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From: "bobjude" <bobjude@gateway.net>
To: "Lancair Mail List" <lancair.list@olsusa.com>
Subject: LNC2 Gear Hydraulics
Date: Sun, 20 Jun 1999 01:04:36 -0500
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          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> 
>>
N65BJ is flying again after a full year of repairs following a hanger
collapse.  HOW SWEET IT IS! to be back in the air again.

I have a problem now that I sure at least one of you flyers out there can
give me the answer to.  With the gear switch in the Down position and the
gear breaker On, the hydraulic pump cycles On and Off intermittently.  I
have tried all the easy fixes without success.  The fluid level is high.  I
have had the bird on jacks and cycled the gear up and down at least ten
times.  Occasionally, the problem will seem to go away and everything will
be normal until I taxi out for take-off.  The On-Off cycling will then start
again.  I know that some of you have had problems with the dump valve
leaking but I don't think that this is my problem because with the gear in
the Up position there is no unwanted cycling.  I tried adjusting the low
pressure switch to a higher pressure today.  That only seemed to make the
problem worse.  Where the cycling was at 2 minute intervals, now it's about
30 seconds.  If I had a pressure gage with the required range I could plumb
it on to low pressure hydraulics and see if the pressure is actually droping
during the cycling interval or if the pressure switch is intermittent.  If
the pressure is droping, it looks like I'm in for a new hydraulic pump.
Does anyone know a good source for pressure gages?  Has anyone had this
problem before?

Bob Jude
N65BJ


[Reprinted from LML, 12/7/98:  "I found a company in Addison, IL called Kodiak
Controls who has 1000 and 2000 psi gages, 1-1/2" diameter, white face with
black numbering, all stainless steel with a u-clamp and a rear center
1/8npt fitting for $21.70/ea.  The part numbers are 7217U-1.5-8-1000 and
7217U-1.5-8-2000.  You can reach them at 630-629-3733."

The gages are a bit more expensive now, around $25 if memory serves, but
they're really nice and should do the job.  (I've got a pair for my project.

       <Marv>      ]
 

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LML homepage:   http://www.olsusa.com/Users/Mkaye/maillist.html