You asked if the bed should be up or down when filling the hoist with fluid. Looks like you already filled it, so this reply might be moot at this point.
I was going to say that on some hoists, you need to have it partway up to get at the filler plug. But if you overfill it in that position, it's possible to blow out the seals when you let it back down. So a good idea is to fill it, then let the box down first with the plug still out, so any excess fluid can come out. Then raise it again, put the plug back in, and you're good to go.
