Sender: "Marvin Kaye" <marv@lancaironline.net>
To: lml@lancaironline.net
Date: Fri, 25 Feb 2005 20:09:59 -0500
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From: "Larry Henney" <lhenney@attg.net>
Subject: RE: [LML] Hydraulic  diagnostic assistance needed
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>My problem is that hydraulic fluid is leaking from the
low side to the high side of the cylinder operating
the nose gear.  There are no leaks or at least no
visible hydraulic fluid leakage.


Art,

Concur totally and emphatically with Scott's thoughts on overcentering.
With overcentering done correctly I might not even worry with your above
comment.  However, I am not sure why you have certainty that the
internal leak is in the nose gear.

In my case I've seen a significant internal leak in the Lancair supplied
(600 psi rated) dump valve.  This is one of the 6 crossover points for
internal leaks (the cylinders being the remaining 6).  The most absolute
trouble shooting would be to get yourself 25 AN fittings to cap off the
hyd lines and systematically eliminate the valve and cylinders until the
crossover leak is eliminated.

There are occasionally other related issues to the LNC2 Hyd discussion
like a reversed spool valve or other internal pump failures.  However,
checking for leaks by isolating individual components would be my first
suggestion.

Larry