Abstract: The present disclosure relates to an apparatus and to a method for controlling a crane slewing gear. The apparatus comprises a hydraulic motor for driving the slewing gear and for braking the slewing gear from a rotational movement. The slewing gear is kept stationary via a holding brake. A hydraulic brake circuit for controlling the holding brake, a load sensing device for measuring a load instantaneously taken up by the crane, and an orientation sensing device for measuring an instantaneous orientation of the crane and/or of at least one crane component are furthermore provided. In accordance with the disclosure, a hydraulic limitation circuit is provided by means of which a hydraulic pressure applied to the motor can be limited to a specific limit value. A control unit is furthermore provided that determines a maximum permitted torque and/or a parameter derived therefrom for a current slewing gear movement.

Abstract: The invention relates to an undercarriage for a work machine, in particular a crawler crane, having a frame central part (for receiving a superstructure of the work machine), an elongate strut element which can be mounted on the frame central part, and a crawler support for supporting a crawler chain, wherein the crawler support has a recess for the passage of the strut element, and the strut element along its longitudinal direction has a plurality of spaced-apart locking elements for fixing the crawler support at different longitudinal positions of the strut element.

Abstract: The disclosure relates to a mobile crane, such as a crawler crane, comprising an undercarriage having a traveling gear, a superstructure rotatably supported about a vertical axle on the undercarriage, a boom connected in an articulated manner to the superstructure pivotable about a horizontal axle, an A frame connected to the boom via a guying means, and a retraction mechanism by means of which the A frame is pivotable. In accordance with the disclosure, the A frame is separable and comprises a pole connected in an articulated manner to the superstructure and a folding pole releasably connected to the pole.

Abstract: The present disclosure relates to an apparatus and to a method for controlling a crane slewing gear. The apparatus comprises a hydraulic motor for driving the slewing gear and for braking the slewing gear from a rotational movement. The slewing gear is kept stationary via a holding brake. A hydraulic brake circuit for controlling the holding brake, a load sensing device for measuring a load instantaneously taken up by the crane, and an orientation sensing device for measuring an instantaneous orientation of the crane and/or of at least one crane component are furthermore provided. In accordance with the disclosure, a hydraulic limitation circuit is provided by means of which a hydraulic pressure applied to the motor can be limited to a specific limit value. A control unit is furthermore provided that determines a maximum permitted torque and/or a parameter derived therefrom for a current slewing gear movement.

Abstract: The disclosure relates to a mobile crane, such as a crawler crane, comprising an undercarriage having a traveling gear, a superstructure rotatably supported about a vertical axle on the undercarriage, a boom connected in an articulated manner to the superstructure pivotable about a horizontal axle, an A frame connected to the boom via a guying means, and a retraction mechanism by means of which the A frame is pivotable. In accordance with the disclosure, the A frame is separable and comprises a pole connected in an articulated manner to the superstructure and a folding pole releasably connected to the pole.

Abstract: The present invention relates to a ballast apparatus for attaching to the rear of a crane superstructure, in particular of a crawler-mounted crane, having a base plate and a plurality of stackable ballast plates, wherein at least two carrier plates for receiving stacked ballast plates are connected to the base plate in an articulated manner pivotable about vertical pivot axes.

Abstract: The present invention relates to a ballast apparatus for attaching to the rear of a crane superstructure, in particular of a crawler-mounted crane, having a base plate and a plurality of stackable ballast plates, wherein at least two carrier plates for receiving stacked ballast plates are connected to the base plate in an articulated manner pivotable about vertical pivot axes.

Abstract: The present disclosure relates to a holding device for storing holding rods on a crane, with at least two holders, at least one securing piece and at least one lock, wherein the at least two holders comprise at least one toothed connecting surface each and at least four lead-throughs each, at least one of which each is designed as oblong hole. According to the present disclosure, the at least two holders are connectable with each other via a connector through the one oblong hole each and are connectable with the crane through at least one further lead-through each, wherein the at least two holders together comprise a common U-shaped deposition region for accommodating and horizontally fixing holding rods, and wherein the holding rods are vertically fixable by means of the at least one securing piece and the at least one lock inside the U-shaped deposition region.