X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.51.79.189] (account marv@lancaironline.net) by logan.com (CommuniGate Pro WEBUSER 5.1c.4) with HTTP id 1403914 for lml@lancaironline.net; Fri, 15 Sep 2006 00:59:44 -0400 From: "Marvin Kaye" Subject: Re: Hyd Spool Valve Reverse Revisited To: lml X-Mailer: CommuniGate Pro WebUser v5.1c.4 Date: Fri, 15 Sep 2006 00:59:44 -0400 Message-ID: In-Reply-To: References: X-Priority: 3 MIME-Version: 1.0 Content-Type: text/plain;charset="iso-8859-1";format="flowed" Content-Transfer-Encoding: 8bit Posted for "Gerard O Connell" : Larry there is an extended piece on LNC2 hydraulics posted July 2001 by Scott Krueger N92EX. Ian Crowe also wrote me an extended problem solving guide for hyraulic leaks etc which I printed out and will search for. Below is a discussion of the test you spoke about from an old post: The operation of the system may seem to be almost completely normal with the spool valve reversed. Without gauges, the only symptom may be a slightly weak retraction at the top of the cycle, and you can overcome that problem by raising the high-side pressure switch setting. That was the way I had my system set up initially with the spool-valve problem. There is one other symptom, but it doesn't normally come up under normal operation. The gear won't come down immediately after a retraction or during a retraction near the top of the cycle (this is because the low-side pressure has increased during the retraction and the low-side pressure switch is open as the pressure bleeds off). If the spool valve is in correctly, you will be able to lower the gear at any point during the up cycle without the system hesitating. I say it doesn't come up under normal operation because once you raise the gear, you normally don't lower if for a while, and the pressure has time to bleed off. Therefore, it is possible to have a reversed spool valve and not really have any significant symptoms, if you don't have pressure gauges. If you are seeing pressure in the low side during the retraction cycle (increasing a little from the down setting all the way up), then I would check the spool valve. Gerard O Connell Melbourne, Australia VH-LPD (LNC2)