LD1
Epic Contributor
They make it in fast cure versions.
But usually the time it takes me to assemble....pick up tools and clean up the mess....it's ample time for it not to leak.
Teflon tape on hydraulic fittings
- Thread starter PHIL850
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But usually the time it takes me to assemble....pick up tools and clean up the mess....it's ample time for it not to leak.
WranglerX
Super Member
I can not even get PTFE tape to seal on NPT water pipe plumbing sure as hell not going it do it on high pressure hydraulics....
There must be some secret to using the tape that no one has ever shared with me....
There must be some secret to using the tape that no one has ever shared with me....
With NPT, a thread sealant is necessary because the threads in the male are not full threads, as such, when screwed into a female end there is a spiral "gap" right through the connected joint.
However with NPTF (Dryseal), there is a full thread on both male and female ends which means a full thread contact throughout. So no sealant required.
Yes Teflon tape is a big no-no in hydraulics. Only to be used as an emergency measure and replaced ASAP. It should never be used on JIC or UNO joints, it only stuffs up the sealing even more.
However with NPTF (Dryseal), there is a full thread on both male and female ends which means a full thread contact throughout. So no sealant required.
Yes Teflon tape is a big no-no in hydraulics. Only to be used as an emergency measure and replaced ASAP. It should never be used on JIC or UNO joints, it only stuffs up the sealing even more.
npalen
Elite Member
I don't recall ever having an issue with the tape not sealing on 3000 PSI hydraulics. There have been occasions where I've had to wrap several revolutions to get some thickness.
I know some folks maintain that the tape is only to reduce friction to allow more thread engagement but I've found that several wraps provides more material for sealing.
LD1
Epic Contributor
Yes alot pf people repeat that.
Its a fundamental difference between theory and reality. What some engineer somewhere things will work when drawn out on paper....but in reality it isnt the case
lman
Veteran Member
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- Indiana
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- New Holland 3040, New Holland 1530, Oliver 1850
I recently installed a diverter valve on my tractor and used some thread sealant that I had available. After it sat overnight, I started the tractor and noticed several leaks at the fittings. I had teflon tape available so I removed all of the fittings and wrapped them with tape keeping away from the ends. I started the tractor and had no leaks. Tape seems to work for me and I guess that's what really counts.
Lineman North Florida
Elite Member
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- May 12, 2008
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- LaCrosse Florida
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- Farmtrac 360 DTC with FEL & John Deere 5093E with FEL ,Kubota SVL 75-2
Exactly, to be honest with you I don't know how most of us have managed on the farm all these years with this teflon tape that we use, you're last sentence pretty much sums it up.
TMGT
Elite Member
I use tape regularly on NPT hydraulic fittings, it's like any other sealant/lubricant, proper application is the key. I've checked fittings after assembly and opened up hyd. filters after hundreds of hours of use with no signs of tape entering the system.
A number of manufacturers use tape on hydraulic fittings, guess nobody told them they weren't supposed to.
Sent from my SM-G715U1 using TractorByNet mobile app
A number of manufacturers use tape on hydraulic fittings, guess nobody told them they weren't supposed to.
Sent from my SM-G715U1 using TractorByNet mobile app
npalen
Elite Member
The "Great Tape Debate" may go down in the TBN annals as one of the all time greats! I always enjoy these discussions!
Bottom line--use what works for YOU, liquid sealant or tape.
