X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 06 Jul 2006 01:08:32 -0400 Message-ID: X-Original-Return-Path: Received: from [66.224.195.26] (HELO pdt-usa.com) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTP id 1224911 for lml@lancaironline.net; Wed, 05 Jul 2006 14:18:09 -0400 Received-SPF: none receiver=logan.com; client-ip=66.224.195.26; envelope-from=jgarman@pdt-usa.com Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C6A05F.74EEC942" Subject: Re: LNC2 Hydraulic problem X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 X-Original-Date: Wed, 5 Jul 2006 11:18:47 -0700 X-Original-Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Re: LNC2 Hydraulic problem thread-index: AcagXGfV7BCkrHXSQ3CEEAy9i+r5Cg== From: "Jon Garman" X-Original-To: This is a multi-part message in MIME format. ------_=_NextPart_001_01C6A05F.74EEC942 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I have had the same problem as Matt reports - pressure is high, but gear does not go up. This can only happen if the low side is at the same pressure as the high side. This means a leak from high side to low side somewhere in the hydraulic system, could be any of the cylinders, the dump valve, or the spool valve. I have just finished rebuilding all the cylinders and making new hoses. My pump is at Lancair being rebuilt. I'll report results when the pump comes back. Note that if the low side is at the high side pressure, opening the dump valve does nothing, just as Matt reported. Same thing happens with mine. It seems like the only sure fire fix would be to add a second dump valve, from the low side back to the reservoir, only to be used momentarily when this problem happens, as a way to get the gear up. You can close it as soon as the pump starts running. Jon ------_=_NextPart_001_01C6A05F.74EEC942 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Re: LNC2 Hydraulic problem

I have had the same problem as Matt = reports - pressure is high, but gear does not go up. This can only = happen if the low side is at the same pressure as the high side. This = means a leak from high side to low side somewhere in the hydraulic = system, could be any of the cylinders, the dump valve, or the spool = valve. I have just finished rebuilding all the cylinders and making new = hoses. My pump is at Lancair being rebuilt. I'll report results when the = pump comes back.

Note that if the low side is at the = high side pressure, opening the dump valve does nothing, just as Matt = reported. Same thing happens with mine.

It seems like the only sure fire fix = would be to add a second dump valve, from the low side back to the = reservoir, only to be used momentarily when this problem happens, as a = way to get the gear up. You can close it as soon as the pump starts = running.

Jon

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