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JD 3020

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Trobb55

New User
Looking for some information on a John Deere 3020 diesel row crop tractor I recently acquired. It has the diesel engine. On the right side of the engine there is a "line" coming from the rocker arm cover and runs down the side of the engine, and hangs out just below the frame of the tractor. I noticed while running, and using the tractor there is a bit of what looks like white smoke or steam coming out of it. Not sure exactly what the purpose of this "line" is, and am thinking the smoke or steam may not be a good thing. I am unfortunately not familiar with these tractors, and have not found much information on this line as of yet. Any help is greatly appreciated. Thank you.
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Thought it might be, but wasn't really sure. As I said just recently got the tractor. And had not noticed before the other day. Thank you!
 
Good tractors just a smaller version of a 4020 .
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Here?s one pulling a new Holland baler the requires 90 pto horsepower
 
As the others have said, it is a breather tube. It is exhausting any compression that is getting past the rings, and as the tractor warms up it is venting any condensation that is in the crankcase. If it gets worse as the tractor gets up to operating temperature, you may want to check the engine oil for water. After it has set overnight, crack the drain plug and see if any water or coolant is present. Just as a preventative measure, you might want to change the oil and filter
 
The tube is the crankcase breather or vent . It lets excess crankcase pressure aka blow- by out . Normal to have some fumes coming out, excessive fumes and oil indicates problems.
 
Watch the oil level and work her hard for a while and it might clear up, if it hasn't been used in a while it might need to be worked a bit to get everything sliding or sealing where it should
 
Pretty good size . I had to back the tension off a way it was blowing the Knots on 350 knot strength twine
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I'm surprised no one else mentioned this, before the era of pollution controls, every car and truck had a similar setup, hanging down from the engine to vent blowby from the crankcase into the air stream under the vehicle, if idling in traffic, you'd smell it. (Setup was called a "road draft tube".)

Then along came "PCV" (Positive Crankcase Ventilation) and the oil mist and stink was piped into the intake manifold and burned along with the fuel in the engine, the exhaust could still stink, though.

Nowadays, automotive engine tolerances are tighter to limit oil leaving the engine through the exhaust and the stink is cleaned up by the "cat".

Pardon me for digressing, but folks that have been only around modern vehicles (which would apparently apply to the O.P.) are unaware of how stinky stuff used to be!
 
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