Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Tue, 08 Feb 2005 11:53:57 -0500 Message-ID: X-Original-Return-Path: Received: from mta-out-1.udlp.com ([207.109.1.8] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 720241 for lml@lancaironline.net; Tue, 08 Feb 2005 09:34:57 -0500 Received-SPF: pass receiver=logan.com; client-ip=207.109.1.8; envelope-from=Christopher.Zavatson@udlp.com Received: from asdmngwia.mpls.udlp.com (asdmngwia.mpls.udlp.com [10.1.62.22]) by mta-out-1.udlp.com (8.12.10/8.12.10) with ESMTP id j18CT9u2013283 for ; Tue, 8 Feb 2005 06:29:09 -0600 Received: from DM-MN-06-MTA by asdmngwia.mpls.udlp.com with Novell_GroupWise; Tue, 08 Feb 2005 08:33:22 -0600 X-Original-Message-Id: X-Mailer: Novell GroupWise Internet Agent 6.0.2 X-Original-Date: Tue, 08 Feb 2005 08:33:12 -0600 From: "Christopher Zavatson" X-Original-To: Subject: [LML] Hydraulic pressure:LNC2 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Disposition: inline Gerard, Did it shoot up with the pump running or drift up over several minutes? The hydraulic pressure is very sensitive to system temperature changes. Cooling the system can cause sufficient loss to required a recharge by the pump. Conversely when heated, temperatures can cause the pressure to bump up against the relief valve. I have had a cylinder at 2000+ plus with no ill effect. The hydraulic test rig was close to the hangar door with a single cylinder pressurized to 1200 psi and isolated from the pump. The sun swung around at warmed the cylinder. The next glance at the pressure gauge showed it on the stop at 2000+ psi. I wouldn't worry too much about 1700psi. If it goes higher you might want to adjust the relief valve down a bit. To test the actual relief valve setting, force the pump on for a second or two after the pressure switch has turned the system off. Your gauge will tell you what setting you have. If you do make adjustments keep in mind that the relief valve setting must remain higher than the pressure switch setting by some margin. Chris Zavatson N91CZ 360-std 900 hrs