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Date: Mon, 12 Jul 1999 22:23:38 -0400
To: lancair.list@olsusa.com
From: Marvin Kaye <marvkaye@olsusa.com>
Subject: Fabricating hydraulic hoses
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>>
If you are getting ready fabricate your hydraulic hoses I have a few
comments regarding the procedure as outlined in the manual.  First of all,
they suggest the use of a #11 drill as a mandrel... I tried it and managed
to break the drill trying to remove it from the hose after the first part
of the hose fitting was applied.   I decided a piece of 3/16 mild steel rod
made lots more sense, as it is about .005" or so smaller and nowhere near
as brittle as a drill.  I cut a piece of hardware rod ($1.69 for 36" at a
local Home Depot, Lowes, Ace Hardware, etc) about 12" long and rounded one
end on the grinder.  Now I apply a little grease to the rod, insert it into
the hose rounded end first and apply the first part of the fitting.  Remove
the hose from your gripping fixture, grab the end of the rod that's
sticking out of the hose with your vise and pull the hose from the rod...
works great.  

When it's time to insert the inner (barbed) part of the fitting into the
hose I lube up both hose end and the fitting with LPS lubricant (Liquid
Wrench works well also) and then start screwing the fitting into the hose.
Keep the wrench moving and watch for the end piece of the fitting that
you're screwing in to get close to the sleeve... slow down for that last
turn  / turn & a half, as if you keep reefing on that fitting you'll strip
the end of it right off on the bottom of the sleeve's threads.  I know,
that's what happened to the first one I installed.  If you look at the
threads on the barb end of the fitting you'll notice that they stop about
1/8" from the flat face that the barb sticks out of.  The sleeve probably
has only about 4-5 internal threads itself, which means that you can spin
the barb end right past the point of contact with the sleeve without even
knowing.  When you're careful getting to those last few threads (slow down
and watch the two parts come together) you'll feel the two parts touch and
know that it's time to stop.

I hope this helps someone out there.

     <Marv>
 


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