 tractor engine is designed very efficiently, allowing for a durable tractor performance with maximum power.

Engine Specs

Engine typeFour-stroke, liquid-cooled, inline
Number of cylinders6
Fuel typeDiesel
Displacement466.0 cu·in
Cylinder bore and stroke4.57 in x 4.76 in
Compression ratio15.5:1
Horsepower200.0 HP
Coolant capacity37.9 L
Rated Engine Speed2200rpm
Idle Speed800-2400rpm
Firing Order1-5-3-6-2-4
Fuel SystemDirect injection
Air CleanerDual dry element
Engine oil capacity19.9L

John Deere 4840 Transmisssion

The PowerShift transmission of the John Deere 4840 row crop tractor is essential for powering its tractor wheels. This transmission provides 8 speeds going forwards and 4 speeds in reverse, which allows users to operate the tractor at speeds up to 29.9 kph (18.6 mph) moving forward and 10.3 kmh (6.4 mph) in reverse.

The John Deere tractor has differential hydraulic wet disc brakes that use hydraulic pressure. This means the brakes always work, even when the engine is off. This is helpful because it means you can stop quickly if you need to.

This powertrain is exceptionally beneficial for tractor owners because it gives them a lot of control over their tractor’s speed and torque settings, allowing them to adjust the tractor to whatever application or terrain they’re working on without having to stop and shift or change gears manually.

Moreover, its automatic power steering ensures that tractor operators can shift quickly between gears as needed with minimal effort and maximum convenience. This makes the John Deere 4840 tractor an optimal choice for anyone needing exceptional performance and easy operation.

Transmission Specs

Chassis4×2 2WD
Steering typePower shift transmission
Differential lockPedal-actuated hydraulic
Transmission modelJohn Deere PowerShift
Transmission typeFull power shift gears
BrakesDifferential hydraulic wet disc
Gears8 forward and 4 reverse
Speed Forward29.9 kmh Reverse: 10.3kmh
Transmission oil capacity75.7 L

John Deere 4840 Hydraulic System

how much horsepower does a john deere 4840 have

The John Deere 4840 row crop tractor is the perfect all-around tractor for farmers and agriculture workers, with its rugged design, powerful rear hitch, and reliable hydraulic system. The tractor’s Category 3 rear hitch has a safe lifting capacity of 8295 (3760), allowing it to handle heavier objects easily.

In addition to this impressive capability, the tractor is equipped with a power take-off that makes using attachments like plows and balers easy for users. This tractor combines tractor strength with power and efficiency through its hydraulic system, making it the ideal choice for any agricultural operation.

Hydraulics specs

Hydraulic typeclosed center
Hydraulic capacity62.5 L
Number of valves2 or 3
Pump flow23.0 gpm
3-Point Hitch Category3/3N

John Deere 4840 Dimensions

The John Deere 4840 is an innovative tractor with impressive features, including its dimensions. With a total length of 178 inches, this tractor is a great option for transporting goods and other items over long distances; it can easily maneuver within tight spaces and take on more challenging terrain.

Additionally, its size allows for greater fuel efficiency compared to larger tractors in the same class, which can save farmers both time and money.

All in all, the dimensions of the John Deere 4840 tractor provide many benefits that will make any farmer’s work easier and more economical.

Dimensions Specs

Length176.8 in
Height116.9 in
Width96 in
108 in (long axle)
118 in (long axle)
Ground Clearance14.9 in
Front Axle Clearance26 in
Rear Axle Clearance28 inches
Rear Axle: Rack-and-pinion3.937 by 96 inches
Rack-and-pinion3.937 by 108 inches
3.937 by 118 inches
Turning Radius162 in
Shipping Weight14900 lb
Operating Weight18000 lb
Ballasted Weight20370

Common Issues With the John Deere 4840

The John Deere Deere 4840 is definitely an impressive piece of machinery. However, like many pieces of equipment, it has its issues. First and foremost is the tractor’s propensity for frequent oil leaks; outdated seals often result in significant amounts of oil spilling onto the ground and around the tractor engine.

Those with first-hand experience operating this tractor have reported common problems, including hydraulic sanding, transmission troubles, and starter failures. Experienced tractor owners can often tackle many of these issues with some mechanical knowledge, but more severe problems may require a professional repair service.

Common issues include transmission difficulty due to worn-out shifter components and sluggish fuel delivery due to leaking fuel injectors. Keeping on top of these issues is vital to ensure that your tractor runs optimally and saves on expensive repair costs down the line.


What horsepower is a 4840 John Deere?

The John Deere 4840 has a powerful 6-cylinder diesel engine that delivers 180 HP of maximum output power.

Is a John Deere 4840 a good tractor?

The John Deere 4840 tractor is well respected in the farm and agricultural machinery industry, but it is not without its issues. The tractor often experiences problems with hydraulics and oil spillings.

What years did John Deere make the 4840?

The John Deere 4840 was produced between 1978 and 1982.

John Deere 4840 vs. 4640: Who wins?

Both John Deere tractor models are powerful, but if you are looking for more horsepower delivery, the 4840 is the better choice.

What’s the problem with the John Deere 4840 tractor?

The John Deere 4840 tractor is a reliable machine, but with any tractor, there can be problems.

Common issues experienced with the John Deere 4840 tractor include power loss, starting difficulties, broken or worn-out belts and hoses, and failure to shift gears properly.

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Ben Bareja

Ben Bareja, the owner-founder-webmaster of This website was conceptualized primarily to serve as an e-library for reference purposes on the principles and practices in crop science, including basic botany. Read more here

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