REFLECTOR: Hydraulic Pump Leak..fluid levels

[Scott Derrick]

Jeff,

Your completely right.  The change in fluid level is negligible between up 
and down.  I tested that before I ever flew the plane.

My fluid level is at about 2/3 's and in moderate turbulence it leaks like 
a sieve.  Its leaking from the reservoir to pump seal, not the cap.

Or it was leaking,  I'm going to replace the sillycone that somebody 
added(I've been told by three people this is the fix) to stop the leak.

My question is,  is there a "best" sealer for hydraulic systems?  RTV, the 
black sticky stuff?

Scott

At 06:19 PM 12/13/2004, you wrote:
>Does the hydraulic fluid level change THAT much between 'up' and 'down' 
>cycles?  I would think that the amount of driving (extending) fluid would 
>nearly equal the fluid driven out of the cyclinders and returned back to 
>the reservoir and same for the retraction cycle(once all the air bubbles 
>are out of the system and it is in 'steady state') .. JEFF C.
>
>johnward wrote:
>
>>Also shouldn't the fluid level be determined during the drop check when the
>>gear is retracted?  I believe the reservoir might be overfilled when the
>>hydraulic piston is retracted in the cylinder if it's filled on the extend
>>cycle.
>>
>>John Ward
>>----- Original Message ----- From: "Pat Shea" <xl340hp at yahoo.com>
>>To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>>Sent: Monday, December 13, 2004 5:42 PM
>>Subject: Re: REFLECTOR: Hydraulic Pump Leak
>>
>>
>>
>>
>>>Okay, I obviously should have thought that thru before
>>>posting...
>>>
>>>I recall someone dealing with leaking cap in the past
>>>& was curious how they dealt with it since mine is
>>>leaking some from just ground ops. Agreed, if the cap
>>>is the only vent source, you're gonna need it! One
>>>thought was to raise the vent opening further from the
>>>fluid level (i.e. seal the cap slots and use a vent
>>>tube stemming from the cap). Ronnie, since you're
>>>flying and don't seem to have any problems, maybe
>>>running with the reservoir only 1/2 full is the
>>>ticket! I'll try that first...
>>>
>>>Thanks, Pat
>>>
>>>
>>>
>>>>The vents really need to be left open.  You can see
>>>>the fluid go up and down in the reservoir as the gear
>>>>is retracted and extended.  The difference is the
>>>>piston rods that displace fluid as they go into the
>>>>cylinders. I agree, seal the vents and you could have
>>>>a real mess!
>>>>
>>>
>>>
>>>
>>>
>>>
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>>
>>
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