Work machine and mounting pin assembly

A work implement adapted to be mounted to a work vehicle in order to perform excavation work, comprising:

• a ground engaging tool that has a first through-hole and wears down during excavation work;
• a work implement-side adapter to which the ground engaging tool is attached and which has a second through-hole whose diameter is smaller than that of the first through-hole, and a contact face that comes into contact with the ground engaging tool so as to bear a load exerted during work using the ground engaging tool;
• a retaining pin that is inserted into the first and second through-holes disposed so as to pass through the adapter and the ground engaging tool in a state in which the ground engaging tool is in contact with the adapter, the retaining pin being a metal rod;
• a metal bushing that is a cylindrical member having an outside diameter that is larger than an outside diameter of the retaining pin, the retaining pin being inserted in an inside of the cylindrical member, which is disposed at an end portion of the retaining pin inside the first through-hole;
• and
• a metal retainer that prevents the bushing from coming loose from the retaining pin by sandwiching the bushing between the metal retainer and the adapter at the end of the retaining pin,
• wherein the bushing is disposed in a state that allows movement in an axial direction of the retaining pin between the adapter and the retainer on an outer peripheral face of the retaining pin.