John Deere 3520 Problems (The 360 Guidelines)

John Deere 3520 is a popular name that can perform pretty much every job related to farming. With all of its good sides, it also has some problems you will need to take care of. 

On John Deere 3520, hydraulic issues or the machine not starting are common problems. Replacing O-rings, gaskets, and hydraulic pumps will fix different hydraulic issues. To solve the starting issue of the machine, you simply need to replace the starter solenoid.

The problem should be fixed. Still not sure? Well, do not worry. Because in this guide, I have discussed it all. 

John Deere 3520 Hydraulic Problems

John Deere 3520 Hydraulic Problems 

A serious issue in your John Deere 3520 tractor is a hydraulic system failure. It might result in the loss of power steering or brakes, as well as other hydraulic functions.

Problems Reasons Solutions
Oil dripping from machine components
  • Poor fluid quality or a low fluid level
  • Fuel or water pollution of fluid because of leakage in the engine 
  • Engine oil pressure (EOP) sensor failure
  • Inspect the quality and amount of the fluid and replenish or replace it as necessary. 
  • For an EOP failure, get the EOP sensor checked and fixed. 
 Rear lift stalled
  • The hydraulic pump’s worn bearings.
  • Inspect the bearings for wear and replace them with new ones
Machine won’t run
  • A clogged or broken hydraulic pump 
  • Clean the clogged hydraulic pumps 
  • Get pumps replaced if necessary.
  • The O-rings and gaskets should also be fixed or replaced.

Problem 1: Oil Dripping from Machine Components 

This is a common hydraulic issue that many users encounter when using John Deere 3520. Out of nowhere, oil starts dripping from various machine components. 


The engine oil pressure (EOP) sensor might fail often.  And this failure can cause the oil to drip. Also, poor fluid quality or if the fluid level is low, it can happen.

Another treason can be fuel or water pollution of a fluid (due to a leak in the engine).


To solve this oil dripping issue of the John Deere 3520 hydraulic system you can do the following things. 

  • First of all, what you need to do is switch out your EOP sensor. 
  • Then, thoroughly inspect the quality as well as amount of the fluid.
  • Make sure what you have there is the right amount of it. And if you feel the fluid quality is not satisfactory, replace it as necessary.

Problem 2: Rear Lift Stalled 

You may see the rear lift stalling while you are in the middle of operating the vehicle. Or, something similar like maybe the pressure regulator was malfunctioning.  


All of these above-given issues happen for the same reason. And that is worn bearings. When the hydraulic pump’s bearings get worn out, this problem arises


Servicing your John Deere 3520 can seem like a hassle. However, after figuring out the reason, you can effortlessly perform the solution because it is simple.

You need to first Inspect all the bearings thoroughly for wear. When you verify it, just replace them with new ones. And your issue should be resolved just like that.

Problem 3: Machine Won’t Run

Another hydraulic issue of your John deere 3520 can be that the engine starts, but it won’t continue to run. Or perhaps the machine moves very slowly or jerkily. 


The reason behind your machine’s erratic behavior can be a broken hydraulic pump. Sometimes a blocked suction filter on the pump can also cause this issue 


After determining the potential reasons, you troubleshoot this specific hydraulic issue very easily. Inspect the O-rings and look for any damage or wear. If you can locate any, get them fixed. 

Then likewise scan the gaskets, as well. If they seem damaged, they should be fixed or replaced. That is how you can resolve the specific hydraulic issue of your John Deere 3520 tractor. 

John Deere 3520 Power-loss Problems 

The sudden loss of power with John Deere 3520 machines has been one of the major complaints. 

This issue may cause your tractor to abruptly stop working in the middle of a task. It might even harm other parts of your tractor and cause issues with the performance of your machinery.

Some symptoms may be displayed by your 3520 tractors if there has been a sudden loss of power.

Sometimes the engine speed fluctuates or abruptly stops operating. Warning lights show up on the control panel, and the engine speeds up, and then abruptly it stops.

Or the engine shuts off while it’s going before starting again after a short while. Throttle input shows no response to the machine when it happens. 


One or more of the following are potential reasons for this issue.

One reason can be a blown fuse or perhaps a malfunctioning start switch. It occurs because the engine is not getting enough air because of a dirty air filter or clogged muffler screen. An unclean fuel tank

can be the reason which leads to fuel supply issues brought on by a malfunctioning fuel pump or fuel filter. 

Finally, faulty or unsecured electrical wires can be the reason as well. 


Once you’ve located the issue, proceed as per the following instructions.

  • First of all, any blown fuse panel should be replaced.
  • Then check the fuel tank for water or debris, and if necessary, clean out any pollutants using a wire brush.
  • You need to check the fuel lines for obstacles like dirt or other foreign objects. Clean out any debris you find. 
  • Examine the starter circuit’s wiring for any damage. Make sure to inspect the starter motor for wear and the battery terminals for corrosion.

And by following these instructions, the issue should be resolved! 

John Deere 3520 Arm Lifting Problems 

Several issues may arise if the lift arms on your John Deere 3520 do not fully descend. As a result, reaching the necessary depth for cultivating or tilling may not be possible.

This might make connecting tools like cultivators and ploughs challenging or perhaps impossible. 

