John Deere 4020 Faq

John Deere 4020 Faq Problems

Is a 1965 gas john Deere 4020 – with a tricycle front end – especially rare?

I have never seen a JD 4020 that is not diesel. Personally, I think diesel is the best option, especially in the John Deere machines of the 1960s. The utility of that particular end actually depends on what you want to do with the tractor. Originally, the tricycle front end was designed to plant row crops (corn and others) or to operate a pesticide system with the elevated tractor to stay away from growing crops. The widest front end with a massive shaft was designed for heavier work, such as plowing, dissecting and cultivating. The direction is easier with the widest front end, especially when weighing work is performed. I would leave the front of that tractor in particular as it is, unless you know with certainty that you will perform heavy work. Good luck with that JD; It looks like a very nice machine!

What does it mean if a John Deere 4020 has “Gen” on it?

My semi-educated assumption would be that that indicates an on-board generator. You will discover it quickly if your battery runs out.

John Deere 4020 repair questions

How much does it cost to reconstruct the engine of a John Deere 4020?

The labor and the pieces needed to rebuild a JD 4020 engine can vary a lot, even from one end to another of the same city. It is not very productive to try to give independent cost estimates of geography. Your best option is to contact one or more independent workshops in your area and get budgets for your specific work. If possible, work with a workshop that has obtained a personal backup of someone of your trust.

How can I unleash a frozen 3-point lifting lever in a John Deere 4020?

Spray a rubber cutter under the lever to take it down and restore the movement.

What does the oil light mean in a John Deere 4020?

The oil light in a John Deere 4020 is activated by low oil pressure. This can be caused by many different problems. A clogged filter, a bad pump, or being low oil can turn on the light. Note that it can be activated by a defective oil pressure sensor.

Problem with the alternator of a John Deere 4020 – Why do you rattle?

We have a John Deere 4020 that we have become an alternator a few months ago. He made an annoying noise when we set up for the first time, but this disappeared for the most part as we increased the revolutions. There was still an occasional tapping sound while the tractor was running, but this tends to disappear after an hour or two of operation. The tractor received a new strap at the same time as we made the conversion, so today I tightened it.

After doing this, I have launched the tractor and the knocking noise was worse than ever. By accelerating the engine, the rattle is still stopped, but it reappears when I turn off the engine. What could be this noise Clack Clack?

The most likely culprit, in this case, is the fan that hits the shield.

How is the fuel injector be purged in a 4020 John Deere John?

I have a John Deere 4020 with a Pink Master injector. I could purge the system to the injector but I have problems achieve any pressure on real injectors. Is it possible to purge the injector itself in a JD 4020?

Yes, this is definitely possible. Start by loosening all possible lines in the injectors. Next, press the crank until all the fuel comes out. Tighten the lines and should get a correct boot. If your tractor is equipped with glow plugs, remove them before bleeding – this will make starting faster and simplify the entire process.

Rosa Master / Stanadyne manufactured pumps require consistent internal pressure to function properly. If the internal pressure of the pump is incorrect, it will not work properly – or it will not work at all. Check the return line – it should come out of the top of the pump housing. Run a temporary hose to a dump container and continue cranking until all fuel is removed from the pump. If the return line doesn’t produce any fuel when you start, you won’t find any at the injectors, either.

On many of these pumps, you will find caps on the top casing that can be removed to check for fuel. If the fuel gets there, your problem is most likely a clogged return outlet valve. Unfortunately, the usual solution in this case is to do a complete rebuild of the pump.

If you are stuck in this situation, you may be able to start the tractor leaving the pump cover or one of the covers loose. This is too dirty to rely on for normal operation, but if you need to drive the tractor in a shed or put it on a trailer this might do the trick.

With a John Deere 4020 tractor that has been idle for eight years, what do I do first?

This tractor was last used eight years ago by my grandfather and me. He died not long after that, and no one has used the tractor since. I recently bought 20 acres of my own and my other relatives told me I could use the old tractor if I wanted to – although they also urged me to buy a newer model with 35 hp. I have some good reasons to try reviving the 4020 first, but I’m not sure where to start. I also have a Ford 5000 that works, but with PTO issues. Which tractor should I start working on first? As for the 4020, I’ve thought maybe I should start by spraying penetrating oil on the cylinders and letting it soak in for at least a day. Then I’d change the oil, install new batteries, and cross my fingers and give it a go. What is your opinion?

Remember to empty the fuel in the tractor and give it a fresh load.

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