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Bill,
I have this problem chronically when the aircraft sits for a while with a low (not full) hydraulic quantity. It’s always on the first retraction cycle after a few days of sitting. I have a pair of gear door actuators that weep a little while they sit. I believe this is causing the system to lose its prime. When the gear is cycled up there are certain positions on the sequencing valve that will time out if there’s not enough pressure. I believe this is what’s happening in my case and resetting the selector resets the timer and allows the pumps to finish priming the system and complete the cycle. This annual I plan to rebuild the actuators, but in the mean time the key is to top off the hyd quantity periodically. Also with my system I don’t need to cycle the gear, just take the gear lever to the idle position for a five count then back to the up position and the cycle will complete!
_travis
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