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Subject: And then I found this...

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Kimberly    Posted 04-19-2019 at 15:50:32 [URL] [DELETE]        [Reply] [Email]  
  • And then I found this...
  • Since I don't want to worry about any metal shavings getting into the pump, I decided to drop the pump and get it out of the way safe and sound. When I took the cover off of the end of the PTO shaft, it was full of oil. So the seal at the end of the shaft is leaking. Is that going to be difficult to replace?

    Second is that when I pulled the PTO shaft, I found scarring in the section that is reduced in diameter. What could have caused that to occur? I hope I am not just digging a deeper and deeper hole here.

    Kimberly    Posted 04-20-2019 at 11:47:42 [URL] [DELETE]        [Reply] [Email]  
  • Found the cause - This looks like a major issue
  • I looked into the differential case through the PTO shaft opening. I saw a round piece of steel looking back at me. I fished it out and my guess is that this is some part of the differential; some shaft? I hadn't noticed any issue with the tractor as far as operating it. However, this can't be left, it needs to be addressed. I am guessing that I will have to remove the wheel, pull the axle, etc. I am not feeling very well now. This is more work than I wanted to do at this point; and more work than I am capable of doing alone.

    Kimberly    Posted 04-20-2019 at 20:37:15 [URL] [DELETE]        [Reply] [Email]  
  • For the metallurgy guys to analyse
  • In case someone was interested in the failure. I am guessing enough of it is still in place to hold the spider gear in place. I have no idea how long this may have been in this condition. What potential problems am I facing? I wonder about part 4320; how would it have stayed in place or did it get grounded up?

    TheOldHokie    Posted 04-20-2019 at 13:41:16 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Found the cause - This looks like a major issue
  • I can't image the tractor would operate properly with one of the arms on the spider missing but who knows. Any chance the differential was replaced and that part was left inside? What is the diameter of the broken piece? If it is the spider the fix probably isn't expensive but it will be some work. There are two sets of used spiders with gears on eBay right now for $65 each.

    TOH

    Kimberly    Posted 04-21-2019 at 12:02:31 [URL] [DELETE]        [Reply] [Email]  
  • Not seeing a lot of metal bits in the oil
  • I cleaned out the differential case and also probed the oil for metal and I am not see any real pieces of metal, shavings from the PTO shaft and some scaring on the differential housing where it hung on the ring gear. Haven't used an inspection camera yet but from the last of bits of metal in the oil, I am thinking that the damage may be minor. Will have to go in and see. I can get a complete differential but wait on that. From what I can see of the ring gear, it looks fine.

    TheOldHokie    Posted 04-21-2019 at 15:55:15 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Not seeing a lot of metal bits in the oil
  • Just more wrenching fun ....

    TOH

    Kimberly    Posted 04-20-2019 at 15:09:59 [URL] [DELETE]        [Reply] [Email]  
  • Re: Found the cause - This looks like a major issue
  • I don't recall any work on the differential after Dad passing. However, I don't have memory of what Dad might have done on the tractor. I do recall that water got into the hydraulic/trans fluid unknown to Dad and he started the tractor one winter with the water frozen. I also know that the hydraulic pump was rebuilt, which means removing the PTO shaft and I would think that someone would have mentioned the scarring on the shaft. I just don't have the memory to answer your question. Is there any way I can learn from observation; jacking up the tractor and spinning the wheel? I also have an inspection camera that you plug into the USB port on a laptop that I can use to see inside.

    The broken part is 7/8" in diameter. It is also hollow with two flat areas on either side. As you can see, it ground against the PTO shaft for a bit.

    TheOldHokie    Posted 04-20-2019 at 13:46:22 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Found the cause - This looks like a major issue
  • Looking at the eBay pictures one of teh sets has that exact same milling pattern so my odds of it being from the spider just went way up.

    TOH

    Kimberly    Posted 04-21-2019 at 11:19:07 [URL] [DELETE]        [Reply] [Email]  
  • Re: Found the cause - This looks like a major issue
  • Is there likely other damage inside of the differential?

    TheOldHokie    Posted 04-21-2019 at 16:00:53 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Found the cause - This looks like a major issue
  • If it working I'd say things are not likely to be too ugly. But anytime something like that goes it puts the surrounding components at risk. Hopefully all you need is a new spider and maybe the gears.

    TOH

    Kimberly    Posted 04-20-2019 at 12:19:10 [URL] [DELETE]        [Reply] [Email]  
  • Re: Found the cause - This looks like a major issue
  • That appears to be from the spider; am I correct? I have to tear the differential down. I am feeling sick here. Question is what could have caused this? What else could I find?

    K.LaRue-VA    Posted 04-20-2019 at 21:35:53 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Found the cause - This looks like a major issue
  • If you ever get one of those big rear tires spinning and have it suddenly find traction it can break all sorts of things. Normal use wouldn't cause that to break but most of these tractors have seen a lot more than normal use. The part may have also been weakened by a flaw. What you are experiencing is the dreaded mission creep that occurs just about any time we start working on anything. When covers come off and parts come out, there is always a good chance of finding other problems. I seldom work on anything that goes exactly as planned. This is the main reason I bought more than one tractor. When one is down for repairs the other is still ready to work.

    Kimberly    Posted 04-20-2019 at 22:10:26 [URL] [DELETE]        [Reply] [Email]  
  • Re: Found the cause - This looks like a major issue
  • Yes, it would be nice to have another tractor. My Brother-In-Law has an 8N; I think it is older than mine. He doesn't currently have a hauling trailer and neither do I. Also, I don't like borrowing equipment; if it breaks, even if not directly my fault, while in my possession, then it is my responsibility to repair it. He is looking to sell it; it is in good condition, new tyres, new fenders, new hood etc. I don't know about the engine but he did do some trans work on it. I can't afford it though; if I had the money I probably would tell him to bring it on over.

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