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- Thread starter steviep
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quicksandfarmer
Elite Member
Depends on the fitting. On NPT fittings, pipe dope. One of the attractions of other types of fittings is that they seal without needing a thread compound.
RNeumann
Elite Member
Some guys love locktite. Typically it makes a good seal but it’s hard to get apart.
Be careful with other sealers like Teflon as they can cause issues if you get any inside the hydraulic fitting.
Be careful with other sealers like Teflon as they can cause issues if you get any inside the hydraulic fitting.
crazyal
Super Member
Just had to replace one of the lines going to my chute rotator today. They used teflon tape from the factory on the pipe threaded end that the disconnect was attached to. Just make sure that the tape doesn't go past the end of the threads so if it comes off it can't get into your hydraulic system.
joeu235
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If a fitting uses the threads to seal (tapered pipe fittings), the joint needs sealant. If the threads just hold the seals together (compression, flarred, etc), you should not use anything.
radios1
Elite Member
Teflon gets destroyed by petroleum products, don't use that!.. I know this from experience!..
Ritothebull
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The make a gas rated teflon tape, its heavier and more of a yellow color.
ericm979
Super Member
For NPT threads I've used Permatex 80632 teflon sealant made for hydraulic joints, and Loctite 545 also made for hydraulic joints. The Loctite works much better. It does not make the fittings difficult to loosen. I prefer to use JIC fittings where I can and NPT where I have to.
WranglerX
Super Member
On tapered threads (NPT) PTFE tape or "dope"...
On straight threads, no tape or dope...
I hate tape and it hates me.... Never had great success with it....
My go to....
Dale
On straight threads, no tape or dope...
I hate tape and it hates me.... Never had great success with it....
My go to....
Dale
WranglerX
Super Member
That be "natural gas".... Not liquid gasses...
A little fyi for all tape users...
Thread seal tape - Wikipedia
Dale
Thread tape with NPT is mostly for lubrication so one can tighten properly. The threads do the sealing.
WranglerX
Super Member
LD1
Epic Contributor
Actually NPT DOES require a sealant.
NPTF is the one that is "claimed" not to need it.
But real world is different than an engineer sitting behind a desk making a claim that "no sealant required".
NPSM, JIC, and ORB are the only common fittings you will find on your tractor that requires NO sealant.
NPT and NPTF....use the sealant regardless of anyones claims. If it truly were a "dryseal" as they claim....why do huge corporations and mfg companies use it if they dont have to? Think about all those wasted dollars on sealant.
Stay away from tape in hydraulics. Sure it "can" be used and it will work. And the odds of having a problem are pretty slim....but it only takes once to learn your costly lesson and hours trying to figure out what happened.
Loctite 545. Nothing better for hydraulics IMO
NPTF is the one that is "claimed" not to need it.
But real world is different than an engineer sitting behind a desk making a claim that "no sealant required".
NPSM, JIC, and ORB are the only common fittings you will find on your tractor that requires NO sealant.
NPT and NPTF....use the sealant regardless of anyones claims. If it truly were a "dryseal" as they claim....why do huge corporations and mfg companies use it if they dont have to? Think about all those wasted dollars on sealant.
Stay away from tape in hydraulics. Sure it "can" be used and it will work. And the odds of having a problem are pretty slim....but it only takes once to learn your costly lesson and hours trying to figure out what happened.
Loctite 545. Nothing better for hydraulics IMO
ArlyA
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I worked for Terex utility division Terex Utilities
While there, they said they would not use tape on anything, but would use Teflon dope on NPT threads. They had got tape into valves some years previous and would not use it again.
While there, they said they would not use tape on anything, but would use Teflon dope on NPT threads. They had got tape into valves some years previous and would not use it again.
I use yellow "Gas" tape exclusively for all of my NPT type connections. Works great on tractor hydraulic oils with no break down and no leaks after several years of hard use. I have not had much luck with dope on hydraulic oil lines- specifically Permatex brand.
Uses definition for yellow gas tape from Lowes: Manufactured especially for natural gas, propane, butane, water, oil and chemical lines.
bigdeano
Platinum Member
I use blue Loctite, 242 I think is the number. I only use Teflon tape if I can't get the oil off the fitting or don't have time to let the Loctite set up.
LD1
Epic Contributor
545 is actually made for sealing pipe threads.
222 (purple), 242 (blue), and 262 (red) are not designed as "sealants". They are designed as thread "lockers" to prevent fastener loosening.
Perhaps thats why people that complain about using "loctite" making the fittings harder to remove. Becasue 545 seals well, and is just as easy to remove a fitting as teflon tape or paste
222 (purple), 242 (blue), and 262 (red) are not designed as "sealants". They are designed as thread "lockers" to prevent fastener loosening.
Perhaps thats why people that complain about using "loctite" making the fittings harder to remove. Becasue 545 seals well, and is just as easy to remove a fitting as teflon tape or paste
Deere Dude
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I used 242 on thousands of pipe threads and never a problem getting them apart. Always a good seal. Never tried 545. Actually there is a Locktite number for hydraulic usage pipe threads, have to look it up though on the Locktite website.
LD1
Epic Contributor
Deere Dude
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Thanks LD1. I was busy. I used to joke, although truthfully, that I could put compound on a pipe thread from 2 feet away. Just aim and squirt some 242 on it.
