The knife arm assembly for connecting a sickle drive to the knife of a sickle, has a knife arm including a cavity and an opening at one end that holds a bearing for receiving a knife pin of the sickle, and a shoulder extending at least partially about and defining a second opening at an opposite end of the cavity smaller than the first opening, and a plug disposed in the second end of the cavity adjacent the end of the bearing and enclosing the second opening, the plug being configured to be forceably movable through the cavity toward the first opening and against the bearing for forcing the bearing from the knife arm, providing easy serviceability, protection from dirt, dust, and other contaminants.
