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At the beining of season I could not get my =John Deere GT275 to stay runing for more than a few second after starting. I then changed the Fuel filter, clean gas tank, new fuel, new lines since I saw crud in carb bowl and tank. NOW it5 will run after started either fast or slow BUT dies if load put on engine ie moving /blades. also dies if throttle moved from slow to fast. I checked the gas shutoff and it seems fine.

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  • 14 more comments 
  • rfhn May 04, 2010

    As part of the cleaning I had run a small wire through both the main post that attached the carb bowl and the jet that was mounted tothe post. Looking through both of these they look clear.

  • rfhn May 04, 2010

    please clarify "middle remove the screw its long with holes " I saw on the parts diagram that there was something inside the main carb post. I remove a small seating screw ( item 10 on the carb diagram) from inside it but nothing further would come out. Is this what I need to get out and claned?

  • rfhn May 04, 2010

    How does one remove the inner tubes from the carb bowl mounting post

  • rfhn May 04, 2010

    What does a carb rebuild kit entail? Did you see my comment of hhow to remove the inner tubes?

  • rfhn May 04, 2010

    I have a compressor and did blow it out. I have looked again at the JD parts diagram and there appears to be two inner tubes (item 9 &10 in carb parts diagram) with holes in them but the question is how to get them out. I remove the valve seat but no avail.

  • rfhn May 04, 2010

    Ok will not attempt. but how to clean the holes in them?

  • rfhn May 04, 2010

    From the parts diagram there appears to be two inner tubes each with holes in the sidewalls. Am I interpreting the diagram correctly?

    If I am correct how to clean these holes if I dont take them out??

  • rfhn May 04, 2010

    yes I do know what they are, I did clear / blow the center tube out but dont see how this would clear the outer tube ( #10) Did you look at the parts diagram



    http://jdpc.deere.com/jdpc/servlet/com.d...

  • rfhn May 04, 2010

    ...?

  • rfhn May 04, 2010

    govenor looks ok

  • rfhn May 05, 2010

    The gas shut retracts fully when 12v applied

    I have removed the carb / bowl aqnd run a wire through the holes in bowl mouting post (item 10) as well as the side jet(item 8).

    refering to rhe parts diagram what needle vale are ou refering to???

  • rfhn May 05, 2010

    looking for JD tractor mechcanic

  • rfhn May 05, 2010

    mcneb:: Does not look as if you have you read my comments

  • rfhn May 05, 2010

    This is the first time I have use this site , and didn't realize the my comments could only be seen after someone answers, (that sucks)

    I really think it is a fuel problem related to the junk coming from the feul line/ tank. Per the parts diagram I see holes in 9/10 but how to clean /remove Do you have experience with JD garden tractors

  • rfhn May 06, 2010

    Per your suggestion, I was able to remove #10 but not #9 Before I put more force on it I thought I woud ask you. I see a tube protruding into the main camber, was not sure , but assume it is the end of #9 . Do you agree it is the end of #9 ? I tried a coat hanger but was concernerd this would distort the end of the tube, My next idea is for a small threaded bolt with a nut on the end , hopefully this would apply even pressure. Does this sound ok to you?

    BTW the holes on #10 looked clear, so I not sure if this is the cause of my problem??



  • rfhn May 06, 2010

    How is the screen inside the tank?

    if refering to gas tank ok

    Is the carb clean ?

    bowl had some crud now clean

    and adjusted properly?

    have not chnged adjustmes

    How strong is the spark?
    Since it runs fine with throttle set to fast (with out load I assumed spark ok? jhow would I check?





    - If you can block the end it will cause a pressure build up.

    Compressed air can help blow out the lines through tank and lines.
    I have replaced lines, filter, cleaned tank, new gas

    will soak once I get #9 out.

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9 Answers

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  • Master
  • 440 Answers

Hi
Definitely sounds like a fuel starvation problem.
Did you clean out the carb jets?
A blocked (or partially blocked) main jet would do that.
So would water (or other contaminant) in the carb bowl

Otherwise it could be stiff blades due to an entanglement or
bearing corrosion

Cheers
Bike-Doc


Posted on May 06, 2010

  • steve May 06, 2010

    Hi again
    Just seen your comments
    The tube projecting into the carb venturi is the emulsion tube, these are press fitted in & have to be pressed out but being brass it must be done carefully !!
    If the side holes of the emulsion tube are blocked the fuel will not diffuse from the main jet

    Hope this helps
    Bike-Doc


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You still have crud in the carb. Use a can of starter fluid to keep it running when it starts to die and that will help clean out the carb. Joe

Posted on May 06, 2010

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  • Master
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You need to go back into the carb. In the center is a screw out jet that has some of that crud in it. Check the bottom screw for any stopped up holes, check the center jet for same, getting the carb clean is the key.

Posted on May 05, 2010

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  • John Fourteen Six May 05, 2010

    OK I think you have gotten to the jet I was referring to. The needle valve is hooked to the float, I think you have already checked this out. The center jet, the needle and the bottom main jet is about all you need to take out and clean. On top will be an adjustment screw. once all is back together, screw this screw in till it seats, then out for 1 1/2 turns to start. Start the engine, let it warm up. Then with your hand rev up the engine quickly and let it go and slow back down, look for a puff of smoke. Rev and adjust the screw till it will rev and puff with out any hesitation. Then try and run it to see if you have the power you need. You have checked the sparks. right?

  • John Fourteen Six May 05, 2010

    Yes you are right I did not see the majority of your post. This is one of the problems here, all I can see until I answer you is the first major question / post. Once I have answered that I can see all of your other return post to some unknown helper, who I can not see what they have said to you. So It looks like some one has already given you the same info I did. Other than try to adjust the air to fuel screw. Be sure you have checked the timing / plugs also. Make sure your carb to engine mount is not sucking air and no other leaks or loose gaskets. .

