REFLECTOR: Main gear not locking on dump

[Tom Cacek]

You mentioned getting leaks stopped. ?Could the rear fitting on the ram been over tightened and is bottoming out causing a restriction of flow (bleed down/dump) or distorting the cylinder causing binding of the piston or the shaft at that end?

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-----Original Message-----
From: Phil Hooper <phil at hdmnet.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Wed, Jul 31, 2013 08:37 PM
Subject: REFLECTOR: Main gear not locking on dump




Dear collective, slow building Hooper here.? 

I have a bit of a challenge with the main gear.? Everything works fine, full lock when hydraulic-driven.? When we test the dump valve release, the gear goes down, but stops just short of lock.? Scott Swing thought it might be a weak spring and sent me the strongest he had...same problem.? There is no drag whatsover on the main gear bolt, nor in the gear pocket sleeves.? It all moves freely and will lock every time when hand dropped slowly from both sides, but with no cables attached.? There is also plenty of slack in the cables when using hydraulics, probably too much at this point.? 



We have found that by giving a manual nudge, pulling the ram out about another 1/2" out, bam, it locks.? So the problem points to the ram having resistance to coming out to the end of it's travel as the weight of the gear pulls the cables, and thus the ram. 



Scott speculated that the ram might loosen up with time, but so far, it shows no signs of yielding.? I wonder if the seals are too old (about 11 years) and if the cylinder should be rebuilt...ugh, just when we got all the leaks cleared and cleaned up the last of the spilled fluid.



I wonder if any of you fine folks have had a similar problem and how you solved it.? One interesting thing we tested was adding two and half pounds of weight to the center of the mechanism...presto, down it came, and locked.? I have also thought about adding a downward pulling spring without 5 pounds of force, or an emergency cable connection that would pull the overcenter down into lock (parts to break).? The easiest solution may be g-forces if I'm ever alone and it won't lock, but I don't know if I can trust that.



What say you, and thanks to any and all with wisdom superior to mine.? Blessings to all.? 

Phil

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Phil Hooper
President



        Harvest Development
          & Media Inc.

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            email: phil at hdmnet.com
        







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