Abstract: In a pile driving hammer including a striker elevatable on guides by fluid pressure delivered to an operating fluid cylinder, and capable of being dropped to deliver a pile driving blow by exhausting fluid from the cylinder, a control system for the cylinder including a first cam carried by the striker and operable to cause delivery of fluid to the cylinder at the lower end of the stroke of the striker, a plurality of second cams carried by the striker and operable to cause exhaust of fluid from the cylinder at respectively different elevations of the striker, and remotely controlled apparatus for activating any selected one of the second cams.