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  1. CStracker

    AGM Batteries In Equipment

    In my business we have a large fleet of F150s with the AGMs from the factory and we're replacing them very often. Not sure if it stems from poor charging, extreme temperature fluctuations, or parasitic drain. It's not brand related either...the ones from the factory lasted no longer than the...
  2. CStracker

    Any info on a Sumitomo s70

    Mine is a 28UX ser#16411 I think you may have better luck getting your manual than mine. Curious who you used for the seals. I didn’t know what to order at first nor did I understand all the nomenclature but after talking to a rep on the phone at Hercules he led me through it. Their prices are...
  3. CStracker

    Any info on a Sumitomo s70

    I missed the radiator hoses. Attaching them. I had more pictures attached in my original pictures post but it must limit me to four because it cut several.
  4. CStracker

    Any info on a Sumitomo s70

    Not sure what all got loaded. Using a phone to do this in the middle of the woods isn’t easy but when I get back to my computer in a few days I’ll look it over and add any that I missed. There wasn’t a part number on any rad hose being so old.
  5. CStracker

    Any info on a Sumitomo s70

  6. CStracker

    Any info on a Sumitomo s70

    Attaching some pictures. Like I said though being a zero tail swing it’s tight in there. Only one small spot for a battery. Hope those throttle linkages help, but It may not be a stock setup. It’s an old machine. The seat is definitely a home brew.
  7. CStracker

    Jerky

    It's worth a try! I'm not fully understanding quickdraw's issues either...I don't understand if he's saying all the hydraulics are jerky (like mine were) or if it's just the dipper cylinder. If it's just one cylinder doing that i would pull it apart and examine it for seals damage. They may be...
  8. CStracker

    Jerky

    I don't believe in snake oil either. My guess is that it's so much thicker and tackier that it smooths out the fluid movement a little and slows it down. There's no doubt the jerkiness improved on my machine. I thought it was a try for about $30. I had used Lucas years ago on a Nissan...
  9. CStracker

    Jerky

    I added Lucas hydraulic oil stabilizer to my 3 ton IHI and it helped jerkiness a lot. I estimate my ratio of treatment is about 7-8%. The previous owner was running universal tractor/hydraulic fluid in it and after reading about it I decided not to change it out because it was new oil already so...
  10. CStracker

    Any info on a Sumitomo s70

    I can take some pictures but it will be next weekend before I get back to the machine and the Tuesday after Labor Day before I can post them.
  11. CStracker

    Any info on a Sumitomo s70

    Yes if those ever wear out I’m welding it shut and using that cylinder to run a thumb. Don’t really need the offset in the woods but I did find it handy a time or two so I could eat my words as time goes on. Good luck finding the hoses. If you can’t find them premolded just get some universal...
  12. CStracker

    Any info on a Sumitomo s70

    When I saw offset I’ll show you the picture. Yours swings from the base but my base is fixed and the offset happens in the middle section. Useful for certain situations but I would prefer a swing setup. I don’t have any manuals but once you go over the machine with a fine tooth comb you’ll...
  13. CStracker

    Any info on a Sumitomo s70

    I would love to see how you setup a divertor from the swing! I don’t have a swing but an offset type boom which I could divert as well. For now I have a mechanical thumb but it’s a pain to jump off the machine. Would love to go hydraulic thumb because I am going to be carrying a lot of rocks.
  14. CStracker

    Any info on a Sumitomo s70

    I’m attaching copies of the seals order but I can’t remember which goes with which cylinder. Very simple to measure with a set of calipers and if you don’t have a set a cheap HF set will work. You’ll figure out the nomenclature. MCW= metal clad wiper The pressure seals I bought do NOT need a...
  15. CStracker

    Any info on a Sumitomo s70

    It’s easy to measure for those seals. I can post a picture of the seals I purchased from Hercules but there’s no way to know if those are the exact same cylinders. They sure look alike though!
  16. CStracker

    Any info on a Sumitomo s70

    Found some other pictures on the googlie and the engine looks the same, Isuzu 3 cylinder (mine is the 3KC1), the gauge cluster is identical, the light switch is identical. Those along with the same looking cylinders I would say it’s made by IHI. The nameplate on the one I saw on google looks...
  17. CStracker

    Any info on a Sumitomo s70

    Looks like my IHI as far as the booms and hydraulic cylinders and a few controls on the machine. Mine is zero tail so the body’s don’t look similar.
  18. CStracker

    Any ways to slow down jerky movements?

    After some work done with the machine I wanted to follow up on this thread since I started it. First, I replaced the seals in the boom, dipper, and bucket cylinders. Of course this didn’t have any effect except that it stopped one of the tiny leaks and fixed some major pressure seal issues that...
  19. CStracker

    PC75UU-2 (I think) Tracks

    How about the weight of the machine and using that as a reference for identification? Also the engine and HP. But I would use the size of the tracks you have on it as a reference. Those should have some type of numbers on them, or you can take a series of measurements to determine their...
  20. CStracker

    PC75UU-2 (I think) Tracks

    Looking up the weight for the PC50 vs PC75 is ~11k vs ~17k lbs so you may be able to figure out the model based on the weight. You could have a nameplate that has been painted over and may be able to find it and dissolve the paint.
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