I need some serious help !

boggen · Jun 29, 2014

radiator behind the gas tank...
you most likely have a "engine radiator" normally always up in the very front of the tractor.
a hyd oil cooler (directly behind engine radiator) normally
directly behind the above to is main engine fan, then the engine.

and then possibly a "transmission oil cooler" this is most likely near the operator vs very front of the tractor like rest of the above stuff. it may or may not have a fan on it, and it may blow in a different direction if there is a fan on it.

i am wondering if you are trying to clean / deal with wrong radiator / oil cooler.

Egon · Jun 30, 2014

Unfamiliar with your tractor: does it have a reversible fan?

Consider a radiator pressure and flow test .

Tx Jim · Jun 30, 2014

boggen said:
thermostat as others have said...

i am showing a engine radiator in front, and oil cooler behind that, and then main engine fan.

Hyd oil cooler is beside radiator no between radiator & fan.

Tx Jim · Jun 30, 2014

hogheadCTD said:
Dont quote me but I think the 2020's had a head gasket issue.

2020's didn't have a history of head gasket problems.

Xfaxman · Jul 1, 2014

Check the lower radiator hose to make sure it is not collapsing internally, blocking coolant flow.

MNchipmaker · Jul 10, 2014

I had a similar problem on a 2030. It turned out to be a dirty injector causing a miss in one cylinder. I'd never had problems picking up a miss in a gas engine, but, it took a JD service manager to point that out to me.

Daronspicher · Sep 8, 2014

Hi, I just found this thread, I may be the only other guy with a 2020 gas.

I've had mine about 2 years and have done some work on it. My fuel line was rusting out and leaking so I took most of the front of the motor off to get it out and replace it.

I can't remember why I was in to the water pump, maybe because I had so much off the front already.

What I found was: The impeller on the water pump free wheels on the shaft it should be pressed onto. So, even though my belt is turning the shaft, there is really no reason the impeller has to turn, and thus no real water pumping in the circle.

Might want to open up the water pump.

If by chance you are any good at tuning the carb, I'd like to get a thread with you about that, or on email. Mine has been max rpms about 1800 to 2000 and I need to turn it to run full pto speed which I think is 2400 or 2500rpms so that my haybine runs at it's intended speed.

-Daron
Kendall County IL.

Daronspicher · Sep 8, 2014

I have a 2020 gas.

I was into it fixing the fuel line that had gone bad, had a lot of the front off for it.

Not recalling why I was into the water pump, but the impeller wasn't static to the shaft that spins it. In fact, it was free wheeling on there. Belt turns shaft, shaft does not turn impeller.

I wonder if you have something like that going on.

-Daron

willg · Sep 9, 2014

I have a John Deere 4020 diesel which has a 24 volt system. I removed the generator to have it checked and now need to know how to re-polarize the generator. Remember I am a real novice when it comes to electrical.