PTFE vs. TFE

[teg]

OH, goodie... more acronyms :confused2:

:thumbsup::thumbsup::thumbsup: Thanks for the good information.... and yes, I had to redo some of my connections to be able to make other connections work. I also, reversed the high pressure return with the low pressure return... lucky I figured that one out before hooking up the hoses... caught it during one of my many "follow the hoses" checks.

 

[slowzuki]

As a note for others looking at this thread in the future, never use teflon tape in any threads on a hydraulic system. The stringing bits of it can get inside and get stuck inside important parts of the hydraulic system. The liquid pipe dopes (most of them anyways) won't harden in oil so they just get mixed in, preventing a clogging problem.

 

[kennyd]

As a note for others looking at this thread in the future, never use teflon tape in any threads on a hydraulic system. The stringing bits of it can get inside and get stuck inside important parts of the hydraulic system. The liquid pipe dopes (most of them anyways) won't harden in oil so they just get mixed in, preventing a clogging problem.

That great advice falls on many deaf ears 'round here:thumbsup: There have recently been several threads dedicated to that very subject.

 

[Ford tractor]

Are you saying that NPT is done dry? or are you talking about the other types??? I didn't want ANY leaks so I used the paste on the NPT connections.

Can you explain a little more about "...bugger up the entire system..." What exactly would getting some of this paste mixed up in say the 5-6 gallons that my system uses. I would like to know if I need to change the hydraulic oil since I'm sure a little bit might have gotten in there.

Sorry to have posted and run, but you know how it goes some days.

NPT pipe fittings like from the hardware store are used on low pressure systems. The technical discussion occurred without me (and far better than I could do it too!). Basically, real hydraulic fittings are engineered to be assembled dry and they will stay that way when correctly torqued. Too loose and too tight are equally bad by the way.

If you've ever plumbed up stuff in the house and found the stringy PTFE tape or gobs of the paste in the faucet screen you know that stuff does not stay put. Running it through hydraulic pumps and valves that may have clearances in the millionth's of an inch isn't good. Odd as it may seem, there are worse things (and more expensive overall) than a moist fitting.

Just my $0.02 including tax. Take it or leave it as you see fit.

 

[teg]

It'll take it!!! It's *ALL* good information... By the way the whole write up of the finish spool is at the link below... I put it in the kubota section mainly because it's about one of those models (hindsight, should have posted in hydraulics)

http://www.tractorbynet.com/forums/...7948-instructions-add-extra-spools-l2800.html

Thanks again... Dan/teg

 

[SpringHollow]

Unfortunately, there are still a lot of NPT fittings on many of our hydraulic systems and they require sealant. I have switched a few over on mine but that is really long term thinking since the adapter i need to use is still NPT so it only helps me when i change the hose the next time. For really clean fittings, there are liquid sealants that can be used. But most hose repairs are not done in such clean conditions. So we have to use paste or tape. Lots of factory hydraulic items are done with tape. Either product causes a problem if done wrong.

Ken