Gear Failure

[Skymaster337B]

I believe in order for the gear doors to close after the gear is up, that not only do all gear have to be in the uplocked position; but then the shuttle valve drops the hyd press down to close the doors. So if the doors didn't close and the gear really locked in the up position, then I'd say you might have shuttle valve issues.
In which case the pump will run at the higher pressure for as long as it takes to overheat the electrical pump...causing a breaker to pop.

So when you pulled the handle, it may have hydraulically jarred a shuttle valve so that it would move normally again.