  • John Fourteen Six May 05, 2010

    Looking at your parts list. Screw #25 is the pilot air screw. This is the air to fuel screw I think needs adjustment now.

  • John Fourteen Six May 06, 2010

    Until recent I was a small engine mechanic. I have cert.s in Gas & diesel engines. Ran a small shop for 10 years, and yes some JD engine experience. To get to the jets #9 & 10 you will have to completely remove the carb to access. If they do not screw out you will have to make a puller out of some stiff wire like a coat hanger (could be either way screwed in or pressed in) Make a hook like tool to pull the jets out. The jets are made to come out. If you have a lot of rust in the tank you can put rocks and a little bit of gas and shake it to clean it out.

  • John Fourteen Six May 07, 2010

    Ok leave #9 for now. If you think there may be gunk in side. soak the carb. Get some Seafoam it is a carb cleaner and soak the carb in that fully submerged. then blow it out with air. From the parts list your fuel tank is plastic, I do not see a screen in the parts break down. Unsure of your comment. There again after you soak the carb. Pour the Seafoam down in the tank and swish it around for a while. I think after all you have done so far I would be ready to put it back together and try to get her running. As for the spark if you hook up a spark plug and ground the metal part to the metal of the block, turn the engine with the starter, you should be able to see the spark- should have a twinge of blue on the outside of the spark. You should be able to hear it if the engine freewheels after the starter quits. You can blow thru the filter backwards if you think it is stopped up, blowing thru it backwards will blow out stuff and you can see what it is.

  • John Fourteen Six May 07, 2010

    Looking at the carb. break down.. have you pulled # 15, that is a jet held in place by screw # 21. check that out if you have not yet.

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How is the screen inside the tank? Is the carb clean and adjusted properly? How strong is the spark?

Posted on May 05, 2010

  • Nate Stansfield
    Nate Stansfield May 06, 2010

    That would be the end of #9. If you can block the end it will cause a pressure build up. Compressed air can help blow out the lines through tank and lines. Do make sure carb is removed, disassembled, soaked in solvent. Floats look good and properly adjusted height.

  • Nate Stansfield
    Nate Stansfield May 06, 2010

    Blocking the end will cause pressure. The screen is in bottom of tank where fuel lines ares. Some tanks have shut off valves and the screen is directly above.
    Some lines are stuck on preety good. If you can brake it loose and have extra slack, so you can always replace it back on. When inserting the end back on the fitting, heating up the rubber will help it be flexible enough to fit back on.


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  • Master
  • 821 Answers

HELLO,SOME DIRT MIGHT BE STUCK IN THE CABURATOR SO YOU WILL have to blow the dirt out of the caburator by using CARB CLEANER AND A BRUSH.KINDLY CHECK THE BATTERY IF IT'S IN GOOD WORK AND ALSO CHANGE THE SPARK PLUG.ALL THIS ARE THE NECCESSARY THINGS THAT COULD CAUSE YOUR MOWER TO RUN AND STOP.

TAKE CARE.

Posted on May 05, 2010

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  • Master
  • 776 Answers

Hi,
I would want you to check first that if the fuel shutoff solenoid is fine or not and if it is pulling the pin back on its own properly, beause if that is the case then it will not let enough fuel by it to run. You will have to replace it then
In addition check to see if fuel line is pinched between tank and carb
Also few thiongs that you might want to recheck:
Did you remove the carburetor and disassemble it??? If you just blew through it, that is not good enough with this new gas. It leaves a sticky film on the surface of things. You have to use carb cleaner and a brush. and also remove the needle valve and wipe it with a rag. Also check your spark plug.

Posted on May 04, 2010

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Make sure the governor is operating correctly,under a load it is supposed to engage,spring loaded most of the time,also,you may have to check the fuel inlet ,and clean the carburetor again

Posted on May 04, 2010

  • Ronny Bennett Sr.
    Ronny Bennett Sr. May 04, 2010

    Is the governor moving under a load?It really sounds like not enough fuel,check the float level also.

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  • Garden Master
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U are in need of a carburetor overhaul, the dirt is in the jets of the carb, it is a 1 hour job, get a carb rebuild kit from the local dealer, there is no other issue except clogged carb jets that cause this symptom.

Posted on May 04, 2010

  • 4 more comments 
  • yadayada
    yadayada May 04, 2010

    it is very simple, there are only one moving part, you will need compressed air to clean out the dirt and dried fuel, if u don't have this have the shop do it, don't waste your time.

  • yadayada
    yadayada May 04, 2010

    U do not take those tubes out, if u attempt to do this u will destroy the carb.

  • yadayada
    yadayada May 04, 2010

    use a wire gauge drill (they come in a numbered set 1-60) bit that fits the tube diameter.

  • yadayada
    yadayada May 04, 2010

    WITH WIRE GUAGE DRILL BITS

  • yadayada
    yadayada May 04, 2010

    DO U KNOW WHAT WIRE GAUGE DRILL BITS ARE?

  • yadayada
    yadayada May 04, 2010

    good luck with this, until u get the carb leaned properly you will continue to have problems. What that cleaning will ultimately require is hard to say, if u allowed fuel to dry in the carb it may be permanently damaged.

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Hello my name is Heath it will be my pleasure to assist you. What you have is crud in the needle vale. Take the carb off and take the bottom bowl off turn the carb upside down you will see a brass screw head with ahole in the middle remove the screw its long with holes in it clean the holes out with a paperclip thats been unbent and then reinstall it and give it a try.

Posted on May 04, 2010

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