4620 turbo... the REST OF THE STORY....

Bob · Feb 6, 2018

Tractor doesn't have a "through the hood" airstack.

The pre-cleaner under the hood got clogged with debris causing the engine to pull exhaust back through the aspirator and set the debris in the air cleaner on fire!

<img src = "http://oi64.tinypic.com/2hr1g87.jpg">

<img src = "http://oi64.tinypic.com/2r61vlv.jpg">

<img src = "http://oi67.tinypic.com/32zml9i.jpg">

Even melted a hole in the compressor housing, thought I had a better photo of that, but you can see the hole in the housing in the ipper right area of THIS photo:

<img src = "http://oi64.tinypic.com/15d2jvq.jpg">

tomstractorsandtoys · Feb 6, 2018

Mine does not have the thru the hood airstack either. I will check it before spring work begins. The 4520 engines had a different air cleaner and had a bad habit of setting the air filters on fire and feeding them to the engine. Tom

ss55 · Feb 6, 2018

I was wondering why there was so much soot on the intake side of that turbo, LOL.

2002sliverado · Feb 6, 2018

I found what you shared to be quite interesting, but also rather concerning, too. Fortunately, the only tractor we have of similar vintage is a 6030, but it has the pre-cleaner aspirator on the intake stack. Did the 4320's of that era, which lacked an upright intake stack, have a pre-cleaner similar to this? Maybe I should expand on that question........Did the other Generation II tractors, lacking an upright intake stack, have something like this pre-cleaner in the intake system? The 4320 we had was equipped with the upright intake stack, but it has also been 30 years since it left the farm, and about all I remember was an air filter of similar design to the one on the 4440.

I know the 45-49 "60 Series" tractors lack the intake stack there counterpart "55 Series" tractors had. Does anyone have any idea if this could also be a concern on those "60 Series" large frame row crop tractors, too?

This last statement is really off this topic of a tractor, but looking at the attached photos, the "pre-cleaner" photo in particular, it looks very similar to what is inside these "bagless vacuum cleaners." One of ours wouldn't operate properly (a vacuum cleaner that had lost its suction) and it seemed like it was running a bit warm, too. I took the component out that looked like this "pre-cleaner" and tapped it against an outside stair railing, which released a lot of dust and small debris. After tapping it against that wood railing for about 5 minutes, there was no more dust and debris released. After I re-assembled it, I found the device to be operating like it had when I originally purchased it a couple years ago, with all its suction having returned.

fdt860 · Feb 6, 2018

(quoted from post at 12:45:15 02/06/18) I found what you shared to be quite interesting, but also rather concerning, too. Fortunately, the only tractor we have of similar vintage is a 6030, but it has the pre-cleaner aspirator on the intake stack. Did the 4320's of that era, which lacked an upright intake stack, have a pre-cleaner similar to this? Maybe I should expand on that question........Did the other Generation II tractors, lacking an upright intake stack, have something like this pre-cleaner in the intake system? The 4320 we had was equipped with the upright intake stack, but it has also been 30 years since it left the farm, and about all I remember was an air filter of similar design to the one on the 4440.

I know the 45-49 "60 Series" tractors lack the intake stack there counterpart "55 Series" tractors had. Does anyone have any idea if this could also be a concern on those "60 Series" large frame row crop tractors, too?

This last statement is really off this topic of a tractor, but looking at the attached photos, the "pre-cleaner" photo in particular, it looks very similar to what is inside these "bagless vacuum cleaners." One of ours wouldn't operate properly (a vacuum cleaner that had lost its suction) and it seemed like it was running a bit warm, too. I took the component out that looked like this "pre-cleaner" and tapped it against an outside stair railing, which released a lot of dust and small debris. After tapping it against that wood railing for about 5 minutes, there was no more dust and debris released. After I re-assembled it, I found the device to be operating like it had when I originally purchased it a couple years ago, with all its suction having returned.

All the 4520 and 4620 have the aspirator under the hood, regardless if they have the air stack or not. The one that do have the air stack are using a poorly made design to go over the radiator, with the hood and some foam sealing it. Today the foam is no good anymore, and interesting stuffs can be found inside of the duct when hood is lifted.
I think that Newgen posted in there a fiberglass setup he had made. If this is all well sealed up, chance of blockage should be greatly reduced.
Extra issue with a blocked air filter on a turbo tractor is increased turbo speed, which can destroy the turbo as well.

I have seen more than one 4520s that had the system simplified a bit by having a hole cut in the hood and an air stack put in there aside of the muffler. This suppressed the air precleaner system that had poor reputation and that was not so easy to clean. That is like going back to the old John Deere Gs.
If there was a way to cleanly have the air stack like a Deere 4440 on a 45-4620, I would do it right away with a 6030 chemney and aspirator, because I really do not like the flumsy thing they put up front of the radiator.

The 84/8630/40 have the aspirator as well, but much bigger. Then the 45/47/4960 have it.

I think that with periodic maintenance of the system, this can work pretty good, only issue is to have to lift up the hood to clean it.

The 6030-7520-late 7020 are also aspirated with a very similar system, except that it is so much higher over the hood.

4320 does not have this, and is much like a 4430.

Glen D Anderson · Feb 6, 2018

That's a good one Bob!

I think you could say that particular 4620 was equipped with EGR......LOL

fdt860 · Feb 9, 2018

Important thing is that the 4620 is supposed to have a check valve in the air filter to prevent this to happen. 4520 probably did not. It is written in the service manual to have it checked every so often.

Bob · Feb 9, 2018

fdt, it's a customer's tractor, and I went through the while system a few years ago, including checking the internal flapper valve.

I think they just plugged it so bad the flapper couldn't keep all the exhaust from being sucked back.

Also, there were two "through the hood" adapters sold by DEERE, depending upon the time frame.

The later system was an elbow that connected directly to the plastic ductwork, eliminating the foam-sealed airbox adapter you mention. I have located one at a boneyard, if they can actually find it and get it shipped.

Both versions are in the 4620 PC.

4620 turbo... the REST OF THE STORY....

Bob

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tomstractorsandtoys

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ss55

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2002sliverado

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fdt860

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Glen D Anderson

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fdt860

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Bob

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