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  1. greg9504

    Straightening a hydraulic cylinder rod (JCB 212s, backhoe bucket cylinder)

    OK so everything is back together now. All 3 cylinders were 40mmx70mm and used the same seal kit. The kit had an extra o-ring that I couldn't figure out where it went, so I just figured it was a generic kit and that I could ignore the extra piece... until I was assembling the last cylinder...
  2. greg9504

    Straightening a hydraulic cylinder rod (JCB 212s, backhoe bucket cylinder)

    Latest update, 2 broken end mills and one broken center punch later, and the broken bit of pin has been drilled out. The cylinder is back together. However it's another case of one step forward, two backward. More on that later...
  3. greg9504

    Straightening a hydraulic cylinder rod (JCB 212s, backhoe bucket cylinder)

    OK some success. I did the other side front curl cylinder, and besides a stuck rod pin (not the small piston pin) everything went well. The piston pin came right out. Today I did the rear bucket curl cylinder, the one that was bent. I managed to straighten it a fair bit, it's not perfect. I...
  4. greg9504

    Straightening a hydraulic cylinder rod (JCB 212s, backhoe bucket cylinder)

    One step forward, two backwards. So the pin was stuck because the piston was tightened tight up against it: So I put my big pipe wrench on with a cheater bar to back it off (I had tried a 3/4" breaker bar). And as the piston/nut broke loose the pin ejected from the hole. It literally...
  5. greg9504

    Straightening a hydraulic cylinder rod (JCB 212s, backhoe bucket cylinder)

    I believe the nut/piston are one piece?? I'll have to go take another look. Parts schematic below (for the rear bucket curl cylinder, but the front is similar, they use the same seal kit). Part 8 is the "piston head", there's no separate nut. And yes those marks are from me, using imperial 12...
  6. greg9504

    Straightening a hydraulic cylinder rod (JCB 212s, backhoe bucket cylinder)

    Thanks everyone. I started to do the front bucket seals as both tilt cylinders were leaking. Haven't made it past the first one yet. The dreaded JCB piston pin... first was not realizing there was one... at least I was too weak to shear it. Then, I was waiting to get time to go to the...
  7. greg9504

    Straightening a hydraulic cylinder rod (JCB 212s, backhoe bucket cylinder)

    The relief valve for the thumb is set so the bucket overpowers the thumb. The thumb has been on the machine for around 9 years now. But I guess it could have contributed. I may eventually go that route but I figured I should at least try. In 2019 I had the stabilizer rods (also 40mm) remade...
  8. greg9504

    Straightening a hydraulic cylinder rod (JCB 212s, backhoe bucket cylinder)

    Hello, I've got a 2004 JCB 212s (mid size backhoe, about 12.5k lbs). I noticed the bucket dropping when parked, it's leaking. Looking closer it looks like the rod is also bent. What are the chances of bending it back? Not sure how I bent it, but I guess that doesn't really matter... I have...
  9. greg9504

    Leaking Tilt Cylinder

    Hey thanks! For some reason I didn't get your reply either. I did find a kit number: 652653 The tilt cylinders are 4" bore, 1.75" rod. The kit worked for only ONE of my cylinders, the other was different inside and I did the same thing as you and went to a local hydraulics place to get seals...
  10. greg9504

    JCB 506 steering

    Here's another thread for a 505 specifically about the proximity sensors https://www.heavyequipmentforums.com/threads/jcb-505-22-loadall-4-wheel-steering-wont-sync.41639/
  11. greg9504

    JCB 506 steering

    See this thread about a 4 wheel steer JCB backhoe, perhaps they share a similar design, his was a proximity sensor https://www.heavyequipmentforums.com/threads/jcb-214s.92447/
  12. greg9504

    Leaking Tilt Cylinder

    Hello sagepf, I have the same machine. I need to rebuild the tilt cylinders. Just wondering if you ordered a kit for the seals? What was the part number? Thanks!
  13. greg9504

    Premature Seal Failure - What to look for?

    Thanks Tinkerer, I think I have a copy of that same us military manual. I need to remember to reference it.
  14. greg9504

    Premature Seal Failure - What to look for?

    Thanks for the ideas. Nice to finally understand why that top line was there. Again going by memory the top seems to leak more after running for a while, so that might point to too full of a tank. I may have filled to the fill level when cold thinking more oil is better :( I did have the...
  15. greg9504

    Premature Seal Failure - What to look for?

    It has two lines, one at the top and one at the bottom. I seem to remember when I took it out and flushed the system that the top line seem to just lead back to the tank. Which seemed to confuse me. I'll have to double check that. Here's a picture showing the top line took before the first...
  16. greg9504

    Premature Seal Failure - What to look for?

    Hi John, Thanks. I guess I'll have to get a micrometer. With or without a load it drifts down over time at what seems the same rate, but I haven't timed it. It takes a while, again haven't measured, but it's not at the point where it isn't usable. I just can't leave something raised for an...
  17. greg9504

    Premature Seal Failure - What to look for?

    Hello, In the spring of 2019 I paid to have the main mast cylinder for my 1984 Hyster H150F rebuilt. As part of the rebuilding they rechromed the rod (expensive). When that work was done I drained and flushed the system, and thoroughly cleaned the tank. The machine gets sporadic use. I'd say...
  18. greg9504

    JCB Backhoe parts manual

    Too bad the UK site no longer lets you look up parts. What you want is called "JCB Service Parts Pro". It's the software dealers use to look up parts. I have an older copy that I downloaded from the internet. I've found 2017 versions for sale (ali express etc) but it's not cheap ($75), and...
  19. greg9504

    Titan weld on thumb install.

    Thanks Tinkerer, he's going on 13 years soon. Looks a lot better than the old one. Hope it works out.
  20. greg9504

    Titan weld on thumb install.

    Sorry to hear about your thumb troubles. It does look a little on the weak side (your old one). FWIW here's a few photos to show how mine is constructed. The sides are 3/4" AR400 plate. The bigger cross tube is ~2.5" outer diameter, the smaller one (at tip of thumb) is ~ 2" outer diameter...
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