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Farmall & IHC Tractors Discussion Forum
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Pipe Dope or Teflon Tape for Hydraulic Hoses?

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JayWalt

09-13-2006 23:31:43




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Which should I use?
I have all new hoses for my 300u and plan on putting them on this weekend.
I prefer to put it on now, as my swivels are limited and having a leak would mean quite a bit of disassembly to fix one leak. I cant complain about the swivels, as I got the hoses free!!! =)




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JayWalt

09-15-2006 03:18:19




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 Re: Pipe Dope or Teflon Tape for Hydraulic Hoses? in reply to JayWalt, 09-13-2006 23:31:43  
HOLY MOLY what alot of replies. The site has been down for me for a few days =\
Anyways, I had concerns about tape for the very reason many of you mentioned. And yes I do know which way to wrap it =).

Here's the thing guys. I dont have many swivel fittings on my hoses, so if I had a leak, I'd be spending about 2 hours removing hoses and reassembling them (potentially having more leaks).
I suppose I wont use anything, maybe a little oil like was mentioned, and if I do have a leak, when I re-assemble everything I will use a sparing amount of dope on the outer part of the threads.

Wish me luck with no leaks!! All the potential havoc of disassembly are all new hoses and fittings/cylinders, so hopefully leaks wont be an issue.
I appreciate the help guys =)

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Erik in WI

09-14-2006 18:11:15




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 Re: Pipe Dope or Teflon Tape for Hydraulic Hoses? in reply to JayWalt, 09-13-2006 23:31:43  
I work for Canadian Pacific Railway as a Traveling Mechanic. All of our track mantainence equipment uses hydraulic power for work and travel, some times in excess of 5000 psi. So I guess this is my area of expertise.

I use teflon tape, just remember to wrap it the right direction, stay 2 threads up from the bottom of the fitting, use 2 wraps at the most and don't overtighten it.

Also, If you ever have the option of using O-Ring Boss fittings, USE THEM. They are far superior to pipe threads.

Erik in WI

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Ron Sorden

09-15-2006 10:10:19




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 Re: Pipe Dope or Teflon Tape for Hydraulic Hoses? in reply to Erik in WI, 09-14-2006 18:11:15  
Quote Erik in WI "I use teflon tape, just remember to wrap it the right direction, stay 2 threads up from the bottom of the fitting, use 2 wraps at the most and don't overtighten it"

Quote Hermit "Please remember teflon tape needs to go on in the right direction. If it's put on in the wrong direction, it will cause problems"

For my info only. What is the correct direction to put tape on???

Ron

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Erik in WI

09-15-2006 12:50:23




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 Re: Pipe Dope or Teflon Tape for Hydraulic Hoses? in reply to Ron Sorden, 09-15-2006 10:10:19  
Hold the roll of tape in your right hand, with the tape coming off the top of the roll, towards your left hand. Hold the fitting in your left hand, with the treads pointed towards you. start two threads up from the bottom and wrap down around the fitting, wraping up the treads..... When done, hold the fitting, where you just put tape, using the index finger and thumb on your left hand. Then turn the fitting to the right, or clockwise, one turn to tighten the tape. If the tape rolls off the fitting, you did it backwards. And wraping the wrong way is how people get teflon tape into the hydraulic system.

If I had 3 hands I could take pictures of how it is done to help the dialog, but I would probably be to busy getting more work done (HA)!

Good Luck
Erik in WI

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Hugh MacKay

09-14-2006 17:55:59




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 Re: Pipe Dope or Teflon Tape for Hydraulic Hoses? in reply to JayWalt, 09-13-2006 23:31:43  
Jay: In all my years with farm tractors, tapes and pastes were only used if an impossible thread leak occured on hydraulic lines. And even then damn spareingly. Those products do not work well in hydraulic filters, valves and pumps. Neither do they work well around diesel injector lines, but I guess you wouldn't have that problem with a 300.

Water lines, exhaust pipes, etc. are a whole different ball game.

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Hermit

09-14-2006 17:49:36




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 Re: Pipe Dope or Teflon Tape for Hydraulic Hoses? in reply to JayWalt, 09-13-2006 23:31:43  
Please remember teflon tape needs to go on in the right direction. If it's put on in the wrong direction, it will cause problems.



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CNKS

09-14-2006 17:41:02




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 Re: Pipe Dope or Teflon Tape for Hydraulic Hoses? in reply to JayWalt, 09-13-2006 23:31:43  
Had trouble with the hydraulic cylinders for the row markers on a planter. Disassembled them and found a piece of teflon tape blocking a passage. So no teflon tape around hydraulics.



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NDS

09-14-2006 14:07:28




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 Re: Pipe Dope or Teflon Tape for Hydraulic Hoses? in reply to JayWalt, 09-13-2006 23:31:43  
I do not claim to be pipefitter but I worked at large chemical plant for 37 years and have seen untold thousands of pipe jobs. We always used tape on screwed stainless pipe (mainly to prevent galling) and good grade of pipe dope on all other screwed pipe. Oil will probaly be as good to prevent leaks but pipe dope is better at preventing siezed threads if you want to take it apart. WE usually used FEL PRO C5A anti sieze compound.

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Andy Martin

09-14-2006 14:29:26




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 Re: Pipe Dope or Teflon Tape for Hydraulic Hoses? in reply to NDS, 09-14-2006 14:07:28  
Stainless steel on stainless steel is a totally different animal and galls worse than even aluminum, in my experience. If you don't use stainless-rated dope you risk damaging it from chloride cracking, etc.

Disassembly is why I use Teflon paste, however tractors operate at low temperatures (except for the exhaust system) when it comes to pipe joints. If you want to get carbon steel screwed joints apart after they have been at 400 degrees for two years they best have been doped.

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Allan In NE

09-14-2006 12:15:30




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 Re: Pipe Dope or Teflon Tape for Hydraulic Hoses? in reply to JayWalt, 09-13-2006 23:31:43  
Jay,

Neither.

Like Andy says, just tighten the fittings until they don't leak.

Allan



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RustyFarmall

09-14-2006 13:18:38




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 Re: Pipe Dope or Teflon Tape for Hydraulic Hoses? in reply to Allan In NE, 09-14-2006 12:15:30  
Kinda what I was thinking. If everything is new, you shoudn't need either one.



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El Toro

09-14-2006 12:13:06




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 Re: Pipe Dope or Teflon Tape for Hydraulic Hoses? in reply to JayWalt, 09-13-2006 23:31:43  
I would apply some gasoila soft set if you have pipe threads. If they're flared fittings you shouldn't need any sealant. Hal



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Andy Martin

09-14-2006 11:57:34




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 Re: Pipe Dope or Teflon Tape for Hydraulic Hoses? in reply to JayWalt, 09-13-2006 23:31:43  
Light oil is as good as anything on tapered threads. Pipe dope is primarily intended as a lubricant. If you have a bad joint dope will rarely help seal. Teflon tape is a good lubricant however pieces of it floating into small orifices in a hydraulic system is undesirable.

I use Teflon paste, sparingly, but light oil owrks about as well.



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Duane NC OH

09-14-2006 18:13:33




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 Re: Pipe Dope or Teflon Tape for Hydraulic Hoses? in reply to Andy Martin, 09-14-2006 11:57:34  
i agree with the statement the tape and dope are primarily a lubricant and not a sealant. that said i do use very little dope.

fwiw

Duane



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