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FYI, I had same problem. I went to the local Ace
Hardware, found the same made in China valve $14.00.
Cured the problem. It is the same valve that came
in the kit from Lancair. It is only rated for 600 PSI. I also checked the parker
valves and have the same PSI rating. This should get some response on the
list.
" EXPERIMENTAL"
Bucky
----- Original Message -----
Sent: Tuesday, March 27, 2012 8:32
PM
Subject: [LML] LNC2 gear diagnosis
If any of you
have a suggestion, I’d appreciate your
input.
On my last
flight home, with no early signs of failure, my gear pump was tripping on
about every 2 seconds to maintain pressure. I figured I had a leaky actuator and
would have to rebuild it to resolve this; no big deal. I found one leaking and figured where
there is one, there may be more.
So, I’m rebuilding all of them.
But, before doing so, I put a gauge on the high pressure side of the
pump to see if I had internal leaks there too. What I found was that my pump will
only pressurize to about 950 psi (should be ~1200 psi) and then it bleeds down
slowly. I tried to adjust the
pressure switch but it made very little difference. To verify the bleeding, I isolated all
actuators out of the system except the nose wheel. I put the gauge on the high pressure
side of the NW actuator line, selected gear up to pressurize the system, and
then quickly crawled under the plane to look at the gauge. It was bleeding down so fast that by
the time I got down there to look at it (~2 sec.), it had already lost about
200 psi and then bled down the rest of the way in about 7 more seconds. So, and here’s the question, do I have
a faulty gear dump valve, a leaky pump, or
both?
Danny
LNC2-360,
~550 hours
N
38° 43' 25.7"
W
77° 30' 38.6"
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