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Hydraulic Cylinder Expert needed


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#1 Bmerf OFFLINE  

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Posted December 13, 2014 - 11:11 AM

Well yesterday was the day to visit the local scrap yard to see what goodies could be found.

 

This followed me home:

 

IMG_2250.JPG

 

Looks to be almost new. I have no idea what it was used on as it was already loose and laid off to the side. When I asked about it, the yard guy said I could buy it if I wanted. Thought it might work for a project floating around in my head. When I got home and started messing around with it, I discovered that one end has what appears to be an air bleed.(red circle)  I removed the line and the cap.(green arrow) Thinking that the "fitting" (blue arrow) was removable. It presented more resistance than I thought it should so I stopped trying to turn it. 

 

Cylinder air bleed.png

 

My question is the "fitting" (blue arrow) removable? If not can I just use the mig and weld up the air bleed? Although there is not a lot of money invested (~$8) I don't want to screw this up. Any advice to my next course of action?

 

Thanks,

 

Brian

 



#2 rrmeidl OFFLINE  

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Posted December 13, 2014 - 11:38 AM

I would say no. It appear you have a single acting pull down cylinder.


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#3 olcowhand ONLINE  

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Posted December 13, 2014 - 11:55 AM

Can you get a brighter pic of the other end of things to see the "fluid in" connections?



#4 Bmerf OFFLINE  

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Posted December 13, 2014 - 12:28 PM

Some more pictures, sorry they are blurry camera doesn't like close-ups:  

 

 

IMG_2251.JPG

 

Offending fitting:

 

IMG_2254.JPG IMG_2255.JPG

 

Best one I could get of the inside of the line:

 

IMG_2259.JPG

 

Cylinder has these numbers on it: 4906 7121965.  Google search turned up nothing.



#5 olcowhand ONLINE  

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Posted December 13, 2014 - 12:52 PM

I'd say it is a double action, but I have no idea what the notch is for.  May lead to nowhere, and is simply a notch.

 (waiver...I'm no expert by ANY definition!) LOL


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#6 Freddie1911 OFFLINE  

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Posted December 13, 2014 - 12:56 PM

Best SWAG is probably a special process cylinder. That probably a built in pressure check. Now expert has two meanings #1 a drip under pressure or #2 some SOB from outta town. Like I said that's a SWAG
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#7 Bmerf OFFLINE  

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Posted December 13, 2014 - 01:27 PM

I'd say it is a double action, but I have no idea what the notch is for.  May lead to nowhere, and is simply a notch.

 (waiver...I'm no expert by ANY definition!) LOL

The notch definitely goes to atmosphere.

 

 

Best SWAG is probably a special process cylinder. That probably a built in pressure check. Now expert has two meanings #1 a drip under pressure or #2 some SOB from outta town. Like I said that's a SWAG

I am thinking that this was off a specialized piece of equipment, where gravity, springs or another cylinder pulled this cylinder open(extended), then hydraulic pressure moved this cylinder closed (retracted).

 

I am thinking that when I get the time, I will extend the cylinder (to protect seals) and weld 'er up. What have I got to lose? It was scrap after all. Hopefully it will still function as double acting cylinder, time will tell. 


Edited by Bmerf, December 13, 2014 - 01:28 PM.


#8 Auburn David OFFLINE  

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Posted December 13, 2014 - 02:03 PM

Looks like a trim cylinder to me,I have a couple of these off an old boat and they also have the drain /vent..mine are dual action.


Edited by Auburn, December 14, 2014 - 12:03 PM.

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#9 skyrydr2 OFFLINE  

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Posted December 14, 2014 - 06:10 AM

Did you run it in and out yet? Did you get anything out of that hole? That hole may be a vent for a cushioning function in the end of the barrel.
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#10 Bmerf OFFLINE  

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Posted December 14, 2014 - 11:21 AM

I only moved it in/out by hand. Oil that was in it was very clean, but only had oil in the ram end, other end seemed to be empty. Will try hook air up to it later today and see what happens.



#11 rrmeidl OFFLINE  

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Posted December 17, 2014 - 01:09 PM

The notch definitely goes to atmosphere.

 

 

I am thinking that this was off a specialized piece of equipment, where gravity, springs or another cylinder pulled this cylinder open(extended), then hydraulic pressure moved this cylinder closed (retracted).

 

I am thinking that when I get the time, I will extend the cylinder (to protect seals) and weld 'er up. What have I got to lose? It was scrap after all. Hopefully it will still function as double acting cylinder, time will tell. 

I believe your right about it being what it is. good luck welding it up. It will have to be a good weld to hold pressure though.


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#12 Bmerf OFFLINE  

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Posted December 17, 2014 - 07:47 PM

Did you run it in and out yet? Did you get anything out of that hole? That hole may be a vent for a cushioning function in the end of the barrel.

 

I have not had a chance to get back to the garage yet. You would think that with the garage <100' from the house that I could make a detour, but noooo. Life always has a way of getting in the way.



#13 Bmerf OFFLINE  

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Posted December 18, 2014 - 10:29 PM

Put air to it and it moves in and out just fine. When it gets to the end of the stroke (extended) air blows out the little hole. At this point, I will just clean it and weld it up. Nothing to lose. I will let you know how it turns out. Thanks for the help. 



#14 olcowhand ONLINE  

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Posted December 19, 2014 - 09:01 AM

It may just be vent for a cushioned bottoming piston of some sort, but in any case, welding it up should eliminate any doubt of it working right for you.


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