X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Sun, 17 Sep 2006 22:56:22 -0400 Message-ID: X-Original-Return-Path: Received: from mxsf20.cluster1.charter.net ([209.225.28.220] verified) by logan.com (CommuniGate Pro SMTP 5.1c.4) with ESMTP id 1405893 for lml@lancaironline.net; Sat, 16 Sep 2006 10:18:11 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.225.28.220; envelope-from=LHenney@charter.net Received: from mxip04a.cluster1.charter.net (mxip04a.cluster1.charter.net [209.225.28.134]) by mxsf20.cluster1.charter.net (8.12.11.20060308/8.12.11) with ESMTP id k8GEHOTY010996 for ; Sat, 16 Sep 2006 10:17:24 -0400 Received: from 68-116-130-237.dhcp.ftwo.tx.charter.com (HELO LHenneyLaptop) ([68.116.130.237]) by mxip04a.cluster1.charter.net with ESMTP; 16 Sep 2006 10:17:24 -0400 X-IronPort-AV: i="4.09,174,1157342400"; d="scan'208,217"; a="66583231:sNHT85530596" From: "LHenney" X-Original-To: "'Lancair List \(Lancair Mailing List\)'" Subject: FW: [LML] LNC2 Hyd Spool Valve Reverse Revisited X-Original-Date: Sat, 16 Sep 2006 10:17:25 -0400 X-Original-Message-ID: <010101c6d99a$d63a1700$650fa8c0@LHenneyLaptop> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0102_01C6D979.4F287700" X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 Thread-Index: AcbZlqo7MBkXVTWwRhq4/51MvWjjMwAA9i5w This is a multi-part message in MIME format. ------=_NextPart_000_0102_01C6D979.4F287700 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Chris, Thanks a ton for all the perfectly clear response. <> I don't understand this conclusion.?? I apparently concluded this in error. I assumed the downside back pressure was caused by leak through. I now know that the downside back pressure is always present and may not indicate an internal leak. Thanks again, we'll take a closer look. Larry _____ From: Christopher Zavatson [mailto:Christopher.Zavatson@baesystems.com] Sent: Wednesday, September 13, 2006 9:16 AM Subject: Re: [LML] LNC2 Hyd Spool Valve Reverse Revisited Larry, <>This is normal. The back pressure circuit does not open until the spool valve is moved by the pump. <> There is a cleaner way. After you open the dump valve, bump the hydraulic motor in the up direction to let the spool valve open the back pressure circuit. You can then raise the gear by hand. <> I don't understand this conclusion.?? <> Yes. <> Yes The "poor man's" test for the reversed spool valve is to reverse direction while the gear is on its way up. Aren't these hydraulics fun. Chris Chris Zavatson N91CZ 360std. www.N91CZ.com ------=_NextPart_000_0102_01C6D979.4F287700 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Chris, =

Thanks a ton for all the perfectly = clear response. 

 

<<This indicates we have a internal cylinder leak.>> I don't understand = this conclusion.??

I apparently concluded this in error.  I assumed the downside back pressure was caused by leak through.  I now know that the downside back pressure is always = present and may not indicate an internal leak.

 

Thanks again,  we’ll = take a closer look.

Larry

 

From: Christopher Zavatson [mailto:Christopher.Zavatson@baesystems.com]
Sent: Wednesday, = September 13, 2006 9:16 AM
Subject: Re: [LML] LNC2 = Hyd Spool Valve Reverse Revisited

 

Larry,

<<The gear could not be raised by hand even with the dump valve open.>>This = is normal.  The back pressure circuit does not open until the spool = valve is moved by the pump.

 

<<We cracked a hyd fitting to relieve the pressure (which worked).  = >> There is a cleaner way.  After you open the dump valve, bump the = hydraulic motor in the up direction to let the spool valve open the back pressure circuit.  You can then raise the gear by = hand. 

 

<<This indicates we have a internal cylinder leak.>> I don't understand = this conclusion.??

 

<<However, is this only true in one direction?>> = Yes.

 

<<That is, when the gear are up, does it bleed the downside pressure?>> = Yes

 

The = "poor man's" test for the reversed spool valve is to reverse direction = while the gear is on its way up.

 

Aren't = these hydraulics fun.

Chris

 

 

 

 

Chris = Zavatson

N91CZ

360std.

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