X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-ma02.mx.aol.com ([64.12.206.40] verified) by logan.com (CommuniGate Pro SMTP 6.0.2) with ESMTP id 6140931 for lml@lancaironline.net; Tue, 26 Mar 2013 00:59:08 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.206.40; envelope-from=Sky2high@aol.com Received: from mtaomg-ma02.r1000.mx.aol.com (mtaomg-ma02.r1000.mx.aol.com [172.29.41.9]) by imr-ma02.mx.aol.com (Outbound Mail Relay) with ESMTP id 04EF41C0000A6 for ; Tue, 26 Mar 2013 00:58:34 -0400 (EDT) Received: from core-mtd005c.r1000.mail.aol.com (core-mtd005.r1000.mail.aol.com [172.29.235.209]) by mtaomg-ma02.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id CB84AE000082 for ; Tue, 26 Mar 2013 00:58:33 -0400 (EDT) From: Sky2high@aol.com Full-name: Sky2high Message-ID: <2a89e.10ba5f58.3e8284f9@aol.com> Date: Tue, 26 Mar 2013 00:58:33 -0400 (EDT) Subject: Re: [LML] Re: Hydraulic gear pump failure To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_2a89e.10ba5f58.3e8284f9_boundary" X-Mailer: AOL 9.6 sub 168 X-Originating-IP: [67.175.156.123] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1364273913; bh=vRK1Ve2MsIe3kjekxuG/W0VjDiHmtwig62eiWUWF2Oc=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=wfYR5bgRLQMLzg10SDseR9vDZsO9NdlACEnvJTXuEWuXp3m0J0YFARhNMR06RorEU jzjEtdU1ekUmR0SdGaO2FzeqtwK3uXRXb4bHXGSMfgaAtu9jnXsaudbi/GhjHN69Wa yzXUZNlCLM0YOVF0pkohxiqIiEnyNYfGgWmJdq+E= X-AOL-SCOLL-SCORE: 0:2:462174144:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d290951512af93bda --part1_2a89e.10ba5f58.3e8284f9_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Angier, Relays usually incorporate two coils - a "pull" and a "hold" coil - and a system of springs (to return the solenoid when power is released) to best function for a particular task. A master contactor pulls quite slowly/hard but holds quite easily. This is because the master solenoid remains closed throughout the duration of the trip (i.e. "continuous duty"). A starter contactor, on the other hand, "pulls" quite easily (to close the "gap" quickly to minimize arching from the larger current loads created by the starter motor) and is only designed to "hold" for only short periods of time. (i.e. "intermittent duty"). If you look long enough you will find what you need here. _http://www.texasindustrialelectric.com/relays.asp_ (http://www.texasindustrialelectric.com/relays.asp) Grayhawk In a message dated 3/25/2013 6:44:33 P.M. Central Daylight Time, N4ZQ@VERIZON.NET writes: About 3 mos ago, the high side relay failed while 4ZQ was up on jacks. I figured that old age (original kit) plus X number of cycles during construction took that relay to the end of its useful life. So trying to kill two birds with one stone, I replaced both hi/lo relays with new (chinese) from the local auto parts store. The cause of yesterday's gear failure turned out to be the NEW low side relay, and it had just 14 cycles.... So, on the assumption that relay quality differs, who makes a HIGH quality relay with the same footprint as those that came with the kit? Any reason why they should not be continuous duty type? Angier Ames N4ZQ -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html --part1_2a89e.10ba5f58.3e8284f9_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Angier,
 
Relays usually incorporate two coils - a "pull" and a "hold" coil - an= d a=20 system of springs (to return the solenoid when power is released) to best= =20 function for a particular task. A master contactor pulls quite slowly/hard = but=20 holds quite easily. This is because the master solenoid remains closed=20 throughout the duration of the trip (i.e. "continuous duty"). A starter=20 contactor, on the other hand, "pulls" quite easily (to close the "gap" quic= kly=20 to minimize arching from the larger current loads created by the starter mo= tor)=20 and is only designed to "hold" for only short periods of time. (i.e.=20 "intermittent duty").
 
If you look long enough you will find what you need here.
 
http://www.texas= industrialelectric.com/relays.asp
 
Grayhawk
 
In a message dated 3/25/2013 6:44:33 P.M. Central Daylight Time,=20 N4ZQ@VERIZON.NET writes:
= About 3=20 mos ago, the high side relay failed while 4ZQ was up on jacks. I figured = that=20 old age (original kit) plus X number of cycles during construction took t= hat=20 relay to the end of its useful life. So trying to kill two birds with one= =20 stone, I replaced both hi/lo relays with new (chinese) from the local aut= o=20 parts store.

The cause of yesterday's gear failure turned out to b= e the=20 NEW low side relay, and it had just 14 cycles....

So, on the assum= ption=20 that relay quality differs, who makes a HIGH quality relay with the same= =20 footprint as those that
came with the kit? Any reason why they should = not=20 be continuous duty type?

Angier Ames
N4ZQ
--
For archives= and=20 unsub=20 http://mail.lancaironline.net:81/lists/lml/List.html --part1_2a89e.10ba5f58.3e8284f9_boundary--