The present invention relates to a crane, particularly a crawler crane, whereby at least two different drive units can be alternately connected with the crane. The invention is additionally directed at corresponding drive units.

This invention relates to a crane, in particular a mobile crane or crawler crane, comprising a main boom and a counter boom as well as an erecting trestle arranged on the uppercarriage of the crane, which is connected to a guying of the counter-boom via a cable adjuster, wherein there is provided at least one pressure prop articulated to the counter-boom or on the pivot axis of the counter-boom in order to temporarily receive the cable adjuster and/or the guying, wherein the receiving point of the pressure prop is designed such that the cable adjuster or guying can lift off from the pressure prop on its own at a particular erecting angle of the counter-boom.

A backstop to prevent contact between a spacer and a peripheral member includes a rear jib backstop for a crane, having an outer cylinder, an inner cylinder, a spacer, a spacer holder and a lock mechanism. The spacer holder supports the spacer pivotally and swingably about an axis thereof and allows the spacer to fit on the inner cylinder, to keep the rear jib backstop from contracting in accordance with a change in a posture of the rear jib backstop when a boom rises. The lock mechanism enables locking of the spacer in such a manner as to keep the spacer from swinging about a swing central axis in a state where the spacer is located away from an outer surface of the inner cylinder.