Aren't these supposed to be a 3 or 4 pump jack? I bled the hydraulics per the instructions. It takes 7 pumps to fully raise it. If the hydraulic cylinder is left "open" it will come out the "air valve" if the handle is pumped.
i used mine all weekend on my pro-2, it isn't a bad jack for the bucks, and at 6 pumps to the top that isn't too bad either. not sure how you'd pick up 3000lbs with it because i was lifting half my truck(1700lbs) and a 180 lb guy had to put everything he had into it. i don't think i even bled mine, maybe one of my guys did it, this was the first time we used it. the aluminum was so nice i was thinking of buying another for when this one fails at the track(still cheaper than a top quality aluminum jack)
they dropped the price too, 170 bucks now, i think i paid 190.
I just swapped plugs and started to use it. you do have to use all of the throw to get it up it 6. maybe yours has a problem. They also have a new one with dual pumps. It is a 5 pump and can handle 2 tons.
Its now down to $149. Or the new 5 pump 2 ton for $299. A couple of guys at the track have them, it seems the handles loosen up and try to fall off (although that should be easily fixable with a wrench) and one of them had a broken stop that keeps the jack handle from going up too far...Curt