[AT] Hydraulic fittings

[charliehill]

When you find tape in the hydraulic system it's because of the way the tape 
was installed.  I use the paste but with the tape you start at the root of 
the threads not the end of the pipe and wrap the tape the same was as the 
threads run and stop it a couple of threads back from the end of the pipe. 
That way when you screw the pipe into the fitting the tape doesn't try to 
unwrap and it doesn't get down into the fluid flow.   A lot of folks wrap 
the stuff so that it's hanging all over the end of the pipe nipple.
----- Original Message ----- 
From: <K7jdj at aol.com>
To: <at at lists.antique-tractor.com>
Sent: Friday, August 14, 2009 4:19 PM
Subject: Re: [AT] Hydraulic fittings


> In a message dated 8/14/2009 11:06:46 A.M. Pacific Daylight Time,
> moscowengnr at yahoo.com writes:
>
> The first thing that is needed is knowledge of which type of fitting or
> thread that you have. For pipe threads there are 2 common type in the US - 
> NPT
> and NPTF (for Fuel). They may go together, but they are different. For
> either  type I would recommend either a paste or a Teflon tape. There is 
> also
> straight  pipe threads which may also screw together, but does not seal
> without some other  sealing mechanism such as a combination of a sealer 
> and a jam
> nut.
>
>
> Very good summary.  Like so many mechanical devices a little common  sense
> goes a long way.
>
> I have noticed Teflon tape in filters.
>
> A  couple of months ago I spent a several days working on a new to me 
> "skid
> steer"  that lost drive on one side.  This machine is driven by two pumps
> and  motors.  The pumps each have their own suction filters and pick ups.
> The problem turned out to be a plastic cap (the type that comes on new 
> hose
> fittings etc) that had been sucked up and completely blocked the pick up 
> for
> the  pump that powered the motor on the left side.
>
> I felt a little dumb when I  located the problem but glad I didn't need to
> speed a couple of thousand on new  pump and/or motor.
>
> Gary
>
> Renton, WA
>
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