leaking NPTF quick connects

myyaz33 · Feb 7, 2011

Bought the following adapters and quick disconnects (6 total) and am having a **** of a time keeping them from leaking. I started off without any sort of sealant or lubricant and didn't over tighten but they leaked. Then I tried tightening more with less leakage. Tried both PTFE paste and Teflon (against advice, I know). Nothing seems to work. I am now wondering if the threads are toast. Any ideas or tips. Not really interested in a war of tape or no tape.

http://www.discounthydraulichose.com/product_p/5501.htm
http://www.discounthydraulichose.com/ISO_7241_Series_A_Quick_Disconnect_Coupler_p/601-xx.htm

whistlepig · Feb 7, 2011

We use this for industrial applications. I use it at home. Nothing close to it.Loctite ｮ 567? - Henkel

Chilly807 · Feb 7, 2011

It's possible they sent you ORB female ends on the quick connects instead of NPTF. If so they'll keep leaking. I think they're the same thread-per-inch count.

Mine don't leak a drop, and they're sealed with you-know-what.

Sean

myyaz33 · Feb 7, 2011

whistlepig said:
We use this for industrial applications. I use it at home. Nothing close to it.Loctite ｮ 567? - Henkel

Does this stuff need to cure?

Chilly807 said:
It's possible they sent you ORB female ends on the quick connects instead of NPTF. If so they'll keep leaking. I think they're the same thread-per-inch count.

Mine don't leak a drop, and they're sealed with you-know-what.

Sean

Possibly, but I wouldn't know the difference.

I am thinking about just doping them up good and cranking the **** out of them and if it don't work, buying some more adapters and quick connects and starting again. If I could, I would rather not use the NPTF couplers, but that is all I can find.

kennyd · Feb 8, 2011

myyaz33 said:
I am thinking about just doping them up good and cranking the **** out of them and if it don't work, buying some more adapters and quick connects and starting again. If I could, I would rather not use the NPTF couplers, but that is all I can find.

That is exactly what I would do. If you use PTFE past, then also give it some cure time...

oldnslo · Feb 8, 2011

Chilly807 said:
It's possible they sent you ORB female ends on the quick connects instead of NPTF. If so they'll keep leaking. I think they're the same thread-per-inch count.

Sean

The unfortunate reality is that:
1/2" NPT and #10 SAE ORB are the exact same thread per inch & the Out side dimensions are similar enough they will some what interchange.

3/4" NPT and #12 SAE ORB have the same condition.

You can some times tell the difference on female ends since the SAE ORB port will have chamfer or lead in angle of 12 - 15 degrees. Pipe threads some times have an angle but it is usually closer to 30 degrees.

Yes Loctite has a cure time and prefers clean dry threads for assembly. Oil on the threads tends to reduce its effectiveness.

Roy

J_J · Feb 8, 2011

You probably have deformed the threads too much, and about the only fix is to replace both the fittings, and start over with new fittings, and a sealer.

Discount Hydraulic Hose · Feb 8, 2011

We do not stock the 600 Series Couplers (ISO 7241-1 Series A) with SAE/ORB thread, so it's very unlikely that you have the wrong thread. You can eliminate that possibility right there.

I'm sorry to say that JJ may be right. You may have worn out the threads by now. Replacing the couplers, the elbows or both may be your only option at this point. Without seeing the fittings myself, I can't really guess why you are having this problem.

Give us a call if we can be of further assistance.

myyaz33 · Feb 8, 2011

J_J said:
You probably have deformed the threads too much, and about the only fix is to replace both the fittings, and start over with new fittings, and a sealer.

I think you are probably right.

Hydraulic Hose Guy said:
We do not stock the 600 Series Couplers (ISO 7241-1 Series A) with SAE/ORB thread, so it's very unlikely that you have the wrong thread. You can eliminate that possibility right there.

I'm sorry to say that JJ may be right. You may have worn out the threads by now. Replacing the couplers, the elbows or both may be your only option at this point. Without seeing the fittings myself, I can't really guess why you are having this problem.

Give us a call if we can be of further assistance.

Agreed on them being warn out. Any thoughts on how many turns those 2 fittings together should have or how many threads should be showing when properly tightened?

Kitz · Feb 8, 2011

If its orb the 45 should screw in preety much all the way in easily. If they are right for each other they will screw in just a few threads. Teflon pipe dope is all you need. No cure time needed. Make it tight. No leaks

myyaz33 · Feb 8, 2011

Kitz said:
If its orb the 45 should screw in preety much all the way in easily. If they are right for each other they will screw in just a few threads. Teflon pipe dope is all you need. No cure time needed. Make it tight. No leaks

As HHG stated they don't stock those fittings with the ORB thread and I did buy them from them so I agree that the ORB threads are ruled out.

HHG- Wanna take those 2 fittings into your lab and give me a idea of how many cranks I should be giving them?

J_J · Feb 8, 2011

I don't believe there are any set numbers of turns. Just turn it snug with sealer, and check for leaks. If it leaks, tighten a little more.

kennyd · Feb 8, 2011

If the threads are "worn out", then you have nothing to loose trying what you suggested in post #4.

myyaz33 · Feb 8, 2011

kennyd said:
If the threads are "worn out", then you have nothing to loose trying what you suggested in post #4.

That will be the plan, well when it warms up a few degrees..

Mace Canute · Feb 8, 2011

J_J said:
I don't believe there are any set numbers of turns. Just turn it snug with sealer, and check for leaks. If it leaks, tighten a little more.

That's the way I always do it...but there is a "recommended" number of turns to tighten pipe thread. Have a look-see here. pipe threads

Kitz · Feb 9, 2011

Id say you must have cross threaded them. It would be have to be screwed on many many times to be worn out in normal circumstances. Buy new ones and have someone that knows what there doing assemble them for you.

Milton Burro · Feb 9, 2011

I guess I gotta ask, Are you sure it's the threads leaking? I received some bad QC's on my grapple that leaked and were replaced by the seller because they had gotten a bad batch from the manufacturer.

EddieWalker · Feb 9, 2011

How often do you actually use the quick disconnects? If it's daily, they might be worth the effort. I put them on my tractor for my grapple and fond that they are such a pain to deal with that it's not worth having them. I took mine off nad just put regular fittings on there to tighten and untighten with a pair of wrenches. If I have the bucket on, I just screw on a cap to keep the ends clean. It's made life so much easier for me just doing it this way.

Good luck,
Eddie

myyaz33 · Feb 9, 2011

Kitz said:
Id say you must have cross threaded them. It would be have to be screwed on many many times to be worn out in normal circumstances. Buy new ones and have someone that knows what there doing assemble them for you.

Positive they are not cross threaded. I am also confident that I have the skill needed to accomplish this without going to someone "that knows what there doing".

myyaz33 · Feb 9, 2011

Milton Burro said:
I guess I gotta ask, Are you sure it's the threads leaking? I received some bad QC's on my grapple that leaked and were replaced by the seller because they had gotten a bad batch from the manufacturer.

Quite certain, I can actually watch it seep out.

EddieWalker said:
How often do you actually use the quick disconnects? If it's daily, they might be worth the effort. I put them on my tractor for my grapple and fond that they are such a pain to deal with that it's not worth having them. I took mine off nad just put regular fittings on there to tighten and untighten with a pair of wrenches. If I have the bucket on, I just screw on a cap to keep the ends clean. It's made life so much easier for me just doing it this way.

Good luck,
Eddie

I use them often so will have to tackle this. I have attached a picture from the day I installed the rear remotes so you know what I am talking about.