For controlling relative movement between individual components (11, 13, 15) of a control system (310) for cargo hoisting devices comprising a trolley (2) adapted for movement along a crane girder (20) and having a structural part (4) supporting said control system, at least selected components (11, 13, 15) of the control system (310) are positioned with their center of gravity (CG1, CG2 and CG3, respectively) lying at a maximum distance (MD1, MD2 and MD3, respectively,) from a top plane (TP) of the structural part that corresponds approximately to half the height (H1; H2; H3) of said component or components in a direction transversal to said top plane.