X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 24 Aug 2007 16:52:50 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m26.mx.aol.com ([64.12.137.7] verified) by logan.com (CommuniGate Pro SMTP 5.1.11) with ESMTP id 2282511 for lml@lancaironline.net; Fri, 24 Aug 2007 12:00:40 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.7; envelope-from=ETLTYT@aol.com Received: from ETLTYT@aol.com by imo-m26.mx.aol.com (mail_out_v38_r9.2.) id q.c60.18abac88 (14457) for ; Fri, 24 Aug 2007 11:59:50 -0400 (EDT) From: ETLTYT@aol.com X-Original-Message-ID: X-Original-Date: Fri, 24 Aug 2007 11:59:50 EDT Subject: Re: [LML] Re: LNC 2 Hydraulic Cylinder X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1187971190" X-Mailer: 9.0 SE for Windows sub 5041 X-Spam-Flag: NO -------------------------------1187971190 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Chris, I spoke with a man named George at Matco yesterday and while he was as helpful as possible he was not involved with the design or manufacturing of the hydraulics we use. George confirmed what I had been told by someone at Matco before that the locknut torque should be around 90 inch/Lbs. When I assembled the rod and piston and torqued the nut I found the torque sufficient to wrap a once flat AN washer around the shoulder of the rod and produce a beautifully conical washer. The mystery of the conical washers was solved. While 90 inch/Lbs is a normal torque for a 5/16 nut it is obviously way too high for this application.( Paul Nafziger, if you're reading this my apologies for the bad info when I sent you the sealing washers.) I reassembled the thing (with my last sealing washer-more on order just in case) using maybe 25-30 inch/Lbs and all looks good. Since the machined shoulder on the rod was a bit small I found the sealing washer was sitting on the threaded part of the shaft. This didn't bode well for a good seal. George suggested putting the sealing washer on the front of the piston. This required turning the piston around and swapping positions of the O-ring and nylon backup washer. So now the order of assembly is; Rod, AN washer, sealing washer, piston, a thin AN washer, Locknut. I used 5606 as the assembly lubricant but next time I'll try Vaseline. Gear trials begin today! Kai ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour -------------------------------1187971190 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Chris,

I spoke with a man named George at Matco yesterday and while= he=20 was as helpful as possible he was not involved with the design or manufactur= ing=20 of the hydraulics we use. George confirmed what I had been told by some= one=20 at Matco before that the locknut torque should be around 90 inch/Lbs. When I= =20 assembled the rod and piston and torqued the nut I found the torque sufficie= nt=20 to wrap a once flat AN washer around the shoulder of the rod and produce a=20 beautifully conical washer. The mystery of the conical washers was solved. W= hile=20 90 inch/Lbs is a normal torque for a 5/16 nut it is obviously way too high f= or=20 this application.( Paul Nafziger, if you're reading this my apologies for th= e=20 bad info when I sent you the sealing washers.)

I reassembled the thing (with my last sealing washer-more on order just= in=20 case) using maybe 25-30 inch/Lbs and all looks good.

Since the machined shoulder on the rod was a bit small I found th= e=20 sealing washer was sitting on the threaded part of the shaft. This didn't bo= de=20 well for a good seal. George suggested putting the sealing washer on the fro= nt=20 of the piston. This required turning the piston around and swapping position= s of=20 the O-ring and nylon backup washer. So now the order of assembly is; Rod, AN= =20 washer, sealing washer, piston, a thin AN washer, Locknut. I used 5606 as th= e=20 assembly lubricant but next time I'll try Vaseline.

Gear trials begin=20 today! &nbs= p; =20 Kai

Get a sneak peek of th= e all-new AOL.com.

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