Message-Id: <5.0.0.25.2.20020411164409.00ae14d8@pop3.olsusa.com>
Date: Thu, 11 Apr 2002 16:53:48 -0400
To: lancair.list@olsusa.com
From: Paul Kapcin <pkapcin@olsusa.com>
Subject: 320 MKII hydraulic pump "clunk, clunk clunk" noise
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REPOSTED FOR Matt Reeves <mattreeves@yahoo.com>


Hello everyone.
     This is a new install, first time run, on a Lancair 320 MKII, ground 
test. I'm hoping someone who is smarter than me can shed some light on a 
little problem I am having.  I have the new style pump.  I blew out all the 
lines with compressed air, filled the fluid with 5606G, jacked up the 
plane, and fired up the pump.  As soon as I connected the pump, I heard 
exactly this, "clunk, clunk clunk"  just like a hammer tapping fast on the 
pump.  In the gear downmode it is slightly faster and louder.  NO fluid 
moves in the lines.  Since this is a first time
  run, is this some type of plug I forgot to remove on the pump 
itself?  Could this mean my pressure switches are backwards?  Someone wrote 
on the high and low and as far as the writing goes, it is installed 
correctly.  I did check the wiring and it seems to be fine.  I did not 
install the transition light for this initial test.  Could that be the 
problem since it is connected to both high and low relays? Has anyone ever 
had this happen to them?  What did you do about it?

             By the way, it is "clunk, clunk clunk" just like that.  I did 
write to Parker co and here is their    response.  I would rather not go 
tearing the pump apart if it is just something simple I am overlooking.  I 
really appreciate all of your help!!!  P.S.  Why would my coupling be 
broken on a  brand new motor?
  Thanks, Matt Reeves

  Response from Parker.

  Matt: thank you for your message.

You have me baffled by the description of the sounds you are hearing!  I'm 
not sure what could be causing it but you could try removing the electric 
motor from the power unit and see if there is a problem with the 
coupling.If the coupling, which goes between the motor shaft tang and the 
pump shaft  tang, is broken that could be the culprit.  Attached are two 
files - one is a generic exploded view drawing, the other the startup and 
priming instructions.  With the motor off the power unit you could energize 
it and make sure the motor is running properly in both rotations.  If the 
motor and coupling are in good shape, reinstall the coupling back down onto 
the pump shaft (the small slot end goes toward the pump shaft) and, using a 
flat blade screwdriver, make sure the pump shaft will turn in both directions.

             Let me know what you find after this troubleshooting and we'll 
try to determine where to go next.  The pressure switches are not supplied 
by Oildyne but even if the pressure switch failed it shouldn't cause any 
type of mechanical noise like you are hearing.

       With the Oildyne power unit it is critical to follow the priming and 
startup instructions.  If the second port of the power unit is not plugged 
off (your finger will do) it will pull air into the pump and prevent you
from pulling oil from the tank to pump out the first port.
Regards,
Bryan Anderson
Oildyne Division
Product Manager

:


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