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JD A-Opinions Wanted

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dwm

06-11-2003 13:55:30




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As posted earlier, been having carb problems. Now have the float soldered and holding again (thanks Clooney). But before that, crankcase received about 2 quarts of gasoline. Got that much oil/gas mix out of the test cock. The mixture was thin and black, the new 30W had not been in there but a couple of weeks. When draining at the plug, (2) .375" [3/8"] ball bearings came out of the bottom of the crankcase.

Now the questions--Where could these ball bearings have come from? Since the tractor seemed to run and drive fine just before this event, my present assumption is that these must have been left from an old fix (of what??) at some other time in the tractor's life, and that the gas in the oil acted as a solvent and loosened up a sludge pocket somewhere in the crankcase with these ball bearings in it. Still we're a little scared to run it without checking out where these could have come from. There is a ball bearing in the governor, but we've checked it and the balls are smaller. Any help or ideas appreciated. dwm

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chris in wi

06-12-2003 09:50:57




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 Re: JD A-Opinions Wanted in reply to dwm, 06-11-2003 13:55:30  
Those balls, I'm afraid, ARE from your governor!

I don't know what bearings you were looking at, but there are two sizes of ball bearing on your governor. I have a '46 "A" (same tractor, essentially) on which the governor bearing failed *exactly* the same way!

Since I opted to buy a replacement governor/fan assembly (which you should do too, as the bearings are expensive!) at a junkyard, I still have the old governor and parts and will post photos of exatly the failure you experienced. The bearing that failed is the one on the outside of the gear that meshes with the fan drive gear (behind the magneto).


DON'T USE YOUR TRACTOR UNTIL YOU FIX THIS.

You could end up with a lot of broken and ground up parts in the end, and it's an easy fix.

Check out the photos at this link (which will be up in a minute...):

Link


chris

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dwm

06-12-2003 19:10:27




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 Re: Re: JD A-Opinions Wanted in reply to chris in wi, 06-12-2003 09:50:57  
chris in wi,
That is the size, this is exactly the info we were looking for. Since we just got this tractor a month or so ago and don't know its history, the next question is: Are these from an earlier repair? We'll have to check it out. Thanks very much for your pix and help. dwm



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chris in wi

06-12-2003 10:03:26




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 Re: Re: JD A-Opinions Wanted in reply to chris in wi, 06-12-2003 09:50:57  
On second thought, it could also have been the bearing on the other end of the governor shaft. If you look at the top picture on the website in the previous posting, you'll see that there is a complete bearing just like the failed one on the floor at the end of the ruler. this is from the other end of the governor shaft.

Chris



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DP

06-11-2003 15:29:45




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 Re: JD A-Opinions Wanted in reply to dwm, 06-11-2003 13:55:30  
You don't say what year A you have. As for bearings, theres the cam bearings, govenor shaft bearings, and rear fan shaft bearing come to mind. If theres just one ball out so far you probably wouldn't notice it, but it will only get worse. Good luck in your search!



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dwm

06-11-2003 16:05:03




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 Re: Re: JD A-Opinions Wanted in reply to DP, 06-11-2003 15:29:45  
It's a 1945 A. The cam bearings are ball type? It's hard to tell from the manuals whether they're ball or roller. We've got two.....dwm



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DP

06-11-2003 18:14:26




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 Re: Re: Re: JD A-Opinions Wanted in reply to dwm, 06-11-2003 16:05:03  
I think your right on the cam bearings. I will have a look in a bit. Those are probably timkin, as the spring holds the tension on them.



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AC

06-11-2003 19:13:27




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 Re: Re: Re: Re: JD A-Opinions Wanted in reply to DP, 06-11-2003 18:14:26  
pull the l.h. cam bearing cover located at 11:00 o clock of the flywheel. A lot of left hander's went bad. I have replaced two so far this year. They are ball. the r.h. side has the spring preassure on it. let us know...AC



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dwm

06-11-2003 20:58:01




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 Re: Re: Re: Re: Re: JD A-Opinions Wanted in reply to AC, 06-11-2003 19:13:27  
That left cam bearing cover has a grease fitting on it, is this an attempt to save these bearings? They have a history of problems?
Can you pull the left cam bearing/cover without releasing the valve train or tension from the right side? dwm



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Robert

06-12-2003 08:49:01




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 Re: Re: Re: Re: Re: Re: JD A-Opinions Wanted in reply to dwm, 06-11-2003 20:58:01  
The cam bearings on my '45 A are roller, NOT ball.
There's really no way to misalign the valve train by pulling the left cover, since the spring pressure from the right side pushes the cam gear against the case---only about a 1/2" movement or there abouts.



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dwm

06-12-2003 19:02:12




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 Re: Re: Re: Re: Re: Re: Re: JD A-Opinions Wanted in reply to Robert, 06-12-2003 08:49:01  
Thanks Robert for confirming. In reading through the archives on cam bearings, I came to that conclusion. We can't really figure out where these two large ball bearings came from. It is running fine with no unusual noises. dwm



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