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Date: Mon, 05 Oct 2009 14:12:47 -0400
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Subject: Re: Lancair 320/360 hydraulic system questions and fixes
From: Lorn H Olsen <lorn@dynacomm.us>
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Depending only on o-ring friction to keep the spool in place in a high  
vibration environment does not seem to be a good idea. I suspect the  
only way to accomplish this is redesign the spool with a spring loaded  
ball detent to help keep the spool in position or at least something  
to keep the check valve open as needed.
. . . However I don't think Parker/OilDyne would be interested in that  
idea . . . .

Wolfgang

----- Original Message -----
> From: Chris Zavatson
> To: Wolfgang ; Lorn Olsen ; Lancair Mailing List
> Cc: Christopher.Zavatson@baesystems.com ; randystuart@hotmail.com ; jmack102ea@gmail.com 
>  ; JohnM@Lancair.com
> Sent: Sunday, October 04, 2009 7:37 PM
> Subject: Re: Lancair 320/360 hydraulic system questions and fixes
>
> "Problem #2 is that vibration and pump internal leakage can move the  
> spool valve off it's position of all to one side or the other while  
> the pump is not running."
>
> So the question still remains:  Why do some spools return to center  
> while other do not?  All are subject to vibration.  My preference  
> would be to identify the root cause and then decide if it can or  
> should be addressed directly.  It may be as simple as switching out  
> a 20 cent O-ring on the spool.
>
>
> Chris Zavatson
> N91CZ
> 360std
> www.N91CZ.com
>
--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,635 hrs, N31161, Y47, SE Michigan