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From: RWolf99@aol.com
Message-ID: <0.3759d046.253f346e@aol.com>
Date: Wed, 20 Oct 1999 11:06:22 EDT
Subject: Hydraulic Cylinder Stops
To: lancair.list@olsusa.com
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>>
In a message dated 10/20/99 1:24:40 AM, you wrote:

<<it must be checked and set with the system
operational, because the cylinder end cap will shift slightly under actual
load.   >>

I must agree strongly with this statement.  I was surprised to discover that 
my carefully adjusted main and nose gear hydraulic cylinders -- adjusted when 
there was no fluid in the system -- was no longer adjusted when I filled the 
system and pressurized it with the pump.  The hydraulic pressure moves the 
cylinder to a different position that is achieved with merely one's bare 
hands, even though it feels "bottomed out".

Properly adjusted hydraulic cylinders are a must.  Fortunately, it's easy to 
do.  I pressurize the system -- either gear down or gear up -- leave the 
pressure on, and make sure I can easily drop the connecting bolt thru the rod 
end bearing.  If you can't, there's gonna be a significant load on the 
mounting points.  (Envision hammering the attachment point until you can drop 
the bolt thru.  Those are the same loads you're applying if you dump the 
pressure, insert the bolt, and repressurize it.)

As to whether this has caused the mounting blocks of the subject SB to 
debond, I have no opinion.

- Rob Wolf

[The adjustments will probably need to be fiddled with in both directions
to get the exact positioning of the gear that allows the o/c links to lock
the gear down and the proper spacer lengths under the rod ends to achieve
full gear up without hitting the wingskins (mains) or draglink (nose).
Needless to say, both directions should be adjusted with normal operating
hydraulic pressure applied.      

<Marv>     ] 

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