REFLECTOR: HYDRAULIC PUMP

[Laurence Coen]

I'm talking about the emergency gear down handle.  The dump valve shaft 
passes through a hex fitting much like you find on a sink faucet.  I 
tightened it about 1/4 turn and now my gear will stay up for 24 hours 
without cycling.

Larry Coen
  ----- Original Message ----- 
  From: Tom Martino
  To: Velocity Aircraft Owners and Builders list
  Sent: Sunday, July 16, 2006 9:24 PM
  Subject: Re: REFLECTOR: HYDRAULIC PUMP



  Could you elaborate?  I am not sure what you are calling the "handle" . 
and what a packing gland is . sorry.



  -----Original Message-----
  From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On 
Behalf Of Laurence Coen
  Sent: Sunday, July 16, 2006 5:43 PM
  To: Velocity Aircraft Owners and Builders list
  Subject: Re: REFLECTOR: HYDRAULIC PUMP



  Tom,



  There is a packing gland nut hiding under the handle.  Try giving it a 1/4 
turn before replacing the whole works.  It solved my problem.



  Larry Coen

  N136LC

  SE/RG Franklin/IVO

    ----- Original Message ----- 

    From: Tom Martino

    To: reflector at tvbf.org

    Sent: Sunday, July 16, 2006 3:14 PM

    Subject: REFLECTOR: HYDRAULIC PUMP



    BACKGROUND:  This query comes as a result of my hydraulic pump turning 
on and off quickly when gear was retracted.  A gear retraction test revealed 
that the system is not holding pressure.

    QUESTION:  Can anyone tell me the actual Manufacturer, model and part 
number for our Hydraulic Pumps? (I realize I can get them from Velocity, but 
I am curious about some other things and would like to contact the 
manufacturer.)

    Also . I am told there are "rebuild" kits for them.  I know the rebuild 
kit includes "o" rings . but they are for keeping the fluid from leaking to 
the outside world.

    My pump (and plumbing) had absolutely NO LEAKS - anywhere.

    The only conclusion I could make is that the pressure was "bleeding off" 
from the high side to the low side and the only parts in the pump that 
maintain internal pressure are the "spring loaded metal-seated cone 
check-valves" (one on each side).

    Do the rebuild kits include new springs and cones?

    Also . has anyone ever had the "dump valve" leak internally from high to 
low side?  Without showing any wear or exterior leaking?  A local hydraulic 
shop tells me they hardly ever see those simple quarter-turn vales go bad.

    Any help on any of this would be great!

    Tom


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