Quote:
Originally Posted by Scudrunner
Having a similar issue 1974 337G, if I pump the gear doors down on my preflight the gear will cycle normally.
Plane had sat for past two months with the cold weather.
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You may have a couple of related issues.
First, it sat for a couple of months, so it "lost it's prime", for lack of a better term. By this, I mean, the fluid leaked down from where it usually sits with pressure. By you pumping the doors open, ( I would suspect quite a few pumps until you felt the pressure come up), you pressurized the system.
This is an internal electro/hyd. pump/reservoir issue.
When was it last rebuilt? Or is it original equipment/?
Second, When were the door and gear solenoids serviced?
(I would also bet, if you really thought about it, a few months back.. the doors were open after landing, and parking. They came up after master off, and then master back on....You didn't think anymore about it.)
The solenoids get sticky, and if they get hot, they really stick. They need be serviced at least at annual, I serviced mine when ever the center console cover came off, or when I was at the hangar and wanted something to do.
The hyd pump / reservoir leak down issue can only be fixed permantly by a rebuild, or you can just pump up the pressure each time before you fly.
Also, check the reservoir fluid prior to first flight of the day, at least.
Good luck.