Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Fri, 25 Feb 2005 13:29:38 -0500 Message-ID: X-Original-Return-Path: Received: from imo-d04.mx.aol.com ([205.188.157.36] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 759229 for lml@lancaironline.net; Fri, 25 Feb 2005 12:39:31 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.157.36; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-d04.mx.aol.com (mail_out_v37_r3.8.) id q.df.df7f83e (17377) for ; Fri, 25 Feb 2005 12:38:38 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Fri, 25 Feb 2005 12:38:38 EST Subject: Re: [LML] Hydraulic diagnostic assistance needed X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1109353118" X-Mailer: 9.0 Security Edition for Windows sub 5000 -------------------------------1109353118 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 2/25/2005 11:20:11 A.M. Central Standard Time, flycassutts@yahoo.com writes: Does anyone have any thoughts on this? Is it possibly the hydraulic pump that is not functioning correctly? If it is the motor mount bending, are there suggestions on how to fix this problem? Art, One reason the motor mount may be moving and the actuator force not being in a straight line is because the down stop is not set properly. All hydraulic actuators should be positively stopped in both directions before undue forces are placed on linkages. If you place your aircraft on jacks and extend the landing gear (say, by the dump valve) and have the overcenter links locked, disconnect the actuator rod end, position it so further extension will cause no damage, energize the hydraulic "down" system and check that you could reconnect the rod end to the overcenter link snugly (no slop). If the rod end is so extended that you cannot re-insert the bolt, you need to adjust the rod end and, probably, adjust the up stop too. This procedure should be used for both the nose and main gear. Failure to have the stops properly adjusted can lead to bent actuator rods, scored cylinders because of cocking, delamination of actuator anchors, damage to linkages, etc. Let us know if this was the problem. Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Fair and Balanced Opinions at No Charge! There is an oxymoron in that, somewhere... -------------------------------1109353118 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 2/25/2005 11:20:11 A.M. Central Standard Time,=20 flycassutts@yahoo.com writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Does=20 anyone have any thoughts on this? Is it possibly
the hydraulic pu= mp=20 that is not functioning correctly?
If it is the motor mount bending, a= re=20 there
suggestions on how to fix this problem?

Art,

One reason the motor mount may be moving and the actuator force not bei= ng=20 in a straight line is because the down stop is not set properly. All=20 hydraulic actuators should be positively stopped in both directions before u= ndue=20 forces are placed on linkages. If you place your aircraft on jacks and= =20 extend the landing gear (say, by the dump valve) and have the overcenter lin= ks=20 locked, disconnect the actuator rod end, position it so further extension wi= ll=20 cause no damage, energize the hydraulic "down" system and check that you cou= ld=20 reconnect the rod end to the overcenter link snugly (no slop). If the=20= rod=20 end is so extended that you cannot re-insert the bolt, you need to adjust th= e=20 rod end and, probably, adjust the up stop too. This procedure should b= e=20 used for both the nose and main gear.

Failure to have the stops properly adjusted can lead to bent actuator r= ods,=20 scored cylinders because of cocking, delamination of actuator anchors, damag= e to=20 linkages, etc.

Let us know if this was the problem.=20

Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)

Fai= r=20 and Balanced Opinions at No Charge!
There is an oxymoron in that,=20 somewhere...

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