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To: lml@lancaironline.net
Date: Sun, 22 Apr 2007 23:27:23 -0400
Message-ID: <redirect-1999284@logan.com>
From: Bryan Wullner <sbej@verizon.net>
Subject: Re: [LML] Gear Trouble
In-reply-to: <list-1996836@logan.com>
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References: <list-1996836@logan.com>

Greg Nelson,

Do you have an item list of everything you purchased and from where  
you purchased it? I am considering doing all my hyd. lines in  
stainless wrapped hoses.

Bryan


On Apr 20, 2007, at 8:47 PM, kneaded pleasures wrote:

> I now have a very different read on the causes of these gear  
> problems thanks to helpful comments from fellow Listers.
>
> Please recall that my gear trouble was that the nose gear had  
> retracted onto an already closed gear door.  A number of Listers  
> suggested it might be caused by "trash" in the hydraulic line which  
> could interrupt the ordinary flow of fluids and pressures.  Perhaps  
> this was true because I repeated the gear retraction onto a closed  
> nose gear door when on the jacks.  Still later (about 10 cycles of  
> the gear), a hose in the right wheel well burst causing total lose  
> of fluids and pressure while on the jacks.  Previous to this messy  
> event, I observed that the diameter of the 2000 psi hoses was  
> measurably larger than when unpressurized.  Further, the outside  
> rubber coverings of these 303-type hoses were badly cracked  
> revealing only a fiberglass reinforcement of the interior rubber  
> (or Teflon??).  In short, the hoses were shot and in need of  
> replacement.
>
> All hoses (14 total) now been replaced and I can announce that the  
> learning curve has again been confirmed here in Texas.  The first  
> hose took me about an hour and a lot of grunting to complete.  The  
> second took about 35 minutes and the last four which were blemish  
> free took only 9 to 12 minutes each.  The new 303 hoses are double  
> wrapped in SS mesh that render a 3000 psi rating.   New hoses, new  
> -4 fittings and, new hydraulic fluid all for a price under $300.
>
> My original hoses were installed in 1992.  If your 235, 320 or 360  
> is about the same age, consider replacing all fittings, hoses and  
> hydraulic fluid.  Doing so may avoid for you much of the gear  
> trouble we have recently been hearing about.
>
> Tips:  Use a long, tapered have-inch punch and cut the SS hoses  
> smoothly and cleanly with a Dremel tool metal cut-off wheel (not  
> mentioned by the manufacturer).
>
> Many thanks to those who helped me analyze this problem.
>
> Greg Nelson