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  1. #31
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    Ok, moving on from the pump - I’ll need to strip the old (used) cylinder and re-seal it as well as check it’s not nasty inside.

    I’m assuming the end cap just screws on, and it’s just a case of unscrewing it?
    I’ll need to make up a pin spanner to fit, so how much fight should I expect to get it moving - ie should I make the pin spanner solid enough to survive a hammering?




    Steve

  2. #32
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    Knocked up a quick spanner out of some flat and a couple of cap screws. Couple of light hits with the hammer got it moving.




    Unfortunately it looks like I copped the only water damaged cylinder in the pile







    Bugger...

    Steve

  3. #33
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    Apr 2012
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    Healesville
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    Clean it up and give it a hone and it might be ok, if it holds air pressure it should be ok, failing that you might get the right size tube here
    https://www.voestalpine.com/highperformancemetals/australia/en/home/products-brands/products/tube/


    How much of the cyl is undamaged, if you cut the rusted end off will the stroke be long enough with using the undamaged end?
    Last edited by shedhappens; 24th Sep 2020 at 10:53 PM. Reason: more

  4. #34
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    Default Workshop press build - hydraulic questions

    Any suggestions on an alternative method to hone it - or is it just a case of buying a cylinder hone to suit?

    Cutting it down is a possibility. Probably leave approx 200-250mm stroke.
    Unfortunately the ram was extended a fair way when it was stored so about half the cylinder is rusted.

    Steve

  5. #35
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    Quote Originally Posted by OxxAndBert View Post
    Any suggestions on an alternative method to hone it - or is it just a case of buying a cylinder hone to suit?
    Steve
    Steve you will have to clean it and have a look to know what way to go, you might get away with cross hatching it
    with 400 wet n' dry?
    I have had to repair cylinders that were pretty rusted and needed replacing but the tight wad owners didn't want to cough up so they got a clean up and new seals and out they went, and they worked but how well I dont know, how many strokes a day would a cylinder do on a back hoe?

  6. #36
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    Thanks Shed.
    I just had a poke around on eBay and found a cheap 2-7”, 3 leg hone for $24 delivered so I’ve ordered one of those. It’s a pretty useful size range to have around anyway, apart from this particular job.

    I’ll give it a good clean and go from there.

    Steve

  7. #37
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    Sep 2012
    Location
    York, North Yorkshire UK
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    Hi Steve, Guys,

    Depending upon the diameter of the cylinder, a wire wheel on a long length of rod in an electric drill would probably remove most of that crap and reduce the wear on your hone. I have one of those bore hones and the stones don't last very long at all, particularly if the surface is a bit rough.
    Best Regards:
    Baron J.

  8. #38
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    Thanks - great idea.

    Steve

  9. #39
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    Melbourne
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    I would buy a cheap cylinder hone and have a go.

    You would be amazed at how much damage an hydraulic cylinder can have and still hold pressure.

    I know this because my hydraulic press (which I built) used a very badly worn ram (you could see the wear without measurement) but I replaced the seals and when I tested it, I still managed pressures of 3000 psi. Maybe different in an excavator or other machine that is being used all day and every day but for a press, so far 15 years on and its still good.

    Also my hydraulic log splitter that I build used a ram that had rust and small amount of pitting. I honed it with a typical engine cylinder hone until I achieved a visible crossed hatching pattern. The pitting was still visible unfortunately. However, to my surprise, it too holds pressure to 2200 psi (pressure relief valve pressure) and would probably hold pressure easily to 3000 psi as well.

    Just my experience.

    Simon

    Sent from my SM-G970F using Tapatalk
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  10. #40
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    Steve have you thought about how you are going secure the cylínder?
    If the cyl bore comes up passable then it would be an advantage to make a larger dia ród for it.
    Mine is 4.5", presses like a chunky rod. Have a look at the end cap and assess if it can be bored out.
    I am mentioning this as it would get quite dangerous if you had the rod out a distance with a few ton on it and it decided to go sídeways

  11. #41
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    Shed,

    Thats a good point and always been in the back of my mind too.

    Another option, not as elegant as a chucky ram but i intend (as an upgrade) add supporting stays that project out each side from the bottom of the ram to engage as a sliding track attached the the vertical supports. That removes a degree of freedom for the ram. It will also reduce greatly the ability for the ram to bend front or back.

    Simon

    Sent from my SM-G970F using Tapatalk
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  12. #42
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    Good point about the possibility of ram deflection.
    I’m sure I could make a larger ram. I’ve got some 2-1/2” rod here and know where I can get some used larger diameter if need be.

    My thoughts for mounting this particular cylinder were to make a frame to take the eye of the cylinder, and just restrain the gland end using a close fitting collar.

    Steve

  13. #43
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    Quote Originally Posted by simonl View Post
    Shed,

    Thats a good point and always been in the back of my mind too.

    Another option, not as elegant as a chucky ram but i intend (as an upgrade) add supporting stays that project out each side from the bottom of the ram to engage as a sliding track attached the the vertical supports. That removes a degree of freedom for the ram. It will also reduce greatly the ability for the ram to bend front or back.

    Simon

    Sent from my SM-G970F using Tapatalk
    A good idea to do something simon, but a man of your talents would be able to fit a larger dia rod so as not to reduce the
    ergonomics of the press.

  14. #44
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    Quote Originally Posted by OxxAndBert View Post
    Good point about the possibility of ram deflection.
    I’m sure I could make a larger ram. I’ve got some 2-1/2” rod here and know where I can get some used larger diameter if need be.

    My thoughts for mounting this particular cylinder were to make a frame to take the eye of the cylinder, and just restrain the gland end using a close fitting collar.

    Steve
    I have straightened a few hyd cyl rods over the years, it might be surprising how easy they are to bend. Straightening them
    can be time consuming checking and pushing them this way and that way but they bend easily.

  15. #45
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    Good idea to use the wire wheel to clean up the worst of it.

    Bit of allthread and I had a new cup brush in the cupboard




    Almost looks like it’s corroded off a layer - similar to what happens when you have an area of scale chipped off some hot rolled bar.
    Hard to get a photo but I tried




    Steve

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