A window lift system, especially for the side window of a motor vehicle, includes (i) a pulling device and (ii) a catch for a window pane, which can be moved up and down using the pulling device. The catch has a first fastening point for an upward pulling end of the pulling device and a second fastening point for a downward pulling end of the pulling device, which point is horizontally off-set from the first fastening point in the window pane plane when the window pane is fitted. The window lift system also includes (iii) an arrangement positioning and fixating the catch in terms of at least three degrees of freedom so that the catch can be maintained in a position that is defined in terms of the degrees of freedom even when the window pane is not yet fitted.