REFLECTOR: HYDRAULIC PUMP

Tom Martino tmartino at troubleshooter.com
Sun Jul 16 21:24:05 CDT 2006


  
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 <mailto:tmartino at troubleshooter.com>  
	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turning on and off quickly when gear was retracted.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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