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Excessive wobble in PTO

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Paul

09-20-1999 12:10:38




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A couple of questions. My PTO output shaft seems to have a lot of play in it. When I hook it up to my wonderful little Mono bush-hog, I feel like I should be wearing a helmut in case something flys off. It's my first tractor, and I don't have anything to compare it to, or books...Is the splined portion pinned onto another shaft? Also, would the bush-hog use 90W as lube? And from an earlier post about 3 pt. arms setting too low, could someone explain a little further on how that can be adjusted? Thanks for the help, it's a great board. Oh, while I'm asking, I thought what I have was a late 8N, based on one persons comments about only the last couple of years of 8Ns having the angled distributor. It is definitely an 8N, but I want to nail dwon the year. Tell me where to look for the numbers, and I'll post them so someone can clue me in. Thanks again!

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Mike in NC - Caution!!!!!!

09-20-1999 13:06:17




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 Re: Excessive wobble in PTO in reply to Paul, 09-20-1999 12:10:38  
Paul:
You definitely don't want lots of vibration and a loose PTO when you brush hog!!!! Lots of danger here! First things first: If you don't have an over running coupler - don't brush hog. Lots of opportunity to run into trees, fences and barns when the inertia from the "hog" pushes you forward when you want to stop. Next: Lots of play and vibration can tear up the PTO and/or twist the coupling off the brush hog which will lead to lots of exciting things - none of them good for you or your N. Your post is not clear. Is it your PTO shaft that has lots of play, or do you actually have an ORC that has lots of play? Either way - please repair before you fire up that brush hog.

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Paul

09-20-1999 13:41:16




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 Re: Re: Excessive wobble in PTO in reply to Mike in NC - Caution!!!!!!, 09-20-1999 13:06:17  
I'll admit to a little more ignorance here-what's an OCR look like? You are right about twisting the coupling off the bush-hog, it has happened three times already. If I assume that the splined shaft-with one through hole, and a recess in the splines (for another bolt in the coupler to hold it captive to shaft), is the OCR, then I guess it's just a matter of removing this and somehow concentically shimming it up, right? Assuming the main shaft itself doesn't have much play. Also, when I was replacing the center part underneath of the bush-hog, after replacing the blades, I think as I was tightening up the main nut I probably turned the PTO against the way it normally turns, (I had the coupler attached at the time-probably not a good practice in itself). Will that do any damage, or is it racheted? Thanks again for the help, you may have just prevented some real injury, and at 35 I may be past my prime, but I think the N is just hitting it's stride.

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Geoff in MN

09-20-1999 21:49:55




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 Re: Re: Re: Excessive wobble in PTO in reply to Paul, 09-20-1999 13:41:16  
I'm gonna throw my 2 cents worth in here not because I know everything but because you Paul, you are not past your prime at 35, but you may be if you continue to operate machinery like this. First off, I'm not so sure you have an ORC. It's a piece shaped like a potato masher that fits over your original PTO splined shaft and it does ratchet. It terminates as another splined shaft and sometimes is a size adaptor going to either a 1 1/8" shaft or a 1 3/8" shaft. There should be very little play between the implement drive shaft and the tractor PTO shaft. Another thing to consider is the implement shaft itself which is most often 2 squared halves (male-female) and usually has a U-joint at each end. Shorter driveshafts must have the U-joints aligned properly or there will be some serious vibration. I can't remember right now (I'm sure somebody will know) but the yokes of each U-joint must either be parallel or at right angles to achieve less binding. You may also want to check and see if the implement shaft itself is too long and is "bottoming out" inside. Don't take too much off though. Finally, to achieve the proper height with your mower, you should have check chains installed. Do a search on this site for more info about that. Good luck and thanks for seeking help.

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slim

09-21-1999 06:29:13




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 Re: Re: Re: Re: Excessive wobble in PTO in reply to Geoff in MN, 09-20-1999 21:49:55  
My two cents worth. I'm not very familiar with N's, but could Paul be putting a 1 3/8" implement coupling onto a 1 1/8" PTO shaft and just need a bushing. This would cause lots of vibration and play in the connection also. Of course an ORC would take care of this also.



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Dennis N Tx.

09-20-1999 12:45:52




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 Re: Excessive wobble in PTO in reply to Paul, 09-20-1999 12:10:38  
It sounds like you have an "ORC" on your PTO shaft. I put one on my tractor last Friday and noticed some play on the shaft also. It operated very well. This would be a good question for Dell (WA) as to the play, if its normal.

All N-Tractor serial numbers are on a flat area just above the starter about 4-6 inches and just below the cylinder head seam. They start off like 8N######.
1947 (8N) Serial number 1 - 37907 1948 Serial number 37908 - 141369 1949 Serial number 141370 - 245636 1950 Serial number 245637 - 343592 1951 Serial number 343593 - 442034 1952 Serial number 442035 - 524076

Dennis
8N48II82

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