X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Wed, 08 Nov 2006 11:26:46 -0500 Message-ID: X-Original-Return-Path: Received: from [148.177.2.33] (HELO ncsusraimgo02-ext.na.jnj.com) by logan.com (CommuniGate Pro SMTP 5.1.2) with ESMTPS id 1544579 for lml@lancaironline.net; Wed, 08 Nov 2006 10:58:01 -0500 Received-SPF: none receiver=logan.com; client-ip=148.177.2.33; envelope-from=GLaznic@MCCUS.JNJ.com Received: from unknown (HELO NCSUSRAEXIMS4.na.jnj.com) ([10.4.20.186]) by ncsusraimgo02-ext.na.jnj.com with ESMTP; 08 Nov 2006 10:57:25 -0500 X-IronPort-AV: i="4.09,401,1157342400"; d="scan'208,217"; a="11123099:sNHT180210078" Received: by NCSUSRAEXIMS4.na.jnj.com with Internet Mail Service (5.5.2658.3) id ; Wed, 8 Nov 2006 10:57:41 -0500 X-Original-Message-ID: <84C50C25120F254CACB81CDE4372EF4C83AA58@mccusfwexs2.na.jnj.com> From: "Laznicka, Garry [MCCUS]" X-Original-To: 'Christopher Zavatson' , Lancair list Subject: RE: L-360 Hydraulic System X-Original-Date: Wed, 8 Nov 2006 10:57:32 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2658.3) Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C7034D.C5E4BFEB" This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------_=_NextPart_001_01C7034D.C5E4BFEB Content-Type: text/plain; charset="windows-1252" Hi Chris, Thank you for pictures. Nice test fixture. Well perhaps I have some leak(s) somewhere and that what is causing my UP-Retract problems. I have gage on Low and High side lines. My Low gage is at 0 psi all the time when I activate High side to retract,... and vise-versa. Are you suggesting that I need to install the spool in reverse for power-pack to work properly for my (our) application? Well I sure could do that and test it that way. Regards, Garry L-360c -----Original Message----- From: Christopher Zavatson [mailto:Christopher.Zavatson@baesystems.com] Sent: Wednesday, November 08, 2006 10:41 AM To: Lancair list; Laznicka, Garry [MCCUS] Subject: RE: L-360 Hydraulic System Garry, <> Don't give up yet, there is more to the story. When this problem first surfaced several years ago, we determined that the build instructions for the pump were in error. I would not trust a reference by serial number because of this. Instead use the functional schematic from the Oildyne website applied to our application. To add to the confusion, note that the labels in the schematic for up and down need to be reversed. The more typical application does work during extension of the cylinder. Our application reverses the high and low pressure sides because our work stroke is during cylinder retraction. The fool proof way to determine if the valve is in backwards is to put a pressure gauge on the down circuit, even if temporarily. If the valve is in backwards, you will read several hundred psi during a retraction sequence - enough to make the down circuit think the gear is already in the down position. TRV=Thermal Relief Valve HPRV=High Pressure Relief Valve LPRV=Low Pressure Relief Valve Hydraulic test stand - in this photo - found a leaking, 'new' high pressure dump valve from Lancair (red handle) Highly recommend - Permanently installed hydraulic pressure gauges Chris Zavatson N91CZ 360 std www.N91CZ.com ------_=_NextPart_001_01C7034D.C5E4BFEB Content-Type: text/html; charset="windows-1252" Content-Transfer-Encoding: quoted-printable RE: L-360 Hydraulic System

Hi Chris,

Thank you for pictures. Nice test fixture. Well = perhaps I have some leak(s) somewhere and that what is causing my = UP-Retract problems.

I have gage on Low and High side lines. My Low gage = is at 0 psi all the time when I activate High side to retract,... and = vise-versa.

Are you suggesting that I need to install the spool = in reverse for power-pack to work properly for my (our) application? = Well I sure could do that and test it that way.

Regards,
Garry L-360c

-----Original Message-----
From: Christopher Zavatson [mailto:Christopher.Z= avatson@baesystems.com]
Sent: Wednesday, November 08, 2006 10:41 AM
To: Lancair list; Laznicka, Garry [MCCUS]
Subject: RE: L-360 Hydraulic System


Garry,

<<I just talked to folks at Oildyne about the = pump. By the way they were very helpful and friendly,... pleasant = experience. They informed me, that in fact my spool was installed = correctly. It appears that there is a hole on the face of the spool on = the "O" ring side, which needs to face toward DN side, thus = "O" ring side needs to face in my case toward DN side. This = was determined based on my power-pack's Serial Number printed on the = label by OILDYNE Co.

So I am back to square one, since I obviously will = continue to have my GEAR-UP problem, when I will put it back together = the way it was. Any suggestion would be very = appreciated.>>

Don't give up yet, there is more to the story.

When this problem first surfaced several years ago, = we determined that the build instructions for the pump were in = error.  I would not trust a reference by serial number because of = this.  Instead use the functional schematic from the Oildyne = website applied to our application.  To add to the confusion, note = that the labels in the schematic for up and down need to be = reversed.  The more typical application does work during extension = of the cylinder.  Our application reverses the high and low = pressure sides because our work stroke is during cylinder = retraction. 

The fool proof way to determine if the valve is in = backwards is to put a pressure gauge on the down circuit, even if = temporarily.  If the valve is in backwards, you will read several = hundred psi during a retraction sequence - enough to make the down = circuit think the gear is already in the down = position.    




TRV=3DThermal Relief Valve
HPRV=3DHigh Pressure Relief Valve
LPRV=3DLow Pressure Relief Valve




Hydraulic test stand  -  in this photo - = found a leaking, 'new' high pressure dump valve from Lancair (red = handle)



Highly recommend - Permanently installed hydraulic = pressure gauges


Chris Zavatson
N91CZ
360 std
www.N91CZ.com

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