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Subject: Putting 8N back together

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Cal Sexsmith    Posted 08-31-2019 at 19:24:12 [URL] [DELETE]        [Reply] [Email]  
  • Putting 8N back together
  • I am putting my 8N back together after replacing the ring gear. The two halves of the tractor are about 1/2" apart, but don't want to move any further. On the advice of others I made up two 6" dowels from threaded rod to guide the two halves back together. I aligned the splines on the transmission shaft by rotating the PTO and that seems to have worked OK. I have also been told not to force things or try to draw the halves together using bolts. I am assuming something is slightly out of alignment, but I don't know what. The back half is currently supported by a floor jack on wheels and the front half on a hydraulic bottle jack. Should I raise or lower either or both halves? Do I need to separate it and try again? Any suggestions are welcome.

    K.LaRue-VA    Posted 09-01-2019 at 11:05:55 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Putting 8N back together
  • Excellent choice to stop and find the problem rather than forcing anything. Check for misalignment all the way around the bellhousing. Guide pins help a lot, but it is still possible to have both ends too high, too low, or angled in some way. It might take a tape measure to see a difference top to bottom or side to side. If the PTO shaft is in it, I've put tranny in a high gear, engaged the PTO, grabbed a big pipe wrench and used the PTO shaft to turn the tranny a bit. Try pushing the clutch pedal then rotating the engine or tranny back and forth a bit. Either the two halves suddenly go together, or you hear something wrong.

    With only 1/2" to go, The input shaft is already into the clutch splines, the only thing left is the pilot bearing in the flywheel, as has been suggested, and at about 1/4" there are the two small pins on either side of the engine flange.

    Cal Sexsmith    Posted 09-01-2019 at 12:30:32 [URL] [DELETE]        [Reply] [Email]  
  • Re: Putting 8N back together
  • I backed it out to about 1.5" away, the input shaft is now out of the clutch splines. It appears that the problem is that the two halves are twisted. With the holes at the top lined up on one side the back half is a bit high and on the other the back half is a bit low. I wedged the engine to keep it from rotating when I did the split, but it must have tilted a wee bit. I also seem to have a bit of a horizontal alignment problem as well.

    John in Mich    Posted 09-01-2019 at 12:03:09 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Putting 8N back together
  • Good advice, BTDT on several tractors. It works.

    Bruce Dorsi    Posted 09-01-2019 at 07:42:17 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Putting 8N back together
  • It's hard to say without being there in person.

    I am assuming the clutch & pressure plate was removed before replacing the ring gear.

    Was a pilot shaft used to center the clutch disc to the pilot bearing when the pressure plate was bolted back to the flywheel?

    One possibility is that the clutch & trans splines are aligned, but the nose of the trans input shaft is not aligned with the clutch pilot bearing.

    Maybe depressing the clutch pedal will allow things to center themselves.

    As Jack mentioned, the space between the mating parts should give some indication of what needs to be done.

    Cal Sexsmith    Posted 09-01-2019 at 07:50:50 [URL] [DELETE]        [Reply] [Email]  
  • Re: Putting 8N back together
  • I used a homemade pilot shaft to centre the clutch. Measurements indicate that vertical alignment is OK, but horizontal alignment is a bit off. I am going to try backing things off a few inches to see if I can straighten things out. I may try depressing the clutch pedal first to see if that helps.

    Jack - Iowa    Posted 08-31-2019 at 19:36:15 [URL] [DELETE]        [Reply] [Email]  
  • Re: Putting 8N back together
  • Others are much better qualified to answer you than I am. That said, are the two halves level to each other? Perhaps easiest check is to observe your space. Is it equal top to bottom. Must be or it will not slide together. On my 860 I had not pulled the PTO shifter which caused me the opposite problem. Must be level and in line side to side.

    Doug Siperly    Posted 09-01-2019 at 19:01:44 [URL] [DELETE]        [Reply] [Email]  
  • Re: Putting 8N back together
  • Would it be great to see how they put them together on the assm. line? You just know they just slid them together ...1 2 3 and done

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