A crawler crane includes a lower traveling body, and the lower traveling body includes: a car body; a right crawler device and a left crawler device; a front side connecting portion; and a rear side connecting portion, the right crawler device includes a right crawler frame, the left crawler device includes a left crawler frame, the front side connecting portion is separably joined to each of a front end portion of the car body, the right crawler frame front portion and the left crawler frame front portion, the rear side connecting portion is separably joined to each of a rear end portion of the car body, the right crawler frame rear portion and the left crawler frame rear portion, and each of the front side connecting portion and the rear side connecting portion includes a lattice portion which has a lattice structure.

A system for transporting a crane includes a crane which has a boom which is connected to a base, the base has a front end and an opposite rear end. A coupler is connected between a tractor and the front end of the base. A dolly is connected to the rear end of the base. In an embodiment the dolly includes a rear cradle which is shaped and dimensioned to receive and support the boom during transporting. In another embodiment the coupler includes a front cradle which is shaped and dimensioned to receive and support the boom during transporting.

A hoisting apparatus that is operable to lift objects from a transport vehicle and further provide positioning thereof in alternate location wherein the present invention provides load leveling and balancing of the object while suspended. The present invention includes a housing that is suspendedly mounted to a crane lifting block. The housing includes an exterior wall having a top and a bottom and further including an interior volume with an opening at the bottom substantially the diameter of the housing. The housing has mounted therein four winches wherein each of the four winches is independently operated so as to separately control the length thereof. A center attachment member is present that is configured to secure the hoisting apparatus to the lifting block of a crane. Securing members are operably coupled to the center attachment member and are equidistantly distributed around the circumference of the housing.

A coupling portion of a lower travelling body of a mobile crane is arranged such that, in plan view, a right front straight line, which passes through any point included in a front load receiving surface and through any point included in a right front load transmission surface, passes through a right front end roller or a point on the front side relative to the right front end roller and that a left front straight line, which passes through any point included in the front load receiving surface and through any point included in a left front load transmission surface, passes through a left front end roller or a point on the front side relative to the left front end roller.

Crane assemblies for attachment to a vehicle tow hitch are described.

Provided are a work machine and engine stopping control device that make it possible to efficiently perform a setting operation related to crane work. When performing prescribed work, the work mode of a work device can be set, and it is determined whether or not the work device is in a setting state in which this work mode is being set. Due to this, when the work device is determined to be in the setting state, stopping of the engine is restricted even if an idling stop permission condition is met.

A system for transporting and operating a crane includes a front adapter which connects to the front end of the base of the crane, and a rear adapter which connects to the rear end of the base of the crane A coupler pivotally connects to the front adapter, and also connects to the tractor. A dolly pivotally connects to the rear adapter. In a transportational configuration the crane is suspended above the support surface between the coupler and the dolly. In an operational configuration the coupler and the dolly remain connected to their respective adapters, with their weight fully supported by the ground. This allows the crane to be used with no reduction to the manufacturer's rated capabilities. In accordance with another embodiment, the dolly includes a rear cradle which is shaped and dimensioned to receive and support the boom during transportation. In accordance with another embodiment, the coupler includes a front cradle which is shaped and dimensioned to receive and support the boom during transportation.

A vehicle includes a chassis supporting a plurality of wheels, a prime mover supported by the chassis, and a vehicle body supported by the chassis and including a main body and a cab. A boom assembly is coupled to the main body, including an electric actuator and an electric motor, and an electrical accessory equipment system is also coupled to the main body. The electrical accessory equipment system comprises one or more batteries and an electric power control box housing a power conditioner that is configured to supply power from the one or more batteries to the electric actuator and/or the electric motor.