REFLECTOR: Landing Gear Pump Not Holding Pressure

Darrell & Nora Kufalk kufalk at wi.rr.com
Sun Jan 6 17:20:46 CST 2013


I didn't explain that very well.  The switches were still connected.  I
capped the 2 lines going through canard bulkhead and I have the mechanical
door actuator.  The switches are working correctly.  As soon as the pump
stops, the pressure bleeds off somehow.



-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Carl Hoffman
Sent: Sunday, January 06, 2013 3:53 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Landing Gear Pump Not Holding Pressure

Something is not making sense here. If both outlet tubes are capped off,
where are the pressure switches that would cause the pump to cycle?
One of the outlets is for the up side, and the other is for the down side.
Maybe you just have a faulty down side pressure switch somewhere causing it.
Over the past 12 1/2 years I've replaced mine twice.


On 1/6/2013 3:10 PM, Darrell & Nora Kufalk wrote:
> I was testing my landing gear on jack stands and gear pump began 
> cycling every few seconds.  It would only do it in the down position.  
> I traced it down to the pump itself.  With both outlet tubes caped off 
> it still cycles once or twice per second.  I pulled the pump out and
removed the reservoir.
> I took apart what looks like 2 check valves and they look ok to me.  
> I'm not sure what to do next.
>
> Anyone else have a problem like this?
>
> Darrell Kufalk
>
>
>
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