John Deere 6420 is a versatile and powerful tractor that can handle various farming tasks. However, like any other machine, it can also experience some problems that affect its performance and durability.
It is common for John Deere 6420s to experience problems that are related to the A/C unit, the PTO, the fuel consumption, the engine, and the transmission. Below we have provided you with the solution to common problems of John Deere 6420. Check them out!
Quick Look at John Deere 6420 Problems and Solutions:
| John Deere 6420 Problems | Solutions |
| Issues with the AC | Clean the air filter and the condenser. |
| PTO Problems | Replace the PTO sensor and blown fuse. |
| Poor Fuel Economy | Check the fuel valve and fuel pump. Replace the fuel pump if needed. |
| Shutting Down Problem | Clean the fuel lines and tank. |
| The Engine Begins to Shake After Starting | Get it fixed by a professional. |
| Engine Rev Difficulties | Replace the sensor. |
| Power Quad Reverser Issue | Get it repaired at the service center. |
7 Most Common John Deere 6420 Problems and Their Possible Solutions
1. Issues with the AC
The most common issue with the John Deere 6420 tractor is the AC unit issue. In case the air filter becomes clogged with dirt and dust, the AC unit starts malfunctioning.
When you turn on the AC, the air will start becoming warm. The temperature will rise from 40°F to 55°F. Moreover, the suction line at the low side gauge connection will be fully covered with ice.
Solutions
To fix the AC issue in John Deere 6420 tractor, you need to check the air filter. If the air filter is clogged, you need to clean it or replace it as needed.
Then, check the condenser of the AC unit. If the condenser’s air filter is clogged, you need to clean it as well. Also, clean the condenser to ensure efficient cooling. Lastly, check the AC unit’s wiring, and if there is any fault, fix it.
2. PTO Problems
The PTO problems are common not just in John Deere 6420 tractors but in many other tractors. There are various PTO problems which include PTO not engaging, the back hydraulics not functioning, and the front reverse not working.
Aside from that, you may occasionally see the transmission warning light, the stop light, the danger light flashing, and the exclamation point light.
Solutions
To fix the PTO issue, you need to check and fix the PTO sensor. If the sensor can’t be fixed, then you will have to replace it. Next, check the fuse, and if it has blown, you need to repair it.
3. Poor Fuel Economy
Excessive fuel consumption or poor fuel economy is another problem with John Deere 6420 tractors. If you notice that the tractor is consuming more fuel than usual, turn you need to check the hydraulics.
Solutions
To fix the excessive fuel consumption issue, you need to make sure the fuel valve is working fine. Next, you need to check the fuel pump. If the fuel pump is discharging or if it is dumping heat, you need to either repair it or replace it.
4. Shutting Down Problem
Another common problem with the John Deere 6420 is that the engine shuts down after 3 to 5 seconds of continuous use, which usually happens due to a fuel supply cut-off.
Solutions
To fix the shutting down problem in John Deere 6420 tractor, you need to dismantle the fuel line from the tank and clean it out. If there is some obstacle sitting in the tank, you need to remove it. Make sure to clean the fuel tank thoroughly to fix the problem.
5. Engine Begins to Shake After Starting
Another common problem with John Deere 6420 is that its engine start shaking after starting. If you are dealing with a similar problem with your tractor, then you need to try out several solutions.
Solutions
Start by doing a choking check. If this doesn’t solve the issue, you need to check the electrical circuit board, the fuel injector, and the solenoid. If possible, get this checked and repaired by a professional.
6. Engine Rev Difficulties
Another problem with the John Deere 6420 tractor is the engine rev problems that take place frequently. When you try to accelerate the tractor completely, you will notice the engine rev difficulties after some time of use.
This is a typical issue that generally takes place in the John Deere models only. If you have any other brand or model tractor, the repairing solution may be different for you.
Solutions
To fix the engine rev difficulties in John Deere 6420 tractor, you need to check the sensor. The sensor should be inspected properly. If it is malfunctioning, you need to replace it, as the sensor can’t be repaired.
Furthermore, if you are facing regular engine rev difficulties with your John Deere 6420 tractor, it would be advisable to carry a spare sensor that you can use during the problem.
7. Power Quad Reverser Issue
Last but not least, the power quad reverser issue is another common problem in the John Deere 6420 tractor. The JD 6420 tractor comes with a power quad transmission along with a left-hand reverser.
Whenever you push the button forward, you will notice that it displays N and gets you a warning tone on the tractor.
However, if it is working in reverse, then you will notice another issue with the JD 6420 tractor. It is highly possible that there is an issue with either the reverser lever or the forward solenoid. Not just that, the wiring of the solenoid could also be the culprit causing the issue.
Solutions
To fix the power quad reverser issue in John Deere 6420 tractor, you need to make sure that you read the codes properly. You can search on the internet for the code and fix the issue.
However, the best way to fix the issue is by noting down the issue and asking customer service for assistance. Additionally, you can take your tractor to the service center and ask them to resolve the issue on your behalf.
Read: John Deere 1445 problems
Frequently Asked Questions:
How Much Horsepower Does John Deere 6420 Have?
The John Deere 6420 offers 110 horsepower, which is equivalent to 82 kW.
Which Engine Does John Deere 6420 Offer?
The John Deere 6420 comes with the John Deere 4.5 liter 4-cylinder diesel engine.
How Much Fuel Can the John Deere 6420 Hold?
The John Deere 6420 can hold a maximum of 48.9 gallons or 185.1 liters of fuel.
Conclusion
In short, the John Deere 6420 is a reliable and efficient tractor that can help you with multiple farming tasks. However, it can also face some common problems that can affect its performance and durability.
Fortunately, most of these issues can be addressed using the simple solutions mentioned above. To avoid these issues in the future, make sure to clean, check, repair, or replace some parts. By following these solutions, you can prevent further damage and save money on repairs.
