HYM cylinder....

[mrcaptainbob]

Okay. Another info request. I found the tag on the cylinder. HYM-N2R-4X18,
1E7405-595-2B. So, I know it's an 18" stroke and 4" i.d. How can I find what pressure it's rated for? I have no idea the brand.

 

[J_J]

Most of the newer cyl are around 2500 to 3500 psi. If it is a real old cyl, might be less or , might be worn out. Hook it up and test it, starting around 1500 psi on the relief.

If you are going to use the new two stage pump, it has a working pressure of 2500 psi in the low speed/high pressure.

 

[mrcaptainbob]

Hi, J_J. This cylinder is old. No idea on how old, but it came from the same splitter that the Vickers pump (other threads) (http://www.tractorbynet.com/forums/hydraulics/156850-vickers-pump-2.html) came from. It is a bolt type cylinder, 5/8 bolts, I believe.
Thanks again for all your help, J_J.

 

[mrcaptainbob]

How can I find what this cylinder is rated at? I'd hate to test it at 3k and have it come apart!

 

[J_J]

If you can find manufactures name, model number, etc, they can perhaps identify the cyl. Test pressure on just about anything hyd, is much higher than operating pressure.

About the only way to test a cyl is to test the cylinder, but in doing so, may cause it to fail. I believe that the test could be ran by using only so much pressure, and increase the pressure until it gets to the pressure that you would desire, and hold that pressure for a set time. Note the pressure that it starts leaking if it is a slow leak. If the test destroys the seals, then it will have to be rebuilt, and it would be up to you to decide if it is worth it. I believe hyd testing is about $45 to $60 per hour.

If your pump is capable of 3000 psi, you could set the relief much lower and operate the cyl for a while, and if if it works good, and no leaks, bump up the pressure until it is operating within the range of most cyl of 2500 to 3000 psi. If it fails, it is probably not going to explode, just blow the seals for an external leak, or doing some seriously internal bypassing.

 

[glastron23]

If you can find manufactures name, model number, etc, they can perhaps identify the cyl. Test pressure on just about anything hyd, is much higher than operating pressure.

About the only way to test a cyl is to test the cylinder, but in doing so, may cause it to fail. I believe that the test could be ran by using only so much pressure, and increase the pressure until it gets to the pressure that you would desire, and hold that pressure for a set time. Note the pressure that it starts leaking if it is a slow leak. If the test destroys the seals, then it will have to be rebuilt, and it would be up to you to decide if it is worth it. I believe hyd testing is about $45 to $60 per hour.

If your pump is capable of 3000 psi, you could set the relief much lower and operate the cyl for a while, and if if it works good, and no leaks, bump up the pressure until it is operating within the range of most cyl of 2500 to 3000 psi. If it fails, it is probably not going to explode, just blow the seals for an external leak, or doing some seriously internal bypassing.

Now i know that you have lost it JJ.... are you nuts asking some one who has limited knowledge of hydraulics to PRESSURE TEST a cylinder until it FAILS.... sh#t i won't test a cylinder until failure and i have the test equipment to do it... what if the cylinder has a SAFETY factor of 2.5 and you test it to 3... what happens... most likely nothing, BUT if the cylinder is old and on the edge of failure then you have a BIG problem on your hands (lets hope your hands are not close to it when sh*t happens) PLEASE either take the cylinder to a PROFESSIONAL hydraulic shop to see just what you have .. if you building a splitter these cylinders are cheap and at least then you KNOW just what type of hydraulic BOMB is mounted just inches away from your family jewels>>>>> please take it to someone how KNOWS their stuff ...Jim just some light reading http://www.prohipp.com/archivos/DBC article v0.pdf

 

[J_J]

glastron23

Apparently you jumped to some big conclusions about what I said. I do believe what I said was that if you want to test it yourself, to reduce the relief valve pressure, and use the cyl, as in log splitting. If it works OK, increase the relief setting again, and so forth. I have not told anyone to sit on the cyl and crank up the pressure and ride.

Do you happen to test any cyl you use. I doubt it.

And no, I would not want anyone hurt by using common sense and logic.

And on a log splitter, it only gets up to relief pressure very little. Put a gage on it and see for yourself. In the fast mode, a two stage log splitter pump is only working at about 650 psi, and if it needs more pressure, the pump will shift into slow speed/high pressure of about 2500 psi.

A lot of people run log splitters that know little about the hyd system. If it works, it works.

 

[glastron23]

JJ i do understand what you said, yes MOST cylinders today are 2500/3000 psi units but what if he has a old unit from a piece of farm equipment thats rated for 1500 psi, i've been around long enough to see some of these, then what. sure splitters only run 650 psi MOST of the time but if he's into knotty,big tough wood then what??? the old "it's not splitting/ LETS TURN UP THE PRESSURE" comes into effect, now that dual stage pump is running at 3000 psi or more , then what.... is that 1500 psi cylinder going to hold up???? yes for a while .. then ... for goodness sake please find out just WHAT type of cylinder you have there BEFORE you pressurize it,
JJ yes i do test cylinders i rebuild /replace as it's required by CSA and ANSI before i can put the machine back in service.. the test bench we use can go as high as 10,000 psi, want to test a 1500 psi unit??? we NEVER test a cylinder unless we KNOW just what we have, if we can't identify it then we will not test it, we will do a static seal test and then it's the owners. Yes if you have the unit apart you can get close by seeing how it's built, but if someone's modified it then what..
Please take it to a shop, most good shop will tell you what you have ...Jim

 

[AKKAMAAN]

I agree with Glastron 100%

You can not test a cylinder to determine its pressure rating.

Today pressure rating are set by design, and then produktion samples are tested for the rated pressure by 4 or what ever safety factor is used. Procedure is for this should be stated in legal manufacturing code.

This test is like checking if a match is working, or if the dynamite would explode if ignited.....

With a old piece like this, you have to go back and find official rating and after that also having the cylinder tested/checked for wear, craks, damages and leaks......

Of course we all by pass these procedures many times....but we are also personally accountable for our actions.....

 

[J_J]

Once again, the word test could mean a number of things. I believe mrcaptainbob has some knowledge in hydraulics, and if he connects up the cyl and lowers the relief pressure. That is his choice. Now, if the cylinder splits logs at 1500 psi, that in itself is a test. You guys are looking at things as though this is a proof test, using a factor of 1.5 or 2.

mrcaptainbob,

Take what the other guys are saying into account, but please don't apply 4000 psi to that cylinder, not that the log splitter pump could supply that pressure anyway. If you want to use that cyl, use whatever data you have. If you want new, then get new.

To the others.

So nobody will test a hyd cyl? I find that hard to believe. So what do you do, take it in and tell the hydraulic shop to rebuild it anyway, or rebuild it your self, whether it needs it or not.