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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
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