Please help!!! 4400 Won't Start
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    Please help!!! 4400 Won't Start

    I'm getting really bummed here guys, I need some help. One day I'm yelling YIPPEE and probably pissing off my neighbors while working later than I should, the next morning I have a dead tractor in the front yard. Maybe an angry neighbor come to think of it. I'm the 3rd? owner of a JD 4400 and no idea how many hours are on it, pretty sure the hours have turned over or stopped counting. It was working great one day, didn't run it out of fuel or anything, it just wouldn't start the next morning. Here's what I know, which is very little so please be gentle, I'm great at fixing houses and very much the beginner at engines.

    The engine turns over, new battery new fuel filter and all the fuel lines are flowing nicely, fuel pump seems to be operating.
    I cracked the injector lines on top, thinking there was air in the line, turned the engine over, no fuel came out.
    Maybe a fuel solenoid because it's not clicking when I turn the key? Someone said it should click. Before changing that I had a mechanic come by this morning and he ran an electric tester in the plug going to the solenoid and he said it's not getting power so must be a bad relay in the fuse panel or something before the solenoid.
    I bought a new fuel relay today, still nothing. The fuses were pretty dirty so I took all of them off and hit everything with a wire brush. No go.
    I checked the safety cut-off under the seat, it's been bypassed so shouldn't be the problem, right?
    The mechanic is thinking it might be an ignition switch but I'm hesitant to start changing parts just yet. A different mechanic says the injector pump. I'm thinking maybe solenoid, but the mechanic say's it before that. Where do I go from here?

    Any help would be much appreciated.

    Thanks in advance!

    Rob

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    AJgrn78's Avatar
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    Well Iíd say youíve done a good job so far narrowing down the problem, no power to that fuel solenoid seems to be the problem, so itís an electrical issue.

    You mentioned the seat switch is bypassed, I wonder if you have a problem with the neutral switch on the transmission?

    Is there a way to check the leads coming off the ignition switch to make sure itís sending 12 volts to the fuel solenoid?
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    This is where I show my lack of expertise. I have no idea what you just said. Neutral switch on the transmission? I'm sure I could check it if I new where or what it was. Are you thinking it may be stuck in gear? Would it still turn over if it was?

    As for checking the leads on the ignition...I know electricians who probably could. I do have a multimeter for working on furnaces, but I do that so rarely that I wouldn't know where to start on an engine.

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    ddinham's Avatar
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    Check to see if your PTO switch is turned on. That will keep it from starting. It might also keep it from turning over. So you might just have a fuel problem.

    Dave
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    I had a Cummins dealer tell me that I needed a $4,000 injector pump. I asked if it could be a something restricting fuel delivery, they said nope - the computer was indicating an injector pump problem.

    I left (without a new injector pump), found a small in-line fuel filter that was clogged, replaced it, then it ran fine - for a few hours. That little filter had clogged up again. I had to replace it a few times before the problem went away for good.

    I would recommend checking to see if there is an inline filter that needs to be replaced.
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    Captain Hook Kennyd's Avatar
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    IF it is cranking as stated, then it is NOT a safety switch as they will keep the starter from engaging.

    This series tractor (4200, 4300, 4400) had whats called a "thermistor" to operate the fuel solenoid, they quite often fail and cause the issue your having. It's only a $5 (or less) part but they can be a pain to change since they are wrapped up in the wiring harness behind the fuse panel assembly.

    Here are some threads to review:

    https://www.greentractortalk.com/for...entertain.html

    These are on TBN, scroll down past the adds:

    https://www.tractorbynet.com/search/?q=thermistor
    Attached Thumbnails Attached Thumbnails Thermistor.JPG
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    Quote Originally Posted by RobatRob View Post
    This is where I show my lack of expertise. I have no idea what you just said. Neutral switch on the transmission? I'm sure I could check it if I new where or what it was. Are you thinking it may be stuck in gear? Would it still turn over if it was?

    As for checking the leads on the ignition...I know electricians who probably could. I do have a multimeter for working on furnaces, but I do that so rarely that I wouldn't know where to start on an engine.
    The neutral safety switch is a switch on the transmission that prevents the tractor from starting unless it is in neutral, the idea being to prevent a tractor from being started in gear, accidentally or intentionally, and having someone get run over.

    Of course, as Kenny pointed out, this would prevent the tractor from cranking the engine (thatís what happens when I post replies after midnight, I knew that...)

    Regardless I think Kenny nailed your problem, good luck!
    Kennyd, rtgt, Herminator and 1 others like this.
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    2015 JD 1025r, 60d MMM, 54" front mounted snowblower, Heavy hitch, Ballast box
    1980 JD 1050 4wd, JD 75 loader, IH 60" brush hog
    1980? Satoh S550g Elk, 60" belly mower
    McCulloch Saws - 1970's Mini Mac 30; Mac 10-10
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    1996 Polaris 680 Ultra Snowmobile, 2004 Yamaha Raptor 660, 2016 Polaris Sportsman 570
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    Kenny has the answer.....it will look like a piece of CHICKLET chewing gum in that wiring mess. YES a pain to replace.
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    WOW!!! Thank you guys for such great help and quick response time, I should've come here long ago. Even if the suggestions don't work it's great to know this kind of help is available.

    Kennyd, I think I'm going to start there with the thermistor. I saw a guy on youtube with the same problem and he solved it the same way, but boy you are correct, it won't be easy to access. I removed the bolts holding the fuse panel and I believe I see the little "chicklet". This is the most room I can manage though. (see pics)

    I see this rod and bolt that appear to be for the steering and it might be pinning the wiring harness down, but I'm not sure. I THINK if I remove that bolt I might get a little more freedom on the wires but not much. Maybe not worth going that route?

    Any suggestions on how to get back there more easily. Every pic I find online shows people with oodles of room to work with.

    Thanks again guys!
    Attached Thumbnails Attached Thumbnails IMG_20190810_165051.jpg IMG_20190810_165112.jpg IMG_20190810_165131.jpg
    mjncad and Herminator like this.

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    Sorry, if I remove this bolt and/or it's harness, do you think it will free up some room on the cables? Am I opening up a can of worms by doing that?

    Rob
    Attached Thumbnails Attached Thumbnails IMG_20190810_165131.jpg

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