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JD 50 jumps out of 3rd gear

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Kerry Miller

08-21-2001 11:53:47




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I guess something is worn somewhere, it's probably spent a lot of time plowing in 3rd gear, but here goes. I can pull my shredder in 3rd, no problem, but if I put a load on it like my 6 ft disk it will pop out of gear in a few minutes. It does fine in 2nd or 4th, but one is too slow and the other is too fast (as apparently somebody found out for decades before I got it!) Is there an easy fix or adjustment that will keep it from jumping out of gear when I'm plowing?

Thanks,
Kerry

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Kerry

08-23-2001 07:32:46




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 Re: JD 50 jumps out of 3rd gear in reply to Kerry Miller, 08-21-2001 11:53:47  
Thanks for the info guys! Let me answer a couple of questions. When it jumps out, I can stop and put it right back into 3rd gear and go on. I did try resting my foot on it to see how hard it came out but when it popped out it really came out hard so I don't think I want to try anything to wedge it in, it might break something.

Sounds like for this year I'll use either 2nd or 4th gear (I'm only plowing 5 acres) then look for some second-hand parts. I'll dig out my I&T book to see if I can figure out what you guys are talking about! I've worked on engines a lot but never spent much time on the transmissions.

Thanks for the help!

Kerry

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Chuck

08-22-2001 11:53:08




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 Re: JD 50 jumps out of 3rd gear in reply to Kerry Miller, 08-21-2001 11:53:47  
locking shifter used on the later run 50's as this problem was a major problem. Many B's were retro fitted. Locking shifter uses a two piece shift that has to be moved to disengage the detent pin. The later run 520s also used a similar device for the high-low range as they had problems with them drifting out when on the road. But the shaft probably needs renewing before installing. Generally the gear doesn't wear but the shaft will wear badly in the 1/3 position. It will actually cut a bur in the upper shaft. Under a hard pull it will spit the gear side ways. Repairing pins or springs will not do any good. It will also creep out when using reverse. Believe me the only thing that will restore the tractor is a tear down and install better parts. Need to have someone that knows what their doing till you get the hang of what's going on.

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Darryl

08-22-2001 05:14:04




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 Re: JD 50 jumps out of 3rd gear in reply to Kerry Miller, 08-21-2001 11:53:47  
Same thing happens on a B if there is some sort of wear in the gearbox. Mine has a block of wood that is jammed in the gear slot when you don't want it to pop out. That should only be a temporary fix. The permenant one will require quite a bit of work.



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Joseph Stephenson

08-21-2001 21:35:43




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 Re: JD 50 jumps out of 3rd gear in reply to Kerry Miller, 08-21-2001 11:53:47  
The best thing to do is find a junk 50 JD and pull the third gear out of it and put it in your's. It is very clear that it is no good if it is jumping out of gear when you put it under a load. Or pull your gear out and find a good machinist and have him make you a new gear.



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Jack Yates

08-21-2001 19:56:53




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 Re: JD 50 jumps out of 3rd gear in reply to Kerry Miller, 08-21-2001 11:53:47  
Hm. When you say "It jumps out of third gear" do you mean that the lever moves to the right in the 3rd gear slot and you can get it going again by repositioning the lever in that slot or do you have to move the lever out of the 3rd gear slot and down to the bottom slot, (the gate between the 3-5-6 side and the 1-2-4 side) and reposition it full-left, then go back to the third gear slot?

If the former, grinding the shift gate probably won't help, if the latter, grinding the left end of the lower slot until the lever gained full travel worked on my tractor; hasn't popped out of third since.

You can email me for the details if you're interested; I'm not able to get to this forum as often as I'd like to.

[email protected]

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Chuck

08-21-2001 13:29:12




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 Re: JD 50 jumps out of 3rd gear in reply to Kerry Miller, 08-21-2001 11:53:47  
sorry but no easy fix. The main reason for jumping out is wear on the uppershaft from excessive use in the working gear. They do offer a locking shifter for the 50, but first you need to renew the shaft with one with less wear, probably a transmission tear down with new countershaft bearings also. The best is to fix it right to avoid major damages.



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Craig MN

08-21-2001 18:33:52




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 Re: Re: JD 50 jumps out of 3rd gear in reply to Chuck, 08-21-2001 13:29:12  
Tell me more about this locking shifter. I've heard of it before but have never been able to find any official information about it.



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Jim Broughton

08-21-2001 18:43:56




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 Re: Re: Re: JD 50 jumps out of 3rd gear in reply to Craig MN, 08-21-2001 18:33:52  
Probably wear is indeed the factor, but just in case, check the air pressure in your rear tires... I had an "A" once that jumped out of gear if the tire pressure wasn't the same !!
Lots of luck! Jim



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andy

08-21-2001 15:32:10




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 Re: Re: JD 50 jumps out of 3rd gear in reply to Chuck, 08-21-2001 13:29:12  
ive heard of people grinding out the shifter guide plate so it would engage more



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Chuck

08-21-2001 18:24:24




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 Re: Re: Re: JD 50 jumps out of 3rd gear in reply to andy, 08-21-2001 15:32:10  
grinding the shifter will not help, I've know of people chaining the shifter only to have the side thrust break the shifter. You have to solve the wear problem at the source.



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