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Date: Mon, 23 Jun 2014 08:28:51 -0400
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Subject: Re: [LML] Bleeding the hydraulic system
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From: Kyrilian Dyer <kyrilian_av@yahoo.com>
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John,
Perhaps the pressure gages themselves are causing the problem. I was plannin=
g to do exactly as you are, but was worried that the short lines running to t=
he pressure gages would always retain some air, which would make the system s=
quishy. I haven't decided whether to use them or not (I'm not as far as you)=
 but would be curious what you find.
- Kyrilian
Legacy build


> On Jun 23, 2014, at 7:22 AM, John Cooper <snopercod@comporium.net> wrote:
>=20
> 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>

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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>John,</div><div>Perhaps the pressure gages themselves are causing the problem. I was planning to do exactly as you are, but was worried that the short lines running to the pressure gages would always retain some air, which would make the system squishy. I haven't decided whether to use them or not (I'm not as far as you) but would be curious what you find.</div><div>- Kyrilian</div><div>Legacy build<br><br></div><div><br>On Jun 23, 2014, at 7:22 AM, John Cooper &lt;<a href="mailto:snopercod@comporium.net">snopercod@comporium.net</a>&gt; wrote:<br><br></div><blockquote type="cite"><div>
  

    <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
  
  
    I finished installing the new hydraulic pressure gauges a couple
    days ago and 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, but there's still air in the system.
    When I open the dump valve, I can hear the air and fluid mix surging
    through the lines. I've filled the pump reservoir several times, but
    the gear still isn't coming up or down solidly. I can only do so
    many cycles at a time without burning up the pump motor so after two
    days the action is getting a little better, but not even close to
    being right. Today I cycled the gear switch down and all three went
    down, but the pump kept running and the new LP pressure gauge read
    zero the entire time. Cycling the gear up only moves one of the
    mains partway up and the pump keeps running again and the HP gauge
    reads zero.<br>
    <br>
    With one of the mains blocked in the up position with a stick, I
    could manually push the other main open and closed <u>with the dump
      valve closed</u>. That certainly 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.<br>
    <br>
    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 it would have to be a massive leak, I think. I
    could also isolate <u>all three</u> gear and see if the pump,
    pressure switches, and my new pressure gauges are&nbsp; working. Anybody
    have any ideas?<br>
    <br>
    Here's a photo of the final installation of the pressure gauges in
    the center console:<br>
    <br>
    &lt;Transformed_Lancair pressure gauge installation 004.JPG&gt;<br>
  

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