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Need diagram of hydraulic system on 1969 john deere 4020 especially looking where the fill nozzle is

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Need a Harmonic balancer puller for 4020 John Deere tractor


Your local Jd dealer can get you service guard tool for that specific pulley or they can advise you on how to remove it. Some dealers may loan you the tool. Just depending on dealer.

May 19, 2015 | John Deere Garden

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Wiring diagram 1969 4020 john deere deasel tractor


Usually there are forums specifically for a brand and even models. I would seek help there. Also look on Ebay. Have you asked a dealership? They might even scan and send you images.

Aug 27, 2013 | Vehicle Parts & Accessories

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Where's the hydraulic oil fill for a John Deere 3020? Is it next the seat? What's the hydraulic system oil capacity? What type hydraulic oill would you suggest?


The oil fill cap is just above the oil dipstick at rear of tractor.
the capacity of the system is 4.5 gallons.

Oct 08, 2010 | John Deere Garden

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JD 4020 Row Crop Tractor; No power Steering, No


In regard to the problem - JD 4020 Row Crop Tractor; No power Steering
What was the problem and how did you fix it I'm having a simlar problem

Apr 29, 2010 | John Deere 420,1020,2010,2020,2510,2520...

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Diagram for the battery wiring on a 1969 JD 4020


If yoe are still useing two 6v. batteries then the cables go;positive from the starter solenoid to the closest batteries positive post,the negative post of that same battery feeds over to the next batteries positive post,then join the negative to the engine block or tractor frame.If now has 12v. batteries then join up the positive with the positive posts and join the negatives to ground.If the tractor has a 24v system,[not familiar with the tractor ,none in this area and don't have service advisor here at home],hook the twelves up as i previously stated for the 6v batteries.Let me know if you need more help and i can look it up at work for you.

Nov 24, 2009 | John Deere 4020 Gas & Diesel Tractor...

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I have a 1969 John Deere 4020 that is cold blooded. It turns over fast, but won't start without being pluged in or using ether below 70 degrees. What are the potential problems?


Cylinder Compression Low, Valves worn ... not seating properly, valve stems.
Injector nozzles worn ... dribbling rather than precise squirts, injection pump worn.

First and easiest thing to do: pull all nozzles and have them tested, pull the injection pump and have it rebuilt and re-calibrated.
*NOTE: you can pull these, but are components that proffessional need to rebuild and calibrate. Truck shop, or farm tractor shops have places that specialize in this type of work.

If it is gasoline, I would look towards pistons, rings, valves.

Nov 12, 2009 | John Deere 420,1020,2010,2020,2510,2520...

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