HWH leveling jacks

[Gardner Yeaw]

I plan to call HWH, but maybe I can get the answer here.
My jacks have worked perfectly and this weekend I used them twice. The
third time the right rear jack would not drop down. It would move a
little, but stop. I noticed that the jack was extended about 2 inches.
I tried several times but no good. When i packed up and retracted the
rest of the jacks I noticed the 'bad' jack was retracted. I suspect it
will work now, but don't want to take the chance that it would deploy
and not retract.

How does the jack actually work. I understand that there is a
system for lowering the jack assembly and another for extending the
shaft to raise the coach. Is this how it works?

Gardner
78FC33 (emulating a flamingo at this moment)