Daniel,
It is what it says on the tin. The CH-53K can carry a useful payload (i.e. passengers and/or cargo) of 27000lb for 110 nm and then return to base. Of course other factors will influence this, such as temperature and altitude. If the aircraft needed to carry more, then some fuel would need to be offloaded, and hence would not be able to fly as far (I am assuming that the example you quote is for full fuel.)