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  1. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    I did some oil samples on the last semi I bought and was really glad that I did, gives some piece of mind. I don't know for sure, I haven't went and looked at it yet, this was purely testing the waters to see if anyone thought upgrading to a B was well worth it over a known A model. I'm probably...
  2. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    Well that's what I'm not sure about. Was curious if anyone else had upgraded to a B model and if it was worth it in terms of reliability and performance. I'm pretty happy with mine but I do work on it alot, would be nice to have a more original machine with less hours. More time in the seat...
  3. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    Well so far so good. I've got about 12 hours on the machine and haven't lost any fluid so I think we are good. This is a pretty good old loader outside of the issues I've had, the engine doesn't use a drop of oil in 200 hours and it'll spin the tracks on a hard push, it has really good power in...
  4. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    I chucked the shaft up in the lathe, on the splines and spun it around and set the bit on the plate that bolts it on to the coupler and spun it around. It's definitely running true, I only had the slightest variance but that is most likely from the splines being a little worn. There was a...
  5. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    Here's a couple better pictures. The shaft definitely has some wear, don't get me wrong. But it probably looked worse in the previous picture because I hadn't cleaned it off yet. I priced a new shaft from CAT and it's $1300 bucks, plus $450 for the flex coupler. I did go ahead and buy a new flex...
  6. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    I've got the motor out and after closer inspection, I think it was the o-ring that was leaking. It looks to have a flat spot on the o.d. The input seal could have possibly been leaking as well, I don't think I drove it in far enough the first time around, I think it was sitting just on the...
  7. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    Interesting. I will do some checking on that, but I might just try to come up with a new coupler. I'm actually going on vacation to Australia here in a couple months, might have to just bring one back with me. Haha.
  8. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    That's what I was afraid of. The good news is the engine stayed bolted up tight, no problems there. I'm hoping to have the motor out tomorrow afternoon, I'll get some pictures of the coupler and see what's going on in there. Really making me consider getting a new coupler just to be safe.
  9. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    Okay good to know. I think when I changed the seal the last time I forgot to get the o-rings for the coupler, that could very well be where this leak is coming from. And yes it is the same one. I will definitely check that, I assumed they were running true because previously it never leaked from...
  10. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    So I've been thinking about this leak this weekend and I'm trying to figure out how I'm going to know if it's the outer seal only or if the leak originated in the splitter box? Does anyone know how to tell for sure? I assume the outer seal is really just to seal the oil bath bearing where as the...
  11. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    I glanced through the book yesterday to see if there was anything on a breather or vent and didn't find anything, I will look for one again on the machine. But that's a good idea for the sleeve, in case there's any imperfections on the yoke that might cause the original seal to leak.
  12. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    That's how I remembered it going back together but wasn't sure if I missed something. Now I'm trying to decide if I should pull the motor or pull the transmission, in case I have to pull the outer housing to work on anything further in the hydrostat.
  13. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    I was looking in my book this morning and it shows just driving in the outer seal. I was loading my loader on my trailer this morning and it was leaking worse than it had been so I'm going to start tearing into it this afternoon.
  14. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    No, I didn't use the correct tool. I just drove it in flush if I remember correctly. I should have definitely taken more time to do it right. I also did not realize you had to do an engine to pump case alignment, I'm going to look that up in my book, but do you have any tips for that?
  15. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    Good to know, that definitely helps. If I remember correctly there's an o-ring or two on the yoke that seals up to the seal on the transmission, is that what you are referring to by adding a speedy-sleeve or sleeving the yoke itself? I also didn't think to check the breather tube, I guess that...
  16. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    That's what I was thinking too, and why I was less afraid to run it for a little while as is. I still really want to pull it out as soon as I can to figure out what's going on in there but didn't know how urgent I needed to be.
  17. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    I forgot to mention, I had the motor out last winter for a new rear main seal and fixing some leaks. I did change the outer seal on the transmission because I was right there. Up until this point, the transmission never leaked a drop but I was afraid if I didn't go ahead and change it, I'd...
  18. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    Thanks for the replies, I completely agree. I was really curious if anyone else has had a leak in the same spot on their machine and what they ended up doing.
  19. joshbowling45

    How long is too long to run a leaking hydrostat main seal on 953?

    I've got a 76y 953 that has a pretty significant transmission leak. Right now I'm losing about a gallon of fluid in a 10-12 hour period. It's coming out of the weep hole on the bell housing, and leaking out of the bottom of the bell housing. So I'm pretty sure it's the seal where the input shaft...
  20. joshbowling45

    953 Transmission bell housing issue

    Alright guys so I got the motor back in and have been running all year. I re-torqued the bolts after about 40hrs and they were all still tight. I've got a little over 500 hours on it since then. Only issue I have now is I have developed a hydraulic leak between the bell housing and transmission...
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