Return-Path: Received: from www.sequoianet.com ([206.242.77.5]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-52269U2500L250S0V35) with ESMTP id com for ; Mon, 21 Jun 1999 18:04:39 -0400 Received: from inet001.cardell.com (INET001.sequoianet.com [207.87.248.2]) by www.sequoianet.com (Post.Office MTA v3.1.2 release (PO205-101c) ID# 0-51638U1000L1000S0) with SMTP id AAA212 for ; Mon, 21 Jun 1999 18:05:00 -0400 Received: from ccMail by inet001.cardell.com (ccMail Link to SMTP R8.00.01) id AA930002817; Mon, 21 Jun 99 18:07:06 -0500 Message-Id: <9906219300.AA930002817@inet001.cardell.com> Date: Mon, 21 Jun 99 18:02:41 -0500 From: To: Subject: Re:hydraulic pump intermittent activation X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Bob Jude asks about hydraulic pump intermittent activation... Before you buy a new pump, I'd sequentially isolate each cylinder (and the cross over valve) and see if that affects your problem. Disconnect the lines at the cylinder, cap them off and then see if the time to activate changes. You can do this now without gages. It's not bad pressure switches if the activation is reasonably periodic (constant time intervals). I don't know what's inside the pump but there have to be check valves on each circuit and I imagine one of those could be the problem. But I suspect you'll find it's one of the cyclinders leaking internally or the cross over valve. While we're on this, my system makes a loud bang noise when the switch is moved to the down position. I imagine this is due to the high pressure relief valve at the pump openning to depressurize the up circuit. Is a bang (at this particular point) normal or is it a sign of something wrong? Regards, Ed de Chazal >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML homepage: http://www.olsusa.com/Users/Mkaye/maillist.html