Leaking fittings

[Bday]

I replumbed some lines on a tractor for a loader. Used loctite ptfe paste for sealer. Tightened the crap out of them, and tightened the crap out of them again. They are still weeping. What next? I hate hydraulic fittings!

 

[murphy1244]

What style fittings you using? I usually use Teflon tape.

 

[Dr Dave]

Teflon pipe paste works great.

 

[DT86]

What style fittings you using? I usually use Teflon tape.

I've actually had people that are "supposed" to know what they're talking about tell me not to put Teflon on hydro fittings. I never understood why. So guess what? I use it anyway!

 

[Dr Dave]

Teflon tape will work if your very carefull, do not get any in your hydro system. This usualy happens when taking apart a fitting,that has had tape on it, small peices can get in the system and caught up in valves, you would not want to get caught using it on a manlift or bucket truck! Its best not to use on hydralics.

 

[Bday]

I've actually had people that are "supposed" to know what they're talking about tell me not to put Teflon on hydro fittings. I never understood why. So guess what? I use it anyway!

Not sure what type of fittings they are. I bought ready made hoses at the local farm store. Used 1/2" to 1/2" female couple to connect the lines. The lines had quick disconnects on them that are now connected to the couplers and then the new lines.

 

[Dr Dave]

Are you using standard water/gas pipe coupler, these wont hold up well to hydralic pressure. The hydralic coupler will have six sided flats for a wrench, and is much thicker.

 

[murphy1244]

Are they straight thread or pipe thread? I've used Teflon tape for some time now. At work that's all we use at VanDorn Plastics

 

[Bday]

I believe they are pipe thread. I grabbed them from the hydraulic section next to the hoses. Had to get one from Napa because we were one shy of what we needed. The one from napa was the same fitting.

 

[murphy1244]

I believe they are pipe thread. I grabbed them from the hydraulic section next to the hoses. Had to get one from Napa because we were one shy of what we needed. The one from napa was the same fitting.

I am willing to bet if you look your fittings are not compatible.

 

[Soundguy]

do double check fittings types and make sure that if you have taper fittings they are ntp or ntpf

 

[Bday]

So if there tapered what coupler should I be using?

 

[2458n]

I would make sure of the fitting . water line rarely is exposed to 3000psi. The fitting would not be weeping if you had the correct set up. In some cases the tape can be dangerous floating around.

 

[J_J]

If the fittings are tapered, they are NPT, then use NPT fittings.

As far as Teflon tape on hyd fittings, it is general practice to not use it. The reason is that the tape will shred when loosen, and most people don't clean out the threads. and small bits of Teflon is pushed into the hyd flow and can jam up things in the hyd circuit.

Teflon paste is recommended or Loctite red or blue.

Npt fittings were not designed for repeated coupling, Each time you tighten, the threads are deformed a little more. Maybe 2 to 3 tightening and loosening.

Your best bet is to switch over to JIC fittings, and tighten the NPT one good time. JIC does not need Teflon.

 

[Zebrafive]

If the fittings are tapered, they are NPT, then use NPT fittings.

As far as Teflon tape on hyd fittings, it is general practice to not use it. The reason is that the tape will shred when loosen, and most people don't clean out the threads. and small bits of Teflon is pushed into the hyd flow and can jam up things in the hyd circuit.

Teflon paste is recommended or Loctite red or blue.

Npt fittings were not designed for repeated coupling, Each time you tighten, the threads are deformed a little more. Maybe 2 to 3 tightening and loosening.

Your best bet is to switch over to JIC fittings, and tighten the NPT one good time. JIC does not need Teflon.

+1
You may have over tightened the fitting the very first time and deformed the threads too much and that's why they leaked