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Subject: PTO oil seal

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Jim Hay    Posted 07-23-2017 at 20:43:05 [URL] [DELETE]        [Reply] [Email]  
  • PTO oil seal
  • Trying to replace the oil seal on my 51 8N PTO. Whats giving me problems is that the bushing the seal rides on, 9N735B, was pitted and grooved from wear. So I decided to replace it too. The PTO shaft where the bushing fits is 1.122" in diameter. The ID of the new bushing is 1.117". That is a .005" interference fit. Seems like a lot to me. I heated the new bushing to a nice deep blue and tried to get it on but no luck. Fit ok on the splines but won't go past them. Destroyed the bushing getting it back off and will get a new one tomorrow. I have a lathe and am tempted to take the shaft down a couple more thousands in diameter. Is there some trick here I'm missing? Thanks

    Jim Hay    Posted 07-24-2017 at 19:45:08 [URL] [DELETE]        [Reply] [Email]  
  • Re: PTO oil seal
  • I went into town and got another bushing. It had a smaller ID then the 1st one. Bored it out on my lathe to 1.120. Got it warm but not blue and it slipped right on.

    Gaspump    Posted 07-24-2017 at 13:48:40 [URL] [DELETE]        [Reply] [No Email]  
  • Re: PTO oil seal
  • I have never found a collar that did not press on with little effort, never have used heat. Don't have a shaft or collar to measure at this time but my sources have been the CNH dealer or Just 8N's and they work. May use a little emery cloth on the shaft if it needs cleaning.

    Bruce Dorsi    Posted 07-24-2017 at 10:24:54 [URL] [DELETE]        [Reply] [No Email]  
  • Re: PTO oil seal
  • I'd be more tempted to hone or bore the bushing, instead.

    A bushing is much cheaper than a new shaft.

    Jim Hay    Posted 07-24-2017 at 10:49:57 [URL] [DELETE]        [Reply] [Email]  
  • Re: PTO oil seal
  • That's a better idea. I'll get a new bushing today and see what it's ID is. Maybe shoot for a .002" fit.

    Farmer Brown    Posted 07-24-2017 at 08:28:49 [URL] [DELETE]        [Reply] [No Email]  
  • Re: PTO oil seal
  • I went through that last fall. P.I.T.A. I do remember there are two different sized shafts, maybe you got the wrong bushing.

    duey    Posted 07-23-2017 at 22:39:05 [URL] [DELETE]        [Reply] [No Email]  
  • Re: PTO oil seal
  • Be sure to check the next new bushing Before you turn down the shaft... if that is what you are going to do... G'Luck

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