John Deere 4720 Problems (3 Main Problems + Solutions)

Tractors fall victim to a different engine, throttle, and other problems. John Deere 4720 is no exception. 

So what are the john deere 4720 problems?

The most common engine problem with the John Deere 4720 is Error 06, which can be solved by replacing the MFWD sensor. PTO issue is a common clutch issue that can be solved by changing the PTO valves. Issues with the sprayer can be solved by fixing the strainers. 

This only identifies the issues and suggests potential solutions. This article has all the information that you would want.

John Deere 4720 Engine Problem

Problem Cause Symptom Solution
Error 06 No signal coming from the MFWD sensor Error 06 code on the dashboard Replace the MFWD sensor
Ignition won’t work  Bad ignition key/ faulty ignition wiring.  The engine won’t start  Replace the ignition key/repair the wiring

Problem: Error 06

There are multiple code errors with John Deere tractors. But Error 06 is the most common one. 


Code 06 is shown as an error on the dashboard.


Here is the solution to the john deere tractor error 06 problems. But before you get to replace the sensor, make sure you have the right tools. 

Tools required: Spanner 10, Safety Glasses

Step 1: Locating the MFWD Sensor

The MFWD sensor should be near the left rear wheel. It is right behind the break paddles. 

The sensor is basically a 6-inch line of cable. The part number, LVA17409, should be written on a tag on the sensor. 

Step 2: Opening the MFWD Sensor

Wear safety glasses before you start working. There will be fluid spillage while opening the sensor. So you can put a towel or bucket under the work spot to stop a mess from happening. 

Before unscrewing, pull out the plug of the sensor. 

Use spanner 10 to unscrew the bolt holding the sensor in place. There is only one screw holding the sensor. 

After unscrewing, there may be some spillage, so be wary. After unscrewing the sensor, pull it out.

Step 3: Reinstalling the MFWD Sensor

Take the new MFWD sensor and plug it in place of the old one. Then use the spanner to screw the bolt and tighten the sensor in place.

With this, you should be good to go. 

John Deere 4720 Throttle Problem

Problem Cause Symptom Solution
PTO Issue Damaged PTO Solenoid or Valve PTO switch turns on, but nothing happens Replace the PTO solenoid and valve.
Throttle lever stuck Throttle is stuck  Throttle will not move freely Clear the debris causing the problem

Problem: PTO Issues

PTO is the power take-off system. There can be different problems with it. 


When the PTO switch is pulled. The PTO light comes on, and nothing happens. 


Let’s see how to resolve john deere PTO clutch problems.

Tools required: 14 mm socket, 10 mm wrench, ⅞ box wrench

Step 1: Locate the PTO Valve

On the rear side of the tractor is a wire harness. It is located on the rear-right side. 

The wire harness has a wire that shoots directly back. It is a double wire with a plug in it. It will lead you directly to the switch with the PTO solenoid. 

Step 2: Unlocking the PTO Solenoid

The one on the left is the PTO solenoid. Use a 14 mm socket to unscrew the ¼ inch driver. Unplug the wire plug as well.

Step 3: Take the Diverter Body Off

Before removing the diverter body, drain the transmission fluid. After draining, put a bucket or towel under the work spot. This will stop a mess from forming. 

4 bolts hold the diverter body to the transmission. These are 10 mm bolts. 

For your help, take pictures of the setup. This will help out a lot while putting the whole thing back together.

After unscrewing all the bolts, gently pull out the diverter body. 

Step 4: Replacing the Valves

Use the ⅞ box wrench to remove the valve bodies. Now replace the valves on the diverter body with new ones. 

Now put the diverter body back in place. Reenact the previous steps in the opposite manner. 

The problem should be solved. If the issue with the PTO continues, the problem is probably with the PTO clutch. In that case, it is better to take the John Deere 4720 to a mechanic.

John Deere 4720 Lifting Problem

Problem Cause Symptom Solution
Sprayer Issues Debris is pressure strainer or boom strainer, open/closed orifice valve.  Fluctuation in the flow of solution.  Clean the pressure strainer and boom strainer, and adjust the orifice valve.
Hydraulic pump failure Damaged hydraulic pump Not enough power generated for lifting  Replace the hydraulic pump
Faulty hydraulic cylinder Damaged hydraulic cylinder  Not able to lift the laid properly Replace the hydraulic cylinder

Problem: Sprayer Issues

John Deere 4720 sprayers often experience these three-rate difficulties. The first issue is that the rate never stabilizes at the desired level but instead constantly vacillates about it.

The second risk is that the rate never returns to the desired level. Third, there is always a chance that the rate may remain consistently lower than desired.


Variation in the rate at which the solution is flowing.


Let’s see how to solve john deere sprayer problems.

Tools required: No tools are needed.

Step 1: Fixing the Pressure Strainer

The pressure strainer is very easy to access. It is right in the middle of the sprayer, on the right-hand side. It is right by the fill point.

The pressure strainer is the first place where debris will be hung up after entering the solution system. 

Before checking the pressure strainer, make sure the solution pump is turned off. Release the pressure of the strainer. Do this by releasing the valve on the strainer’s collar. 

The valve will release the pressure through the hose below. Then loosen the collar and remove the strainer. 

Now thoroughly clean the stranger. Make sure there is no debris left. 

After the strainer has dried, reinstall it. Make sure the bleeding valve is closed as well. If the valve is not closed, there is a chance of leaking the solution out. 

Step 2: Fixing the Boom Strainers

The boom strainers are on the back of the sprayer. There are actually three boom strainers. A left boom main strainer, a right boom main strainer, and a center strainer. 

Like the pressure strainer, use the valves to purge the pressure

Before starting, make sure the pump is turned off. Like the pressure strainer, use the valves to purge the pressure of the left and right strainer. 

Then proceed to remove the collar and take off the filters. Then clean the filters thoroughly to remove all debris. 

Then reinstall the filters. Make sure the bleeding valves are closed. 

Step 3: Fixing the Orifice Valve

The valve can be opened or closed. The valve must be opened if the flow is over 26 gallons per minute. The valve should be closed if the flow needs to be under 26 gallons per minute. 

While the valve is open, the flow is completely unrestricted. Allowing for more solution plumbing to go through. 

When the valve is closed, there is a small hole to let a small amount of flow. So the solution has restricted flow. 

Knowing where the orifice valve should be is easy from inside the cab. The flow rate is written on the screen right under the solution tank. 

If it is under 26, close the valve. If it is over 26, open the valve. 

You can also set the solution flow according to your wish. Open or close the valve accordingly. 


How Much Can a John Deere 4720 Lift?

The maximum weight that a John Deere 4720 with a three-point hitch can hoist is 2500 pounds. The capacity is 3,130 lb. at the ends of the links. Four-seven-hydraulics two’s can be controlled by five separate transmitters.

Is 2000 Hours a Lot on a John Deere Tractor?

No, 200 hours is not a lot on a John Deere tractor. It is considered broken when something has been used for between 2,000 and 2,500 hours. However, we talk about “high” hours after we get over 35,000.

Is 25 Horsepower Enough for a Tractor?

25 hp for a tractor should be enough, but it depends on the field. Look for a compact tractor with 25 to 30 horsepower if you need simple mowing on flat terrain. The 45-85 horsepower range is where you’ll want to put your money if you require a tractor specifically for plowing.


From the article, you can get an idea about john deere 4720 problems.

Multiple components can be the cause of the problem. Follow our article, and you should have everything figured out.

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