This was left in a building I purchased. I cannot get it to raise but have no clue if I am attempting to operate it correctly. There is a lever at the top and one at the bottom. The closest thing I can find online is a 2 ton Milwaukee post jack. I can't read the label plates on the jack, so that's no help. The entire top comes off. If I can get it to work, I'd probably keep it, I hate to put it in the scrap pile.