A lifter assembly includes a base having a top and a bottom surface. Connectors are attached to the base extending outwardly from the bottom surface. Each of the connectors includes at least one rail wheel rotatably attached thereto. The base includes traveling wheels rotatably attached thereto. A post is attached to the base extending outwardly from the top surface to a distal end. An arm is disposed on the distal end, rotatably attached to the post, extending outwardly to a terminal end. A support is movably attached to the arm and extends outwardly to a support end. A trolley is slidably disposed on the arm and movable along the arm between the terminal end and the post. Each of the traveling wheels includes a leg pivotably attached to the base connecting the traveling wheel to the base and move the traveling wheel between a transport and a storage position.

A lift device includes a chassis, a boom pivotally coupled to the chassis, a first leveling assembly pivotally coupled to a first end of the chassis, a second leveling assembly pivotally coupled to an opposing second end of the chassis, and a control system. The first leveling assembly includes a first pair of actuators positioned to facilitate a first pitch adjustment and a first roll adjustment of the first end of the chassis. The second leveling assembly includes a second pair of actuators positioned to facilitate a second pitch adjustment and a second roll adjustment of the opposing second end of the chassis. The control system is configured to (i) actively control the first pair of actuators and the second pair of actuators during a first mode of operation, and (ii) actively control the first pair of actuators and facilitate passive control of the second pair of actuators during a second mode of operation.

A lift device includes a chassis, a boom pivotally coupled to the chassis, a first leveling assembly pivotally coupled to a first end of the chassis, a second leveling assembly pivotally coupled to an opposing second end of the chassis, and a control system. The first leveling assembly includes a first pair of actuators positioned to facilitate a first pitch adjustment and a first roll adjustment of the first end of the chassis. The second leveling assembly includes a second pair of actuators positioned to facilitate a second pitch adjustment and a second roll adjustment of the opposing second end of the chassis. The control system is configured to (i) actively control the first pair of actuators and the second pair of actuators during a first mode of operation, and (ii) actively control the first pair of actuators and facilitate passive control of the second pair of actuators during a second mode of operation.

The invention relates to a tread device for walking on a crawler carrier of a work machine having a caterpillar drive, wherein the tread device has a holder that can be installed at the crane, in particular at the crawler carrier, at which at least one tread surface is provided, characterized in that the tread surface lies on the upwardly disposed surface of a crawler chain of the caterpillar drive in the state installed at the work machine and the lower side of the tread surface comprises at least one sliding element to ensure a sliding or rolling relative movement between the crawler chain and the tread surface.

The invention relates to a tread device for walking on a crawler carrier of a work machine having a caterpillar drive, wherein the tread device has a holder that can be installed at the crane, in particular at the crawler carrier, at which at least one tread surface is provided, characterized in that the tread surface lies on the upwardly disposed surface of a crawler chain of the caterpillar drive in the state installed at the work machine and the lower side of the tread surface comprises at least one sliding element to ensure a sliding or rolling relative movement between the crawler chain and the tread surface.

A running wheel (1, 2) for a crane (16), in particular gantry crane, comprising a shaft (3), a wheel rim (4) and a hub (5) connecting the shaft (3) to the wheel rim (4) for rotation therewith, at least one connection between the hub (5) and the shaft (3) and/or between the hub (5) and the wheel rim (4) having a press fit (6) and a first form fit established by a first stop surface (8), the first form fit blocking a relative movement of the hub (5) in relation to the shaft (3) or the wheel rim (4) in a first direction (17) running parallel to an axis of rotation (7) of the running wheel (1, 2), wherein the connection additionally has at least one second form fit established by a second stop surface (9), wherein the second form fit blocks the relative movement of the hub (5) in relation to the shaft (3) or the wheel rim (4) in a second direction (18) opposed to the first direction (17).

A crawler type crane having a base carrier unit having a control unit associated therewith and an upper portion assembly having a boom portion coupled at end to the base carrier unit and to a jib portion at an opposed end. The boom portion includes one or more selected boom sections that are articulatable relative to each other. The crane also includes a multi-function attachment unit that is coupled to the jib portion and has a grappling unit for grasping a work piece and a saw attachment unit for cutting the workpiece. The crane can also include a first fluid regulating device coupled to the jib portion for regulating a fluid to the jib portion and to the multi-function attachment unit and a second fluid regulating device coupled to the boom portion for regulating a fluid to the winch element and to the multi-function attachment unit.

A crawler type crane having a base carrier unit having a control unit associated therewith and an upper portion assembly having a boom portion coupled at end to the base carrier unit and to a jib portion at an opposed end. The boom portion includes one or more selected boom sections that are articulatable relative to each other. The crane also includes a multi-function attachment unit that is coupled to the jib portion and has a grappling unit for grasping a work piece and a saw attachment unit for cutting the workpiece. The crane can also include a first fluid regulating device coupled to the jib portion for regulating a fluid to the jib portion and to the multi-function attachment unit and a second fluid regulating device coupled to the boom portion for regulating a fluid to the winch element and to the multi-function attachment unit.

A boom lift includes a base having a first end and an opposing second end, a turntable coupled to the base, a boom coupled to the turntable, an assembly pivotably coupled to the first end of the base, and a first actuator coupled to the first end of the base and the assembly. The assembly includes a tractive element. The assembly extends from the base such that the tractive element is longitudinally offset from and spaced forward of the first end and the opposing second end of the base.

A boom lift includes a base having a first end and an opposing second end, a turntable coupled to the base, a boom coupled to the turntable, an assembly pivotably coupled to the first end of the base, and a first actuator coupled to the first end of the base and the assembly. The assembly includes a tractive element. The assembly extends from the base such that the tractive element is longitudinally offset from and spaced forward of the first end and the opposing second end of the base.