Here are the signs, the root reasons, and potential treatments. The lift arms will only lower to a specific height before stopping. And the lift arms won’t even budge.


Due to the following problems, your John deere 3520 may not be able to fully lower its lift arms.

  • The lift arm might be set too high.
  • The tractor has been lowered while the lift arms have been used.
  • Operators have been lowering the lift arm while completing other tasks.
  • Low hydraulic fluid levels (possibly from a leaking fitting).
  • The relief valve is unresponsive.

These were the reasons! 


One of the below options can be used to fix the lift arm lowering problem.

  • Consider replacing the hydraulic cylinders while attempting to lower the lift arms in a new position. 
  • Check the tractor’s hydraulic system for leaks by getting it serviced.
  • Replace the relief valve if the aforementioned does not work.

After following these instructions, your issue should be resolved. 

John Deere 3520 Not Starting 

Any problem with your tractor, a low battery, or a problem with the fuel injection system prevents it from starting. The following symptoms could be the signs related to this issue. 

Sometimes you may notice the tractor cranks and the engine turns over a bit, but won’t start. Although the starter motor is operating, the tractor still won’t start. Sometimes, the tractor starts but quickly stalls out. These are the signs. 


There are a number of reasons why the engine in your tractor might not start, including:

  • Faulty wires or connections of the spark plugs.
  • Faulty relay switch or ignition switch.
  • Dead battery cell or faulty battery.
  • Failure of the starter solenoid.
  • Some electrical issues. 


Try the given methods for troubleshooting when your John Deere 3520 has difficulty starting.

  • First of all, make sure the tractor has sufficient fuel.
  • Then inspect the fuel lines for any cracks or kinks, then clean the filters. Also, make sure that there is no blockage at the lift pump.
  • Now inspect the spark plug wires as well as the connections. Make sure that there are no busted or damaged spots. In case you locate bad wires, get them replaced.
  • Next, look for any damage in the ignition switch as well as the relay switch. If something appears to be damaged, you need to replace it immediately.
  • And finally, you are going to replace that starter solenoid.

John Deere 3520 Turbo Charger Problems 

Failure of the turbocharger is one of the more frequent issues with a John Deere 3520.

If left unattended, turbocharger failure can result in the engine shutting down unexpectedly or failing completely. This issue can make it difficult for the engine to run smoothly.

The turbocharger may make a whining sound due to this issue. Or there might be low output power at high RPMs. The reason may be the heavy exhaust smoke. Or perhaps it is the reduction in fuel efficiency. 

If not, the exhaust pipe might be emitting a burning oil odor.


The following problems can cause the turbocharger of the John Deere 3520 to malfunction.

  • Inaccurate oil level (too high or too low)
  • Inside the turbocharger system, there are foreign things like lint from maintenance rags, etc.
  • Lack of maintenance, improper oil changes, or clogged oil pickup screen/filter all contributes to inadequate lubrication.
  • Worn bearings might cause wheels or shafts to excessive play.


To fix your tractor’s turbocharger failure issue, proper maintenance is necessary. What you can do is as follows.

  • First of all, Swap out the worn bearings.
  • Any leaking seals, gaskets, or o-rings should be changed.
  • Make sure the turbocharger is always properly greased.
  • Look for any damage inside your turbocharger, and get it repaired.
  • Finally, to prevent carbon accumulation, regularly clean the turbocharger.

John deere 3520 Fuel Capacity 

Well, a John Deere 3520 Fuel Tank can hold about 23.8L or 6.3 gal. of fuel. Fuel capacity normally refers to the amount of fuel that a certain vehicle fuel tank is capable of holding. 

So, if you are a user of John Deere 3520, be assured that it is a decent one when it comes to fuel capacity. 

John Deere 3520 Horsepower 

John Deere 3520 Horsepower

Horsepower is yet another factor that you need to consider when buying a utility tractor. So, how much horsepower can a 3520 John Deere offer?

The 3520 John Deere offers good horsepower while maintaining remarkable lift height and reach. The rated net horsepower of the John Deere 3520 is 37 hp (27.6 kW).

John Deere 3520 Parts Diagram 

From the users’ reviews, they had mostly good things to say about John Deere 3520. All its parts being of good quality are very manageable to get on and off.

With a good quality engine and power- all the parts combined make it an overall great tractor.

John Deere 3520 Parts Diagram


How Can You Determine the Year From a Tractor’s Serial Number?

To determine the year from a tractor’s serial number, you need to use the six-digit number for that. And to determine the year, remove three from the first and fourth digits.

Is 2000 Hours a Lot on a John Deere Tractor? 

Generally speaking, anything between 2,000 and 2,500 hours is considered to be properly broken in. However, anything beyond 35,000 hours is regarded as high.

What is John Deere’s Biggest Engine?

An 18-liter engine made by John Deere has a maximum power output of over 870 horsepower (670kW). The new block was created by John Deere Power Systems and has internally developed engine controls, a high-pressure common-rail fuel system, series turbochargers, and cooled EGR.

Wrapping Up 

Hope I have resolved all your queries about John Deere 3520 problems. Now you have this comprehensive guide handy.

From here, you can point out the issue that matches your case. Then go for the solution. As I have explained everything here, it should not be a hassle. 

This is all for now. Have an awesome day!

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