X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 05 Feb 2012 08:34:53 -0500 Message-ID: X-Original-Return-Path: Received: from nm36-vm3.bullet.mail.ne1.yahoo.com ([98.138.229.115] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with SMTP id 5382445 for lml@lancaironline.net; Sat, 04 Feb 2012 01:24:18 -0500 Received-SPF: none receiver=logan.com; client-ip=98.138.229.115; envelope-from=chris_zavatson@yahoo.com Received: from [98.138.90.56] by nm36.bullet.mail.ne1.yahoo.com with NNFMP; 04 Feb 2012 06:23:42 -0000 Received: from [98.138.226.167] by tm9.bullet.mail.ne1.yahoo.com with NNFMP; 04 Feb 2012 06:23:42 -0000 Received: from [127.0.0.1] by omp1068.mail.ne1.yahoo.com with NNFMP; 04 Feb 2012 06:23:42 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 261963.13623.bm@omp1068.mail.ne1.yahoo.com Received: (qmail 9861 invoked by uid 60001); 4 Feb 2012 06:23:41 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; 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Fri, 03 Feb 2012 22:23:41 PST X-Mailer: YahooMailWebService/0.8.116.331537 References: X-Original-Message-ID: <1328336621.41034.YahooMailNeo@web36908.mail.mud.yahoo.com> X-Original-Date: Fri, 3 Feb 2012 22:23:41 -0800 (PST) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Re: [LML] Re: 320/360 Hydraulic Pressure Switch X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-2114655128-438695433-1328336621=:41034" ---2114655128-438695433-1328336621=:41034 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Several folks have been asking privately about the spool centering springs = mentioned below.=A0 This link contains both schematics and photos=A0showing= how to revert=A0a new pump back to=A0the original 320/360 functionality.= =A0 =0Ahttp://www.n91cz.com/Hydraulics/Pump-Unlock.pdf=0A=A0=0AChris Zavats= on=0AN91CZ=0A360std=0Awww.N91CZ.net=0A=0A=0AFrom: Chris Zavatson =0ATo: lml@lancaironline.net =0ASent: Wednesday, February 1= , 2012 12:46 PM=0ASubject: [LML] Re: 320/360 Hydraulic Pressure Switch=0A= =0A=0ALorn,=0AHad the temperature been 90 or 100 degrees your pressure woul= d have been even higher.=A0 In some of my hydraulics videos, you will=A0see= the 2,000 psi gauge pegged on occasion during thermal heating tests.=0A=A0= =0Ahttp://www.n91cz.com/Hydraulics/Lancair_Hydraulics.htm=0A=A0=0AYour pred= icament=A0of having to crack a hydraulic line is exactly what can happen if= the spool centers after pump shut down.=A0 I find that a completely unacce= ptable design.=A0 Imagine taking off into IMC and the gear won't come up.= =A0 I had the opportunity to test out a pump in this configuration last sum= mer.=A0 Just as you experienced, I was able to reproduce a complete lock up= .=A0 =0Ahttp://www.n91cz.com/Hydraulics/NewPumpLockUp_0001.wmv=A0- hi res= =0Ahttp://www.n91cz.com/Hydraulics/NewPumpLockUp_0002.wmv=A0- low res=0A=A0= =0AAfter discussions with Lancair and Parker, I reverted the configuration = back to the original 320/360 config and all is good now.=A0 Only one side c= an ever be pressurized at a time.=A0 Unfortunately due to employee turn-ove= r, no one currently at Parker or Lancair knows why the centering springs we= re added.=A0 After reviewing the 320/360 system both agreed that a system l= ock up is possible using replacement pumps currently sold (108AMS32-CZZ-3V-= 14-08-Y).=A0 Parker sent me parts to revert three pumps back to the origina= l configuration.=A0=0A=A0=0AThe TRVs in our pumps are the lowest available = -fixed setting of 2,500 psi.=A0 This may be too high=A0to protect=A0some of= our components.=A0 I=A0have=A0run them up=A0to 2,000 psi.=A0 In flight, I = have seen 1,800 psi, descending from 18k into the southwest deserts.=0A=A0= =0AChris Zavatson=0AN91CZ=0A360std=0Awww.N91CZ.net=0A=A0=0A=A0=0A=0AFrom: L= orn H Olsen =0ATo: lml@lancaironline.net =0ASent: Wednesd= ay, February 1, 2012 6:33 AM=0ASubject: [LML] Re: 320/360 Hydraulic Pressur= e Switch=0A=0AAgain,=0A=0AMy Oildyne internal pressure switch came (set by = Oildyne) at 1,500 PSI. How do I know? I parked my plane on the ramp at Newp= ort News, Va in the evening. The temperature was 40=B0F. 3 days later, when= I was going to take off. The temperature was 80=B0F. I looked at my pressu= re gauges. Both the up and down were at 1,500 PSI. I had to crack a nut in = a hydraulic line to release the pressure. The gear would not go up or down,= at this pressure. The emergency dump valve would not release, at this pres= sure. The pump would not run at all, at this pressure.=0A=0ANow, I have Wol= fgang's high pressure adapter in the system. It runs the pump whenever the = pressure is high on both the up and the down side.=0A=0AThere is no specula= tion here. Just the facts, mam.=0A=0A=0A--=0ALorn H. 'Feathers' Olsen, MAA,= ASMEL, ASES, Comm, Inst=0ADynaComm, Corp., 248-345-0500, mailto:lorn@dynac= omm.us=0ALNC2, FB90/92, O-320-D1F, 1,800 hrs, N31161, Y47, SE Michigan=0A= =0A=0A--=0AFor archives and unsub http://mail.lancaironline.net:81/lists/lm= l/List.html ---2114655128-438695433-1328336621=:41034 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Several folks have been asking privately about t= he spool centering springs mentioned below.  This link contains both s= chematics and photos showing how to revert a new pump back to&nbs= p;the original 320/360 functionality. 
 
Chris Zavatson
N91CZ
360std


From:= Chris Zavatson <chris_zavatson@yahoo.com>
To: lml@lancaironline.net
Sent: Wednesday, February 1, 2012 12= :46 PM
Subject: [LML] Re= : 320/360 Hydraulic Pressure Switch

Lorn,
Had the temperature = been 90 or 100 degrees your pressure would have been even higher.  In = some of my hydraulics videos, you will see the 2,000 psi gauge pegged on = occasion during thermal heati= ng tests.
 
http://www.n91cz.com= /Hydraulics/Lancair_Hydraulics.htm
 
Your predicament&nbs= p;of having to crack a hydraulic line is exactly what can happen if the spo= ol centers after pump shut down.  I find that a completely unacceptabl= e design.  Imagine taking off into IMC and the gear won't come up.&nbs= p; I had the opportunity to test out a pump in this configuration last summ= er.  Just as you experienced, I was able to reproduce a complete lock = up. 
http://www.n91cz.com/Hydraulics/NewPumpLockUp_0001.wmv - hi= res
http://www.n91cz.com= /Hydraulics/NewPumpLockUp_0002.wmv - low res
 
After discussions wi= th Lancair and Parker, I reverted the configuration back to the original 320/360 config and all is good now.&nb= sp; Only one side can ever be pressurized at a time.  Unfortunately du= e to employee turn-over, no one currently at Parker or Lancair knows why th= e centering springs were added.  After reviewing the 320/360 system bo= th agreed that a system lock up is possible using replacement pumps current= ly sold (108AMS32-CZZ-3V-14-08-Y).  Parker sent me parts to revert thr= ee pumps back to the original configuration. 
 


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