4640 Quad Shift Lost 1st & 2nd Gears
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Thread: 4640 Quad Shift Lost 1st & 2nd Gears

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    4640 Quad Shift Lost 1st & 2nd Gears

    This is my first post. I am a weekend farmer, who got tired of throwing wrenches at my red tractors, and bought a 4640 a year ago. It is a quad shift with a cab and with one of the late serial numbers in that series, built I think in 1983.

    For the first time in years, I have a good stand of corn in my duck hole, but it cost me 1st and 2nd gears on my quad shift. It happened suddenly. The gears lightly grind and it moves a little in first and second in any range. It works fine in third, forth and reverse gears in any range.

    My research indicates it is a broken shift collar. I have checked cab mount bushings and adjusted linkage.

    A JD mechanic said the top gear would need to be rebuilt and priced the parts only from John Deere at $7,000. I am a broke public servant with kids in college and simply canít afford to fix it. My old IH 1566 needs a $3,000 rear end replacement.

    I suspect installing used parts would not last. Would installing an entire used gear housing with gears already in it be better? Would it hurt to run it in third and forth? Any suggestions?

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    johnH123's Avatar
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    Can you turn a wrench? a shift collar doesn't cost 7000 bucks, more like 1-200.
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    You'll get more responses with having this posted in the "Agricultural Tractors" forum, I'd imagine a moderator will come along and move your post for you.

    Good luck!
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    Keeper of the GTT Cookies dieselshadow's Avatar
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    Quote Originally Posted by AJgrn78 View Post
    You'll get more responses with having this posted in the "Agricultural Tractors" forum, I'd imagine a moderator will come along and move your post for you.

    Good luck!
    When you see something like this, itís much easier to use the ďreport postĒ button. It gets our attention pronto and does so anonymously.

    And no worries, itís not a big deal.
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    Welcome to GTT
    It's my guess that the synchronizers are worn out on 1-2 gears. To repair one needs to R&R cab then split tractor to R&R top shaft in trans. I think you'll be fine driving it while not attempting to put in 1-2 speeds
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    Quote Originally Posted by Tx Jim View Post
    Welcome to GTT
    It's my guess that the synchronizers are worn out on 1-2 gears. To repair one needs to R&R cab then split tractor to R&R top shaft in trans. I think you'll be fine driving it while not attempting to put in 1-2 speeds
    Thank you. I think Iíll drive it to a friendís shed to try do the split myself and get a real JD mechanic to do the gear work. Does anybody know of a good post, manual or video I should view before tackling a split?

    I think his $7,000 parts list covered every part in case more parts are worn out on the top shaft. Does anyone think replacing the entire transmission with an intact used one would be cheaper or better than rebuilding the top shaft?

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    Quote Originally Posted by Jim Hood View Post
    Thank you. I think I’ll drive it to a friend’s shed to try do the split myself and get a real JD mechanic to do the gear work. Does anybody know of a good post, manual or video I should view before tackling a split?

    I think his $7,000 parts list covered every part in case more parts are worn out on the top shaft. Does anyone think replacing the entire transmission with an intact used one would be cheaper or better than rebuilding the top shaft?
    I doubt it. I suppose it depends on how many hours are on it and if the transmission is making other noises. If 1st and 2nd are not critical I agree with the post above. Let it be and make sure there are not other issues. Other members who work on these might have a better idea.
    Last edited by Herminator; 06-07-2018 at 06:29 PM.
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    I'd suggest to either drive as is or renew top shaft with new synchronizer's vs install used trans parts.
    BigJim55 likes this.

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    Quote Originally Posted by Tx Jim View Post
    I'd suggest to either drive as is or renew top shaft with new synchronizer's vs install used trans parts.
    I agree, synchronizers are a wear part, get new not used.
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    I can understand the $7000.00 parts estimate. As a dealer that is going to guarantee his work, you can't afford to replace only the one or two items that is causing the immediate problem. And as a customer you shouldn't want him to. The labor costs will be substantial and if another part on the top shaft fails a month from now because it was 80% worn out during the first repair, you would expect the dealer to repair it for free. If you agreed to no warranty, then you would be charged the $3000-$4000 labor in addition to the extra parts. The transmission pump is removed to repair the top shaft, and many times they show substantial wear if the tractor has lots of hours. That alone is Approx $2500.00. The third and fourth gears are on the same shaft as well as reverse. SHift forks are removed and shift cams. It doesn't make sense to put substantially worn parts back in when it is already apart. If you are able to perform the job yourself and don't mind risking doing it again, then that is your choice. The synchronize assembly alone is $1500,, and the 2 drums and gear that goes with it are average of $500 each, so that is $3000 bare minimum parts to fix the immediate issue, and that doesn't include gaskets, seals, shims, oil or filters. Transmission repairs are VERY expensive.

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