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JD 3020 synchro range can't get in to 3,5,7,8

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Mark in WI

04-02-2003 14:40:25




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1972 JD 3020 diesel SR

JD 3020 synchro range can't get in to 3,5,7,8 gears. Wondering if this is symptomatic of a simple adjustment or a more in depth transmission problem. Any feedback would be appreciated




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WTW

04-03-2003 10:25:00




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 Re: JD 3020 synchro range can't get in to 3,5,7,8 in reply to Mark in WI, 04-02-2003 14:40:25  
Mark, Not to argue with the other post but there is some common factors with your problem that you need to consider. First, all the gears that you are having difficulty with use the same "High" synchronizer. Second, the control rod that shifts / controls this synchronizer also controls the low synchronizers and if adjustment was your problem why does 1st, 2nd, 4th and 6th work?? If adjustment was truly your problem these other gears that are working should also be giving a problem. If you try to adjust out your problem, you will then cause the gears you have now working to be out of adjustment. My bet is with Larry that you will be doing some synchronizer work. Don't hurt to also tidy up all the wear points in the shift quadrant too as wear here will cause early failure of your new synchronizers. If you can feel the shift position "detents" when you put your transmission in a specific gear and the tractor does not move adjustment isn't going to correct your problem. Or if you problem is that the shift lever will not go into position unhook the control rod from your top shift arm on the right side of the transmission and then see if you lever moves into position. If it does you have a synchronizer piled up. If it doesn't the problem is in your shift linkage. Check it out and let us know what you find. Good Luck, Dave W.

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Mark in WI

04-03-2003 18:59:29




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 Re: Re: JD 3020 synchro range can't get in to 3,5,7,8 in reply to WTW, 04-03-2003 10:25:00  
The problem is more than just a linkage adjustment. It looks like I will need to split the tractor. How hard is it to work on these transmissions? Any Idea on the amount of money I am looking for parts for this - $500-$1000? More. Thanks

Mark



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Greg H.

04-03-2003 09:31:25




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 Re: JD 3020 synchro range can't get in to 3,5,7,8 in reply to Mark in WI, 04-02-2003 14:40:25  
My linkages on my 66 have a little slop in them too, and what I do is pay close attention to how I shift. As you go to shift into those gears, hold the lever over against the left guide, which will stop the downward motion, of the lever, at it's proper position, and not allow the lever to slip off to the right, and past the desired gear selection. if this happens especially in 7, and 8th, you will get the grinding noise. Just try to shift them in carefully, and avoid Jamming them, and you might be able to achieve good result, and have use of your gear. If not take some time, and find someone to help you adjust your linkages. At any rate good luck. Greg H.

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Gary Mckenzie

04-03-2003 06:11:30




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 Re: JD 3020 synchro range can't get in to 3,5,7,8 in reply to Mark in WI, 04-02-2003 14:40:25  
I agree, check linkage first. I recently worked on a 2520 with the same problem, a missing cotter pin allowed a clevis pin to come part way out and hit a bracket, preventing further movement of the shift rod.



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zane

04-02-2003 18:06:24




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 Re: JD 3020 synchro range can't get in to 3,5,7,8 in reply to Mark in WI, 04-02-2003 14:40:25  
Not sure, but I notice that all the gears you named call for you to pull the finger down, after having positioned the selector (pilot). Sounds to me like the left hand (pilot) shift linkage is out of adjustment. Be a cheap fix if that's the case.



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Larry W.

04-02-2003 14:48:09




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 Re: JD 3020 synchro range can't get in to 3,5,7,8 in reply to Mark in WI, 04-02-2003 14:40:25  
Sounds like a new synchro pack is in order. I have a 4020 here that is not yet that stubborn, but does not like to shift gears very easy. Wants to grind a little, and if on a flat level surface, when I shift between a forward gear and reverse, it moves back and forth a little. That is what all the local experts have told me. Sorry for the bad news, but hopefully I am wrong.



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