Looking at my 1:50 model it appears that the two hoist ropes attach to the hoist drums (One continuous Rope) for each side. The two sheaves on the dipper bail just equalize the rope back to the drums. On the drums there are wedges to dead end to them. I would imagine there is a way to adjust the two so there is equal pull both sides.
I am not to familiar with how the 495 is built internally.
