X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 02 Jul 2008 12:41:56 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m23.mx.aol.com ([64.12.137.4] verified) by logan.com (CommuniGate Pro SMTP 5.2.4) with ESMTP id 2999993 for lml@lancaironline.net; Tue, 01 Jul 2008 18:37:23 -0400 Received: from VTAILJEFF@aol.com by imo-m23.mx.aol.com (mail_out_v38_r9.4.) id q.c50.3127a284 (37567) for ; Tue, 1 Jul 2008 18:37:17 -0400 (EDT) Received: from FWM-D17 (fwm-d17.webmail.aol.com [205.188.160.209]) by cia-mb04.mx.aol.com (v121.5) with ESMTP id MAILCIAMB044-92bf486ab19d373; Tue, 01 Jul 2008 18:37:17 -0400 References: X-Original-To: lml@lancaironline.net Subject: Re: [LML] Question about Hydraulic Pump X-Original-Date: Tue, 01 Jul 2008 18:37:17 -0400 X-AOL-IP: 76.215.109.85 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: vtailjeff@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CAA9E226CB56E1_868_6AF3_FWM-D17.sysops.aol.com" X-Mailer: AOL Webmail 37563-STANDARD Received: from 76.215.109.85 by FWM-D17.sysops.aol.com (205.188.160.209) with HTTP (WebMailUI); Tue, 01 Jul 2008 18:37:17 -0400 X-Original-Message-Id: <8CAA9E226C6922B-868-34FB@FWM-D17.sysops.aol.com> X-Spam-Flag:NO ----------MB_8CAA9E226CB56E1_868_6AF3_FWM-D17.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" what kind of airplane IV/ Legacy/ 360? -----Original Message----- From: GT-Phantom To: lml@lancaironline.net Sent: Mon, 30 Jun 2008 8:04 pm Subject: [LML] Question about Hydraulic Pump Hi all, ? I'm a buyer not a builder, and I'm trying to diagnose an intermittant gear problem. ? I've replaced the old-style pressure switches with the new ones, and it still occurs.? ? Sometimes when I raise the gear handle it works just like it should - the gear motor kicks on and runs quickly and solidly until the last motion stops with a solid "thunk."? Other times the motor runs as if against resistance, stops, then cycles every few seconds until the gear eventually retracts completely.? When this happens, if I put the gear handle down the gear does not extend - until I momentarily move the "dump" valve to the dump position and back, which immediately causes the pump to run until the gear is down and locked. ? So, I presume there is a double check-valve system in the pump which is supposed to completely release pressure on the non-working side which is "sticking." ? Questions: ? - Are the check valves INSIDE the pump assembly (I think they must be)? - Can they be refurbished, or do I have to buy a new pump? ? Thanks for your confirmation / tips. ? Bill ? ----------MB_8CAA9E226CB56E1_868_6AF3_FWM-D17.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii" what kind of airplane IV/ Legacy/ 360?


-----Original Message-----
From: GT-Phantom <gt_phantom@hotmail.com>
To: lml@lancaironline.net
Sent: Mon, 30 Jun 2008 8:04 pm
Subject: [LML] Question about Hydraulic Pump

Hi all,
 
I'm a buyer not a builder, and I'm trying to diagnose an intermittant gear problem.
 
I've replaced the old-style pressure switches with the new ones, and it still occurs. 
 
Sometimes when I raise the gear handle it works just like it should - the gear motor kicks on and runs quickly and solidly until the last motion stops with a solid "thunk."  Other times the motor runs as if against resistance, stops, then cycles every few seconds until the gear eventually retracts completely.  When this happens, if I put the gear handle down the gear does not extend - until I momentarily move the "dump" valve to the dump position and back, which immediately causes the pump to run until the gear is down and locked.
 
So, I presume there is a double check-valve system in the pump which is supposed to completely release pressure on the non-working side which is "sticking."
 
Questions:
 
- Are the check valves INSIDE the pump assembly (I think they must be)?
- Can they be refurbished, or do I have to buy a new pump?
 
Thanks for your confirmation / tips.
 
Bill
 
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