Common Problems with John Deere 4320 and Their Solutions

Are you using a John Deere 4320 tractor? Or maybe thinking of buying one for your field? Well, you should be aware of the problems that you may face in the future or maybe you will have a smooth experience of using the tractor. But it is always good to know the common problems of something that you are using or going to buy.

Then you might ask, do you need to change the tractor after using it for one or two years? Will the John Deere 4320-model be good and durable?

First of all, you can use the tractor for a long time without facing any serious issues. And the 4320 of John Deere is very good and durable as well. But I will talk about some common problems that you may find in this model.

Most Common Problems with John Deere 4320 and Their Solutions:

There are not many problems that you will see in this John Deere 4320 tractor. Still, there are some that I need to mention and how you can fix those problems.

1. Fuel Pumps problem:

A sensor inside a John Deere 4320 tractor’s fuel pump aids in regulating fuel flow towards the carburetor. If the sensor fails, the pump will not provide enough gasoline for the engine to function, causing it to backfire and shut down at random.

The pump’s sensor may be checked without using any electrical instruments, and the operation takes around 15 minutes, so you’ll know whether your pump has to be changed soon.

Here are the ways to know if the pump is having a problem.

  • Place the John Deere mower on level ground.
  • If there isn’t any gas in the tank, fill it up.
  • Place a pan below the engine to catch any spills.
  • Open up the hood. Locate the rubberized fuel line on the engine’s side. Track it until it enters the engine’s carburetor. Unplug the line’s pins as well as the line’s wire.
  • Attach an alligator clip to the battery’s (+) terminal. Connect the second clip to one of the points on the fuel line where the lines were connected.
  • Attach the other alligator clip from the battery’s (-) terminal to the gasoline line’s other wire connector.
  • The fuel should be drained into the pan. Take a look at the fuel that’s flowing out of the tap. The pump is operating properly if the fuel is being pumped out quickly. The pump should be changed if it is only trickling out.

Now, if there is a problem here is how you can fix it-

  • Disconnect the mounting screws when the fuel valve is closed or the line is crimped.
  • Next, use needle tip pliers to remove the clamps, detach the gasoline lines.
  • Disassemble the pump by removing the screws.
  • Look for cracks or other damage to the body. Metal components should be soaked in an all-purpose part cleaning. It is possible to immerse the pump body for up to 15 minutes.
  • Change any defective parts and inspect the hoses for fractures, softening, or hardness.
  • Replacing outdated gaskets, diaphragms, and springs with components from an authentic manufacturer’s repair kit is a good idea.

2. Steering wheel issue:

You may find it difficult to steer the 4320 tractors at times. The tractor becomes stuck or difficult to maneuver.

So, if you wish to solve the issue, follow the instructions below:

Park the tractor on a flat surface and turn off the engine. Double-check that the tire pressure is right. If the tires look to be underinflated, fill them with air. You may examine the steering gear by releasing the steering support bolts. If a bushing is damaged, it should be replaced.

Change any cracked bearings, shafts, or gaskets in the steering unit. Analyze the drag linkage that connects the tie rod to the gear sector. After the repairs have been completed, test the tractor’s performance.

3. Faulty starter:

Some users have reported a faulty starter in their John Deere 4320 tractor. You can determine what is causing it by using a voltmeter.

Set the voltmeter to DC and connect the wires to the negative side of the battery and the positive side of the solenoid starter’s battery terminal.

Start the tractor to check if the tractor operates once the wires or cables have been repaired. At this point, inspect the voltmeter for any signals on the screen. If it doesn’t work, try the next option.

You can use a screwdriver to troubleshoot the starter problem and allow the machine to reboot for a brief amount of time. But, depending on a screwdriver all the time when you cut the lawn is impractical.

Hence, the only reliable and secure solution is to obtain a new John Deere gearbox for this tractor.

Your tractor will start normally once you’ve fixed it and correctly connected all of the adjoining parts and wires.

4. Hard start problem:

Fuel will be the most obvious item to examine, especially if you didn’t have starting issues the previous year. Ascertain that the equipment has a sufficient supply of new fuel.

It’s astonishing how many folks take their tractor out of cold place on the first sunny day of spring just to discover that it won’t start. Forgetting that they had left the previous year’s petrol in the tank.

Fuels nowadays do not age well. In reality, today’s gasoline is similar to milk in that it spoils fast, frequently in as little as 60 days.

Now, if the fuel is not the case, the carburetor may be clogged. The most typical cause of a clogged carburetor is keeping gasoline in the hedge trimmer for an extended length of time.

Some of the components in the gasoline may evaporate over time, leaving a thicker, stickier residue. This sticky gasoline might block the carburetor and make it difficult to start the engine. If the carburetor is blocked, use carburetor cleaner to wash it. If cleaning the carburetor isn’t enough, rebuild or change it entirely.

Another reason a tractor won’t start seems to be that the spark plug is not properly installed, is dusty, or is just old. Ensure that it is properly in place, and if that is dirty, clean it.

Changing your spark plugs once a year is inexpensive and can help you avoid problems like this. Putting little starter fluid on the tip of the spark plug could also aid at the beginning of difficult-to-start tractors. Also, double-check that all of the connections are properly connected.

A blocked air filter can also make it difficult to start a mower. Check that it is clean and clear of debris before attempting again. If it is really unclean, you should consider replacing it.


John Deere 4320 tractor rarely show any symptoms of system failure or any kind of issues. However, the above-mentioned problems have been found commonly by some users. 

Hence, if you want to enjoy a good tractor to use on your field on a sunny spring be sure to take good care of it. Do the maintenance regularly and if you have trouble with a problem that you can’t solve by yourself, make sure you take it to an expert mechanic.

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