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  1. #1
    Silver Member Whitey's Avatar
    Join Date
    Dec 2007
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    249
    Location
    Slippery Rock, Pennsylvania
    Tractor
    Kabota B21 TLB

    Default JD 425 AWS - Runs but quits during mowing.

    Good Day!

    My wife's pet JD 425 (94 - 750 +- hours) has begun to give her problems. Seems she has had some starting issues the last few times she started to cut and then the mower would bog down and quit during the first 1/2 hour. Last weekend we took a look at the choke and throttle cables and the linkages in and around the carbrueator. Cleaning and lubing we thought we had the problem fixed. Alas that is not the case. She went about twenty minutes yesterday and it quit. We thought it was a fuel issue but the filter looks good and there is fuel getting to the engine. When it does run as soon as she engages the mower it bogs down and quits. Other threads have suggested a "Modulator"?

    Comments?

    Thanx!
    John Deere 425 AWS / 54" MMM / 54" Sno Blade / Kubota B21 TLB

    A patient man has great understanding; but a quick tempered man displays folly.

  2. #2
    Super Member
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    Mar 2008
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    9,475
    Location
    Northern Fingerlakes region of NY, USA
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    Kubota L3830GST, B7500HST, BX2660

    Default Re: JD 425 AWS - Runs but quits during mowing.

    What happens if (after it stalls) you remove the fuel tank cap, then try to start the tractor?

    Aaron Z
    A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
    Robert Heinlein, Time Enough for Love

  3. #3
    Elite Member Gittyup's Avatar
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    Oct 2007
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    Mid Atlantic
    Tractor
    Kioti CK25 Shuttle Shift, loaded tires, JD X739

    Default Re: JD 425 AWS - Runs but quits during mowing.

    Have you ever had the plastic cam replaced with steel? Could also be governor gear. Does it die if you just let it idle for 20 to 30 mins under no load. If so, might suspect something electric, like fuel pump or ignition module. Also could be an issue with the pot clutch. Letting it run for long period without load should be somewhat telling.

    When was last time you changed tranny fluid/filter?

  4. #4
    Silver Member Whitey's Avatar
    Join Date
    Dec 2007
    Posts
    249
    Location
    Slippery Rock, Pennsylvania
    Tractor
    Kabota B21 TLB

    Default Re: JD 425 AWS - Runs but quits during mowing.

    Thanks for the replys.............the good news is that it only took $20 for the part and a half hour of my wife's time to change it. It turns out that it was the modulator? The bad news is that this part is notorious for failing and is the result of many JD owners going to great lengths to figue out just what is wrong with their tractors. But since I / we belong to the greatest place ever (Tractorbynet) to find out how to fix problems from other members posts we are ahead of all the rest of the population.

    I just want to thank all of you whom do your best to answer anybody's question because you never know who will be looking at a thread and learning how to fix a particular problem.
    John Deere 425 AWS / 54" MMM / 54" Sno Blade / Kubota B21 TLB

    A patient man has great understanding; but a quick tempered man displays folly.

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