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John Deere Tractors Discussion Forum
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fanshaft hitting tube on late B need help

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Ken in MN

10-10-2007 08:07:32




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I am working on a B serial 285312, the fanshaft is hitting the tube at just above idle. I replaced the bearings in the governor and the fanshaft, set up gears, reassembled, same problem. Next, I bought a used fanshaft that had no indication of "whipping" as JD SM2004 mentions, installed that,re set the gears, same exact problem at the same RPM. I have no means of measuring exact RPM, but it is at what I would call fast idle. At faster or slower speeds, it is fine, just at that certian RPM it hits and makes a terrible racket. The local JD guru and I are stumped. I am hoping one of you have suggestions/ solutions for this. I even loosened the front support to move it around with no change. Any help is greatly appreciated. Thank you.

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Ken in MN

10-11-2007 16:50:53




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 rechecked everything, still hits in reply to Ken in MN, 10-10-2007 08:07:32  
I tore it back down again this morning, double checked all specs, rechecked that all parts were there and installed correct, even checked out ventilator pump. Replaced the fan and put it on the right way. I checked the nose for wear like Mike M suggested, no play at all. Shaft still hits at that certain RPM. I'm out of ideas, except to try and find an N.O.S fan shaft.



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Mike M

10-11-2007 19:23:47




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 Re: rechecked everything, still hits in reply to Ken in MN, 10-11-2007 16:50:53  
I only wish I was next door so I could come over and see/hear for myself.

Are you sure it is hitting the inside of the tube ? And not just the fan blade hitting the shroud. Do you think it is in the center from flexing or at an end ? Those shafts are pretty stiff to flex ? As I have beat pretty hard on some of them to get the fan disks to move back.

Does the engine seem to vibrate alot like if the fylwheel or clutch driver are on wrong throwing it out of balance ?

Just trying to think out loud and maybe stumble across a solution. This one really seems weird. Bring it on over as I love a challange. Ohio is a ways away though.

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Ken in MN

10-12-2007 16:45:27




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 Re: rechecked everything, still hits in reply to Mike M, 10-11-2007 19:23:47  
Hi Mike, The shaft is definetly hitting in the center of the tube. I listened with a stethoscope, and you can feel it with your hand. I put a different governor gearset in this morning just to see if any thing would change. Same exact problem. The clutch driver and flywheel are where they are supposed to be, and there is no vibration while running. The blades are'nt hitting the shroud. I have put a straight edge all the way around the tube, no bends.
If it was'nt so much work, I would swap governor and fanshafts with my dads B and see what happens. If I find the solution, I will definetly post it to spare someone else this frustration. Thank you for taking the time to help.
Take care.
Ken

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Mike M

10-12-2007 18:28:16




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 Re: rechecked everything, still hits in reply to Ken in MN, 10-12-2007 16:45:27  
That is sure a puzzler ? I was also wondering if your gov. weight pins and holes were loose causeing the weights to hit the gov. case making noise. But this should be noticeable at the gov. housing and I doubt it would travel up that tube. Good luck finding it. I wish I could help more. Like I said before I love this kinda challenges and won't rest til I get to the bottom of them. If at first you don't succeed try try again as they say. I have had my fair share of trial and error ! For sure report back.

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Ken in MN

10-10-2007 15:51:37




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 Re: fanshaft hitting tube on late B need help in reply to Ken in MN, 10-10-2007 08:07:32  
I replaced the bearings in the governor, and also had the left cam bearing rebushed, as it was really bad. I did set up the gears by bolting everything together on the bench and changing shimms to get the gears to mesh properly. I did a lot of studying/ staring at the parts book and tractor and have determined the fan is on backwards, but was that way before I started on it. I'm going to take it back apart in the morning and flip the fan, crossing my fingers. I will post back with the results. The gear on the fanshaft and bevel gear on the governor are worn some. Could that cause it?
Called the owner of the tractor, he said this noise has been there since he bought it a few years ago, only it has gotten much louder recently.

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Mike M

10-10-2007 12:54:52




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 Re: fanshaft hitting tube on late B need help in reply to Ken in MN, 10-10-2007 08:07:32  
Is the inside of the frt. housing worn where the bearing sits ? I have had some worn there and had to replace or build up and remachine. Same goes for where the bearing sits on the shaft it can wear into them too.



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Mike M

10-10-2007 11:43:56




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 Re: fanshaft hitting tube on late B need help in reply to Ken in MN, 10-10-2007 08:07:32  
I would suspect something assembled wrong or a spacer missing in that assembly. I had an A once that was missing a spacer in there and the fan blades were on backwards by someone else before who was in there. Do you have a parts book ? if so study it real close as it may hold the clue to what is missing.



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Waterloo

10-10-2007 09:24:58




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 Re: fanshaft hitting tube on late B need help in reply to Ken in MN, 10-10-2007 08:07:32  
Ken, I would check the two bearings in the governor housing. And possibly the two bearings on the cam. Typically when I rebuild the fan shaft (a common problem) I also set the governor housing apart to set the back lash in the gears. I have found these bearings typically go bad when the bearings in the fan shaft go out. This is just a guess.



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