A hydraulically operated traveling crane includes a chassis or support constructed and arranged to permit the crane to be operated with a lattice boom or with a telescopic boom. The carrying chassis includes plates which are mounted on a base and which include an inclined front wall with a pivot bearing at the lower end for either the lattice boom or for a whipping cylinder for a telescopic boom. The upper end of the inclined front edge provides a rotatable support for a pivot journal for a backdrop support for the lattice boom or for the pivotal support for the telescopic boom. The mounting plates on the carrying chassis include a rearward extension providing a rotatable support for two rotatable pulleys of the hoisting gear around which connecting cables for the telescopic boom or the lattice boom or an extension of either may be connected. The mounting platform of the chassis provides means for mounting a support plate for cable winches which are employed with the lattice boom and these may be easily removed when the telescopic boom is positioned on the chassis. The cable winches include the cable lines which are provided for raising and adjusting the lattice boom. A pump unit for the hydraulic controls is arranged below the rearward extension mounting the cable winches. Guide pulleys for the boom cables are advantageously mounted on a combining unit which includes an adjustable triangular plate member mounting the pulleys.
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