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Subject:  Hydraulic pump cycling / Replacing dump valve/ UPDATE
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From: Erik Larson <asw20747@aol.com>
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This is a multi-part message in MIME format.
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First.... thanks to Danny, Skyhawk, Andy and anyone else that responded to =
our hydraulic pump cycling issue. =20


We took your collective advise, isolated each cylinder, then the pump and f=
inally the DDV (Dumb Dump Valve) and like Danny said.... it WAS to be found=
 in the.....Dumb Dump Valve.


Changing the valve was VERY difficult.... the only access was blind, with n=
o less than 5 connections that had to be clocked precisely to mate up again=
 with the hard lines.  The thought of upgrading to a "High Quality" valve w=
as considered, but if it wasn't the exact same dimensions, the hard plumbin=
g would have to be changed....we'll save that project for another day....or=
 year.


Thanks again for the help..... my only advice to anyone else with these sym=
ptoms..... G.D.V.E. =3D Go Dump Valve Early!



Erik Larson
Legacy/N74FX









I have a Legacy, 6 1/2 years, appx 650 hours, we started experiencing momen=
tary hydraulic pump cycling averaging now every 6-8 minutes for a micro sec=
ond.


It's time to start trouble shooting to find the leaky bypass and following =
some previous postings on the issue, it seems that the best place to start =
may be the dump valve, then the cylinders and finally the pump.


At first glance it looks like getting the dump valve changed out could be q=
uite a job.  Anyone that's done it recently care to share some Helpful Hint=
s?


It looks like the only way to get to it, is by disassembling the throttle q=
uadrant, even then it looks tight?


Thanks for any advise you may have.


Erik Larson
Legacy/N74FX


----------MB_8D0435298B9653D_E90_FD46B_webmail-d288.sysops.aol.com
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset="us-ascii"

<font color=3D'black' size=3D'2' face=3D'arial'>First.... thanks to Danny, =
Skyhawk, Andy and anyone else that responded to our hydraulic pump cycling =
issue. &nbsp;
<div><br>
</div>

<div>We took your collective advise, isolated each cylinder, then the pump =
and finally the DDV (Dumb Dump Valve) and like Danny said.... it WAS to be =
found in the.....<i>Dumb Dump Valve</i>.</div>

<div><br>
</div>

<div>Changing the valve was VERY difficult.... the only access was blind, w=
ith no less than 5 connections that had to be clocked precisely to mate up =
again with the hard lines. &nbsp;The thought of upgrading to a "High Qualit=
y" valve was considered, but if it wasn't the exact same dimensions, the ha=
rd plumbing would have to be changed....we'll save that project for another=
 day....or year.</div>

<div><br>
</div>

<div>Thanks again for the help..... my only advice to anyone else with thes=
e symptoms..... G.D.V.E. =3D Go Dump Valve Early!</div>

<div><br>
</div>

<div>
<div style=3D"font-size: small; background-color: rgb(255, 255, 255);">Erik=
 Larson</div>

<div style=3D"font-size: small; background-color: rgb(255, 255, 255);">Lega=
cy/N74FX</div>
</div>

<div><br>
</div>

<div><br>
<br>
<br>

<div style=3D"font-family:helvetica,arial;font-size:10pt;color:black"><br>




<div id=3D"AOLMsgPart_1_0a8ebc85-b190-410a-99ad-7a3a1e7e6b83">
<font color=3D"black" size=3D"2" face=3D"arial">

<div style=3D"font-size: small; background-color: rgb(255, 255, 255);">I ha=
ve a Legacy, 6 1/2 years, appx 650 hours, we started experiencing momentary=
 hydraulic pump cycling averaging now every 6-8 minutes for a micro second.=
</div>



<div style=3D"font-size: small; background-color: rgb(255, 255, 255);"><br>

</div>



<div style=3D"font-size: small; background-color: rgb(255, 255, 255);">It's=
 time to start trouble shooting to find the leaky bypass and following some=
 previous postings on the issue, it seems that the best place to start may =
be the dump valve, then the cylinders and finally the pump.</div>



<div style=3D"font-size: small; background-color: rgb(255, 255, 255);"><br>

</div>



<div style=3D"font-size: small; background-color: rgb(255, 255, 255);">At f=
irst glance it looks like getting the dump valve changed out could be quite=
 a job. &nbsp;Anyone that's done it recently care to share some Helpful Hin=
ts?</div>



<div style=3D"font-size: small; background-color: rgb(255, 255, 255);"><br>

</div>



<div style=3D"font-size: small; background-color: rgb(255, 255, 255);">It l=
ooks like the only way to get to it, is by disassembling the throttle quadr=
ant, even then it looks tight?</div>



<div style=3D"font-size: small; background-color: rgb(255, 255, 255);"><br>

</div>



<div style=3D"font-size: small; background-color: rgb(255, 255, 255);">Than=
ks for any advise you may have.</div>



<div style=3D"font-size: small; background-color: rgb(255, 255, 255);"><br>

</div>



<div style=3D"font-size: small; background-color: rgb(255, 255, 255);">Erik=
 Larson</div>



<div style=3D"font-size: small; background-color: rgb(255, 255, 255);">Lega=
cy/N74FX</div>

</font>
</div>




</div>
</div>
</font>
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