A bushing assembly for a track assembly includes a first end element, a second end element, and a central element positioned between the first end element and the second end element. The central element may be interference fit or positioned between the first end element and the second end element, and the central element may include a greater hardness than the first and second end elements. The first end element, the second end element, and the central element form a bushing with a longitudinal opening extending longitudinally through the bushing.

A track link which is a tracked undercarriage component is made of a steel having a specific component composition, and includes a high hardness portion having a hardness of HRC 57 or more and HRC 60 or less, and a low hardness portion. The high hardness portion includes a first matrix including a martensite phase and a residual austenite phase, and first nonmetallic particles dispersed in the first matrix and including at least one species selected from the group consisting of MnS, TiCN, and NbCN, and it does not include a M.sub.23C.sub.6 carbide. The low hardness portion includes a second matrix including a martensite phase, and second nonmetallic particles dispersed in the second matrix and including at least one species selected from the group consisting of MnS, TiCN, and NbCN, and it does not include a M.sub.23C.sub.6 carbide.

A track link which is a tracked undercarriage component is made of a steel having a specific component composition, and includes a high hardness portion having a hardness of HRC 57 or more and HRC 60 or less, and a low hardness portion. The high hardness portion includes a first matrix including a martensite phase and a residual austenite phase, and first nonmetallic particles dispersed in the first matrix and including at least one species selected from the group consisting of MnS, TiCN, and NbCN, and it does not include a M.sub.23C.sub.6 carbide. The low hardness portion includes a second matrix including a martensite phase, and second nonmetallic particles dispersed in the second matrix and including at least one species selected from the group consisting of MnS, TiCN, and NbCN, and it does not include a M.sub.23C.sub.6 carbide.

In some examples, a shoe pad for a grouser of a vehicle track defines a slot configured to receive a bracket that is configured to attach the shoe pad to a grouser. For example, a first arm of a bracket may be inserted into the slot and a second arm of the bracket may be configured to contact an interior side of a grouser of a vehicle track to attach the shoe pad to the grouser. In some examples, the shoe pad and the bracket may be held to the grouser with the aid of a bolt, which bolt may not extend through the grouser, but, rather, may merely engage with an exterior side of the grouser. In this way, the shoe pad may be able to be attached to a grouser without requiring one or more holes to be present in the grouser, while still providing a relatively tight fit with the grouser the shoe pad is configured to cover.

A self-propelled module for oversize loads includes two ground movement assemblies with oil-pressure controlled actuation; a transverse rocker arranged between the movement assemblies, which are coupled thereto independently; oil-pressure controlled suspension elements, arranged on corresponding oscillating supports coupled to the transverse rocker; and a load-bearing frame, supported by the oil-pressure controlled suspension elements. The load-bearing frame includes an oil-pressure controlled circuit adapted to serve the ground movement assemblies and the suspension means elements. The module further includes a rotary distribution unit, having a vertical axis, mounted on the load-bearing frame for supplying the ground movement assemblies and the oil-pressure controlled suspension elements, a first part of the rotary distribution unit being fixed to the load-bearing frame, and a second part being free to rotate about the vertical of the resting surface with respect to the load-bearing frame.

A self-propelled module for oversize loads includes two ground movement assemblies with oil-pressure controlled actuation; a transverse rocker arranged between the movement assemblies, which are coupled thereto independently; oil-pressure controlled suspension elements, arranged on corresponding oscillating supports coupled to the transverse rocker; and a load-bearing frame, supported by the oil-pressure controlled suspension elements. The load-bearing frame includes an oil-pressure controlled circuit adapted to serve the ground movement assemblies and the suspension means elements. The module further includes a rotary distribution unit, having a vertical axis, mounted on the load-bearing frame for supplying the ground movement assemblies and the oil-pressure controlled suspension elements, a first part of the rotary distribution unit being fixed to the load-bearing frame, and a second part being free to rotate about the vertical of the resting surface with respect to the load-bearing frame.

A track section (10) adapted to be linked to a plurality of similar track sections to form a track belt for mounting around the outer periphery of vehicle tyres. The track section comprises a crossbar member (11) and two lateral support members (12). A ground engageable support surface is provided on the outer side (14) of the crossbar member and comprises first and second elongated support surface sections (16, 17) extending in parallel with each other in the longitudinal direction of the crossbar member on opposite sides of a longitudinal centre line of the crossbar member. Each one of these elongated support surface sections (16, 17) is undulated, at least over a major part of its longitudinal extension, so as to form undulated support surface areas (18) with wave crests (19)and wave troughs (20) extending in the cross-direction of the crossbar member.

A ground-engaging track system includes a track roller having a roller shell with an outer tread surface, and a roller shaft supporting the roller shell for rotation and cantilevering the track roller to a track roller frame. The track roller is positionable in the track system to contact only one of a first track rail or a second rail in a ground-engaging track.

A mobile crane includes: a lower traveling body including a pair of crawlers; an upper slewing body supported on the lower traveling body slewably about a slewing axis; a tiltable attachment including a boom tiltably supported on the upper slewing body; and a physical quantity detector. The lower traveling body has a reaction force receiving part for receiving a reaction force from the ground at a position away from the slewing axis in a boom direction in a state where the pair of crawlers are in contact with the ground, the boom direction coinciding with a horizontal component of a direction in which the boom extends from the upper slewing body, and the physical quantity detector detects a physical quantity which changes in accordance with a change in the reaction force received from the ground by the reaction force receiving part.

A mobile crane includes: a lower traveling body including a pair of crawlers; an upper slewing body supported on the lower traveling body slewably about a slewing axis; a tiltable attachment including a boom tiltably supported on the upper slewing body; and a physical quantity detector. The lower traveling body has a reaction force receiving part for receiving a reaction force from the ground at a position away from the slewing axis in a boom direction in a state where the pair of crawlers are in contact with the ground, the boom direction coinciding with a horizontal component of a direction in which the boom extends from the upper slewing body, and the physical quantity detector detects a physical quantity which changes in accordance with a change in the reaction force received from the ground by the reaction force receiving part.