sealing hyd lines

[gmbracing]

how do you get a good seal between the hose end and the qd plug. I just can't get one to stop leaking help any tricks?

 

[kennyd]

The correct answer will depend on what kind of fitting it is, NPT, JIC, ORB...can you post a picture?

 

[RickB]

how do you get a good seal between the hose end and the qd plug. I just can't get one to stop leaking help any tricks?

Tapered pipe threads require sealant. My choice is and will be teflon tape. It needs to be applied properly to be safe and effective. It is not for those who don't understand how to apply it, or how to remove it from a disassembled connection where it has been used. Oring boss, face seal, and flare style fittings such as JIC and others require no sealant.

There will be posts here for a week debating the use of teflon tape. I will not be participating.

 

[kennyd]

There will be posts here for a week debating the use of teflon tape. I will not be participating.

OK, I won't Either:laughing::laughing::laughing::laughing:

BUT, a PTFE paste is also good for and recommended for hydraulics, and you can't get it at Home Cheapot.

 

[Gary Sweat]

I used Vibra-TITE and to date not one NPT fitting is leaking. Basically a high pressure type of lock tite. Sets up fairly quickly too.

 

[AKKAMAAN]

Here is a link from a thread a while ago

..........
>only use it on tapered threads

>don't cover the front/top of the threads

>Teflon need to be properly stretched

>wind the Teflon tape on, by turning the male threads the way you screw it into the female....make sense??

....discussion about teflon tapes "be or not to be", will always upset a lot of minds and will continue be "never ending story"....great product if used with care and common sense..

 

[gmbracing]

thanks for the replies, I will research how to apply the tape and clean the connection before trying again

 

[J_J]

You should also be aware of the purpose of the tapered thread. It was not designed to be used many many times. Things like over tightening and galled threads, may never get a leak free connection. You may have to get a new tapered thread end on the hose, and or a new QD.

 

[wdchyd]

You should also be aware of the purpose of the tapered thread. It was not designed to be used many many times. Things like over tightening and galled threads, may never get a leak free connection. You may have to get a new tapered thread end on the hose, and or a new QD.

x 2.........:thumbsup:.....

 

[whistlepig]

We use Loctite PST 592 for industrial applications. For fittings that move 80,000 pounds plus. Loctite PST was designed to still seal a fitting if an assembler just hand tightened and forgot to tighten it with a wrench. A hydraulic leak from this kind of pressure will cut human limbs off.

 

[whistlepig]

Darn! Forgot the link.Loctite PST Thread Sealant 592

 

[J_J]

Just curious about the residual sealant when you have to break the fittings apart. Especially the inside threads.

 

[wdchyd]

Just curious about the residual sealant when you have to break the fittings apart. Especially the inside threads.

It just turns dry inside the threads (anerobic-lack of air hardens it up).....doesn't cure as hard as regular loctite......can be scratched and blown out ......


Oh Yea....BTW........HAPPY NEW YEAR....!!.......:drink::drink::drink::drink:

 

[/pine]

It just turns dry inside the threads (anerobic-lack of air hardens it up).....doesn't cure as hard as regular loctite......can be scratched and blown out...

not starting anything but this shows that any type of sealant can contaminate a hydraulic system...tape does not have the market cornered on causing posssible system failures...

prudent use of tape (holding back from last thread) is about the same as using paste type sealants/lubricants...

My assumption is...most contaminations of user addressed systems by sealant debris occur when original connector fittings are reworked etc...

...it can be difficult to remove debris from ports on valves that can not be inverted to keep fragments from dropping into the valve bodies...

JMO but if I got the chance...I would vote for all ORB ports on everything like valves, cylinders, pumps etc....and all flare (JIC) on hoses/tubes , QD's etc...

 

[wdchyd]

not starting anything but this shows that any type of sealant can contaminate a hydraulic system...tape does not have the market cornered on causing posssible system failures...

prudent use of tape (holding back from last thread) is about the same as using paste type sealants/lubricants...

My assumption is...most contaminations of user addressed systems by sealant debris occur when original connector fittings are reworked etc...

...it can be difficult to remove debris from ports on valves that can not be inverted to keep fragments from dropping into the valve bodies...

JMO but if I got the chance...I would vote for all ORB ports on everything like valves, cylinders, pumps etc....and all flare (JIC) on hoses/tubes , QD's etc...

Yes, anything can contaminate hyd oil.....but the "Stringyness of the Teflon Tape" is much more trouble....It doesn't churn up well in the mix....

ORB..JIC..:thumbsup:

 

[gmbracing]

well, got to work on the leak and found out it's not my connection but the crimp on the hose itself. Guess the dealer is getting acall tomorrow. It's brand new hose

 

[wdchyd]

Make sure he replaces the hose rather than recrimping..!!

 

[Wayne_H]

This is what my local shop says to use. I've used it a lot with no problems. It won't gum up the system either. Very easy to use, but a bit pricey. Loctite 545.

Loctite 32429 Hydraulic / Pneumatic Thread Sealant, Pack of 2

Wayne

 

[gmbracing]

well the dealer made good on the hoses, Made me 2 new hoses and installed them on the cylinder,. all i had to do was pin it back on

 

[wdchyd]

:thumbsup:......