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Reply-To: lancair.list@olsusa.com
From: "Scott Krueger" <sky2high@hotmail.com>
To: lancair.list@olsusa.com
Cc: edechazal@mindspring.com, Sky2high@aol.com
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Subject: LNC2  Hydraulic problems
Date: Tue, 29 May 2001 09:40:05 -0500
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Ed,

Thanks for the real data. This helps a great deal.  You wrote:

<...up pressure switch..off..1200 psi and kicks back on at 800.>

and

<The pump was sent in, a valve was found to be reversed and corrected and, 
sure enough, the behavior changed.>

When I installed the new pump, the lo pressure bleed also stopped, but the 
hi pressure (gear up) continues to bleed down to a lower pressure quickly.  
Since you have pressure gauges attached, have you, or can you test your 
retracted gear on jacks such that you could record the pressure after, say 
1/2 hour intervals.  I am in denial that a new pump could still have 
ridiculous quality control problems so that valves are installed backwards 
only to be fixed by pulling the pump and sending it in the repair department 
so they can resolve the stated problem and change the behavior of the pump 
on the other side.  BTW, Mercury marine uses these pumps for boat hydraulic 
autopilots and they are available for only $399.

You also wrote:

< ...same intercom noise 1 second before the pump kicks on.>

Some have suggested that an MOV or diode on the relay coil would fix this 
problem -- not so, these are used to eliminate the spike caused by the field 
collapse when the relay is released, not the sloppy pressure switch contacts 
arcing as they make -- it is a 3rd generation switch problem.  My second 
generation switch was very touchy and required frequent adjustment -- Last 
Spetember, I had to settle for 3rd in my class (by 1 second) at the Redmond 
100 because, when cold, the switch wouldn't shut the pump off so I had to 
pull the breaker and then remember to regularly reset it -- sometimes 
reminded by the rush of cold air -- probably losing speed by door sag drag.

Misery loves company, but it is unfortunate that others have these problems 
also.  I will not allow this maintenance nightmare occur in the Legacy.  I 
am now also looking for alternate pumps.  I would appreciate the information 
about the pressure gauges you have used.

I am only 1.5 hours from Rochester, MI -- Love to come and visit.  What 
airport are you at?  Call me anytime - my cell phone at the institution 
incarceration location is 630-561-0400.

Scott Krueger
N92EX
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