X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Wed, 13 Sep 2006 09:16:11 -0400 Message-ID: X-Original-Return-Path: Received: from mta-out-1.udlp.com ([207.109.1.8] verified) by logan.com (CommuniGate Pro SMTP 5.1c.4) with ESMTP id 1400166 for lml@lancaironline.net; Tue, 12 Sep 2006 20:35:57 -0400 Received-SPF: none receiver=logan.com; client-ip=207.109.1.8; envelope-from=Christopher.Zavatson@baesystems.com Received: from mnexch01.MSGDOMAIN.MPLS.UDLP.COM ([10.66.62.99]) by mta-out-1.udlp.com (8.13.6/8.13.6) with ESMTP id k8CNnZtt021735 for ; Tue, 12 Sep 2006 18:49:36 -0500 Received: from smtp.udlp.com ([10.66.69.54] RDNS failed) by mnexch01.MSGDOMAIN.MPLS.UDLP.COM with Microsoft SMTPSVC(6.0.3790.211); Tue, 12 Sep 2006 19:28:34 -0500 Received: from DM-MN-06-MTA by smtp.udlp.com with Novell_GroupWise; Tue, 12 Sep 2006 19:34:57 -0500 X-Original-Message-Id: X-Mailer: Novell GroupWise Internet Agent 6.5.6 X-Original-Date: Tue, 12 Sep 2006 19:34:48 -0500 From: "Christopher Zavatson" X-Original-To: Subject: Re: [LML] LNC2 Hyd Spool Valve Reverse Revisited Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=__Part40640F38.0__=" X-OriginalArrivalTime: 13 Sep 2006 00:28:34.0260 (UTC) FILETIME=[8C06D140:01C6D6CB] --=__Part40640F38.0__= Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit 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 --=__Part40640F38.0__= Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Description: HTML

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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