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Date: Mon, 23 Jun 2014 19:28:53 -0400
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Subject: Re: [LML] Bleeding the hydraulic system
References: <list-6946157@logan.com>
From: Chris Zavatston <chris_zavatson@yahoo.com>
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John,
Despite the fact that all of our lines 'dead end', the system is self bleedi=
ng and usually self priming.  Technically the Oildyne instructions for primi=
ng call for blocking off the return line so that fluid is drawn from the res=
ervoir rather than air from the return line.
It generally takes several (5-10) cycles to get all the air out of a complet=
ely dry system.  Trapped air will go into solution under pressure and then b=
e released again when the system is depressurized. Eventually all the air is=
 released via the reservoir.

Chris Zavatson
N91CZ
360std
www.N91CZ.net

Sent from my spiffy iPhone

On Jun 23, 2014, at 4:22 AM, John Cooper <snopercod@comporium.net> wrote:

> I finished installing the new hydraulic pressure gauges a couple days ago a=
nd have been trying to bleed the air out of the system ever since. I cracked=
 all the fittings at the main cylinders and bled out some strawberry fizz, b=
ut there's still air in the system. When I open the dump valve, I can hear t=
he air and fluid mix surging through the lines. I've filled the pump reservo=
ir several times, but the gear still isn't coming up or down solidly. I can o=
nly do so many cycles at a time without burning up the pump motor so after t=
wo days the action is getting a little better, but not even close to being r=
ight. Today I cycled the gear switch down and all three went down, but the p=
ump kept running and the new LP pressure gauge read zero the entire time. Cy=
cling the gear up only moves one of the mains partway up and the pump keeps r=
unning again and the HP gauge reads zero.
>=20
> With one of the mains blocked in the up position with a stick, I could man=
ually push the other main open and closed with the dump valve closed. That c=
ertainly doesn't seem right. (The nose gear didn't move during that exercise=
). I don't remember it being so hard to bleed the hydraulic system the first=
 time I did it.
>=20
> Or maybe something else is wrong? I guess I could isolate the gear one at a=
 time to make sure a cylinder isn't leaking through at the piston seal, but i=
t would have to be a massive leak, I think. I could also isolate all three g=
ear and see if the pump, pressure switches, and my new pressure gauges are  w=
orking. Anybody have any ideas?
>=20
> Here's a photo of the final installation of the pressure gauges in the cen=
ter console:
>=20
> <Transformed_Lancair pressure gauge installation 004.JPG>