I will only be lifting about a 100kg with the rotary table, mounting plate and chuck,
but thought I would rate it at 500kg like the hoist. It is capable of more but I wont be lifting that much. Also I doubt the Chinese hoist would lift 500kg anyway. I would need to put my manual chain block on for that sort of weight.
Any heavy lifting is done off the shed trusses. My father in-law, who has passed now, was a chief draftsman at the mines and designed them to be capable of lifting 3 tons.
One tip is when building a crane like this is, you have to allow for flex. Instead of the crane being square it's opened up about 5mm in 2400mm too allow for the flex when loaded as it will bring it down to be level. I picked that one up off one of the manufactures web sites.