Abstract: An adapter assembly for use with the pivot pin of a conventional Leach 2R-1006 type operating cylinder. The adapter assembly obviates the need for stocking three different types of replacement pivot pins. Instead of three types, only one type is necessary because it can be combined with the adapter assembly to provide functional equivalents of the other two types.Specifically, the adapter assembly is used with a conventional Leach 2R-1916 pivot pin which has an axially bored, internally threaded end. The adapter assembly includes a stepped cylindrical adapter element having a head portion and a contiguous, axially aligned, reduced diameter neck portion. The adapter element has a smooth axial bore throughout its length. The adapter assembly also includes a bolt which is inserted into the head portion end and through the axial bore of the adapter element and which is threadably engaged into the threaded end of the pivot pin.