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hydraulic line question.


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#16 Ryan313 OFFLINE  

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Posted January 27, 2012 - 12:35 PM

Valve 1 says in, out, cyl 1 and cyl 2. Valve 2 says in, out, A and B. By HP hoses how high pressure are you talking? Its a 1000psi system.

#17 Ryan313 OFFLINE  

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Posted January 27, 2012 - 01:13 PM

how about this? Again, red are the large lines, blue are the smaller.

hydraulic system.jpg

#18 olcowhand ONLINE  

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Posted January 27, 2012 - 01:20 PM

how about this? Again, red are the large lines, blue are the smaller.

[ATTACH=CONFIG]28795[/ATTACH]


That is correct!
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#19 Ryan313 OFFLINE  

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Posted January 27, 2012 - 01:23 PM

That is correct!


ok good, that way looks much easier do do then what I had before. Now, back to the hose sizes... can I leave the blue lines smaller or do I need to make them larger?

#20 skyrydr2 ONLINE  

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Posted January 27, 2012 - 01:32 PM

Your plumbing is now correct, as for the hoses , you want a hose with a higher working pressure, to be able to act as a "saftey cushion" per say. A normal single or double wire hose will work great . Don't use any plastic or nylon ,like you see on pickup snowplows, its junk and doesn't hold up.
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#21 Ryan313 OFFLINE  

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Posted January 27, 2012 - 01:40 PM

I just went out side and the measured lines that are on the tractor now, two of them are 5/8 and two of them are 3/4 on the outside diameter. The parts that connect the hoses to the valve or cylinder are all the same size.

#22 skyrydr2 ONLINE  

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Posted January 27, 2012 - 01:50 PM

The hose should have #s on it either fractional or number size ..4 is 1/4" 6 is 3/8 and so on. Don't go by the outside ,its the I'D that matters.
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#23 Ryan313 OFFLINE  

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Posted January 27, 2012 - 02:08 PM

The line with 5/8 on the outside is an 8 and I could not figure out what the lines that were 3/4 were.

#24 skyrydr2 ONLINE  

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Posted January 28, 2012 - 05:13 AM

#8 hose is pretty large for a gt , if it goes from the pump to the valve, ok if it is the feed from the tank to pump. Is this a factory unit ? If not, I would venture to say ,the po may have used what they had on hand....
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#25 Toolpartzman OFFLINE  

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Posted January 28, 2012 - 05:45 AM

Just my 2 1/2 Cents. I'll second the advice the guys are giving about care and attention to mating system pressure with components. What has not been mentioned is that unlike the straight lift system, your new system is more likely to see pressure spikes when the blade strikes a rock etc. I.E. , with the valve closed and the cylinder parked in the desired position, the blade is "pushing back" against the closed plumbing. 2-wire braid will take momentary pressure spikes, just be certain that the hose length is slightly longer (enough to "drape"somewhat). This is because under a spike, the hose can actually shorten. This is the "jump" thats commonly seen in hose lines.

I tested a grapple cylinder off a track-hoe a couple of years ago with a 2500psi relief, cylinders rated at 5000 psi, where the operator was using the closed grapple as a hammer. Spikes were over 8500 psi. The hose held but the piston seals blew, because the I.D. of the those 5000K cylinders "grew"-a measured .060 inch. --So like everyone says, take good care of the plumbing, and nobody gets a bath.
--Lee

Edited by Toolpartzman, January 28, 2012 - 05:56 AM.

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#26 skyrydr2 ONLINE  

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Posted January 28, 2012 - 06:56 AM

Spot on Lee ! That is the "safety cushion" I mentioned about earlier :thumbs:
I wish I had a real keyboard to type all this, I know my replys are short and pointy , my fingers are to fat for my phone key pad LOL.:mecry: :sleep:
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#27 Toolpartzman OFFLINE  

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Posted January 28, 2012 - 08:06 AM

Just a FYI follow-up to my earlier post. If you're tearing down a cylinder and discover numerous-not just (3-4) pieces of o ring or u-cup seal, thats an indication of repeated, very-high pressure spikes. In the few milliseconds the spike occurs-as in my example, the barrel "hoops"-enlarges- and a portion of the seal is forced out of its groove. When the spike relaxes, so does the can, closing down on the extruded seal, and "chews" away chunks of the seal now trapped out of its groove. The actual spike pressure in my test was more likely far greater than 10K PSI, but by gently ramping up test pressure to where a micrometer mtd to the can moved the .060 at only 8500, I was able to prove to the customer the cause of failure.----Hope this explains a little better-
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#28 Ryan313 OFFLINE  

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Posted January 28, 2012 - 10:20 AM

Thanks for the info! I know my dad replaced at least 1 line a few years ago when it was restored. The I know he replaced one of the hoses that went from the valve to the cylinder. I don't know if he got the same size that was on it or if he got a different size.

#29 mikebramel OFFLINE  

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Posted February 01, 2012 - 09:11 PM

Nothing to worry about as long as each cylinder has the same size pairs




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