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Byron -

I don't really know your system so I can't be specific but you might
consider capping off each or all the actuator lines and see if the pump
"chirps". If it does, seems to me you have an internal leak in the pump.

I had a similar problem in a Seneca III years ago. It used hydraulic
pressure from an electrically powered hydraulic power pack to hold the gear
in the up position. I'd fly along and see the ammeter spike every so often.
It was the pump motor flipping on for a second and building up pressure.
Turned out it was the emergency down valve. The valve is designed to
relieve pressure in the system and allow the gear to free fall to the down
and locked position.

Good Luck,

Ted Stanley

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