Mailing List lml@lancaironline.net Message #61035
From: Christian Meier <lancair@meier.cc>
Sender: <marv@lancaironline.net>
Subject: Re: [LML] hydraulic pump servicing
Date: Sun, 12 Feb 2012 11:33:58 -0500
To: <lml@lancaironline.net>
Chris,

I tried to get a poppet valve from Oildyne in Austria. They told me that they wont sell it because it is an Aircraft part. It will be sold only in a special "priced" kit :-((

As my pump is from 97 I will soon change the O rings. Should I change every single O ring, or just the one on the spool. Does the poppet need to be changed?
My pump works well. There is only a small internal leak on the low pressure side.
I have the asymmetric spool and no springs installed. I upgraded to the -32 pump-gear. 

Christian





Am 12.02.2012 upm 02:50 schrieb Chris Zavatson:

Jack,
Ouch! That hurts to hear about the rebuild kits getting so expensive.  The good news: The only critical part in the kit is the poppet valve, so you only need a kit if the poppet valve is leaking.
The O-ring designations I provided are the industry designation:
013N90
014N90
908
These are for the hex plugs, poppet valve bodies, and spool.
 
Chris Zavatson
N91CZ
360std
 

From: "marv@lancair.net" <marv@lancair.net>
To: lml@yahoo.com
Sent: Friday, February 10, 2012 7:26 AM
Subject: [LML] Re: hydraulic pump servicing


Posted for JON ADDISON <jraddison@msn.com>:

 
 Chris
 The Parker pump kit (634412) went from $60 to now $123.  In a direct email to
me you indicated the o-rings of interest are 013N90, 014N90 and 908 durometer
90 (from McMaster) Thought I'd try and share that info with the rest.
 It appears a blackish seepage is emanating from the top of the pump itself
and running down the side of the pump into the reservoir. I haven't
investigated it yet by taking it off the adapter.
 Also, been looking at gages.  So far 1 1/4 inch is the smallest and
electric/sensor driven.  Hydraulic driven directly at that size only goes to
2000psi and only good for 115% over pressure.   It appears to me that with
over temps driving, we would best have at least 3000psi capability.   What
have others found??   Also, if hydraulic-direct gage is used with a 3 foot
line will the air purge itself out since there is no return line??
 Jack Addison360JS
 
 

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