When counterweight is added to the rear of the upperworks, what happens to the crane's center of gravity?

When counterweight is added to the rear of the upperworks of a crane, the crane's center of gravity shifts toward the counterweight. This is because the center of gravity is the point where the weight of the crane is effectively concentrated. By increasing the weight at the rear, you are essentially redistributing the overall mass of the crane, which results in the center of gravity moving in the direction of the added mass (the counterweight).

Maintaining proper balance and understanding how the center of gravity shifts is crucial for safe crane operation. If the center of gravity moves too far, it can lead to instability, making it essential for riggers and operators to factor in where the counterweights are placed in relation to the loads being lifted.