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  1. #1
    New Member
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    Dec 2010
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    3
    Tractor
    John Deere 790

    Default 2005 JD 790 Starts and Idles wont Run

    The tractor starts and Idles fine, recently changed out all fuel and the fuel filter. Any time the tractor is put into gear or even If i turn the PTO on, raise or lower the bucket... It dies? Any suggestions?

  2. #2
    Veteran Member foggy1111's Avatar
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    Dec 2008
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    2,486
    Location
    Nisswa, MN
    Tractor
    JD 3320 eHydro w/ 300CX Loader

    Default Re: 2005 JD 790 Starts and Idles wont Run

    Was the fuel and filter changed as a result of having the no-run problem?

    Do you have a shut-off valve on fuel filter? On?
    3320 eHydro, 300CX Loader & 15 + great attachments

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  3. #3
    Veteran Member Dutch445's Avatar
    Join Date
    Aug 2001
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    2,115
    Location
    Upstate NY
    Tractor
    JD X585

    Default Re: 2005 JD 790 Starts and Idles wont Run

    do you have any throttle response after you start it?
    (without operating loader/shifting etc)

  4. #4
    Elite Member RalphVa's Avatar
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    Dec 2003
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    3,758
    Location
    Charlottesville, VA, USA
    Tractor
    JD 1025, previously Gravely 5650 & JD 4010

    Default Re: 2005 JD 790 Starts and Idles wont Run

    I had this sorta happening last winter on my 4010. Found 2 globs of wax partly plugging the fuel outlet from the tank. Fished these out, and all has been fine since.

    Ralph
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  5. #5
    New Member
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    Dec 2010
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    3
    Tractor
    John Deere 790

    Default Re: 2005 JD 790 Starts and Idles wont Run

    Yea the throttle responds just fine, it will idle for an hour at just about any RPM, you can hold the clutch in... no problem. As soon as you shift into gear its like you turned the key off? same when you try to engage the PTO? If i give it some throttle when i move the shifter into gear it will hold on for a bit but eventually dies? it acts as though there is some sort of safety on the transmission that sees it going into gear and shuts it off?

  6. #6
    Veteran Member Dutch445's Avatar
    Join Date
    Aug 2001
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    2,115
    Location
    Upstate NY
    Tractor
    JD X585

    Default Re: 2005 JD 790 Starts and Idles wont Run

    sounds like a bad seat switch
    the tractor needs to be in neutral to start, there is a switch
    there, but also for it to shift, i believe the seat switch needs
    to be activated. that would explain the pto also, no seat switch
    signal and once you try to engage the pto, it kills the tractor.

  7. #7
    Veteran Member JDGreenGrass's Avatar
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    Oct 2009
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    1,578
    Location
    Maine
    Tractor
    John Deere 770

    Default Re: 2005 JD 790 Starts and Idles wont Run

    Agree...Maybe a switch is acting up.??
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  8. #8
    New Member
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    Jun 2010
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    20

    Default Re: 2005 JD 790 Starts and Idles wont Run

    The most likely suspect is an electrical switch, fuel and/or?, the manual has a comprehensive diagnostic section, I would start there. The instructions are pretty straight forward

    Keep us updated!!

  9. #9
    Elite Member
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    Jul 2006
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    4,409
    Location
    Northwest, WA

    Default Re: 2005 JD 790 Starts and Idles wont Run

    Quote Originally Posted by Dutch445 View Post
    sounds like a bad seat switch
    My thoughts also.
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  10. #10
    Elite Member
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    Jul 2006
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    Northwest, WA

    Default Re: 2005 JD 790 Starts and Idles wont Run

    Bear, this should help.
    (different serial #'s, as far as I can tell, one has blinkers,the other don't)
    Last edited by Willl; 02-03-2011 at 07:16 PM.
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