leveling jack question

[guysmalley]

Hi
I crack a fitting that goes into the top of the rear leveling jack, ( do ask it
is a long story)
i removed the bad fitting. got a new one my question is do i fill the jack with
fluid or how do I
bleed the air out? or do I ?
if you are wondering I had a peice of railroad tie I have used for over a year
to dispurse the
weight & the dam thing split sending the jack forward! what a noise glad I
wasn't under the
bird,,, another lesson learned

-guy smalley
86 pt 40