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8N Shifter

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eric in vt

08-25-2001 14:52:12




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I decided to do a little bush-hogging up back this afternoon on my '49 8N, since it was a picture perfect day here in Vermont. After a half hour of work, I went to put the tractor in reverse and when I let out the clutch, it stalled. I restarted it, let out the clutch in neutral, and went forward!!! I slowly drove the tractor into the barn and pulled off the top cover to check the shifting forks. I found that the shifter lever had ALOT of wear on it, causing improper movement of the forks. The bottom of the lever has two round sections, then above it, what should be a square section. The square section on my tractor is worn almost half way through. The forks in the tractor seem to have very little wear, which is good. I moved the forks manually into the neutral position and reassembled the top cover and can now shift properly. I would like to improve the situation so that I don't get caught like that again, and would like your opinion on what to do. I can think of three options:

1) Buy a new shift lever, if they are still available.
2) Try to find a used one that is not so worn (any suggestions on where?).
3) Build up the square section with weld, then machine it back down to stock size.

Please let me know your recommendations.

Thanks!

eric in vermont

PS- the only indication of wear I had was that on occasion, the tractor would pop out of 1st gear, especially if I was going down hill. I learned to keep my hand on the lever.

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Bill (VA)

08-25-2001 16:26:53




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 Re: 8N Shifter in reply to eric in vt, 08-25-2001 14:52:12  
Eric,

I have had similar problems and it turned out to be worn detents in the first - third shift rail. This was allowing two gears to be engaged at once.
I was able to remove the detent spring, clean the ball up and put in a slightly heaver spring. So far I have not had the problem happen again.

Bill



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eric in vt

08-26-2001 05:16:28




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 Re: Re: 8N Shifter in reply to Bill (VA), 08-25-2001 16:26:53  
Bill,

That's exactly what I think was happening- two gears at once! Assuming this is my problem (and not the wear on the shifter), is it possible to remove the detent ball through the top cover? What did you use for a heavier spring?

thanks,

eric in vt



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Bill (VA)

08-26-2001 16:56:19




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 Re: Re: Re: 8N Shifter in reply to eric in vt, 08-26-2001 05:16:28  
The spring and ball for the first third shift rail is accessed from the top. When you take the shifter plate off you should see a spring bact toward the seat.. the spring putts pressure on the detent ball and the ball will catch on the detents on the shift rail. If you move the rail forward you will be able to see the notches. You may want to see if the detents are warn too badly. My problem was tat the shift rail would slide back too far then the shiftter could not get back far enough to get it back out of this position. I took the sprong to the hardware store and matched it up to one that was the same diameter but longer. I had to experiment and cut it a little at a time. At one point I had so much pressure on the detent I could not shift it.

Good luck

Bill

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bg

08-25-2001 15:00:05




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 Re: 8N Shifter in reply to eric in vt, 08-25-2001 14:52:12  
I welded mine up and ground it back down to the original size.



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eric in vt

08-26-2001 05:13:26




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 Re: Re: 8N Shifter in reply to bg, 08-25-2001 15:00:05  
Was your tractor doing the same thing as mine? And did fixing the shifter help?

thanks,

eric in vt



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bg

08-26-2001 09:33:34




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 Re: Re: Re: 8N Shifter in reply to eric in vt, 08-26-2001 05:13:26  
It was really sloppy shifting and the pin that goes through the ball on top and sits in the slots on the cup was worn out. Plus the slots were worn. I put a new pin through the ball, welded up the slots on the cup and recut them and welded up the square portion of the shank and ground it back to the original profile. It shifts tight and solid, now.



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