Nobody answered this??? Well, this problem IS rather involved.
Generally speaking, a Free-Body diagram should only contain ONE simple object. You should have one for the ball , one (a different one) for the boom, one for the pulley, one for the base, one for the lifting cable, etc.
When the the crane is rotating about a vertical axis, the portion of the lifting cable between the ball and the pulley is not vertical. The vertical component of the tension in this cable is equal to (250kg)·(9.8m/sē)=2450N. The horizontal component of the tension is equal to the centripetal force required to make the ball follow a circular path.
There are several forces on the boom. The supporting cable does not support all of the boom's weight. However, it does support some other forces which are transmitted through the boom.