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hydraulic fittings "O ring face"

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TomMull

TomMull

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I am trying to fit a quick disconnect to the hydraulic line of my new scissor lift so that the hose to to the pump does not lie on the floor when the lift is not in use.


The system uses face o ring type fittings. The image below shows the plug that was used to block off the hose at the pump end for shipping. The other end came attached to the cylinders on the lift via a junction block machined for this same o ring fitting.


When I took the plug to my local hydraulic “expert” he said it was metric and he didn't deal with metric. I was also told that he couldn't simply cut the hose and put the disconnect between the pieces since his fitting would not match metric hose.


I really don't have enough knowledge or information to call around or to order something on line. Here's what I do know.


While the fitting is most likely metric, 14 x 150, it seems very close to 9/16 x18 and the literature also lists “ORS thread”. I'll try and dig up a better thread gauge.



lift fitting 2.jpg



Here is the closes thing I can find. https://www.hydraulicsdirect.com/ORFS-Plug-p/fs2408.htm
parker fitting.jpg

The difference is that on my fitting the o ring is captured by the female part and merely rests on the nub on the end.
Note also that there is no ORS size 9/16 listed.
Seems it shouldn't be all this complicated.
Any ideas will be appreciated.

Tom
 
Inside the port that plug fits into, is there an area that fits snugly on the outside diameter of the O-ring? O-rings have to be constrained in order to carry any pressure. I'm wondering if perhaps the plug is just a cheap blanking plug for shipping (not capable of holding pressure). If not, then I don't think an ORS is going to fit.

But I did find a listing for 9/16-18 in a similar (if not identical) sealing system. They call it FOR-seal or "flat face O-ring seal".
http://www.hfifluidpowerproducts.com/Pages/fitting-identification-guide.html
 
TR3driver said:
Inside the port that plug fits into, is there an area that fits snugly on the outside diameter of the O-ring? O-rings have to be constrained in order to carry any pressure. I'm wondering if perhaps the plug is just a cheap blanking plug for shipping (not capable of holding pressure). If not, then I don't think an ORS is going to fit.

But I did find a listing for 9/16-18 in a similar (if not identical) sealing system. They call it FOR-seal or "flat face O-ring seal".
http://www.hfifluidpowerproducts.com/Pages/fitting-identification-guide.html
Click to expand...

Yes, on the inside there is a recess that captures the o ring. When I installed the hose fitting, I put the o ring inside first. Thanks for the link, I'm beginning to feel a bit optimistic.
Tom
 
Tom, I have hydraulic quick disconnect fittings on a couple of my tractors, they look like an air hose connection but heaver to take the pressure way over 2000 lbs. I wouldn't use a quick connect fitting unless it's made just for hydraulics. PJ
 
Thanks, PJ. I know that if a disconnect failed my life would depend on the safety catch on the lift, not a chance I intend to take. So far have managed OK without a disconnect. Tom
 
Tom if you want to try to connect with a hydraulic guy up here in Canadia - I am coming to the USA in a week and again in December and could ship it nationally.

I could probably broker some of this if I had a bit more info
 
Thanks for the kind offer. PM sent.
Tom
 
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