thread sealant for hydraulic fluid

Mike in Ohio · Oct 16, 2010

I got the parts back home to put the backhoe back together. There is 1 fitting that is a pipe thread. Would you guys use pipe dope or teflon tape on that or something else I don't know about? I dont think it is a high pressure line, Those are all flare fittings. Thanks alot, Mike

Rusty wheel · Oct 16, 2010

Loctite makes a thread sealent for hydraulic fittings. Probably available at NAPA.

msb · Oct 16, 2010

I would NOT use teflon tape.

Anonymous-0 · Oct 16, 2010

On pipe thread teflon tape will work. Just make sure to wrap it a couple threads from the end of the fitting so it can't get in the system and you'll be fine. Dave

bc · Oct 16, 2010

I use the thread sealant most places sell in a tube that is good for gas and oil. It is teflon based.

The rub on teflon tape is (and any thread sealant) is that you don't want any to overlap the end and inside to where it can get into your system and plug something up. Some people use it as long as they keep it back a hair from the end/inside.

The threads should seal all right anyway but the main thing the sealant does is lube the threads so they will tighten up to the right torque and go all the way in. I assume you are using npt (a tapered pipe thread) and not O-Ring Boss or J fittings both of which don't need any sealant but I use it on them to but keep it off the mating surface.

Allan in NE · Oct 17, 2010

Fer the life of me, I've never been able to make that liquid dope hold a seal so I've always used the darned tape.

Works like a charm; just have to make sure ya wrap it in the right direction (with the threads).

Allan

Allan in NE · Oct 17, 2010

Fer the life of me, I've never been able to make that liquid dope hold a seal so I've always used the darned tape.

Works like a charm; just have to make sure ya wrap it in the right direction (with the threads).

Allan

Chris (WA) · Oct 17, 2010

Rusty has you on the right track. Locktite has an anerobic pipe thread sealant that works well.
Thread tape can be used BUT make sure not to tape all the way out to the end of the threads. Stay back two or three threads.
What you want to avoid is the possibility of any tape sticking beyond the joint and shearing off into the fluid. That stuff will jam a pump or valve tighted than a tick!

Tx Jim · Oct 17, 2010

(quoted from post at 22:02:10 10/16/10) Those are all flare fittings. Thanks alot, Mike

Flare fittings are designed to not require any type of thread sealant as the flare is the seal not the threads.

agpilot · Oct 17, 2010

Hi Allan Could you expand "with the threads" as just on the "same angle" as the threads or does it mean the angle plus the "Direction in wraping" which would result in the tape going back out of the socket?
(to prevent tape from bunching up if wraped toward the socket) I am just asking to double check... Trying to be extra clear.. Thanks. ag.

Mike in Ohio · Oct 17, 2010

Thanks alot guys. Mike

Anonymous-0 · Oct 17, 2010

You wrap it so the last flap of tape doesn't try to unravel when you thread the fitting in. Wrap it clockwise so when the fitting is tightened, it pulls the tape tighter. Dave

thread sealant for hydraulic fluid

Mike in Ohio

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Rusty wheel

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msb

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Anonymous-0

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bc

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Allan in NE

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Allan in NE

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Chris (WA)

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Tx Jim

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agpilot

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Mike in Ohio

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Anonymous-0

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