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From: randy snarr <randylsnarr@yahoo.com>
Subject: Re: [LML] Re: LNC2 Hydraulic Gear Operation Fix
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I have been following this thread and have complained about many of the sam=
e issues. =0AI have the 235 set up with the oildyne pump from 1987 . I remo=
ved the original dump valve and replaced it with a Swageloc valve that has =
another port on it. I ran a poly line (no pressure) back to the resevoir. I=
 had the round metal resevoir and replaced it with a plastic one that I pur=
chased from Oildyne for about $45. I put a fitting into the to of the plast=
ic tank and the return line goes there. When my dump valve is opened in add=
ition to connecting the high and low sides together (still pressurized but =
equal) mine dumps pressure back to the resevoir taking pressure to 0.=0ANo =
more carrying a 9/16 wrench to crack a fitting so I can raise the gear. =0A=
The valve was about $60 if I recall. =0AThis does not solve the problem of =
the system building pressure when ambient temps go from cool to warm, but i=
t is a cheap solution that has worked for me...=0A=0ARandy Snarr=0A=0A=0A--=
- On Fri, 10/23/09, Sky2high@aol.com <Sky2high@aol.com> wrote:=0A=0A> From:=
 Sky2high@aol.com <Sky2high@aol.com>=0A> Subject: [LML] Re: LNC2 Hydraulic =
Gear Operation Fix=0A> To: lml@lancaironline.net=0A> Date: Friday, October =
23, 2009, 9:53 AM=0A> =0A> =0A>  =0A>  =0A> =0A> =0A> See=A0attached for gr=
eater understanding:=0A> =A0=0A> Grayhawk=0A> =0A> =A0=0A> In a message dat=
ed 10/23/2009 8:49:51 A.M. Central=0A> Daylight Time, =0A> rbelshe@comcast.=
net writes:=0A> Randy,=0A> I have spent too much time trying to analyze you=
r =0A>   hydraulic "fix".=A0 =0A> =0A> You say "The ONLY way to approach th=
is work =0A>   around for the Oildyne pump =0A> problem is to REMOVE the pr=
essure from the Lo =0A>   side. Relieving the expanding=0A> hydraulic fluid=
 and put it back in the =0A>   reservoir where it belongs!!!!=0A> This type=
 of "Fix" that simply bypasses the =0A>   open Lo sensor and does not =0A> =
relieve the expanding hydraulic fluid is =0A>   insane and it's a ticking t=
ime bomb=0A> for gear failure!!!"=0A> =0A> In fact, it =0A>   appears to me=
 that your circuit DOES bypass the open low=0A> pressure switch, =0A>   whi=
ch starts =0A> the pump and ADDS pressure to the low side.=A0 =0A> Then, =
=0A>   when the high pressure switch drops out, it immediately=0A> reverses=
 the=0A> pump =0A>   to restore the up pressure.=0A> =0A> If this analysis =
is incorrect, please let =0A>   the group know.=0A> =0A> Bob Belshe EE '61=
=0A> Lancair 235/320 900+ =0A>   hours=0A> =0A> PS:=A0 Why do you think so =
many Lancairs, including=0A> mine, have =0A>   never=0A> experienced this p=
roblem?=0A> =0A> =0A> -----Original =0A>   Message-----=0A> From: Lancair M=
ailing List [mailto:lml@lancaironline.net]=0A> On =0A>   Behalf Of Randy=0A=
> Sent: Monday, October 19, 2009 10:38 AM=0A> To: =0A>   lml@lancaironline.=
net=0A> Subject: [LML] Re: LNC2 Hydraulic Gear Operation =0A>   Fix=0A> =0A=
> This looks like a relay that when it senses the Hi pressure=0A> switch =
=0A>   being=0A> open, while the gear is up, shorts and closes the Lo=0A> p=
ressure =0A>   circuit. This=0A> will bypass the Lo pressure sensor when th=
e sensor opens=0A> from =0A>   the hydraulic=0A> fluid expanding. This type=
 of fix does not stop the=0A> hydraulic =0A>   fluid from=0A> expanding mor=
e and more as it heats up. The hydraulic fluid=0A> =0A>   expansion can=0A>=
 damage the hydraulic system. I have monitored this problem =0A>   and have=
 seen the=0A> Lo side exceed 2000 psi during this heat expansion in the =0A=
>   summer months.=0A> If this relay sticks the Lo sensor circuit will be o=
n all =0A>   the time=0A> regardless of the pressure sensor.=0A> The ONLY w=
ay to approach =0A>   this work around for the Oildyne pump problem is to=
=0A> REMOVE the pressure =0A>   from the Lo side. Relieving the expanding h=
ydraulic=0A> fluid and put it back =0A>   in the reservoir where it belongs=
!!!!=0A> This type of "Fix" that simply =0A>   bypasses the open Lo sensor =
and does not=0A> relieve the expanding hydraulic =0A>   fluid is insane and=
 it's a ticking time bomb=0A> for gear =0A>   failure!!!=0A> =0A> Randy Stu=
art=0A> LNC-2=0A> =0A> =0A> =0A> --=0A> For archives and =0A>   unsub =0A> =
http://mail.lancaironline.net:81/lists/lml/List.html=0A>  =0A> =0A> -----In=
line Attachment Follows-----=0A> =0A> --=0A> For archives and unsub http://=
mail.lancaironline.net:81/lists/lml/List.html=0A> =0A=0A=0A