Question about John Deere 4020 Gas & Diesel Tractor Radiator
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Posted on Jan 02, 2017
Have you checked to see if there is bubbles in the fuel system by cracking the fuel lines on the injectors? If you have a remote start button you can connect it to the stater and be sure it's out of gear with a wrench crack open the fuel line to each injector one at a time and see if when you crank it over for 20 seconds does fuel come out or do you get air bubbles? If you get fuel and no air continue to check each injector after you have checked all injectors do you have any that had air? if one or two had air check those injector lines and connections for breaks in the fuel lines. If you find no crack in the fuel lines when the engine does run do you get any black smoke when it fires up? if not it's a low fuel problem so you need to check the fuel pump with a in line fuel pressure gage see if the fuel pressure is steady, if it's not it could be many things including the following. Fuel shut off valve stuck closed fuel safety switch defective cracked intake tube going into the fuel tank where the sending unit is junk in the fuel tank or a bad fuel pump or bad injectors. You did not give how many hours the engine had on it so it could be worn injector tips. keeping the fuel from holding pressure causing low pressure loss. Also if the tractor had been operating with a lot of black smoke you may have rings stuck causing low compression. There is an easy way to find if you have a dead cylinder if you go to a truck parts store and buy a grease stick that melts when the temperature gets hot enough. To do this you mark each exhaust port on the manifold run the engine as long as you can and see if the grease pen melts if it's no melting then you could have low compression. if this is the case then you would have to run a compression test to see if cylinders have low compression. to do a compression test you would have to remove the fuel lines pull injectors one at a time and crank the engine over 4 bumps on the pressure gage take the reading it should be around 600 PSI and should not be a difference of more than 10% between all cylinders.
It could be as simple as you have air in the system and it just needs to be bleed as I stated before. Without more details troubleshooting would be like using a scatter gun to hit the problem it would be a hit and miss problem. It is possible that the fuel is too cools and it is jelling up. If your in a area where it's below freezing all the time the fuel could be jelling up and you will need to run number 1 diesel or diesel anti gelling agent to help the diesel flow correctly.without knowing the ambient air temperature that the tracker is sin it is again hard to trouble shoot the issue. If you want to give me more information I can at least get you close to the problem but I would need to know if the tractor is stored outside is it below freezing what fuel your using, is the air filter clean do you have compression is the fuel pump pressurizing do you have a cracked fuel line on the sending unit on the tank. Let me know if you want more information. Thanks for using Fix-ya and let me know if this helped by replying to the email at the bottom of the page you receive from Fix-ya.
Posted on Feb 14, 2010
Have you tried crossing the large post of the starter with the small terminal that has the engagement wire going to it[with the machine in neutral and the range lever in neutral if course].If this will make the tractor turn over then the problem is likely the neutral safety switch located under the panel that is covering the transmission just rear of the sticks.
Posted on Jan 08, 2010
Locate the plug on the right side of the engine that comes out from under the engine cover and also the regulator that bolts to the engine top cover on the top right side,held in with a bolt that take 10 mm wrench.The problem is usually burnt wire end in the plug or the regulator it's self has to be repaired or replaced.
Posted on Jul 30, 2010
have you tried bypassing the temperature sensor in the glow plug circuit? sometimes its in the blocks water temp sensor or in the intake manifold area that senses the need to use the glow plugs or not,due to the air and water temperatures in the engine,you will need to obtain a J.D. service manual for their locations on the engine
Posted on Jun 10, 2011
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