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2N PTO sleeve shrink fit

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Bob - MI

10-02-2002 15:20:29

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Manual says the sleeve for the seal is a shrink fit. This probably explains why I can't get a puller to remove the old one. After I cut off the old one is the procedure to heat the new one with a torch and hope to god I'm quick enough to get it seated? Or is there some other clever way to do this?

Thanks in advance.

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Fred OH

10-03-2002 07:47:49

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Re: 2N PTO sleeve shrink fit in reply to Bob - MI, 10-02-2002 15:20:29

Bob, your right....hard to fool an old fool. It's nice to be able to foresee a potential problem before it happens. The secret, as I see it, is to heat the sleeve red hot all the way around. You shouldn't have any problems then as it will fall all the way on if you don't have any burrs. But, if the inevitable happens, I think you could make a new collar (hot or cold rolled steel) that slip fits on the shaft and loctite it in place as it just holds a bearing from moving. If not confident with that...a shrink fit is minus a .001" per each inch of diameter plus a .001" more. Example: For a 3" shaft....the collar would be bored 2.996". I myself, wouldn't be afraid to use the old one with a couple of tacks of weld to hold it in place....if I didn't have time to make a new one. Your mileage may vary. L8R....Fred OH

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SteveB(wi)

10-03-2002 05:28:57

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Re: 2N PTO sleeve shrink fit in reply to Bob - MI, 10-02-2002 15:20:29

You gotta be quick. I did mine this spring and heated it up with the torch, only got it on about 3/4. Took it to work and heated again and used the big press to push it on. It doesn't have to be perfect on location, just be in the right place for the seal rubber to ride on it.

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Bill 52 8n

10-02-2002 20:55:07

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Re: 2N PTO sleeve shrink fit in reply to Bob - MI, 10-02-2002 15:20:29

Bob

Not familiar with the exact sleeve you mean (not much n experience), but if the sleeve fits over the shaft, then yes I would heat it up and slide it on the pto shaft, and it would shrink as it cools. Is the shaft out of the tractor? If you can sneek it by your wife and hide it behind the hotdogs, or put it in the basement freezer, freeze the shaft so it shrinks, and you wont have to heat up the sleeve as much.
Just my thoughts, I'm sure someone else has had experience with it.

Bill

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Bob - MI

10-03-2002 12:24:24

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Re: Re: 2N PTO sleeve shrink fit in reply to Bill 52 8n, 10-02-2002 20:55:07

Thanks to all who commented. I've had a boat load of surprises while doing a tear-down to replace a broken pinion gear. I was a machinist for many years and honestly without that experience I'm not sure I could easily make it through this project. I always try to avoid using a torch whatever I'm doing because I know how excess heat can degrade metals.

I've sold aerospace products for many years and have seen lots of bearings and bushings get press-fit after soaking in liquid nitrogen. Not sure if the Ford boys resorted to that one but it sounds cool.

Thanks again

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