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John Deere Tractors Discussion Forum
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B governer

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johnlobb

01-04-2007 08:06:54




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Thanks again to F-I-T, the inner bearing split just like you said. I used my dremel with a small thin wheel to score it 180 deg apart. Now the governer shaft will not go in to the gov case enough to put the end cap on. Does the gov gear that engages the camshaft gear line up exactly with it? The gov gear seems to be out from the cam gear about 1/4". I cannot remember if these 2 gears line up exactly. If they do, it probably would go together.

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Mike M

01-04-2007 08:12:19




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 Re: B governer in reply to johnlobb, 01-04-2007 08:06:54  
Do you have the Mag. or Dist. off. If not you will bust it. There is a spring in there pushes that whole assy. over to the left and the gear and shaft will turn as they go in. You should be able to push it all the way in by hand pressure BEFORE you draw up the bolts. Sometimes those new bearing fit tight and you have to make sure the race is started in. A small thin screwdriver sometimes can pop it into place as you go together.

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johnlobb

01-04-2007 08:16:18




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 Re: B governer in reply to Mike M, 01-04-2007 08:12:19  
Yes, I do have the mag off, and I can feel some spring pressure pushing back, but it does not feel like it wants to go in far enough. It seems to lack about 1/4".



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F-I-T

01-04-2007 10:02:01




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 Re: B governer in reply to johnlobb, 01-04-2007 08:16:18  
Mike is right on. Are you using the original thrust bearing (mag end) that you originally had, or is this a different shaft all together, with maybe a slightly different wear pattern on the thrust bearing? The case could be scored at the mag end (common) and that might not allow the thrust bearing to walk into the bore completely. You might have to remove the snap ring and run a brake cylinder hone down there to remove a slight ridge. 60 grit SC cloth might also do the trick. The thrust "assembly", spring and all, will have to compress up against that snap ring in the bore where the mag drive end goes. THe gear, when everything is in place, will sit flush and in-line with the cam gear. You see that with a mirror if you take the crank cover off and shine a light. Otherwise, take my word for it.

What year "B" again, and where did you get the shaft? No pun intended.

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F-I-T

01-04-2007 10:17:39




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 Also, the fanshaft... in reply to F-I-T, 01-04-2007 10:02:01  
Are you jiggling the fanshaft to make sure the gears mesh together?



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johnlobb

01-04-2007 12:45:12




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 Re: Also, the fanshaft... in reply to F-I-T, 01-04-2007 10:17:39  
I did get the cover on, but in reviewing the procedure in the service manual, it says I need 1 thick and 2 medium gaskets under the gov end cover to properly set the preload or lash. I called my JD guy and he is ordering them. I really appreciate all the input from Mike M and F-I-T. The only way you learn is to do. I have found most or a lot of my motorcycle and car mechanic ability does not apply to these old machines. I also found the timing between the gov gear and the cam gear to be off by 1 tooth. When the timing marks line up on the flywheel, the mag slot on the right end is horizontal.(After I moved it 1 tooth)

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Mike M

01-05-2007 04:47:18




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 Re: Also, the fanshaft... in reply to johnlobb, 01-04-2007 12:45:12  
What all did you change in that Gov. ? Did you also change the RH bearing. If the LH was bad I can't imagine the RH is any better or fanshaft too. Also did you save you old shims/gaskets ? These are helpful to measure the thickness to set it all back if you didn't change very much inside.



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F-I-T

01-04-2007 14:28:53




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 Re: Also, the fanshaft... in reply to johnlobb, 01-04-2007 12:45:12  
Well John, you're not home free yet. Those shims are used to set the lash of the governor shaft bevel gear into the fanshaft bevel gear, and you can't just throw shims in there and think it's set right. If you don't use enough shim, the teeth will bottom out and shell those teeth out in no time, so it is better, though not wiser, to use more shims than too few. At least with too much clearance you may have a noisy, rattly governor to fanshaft drive that will probably keep its teeth for a while.

To set that clearance the right way, you would remove the fanshaft and the governor case and bolt them all together, then use a dial indicator to set the lash after adjusting the fanshaft front shims for proper heel. THEN, you should use some sort of rub indicator like Prussian Blue layout grease to see exactly where those gears are contacting. Just like setting up a ring and pinion in a car rear end.

Again, to do this right, you have lots more work to do.

Sorry.

Frank

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