Problems connecting flat-face connectors

[Browneyesvictim]

There are a lot of different styles of quick couplers for different applications. They all suffer from the same symptom you describe getting them re-attached when fluid pressure is trapped on one side or the other of the fittings. There is one specific type that is "supposed" to be able to overcome this that is designed to be coupled/un-coupled under pressure. WP77196 High Pressure Coupler Set - Grainger Industrial Supply
This type has a threaded collar (versus the pull-type) on the female side that you can use to thread on the male end forcing the internal ball checks to unseat. In my experience with these type of couplers it is still difficult if there is A LOT of pressure there. But for a few hundred psi of residual pressure should work perfect. Just make sure that the threaded collar is seated completely on to the male end to ensure they are connected fully and properly! (Don't ask me how I know)

 

[eddie48]

You put the barrel in the palm of your hand and use thumb and fingers to hold the dowel and then tap the dowel.

Note to self: Hold the sides of the dowel, not the end. Doesn't hurt as much

Actually, it is going to take more than a tap, but I will try as you suggest. Just didn't think I could hit it hard enough while holding everything. Thanks

 

[J_J]

Most flat faced couplers are supposed to connect under pressure.

Parker Snap-tite

74 Series
Flush Face, Dry Break, ISO 16028 Interchange, Hydraulic Quick Connect/Disconnect Hose Couplings
ISO 16028 Interchange Connect under Pressure Capability available in 1/2" size 3/8" also meets HTMA specifications Push-to-connect design Available in Sizes 1/4" thru 1" Working Pressures to 4,568 psi (315 bar) Steel Construction Optional Safety Sleevelock

 

[Browneyesvictim]

"Supposed to" is right... maybe with enough lead in my shorts to push that hard against the pressure. That's the beauty of the threaded collar type... you get the mechanical advantage. You can even use a tool to get more if you need it. But hey... the tapping on it thing works too but is also messy and not really that safe

 

[jenkinsph]

When my connectors won't fit up I double up a thick rag over them and tap them with a ball pein hammer. The rag reduces the fluid danger, the oil mess and cushions the hammer blow. So far in nine years it hasn't deformed the flat face connectors either.

 

[GPintheMitten]

I don't know whether my quick connectors are flat or not. Please see picture.

I can't get them connected. Blast it!

This is on a Kubota B2620 and Kubota BH6500 backhoe. I got the tractor quick connects from Kubota to plumb a used BH6500. There should just be air in the tractor side, and fluid on the backhoe side. I've wiggled all the levers on the backhoe.

They sure look like matching hardware.



Here's a pic showing them after I attempted to connect.

 

[aczlan]

Put a rag over the male end, then push it against the ROPS, does the piece sticking out on the end go in?
Put a dowel into the female side and see if you can push in the matching center piece on that one.

Aaron Z

 

[GPintheMitten]

Thanks Aaron. I did something similar and got them connected. I just came back to the house to post success. Yay.

 

[J_J]

Flat face QD don't have any protrusions, so you have to push in or tap the dowel on the Male QD center.

A rounded bolt head or a rivet head will also work.

Last resort is to cover the QD with a rag and loosen the QD from the hose.

 

[lostcreekranch]

Looks like a good solution. Anyone bought one of these?

http://www.farmshow.com/a_download_page.php?aid=MTg2NTk=

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