A boom assembly for a pipelayer includes a boom member having a first end and a second end. The boom assembly includes a first boom block adapted to be removably coupled to the second end of the boom member. The boom assembly includes a second boom block adapted to be removably coupled to a chassis of the pipelayer. The boom assembly includes a first hook block adapted to be removably coupled to the second end of the boom member. The boom assembly includes a second hook block adapted to be operably coupled to the first hook block. The boom assembly also includes a first lifting connector disposed on the first boom block and a second lifting connector disposed on the first hook block. Each of the first lifting connector and the second lifting connector is adapted to removably receive a lifting strap therethrough.

A work attachment is capable of performing work at a high place while restricting the driving force required to lift the work attachment from its fallen posture in a folded state. The work attachment includes a main boom, a first insert boom and a second insert boom to be selectively used, an intermediate boom, an arm, and a distal working device. The intermediate boom has bendable first and second joints. The second insert boom has a fixed shape. The first insert boom is bent to project upward at a middle joint in the fallen posture, thereby making the center of gravity of the work attachment closer to a boom rotation center axis.

An apparatus for facilitating a pivotal movement of an implement relative to an arm of a machine includes a link. The link includes a first end segment, a second end segment, and an intermediate segment extending therebetween. Each of the first end segment and the second end segment includes an eyelet portion, and a stub portion that extends integrally and contiguously from the eyelet portion. The intermediate segment is coupled to the stub portion of the first end segment and to the stub portion of the second end segment.

A hybrid loader boom arm assembly for a loader work vehicle includes an arm assembly. The arm assembly includes a hollow first beam formed from a lightweight material and a block formed from a second lightweight material. The block has a first block end received within a first end of the first beam. The arm assembly includes at least one first steel reinforcing plate coupled to the first beam at the end, and at least one connecting plate coupled to the at least one first reinforcing plate.

The arm for the working machine includes: an arm body; and the bearing member attached to the arm body. The bearing member includes: a boss; and the greasing tube having: one end portion attached to a greasing hole provided on the boss; the other end portion attached to the arm body; and a tube body portion connecting the one end portion and the other end portion. The side surface of the arm body is provided with a cutout portion to which the tube body portion is inserted, the cutout portion opening toward the tip end portion. The one end portion of the greasing tube and the tube body portion are housed inside the arm body. The other end portion of the greasing tube is oriented to an outside of the arm through the cutout portion and fixed to the side surface of the arm.

A reinforcement structure that reinforces a boom of a work machine having a top plate, a pair of side plates, and a bottom plate forming an inner space therebetween. The plates are configured to form a curved portion at the middle of the boom along the longitudinal direction. The structure comprises a baffle disposed inside the boom rearward of the curved portion across the inner space. The baffle is a plate laterally bent so as to have a convex shape extending forward in the longitudinal direction. The reinforcement structure helps prevent twisting of the boom while dispersing stress concentrations in rear upper portions of the side plates compare to conventional flat baffle plates.

An apparatus for facilitating a pivotal movement of an implement relative to an arm of a machine includes a link. The link includes a first end segment, a second end segment, and an intermediate segment extending therebetween. Each of the first end segment and the second end segment includes an eyelet portion, and a stub portion that extends integrally and contiguously from the eyelet portion. The intermediate segment is coupled to the stub portion of the first end segment and to the stub portion of the second end segment.

A method for determining a load in a working machine including a linkage to be connected to an implement includes determining pressure in a first hydraulic cylinder and pressure in a second hydraulic cylinder arranged to control the linkage and determining at least one link angle between at least two links in the linkage. The method further includes, for a selected linkage bearing, determining at least two perpendicular force components acting on the selected linkage bearing, based on the determined pressure in each of the first and second cylinders and the at least one link angle; and determining a load on the selected linkage bearing as a linear combination of the at least two perpendicular force components using predetermined constants for the linear combination.

A hydraulic system for a working machine includes an fluid cooler including an input port and an output port, the fluid cooler being configured to cool an operation fluid, an outputting portion to output the operation fluid, a traveling hydraulic device to be activated by the operation fluid, an operating hydraulic device to be activated by the operation fluid, a first output fluid tube connecting the operating hydraulic device to a tank, a second output fluid tube branching from the first output fluid tube and being connected to the input port of the fluid cooler, a third output fluid tube connecting the outputting portion to the output port of the fluid cooler, a fourth output fluid tube connected to the traveling hydraulic device, the fourth output fluid tube being connected to the second output fluid tube, and a first check valve disposed on the fourth output fluid tube.

A hybrid loader boom arm assembly for a loader work vehicle includes an arm assembly that includes a first beam formed from a lightweight material and a second beam formed from the lightweight material. The loader boom arm includes a connection assembly having a first steel plate and a pair of knee plates formed from the lightweight material. A portion of the first steel plate is received within the first beam and a second portion of the first steel plate is received within the second beam. The pair of knee plates cooperate to define a first channel that receives the end of the first beam and a second channel that receives the second end of the second beam. The first steel plate and the pair of knee plates are configured for interconnecting the first beam with the second beam.