A track link includes a tread surface, a shoe surface, a communicating part, and a seat formation part. The tread surface comes into contact with a roller for an undercarriage. The shoe surface is disposed on an opposite side from the tread surface. A track shoe is attachable to the shoe surface. The communicating part is disposed between the shoe and tread surfaces. The communicating part passes through the track link in a width direction that is perpendicular to a linking direction, and allows side faces of the track link to communicate in the width direction. The seat formation part is formed on a shoe surface side of the communicating part. A through-hole passes through from the shoe surface to the seat formation part, and a bolt member is disposable in the through-hole. A number track links in a loop are usable in a track of a work vehicle.

A method for producing a forged crankshaft includes: a preforming step of forming a preformed blank with no flash, the preformed blank including a shape of the crankshaft, wherein the crank arm have excess projecting portions at an outer peripheries of side portions of the crank arm near the crank pin; a die forging step of forming a forged blank with flash by pressing the preformed blank with a pair of first dies; and a trimming step of removing the flash from the forged blank. In the die forging step, while a second die is abutted against a journal-side surface of the crank arm and holds the surface, the excess projecting portions of the crank arm are deformed by the first dies so as to increase the side portions of the crank arm in thickness.

A method for manufacturing a ring-shaped member includes preparing a workpiece, pressing a first member against the workpiece to form a depression having a depth in an axial direction in the workpiece, punching out a bottom portion of the depression in the workpiece using a second member, and deforming a circumferential wall in accordance with relative movement between the workpiece and a third member.