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Date: Tue, 15 Nov 2011 10:43:02 -0500
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From: "Planemakers, Inc." <planemakers@planemakers.com>
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Subject: Re: Legacy Hyd pump question
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Hi Paul,

Our Seawinds have a similar system to yours and the primary cause of 
momentary, unusual hydraulic system cycling for us is fluid leaking from one 
side of the cylinder to the other either around the seal on the piston or 
through roughly cut or loosening threads where the piston attaches to the 
push rod in the cylinder.  A way to figure out which cylinder/s is/are the 
problem is to get the correct size plugs for the lines and isolate each 
cylinder on the system and see which one keeps cycling.  Sometimes it has 
been more than one so I like to unhook and plug up all but one cylinder at a 
time and check them all individually for internal leaking.   But, first I 
like to unhook them all, plug all the lines and check the system without any 
cylinders hooked to it.  If you do this and you still have the cycling then 
the problem is somewhere other than the cylinders.

I hope this helps and have a great day,

John J
www.planemakers.com


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From: "paul miller" <paul@tbm700.com>
Sent: Monday, November 14, 2011 7:44 AM
To: <lml@lancaironline.net>
Subject: Legacy Hyd pump question

> I have a 2004 vintage Legacy and the heat soak issue is common with my 
> pump (I use the dump valve).   Recently, sitting on the ramp with no 
> engine running, I now can hear short pump cycles every few minutes.  There 
> are no obvious leaks but a few drops of hydraulic fluid are on the nose 
> actuator so I suppose this could cause a pump actuation if there is a 
> small leak.  I suppose it could be the dump valve also.
>
> My question is what process would you suggest for targeting this thing 
> before it gets worse.  Whatever testing stuff I need I can get locally 
> here at the airport.  I see the oildyne schematics in the archives and all 
> the comments on spool valves, fixes and electronic upgrades so I have all 
> that as a reference.  Thanks.
>
> Paul
> Legacy, Spruce Creek.