Abstract: A power shovel comprises a boom which is supported on an undercarriage and can be lifted and lowered. A hydraulically operated shovel mechanism is mounted at a front end of the boom before pivoting about a horizontal axis. The shoveling mechanism carries a pivotable shovel and at least one cable pulley. A cable hoisting gear engaged with the boom is operable to move the boom. A cable of the cable hoisting gear is trained or reeved on the cable pulley of the shoveling mechanism so that the shoveling mechanism can be moved by the hoisting gear with movement of the boom.

Abstract: A tracklaying vehicle comprises first and second laterally spaced tracklaying units which are spaced apart in a travel direction from third and fourth tracklaying units which are spaced laterally from each other. A substructure which is supported on and located in between the tracklaying units includes a carrier shaft extending in the travel direction which provides a journal for rotatably mounting a cross beam which extends between one set of the tracklaying units, for example, the first and second tracklaying units. The other set of tracklaying units, the third and fourth one, are designed as steering units, and they are mounted on individual arms which are pivotally mounted on vertical pivots of the substructure and which are connected to steering devices for pivoting them about the rotatable mountings on each side of the substructure in order to shift the position of the third and fourth tracklaying units.