Abstract: A method of retaining a hammer tool in the front head of a powercell assembly of a hammer assembly includes biasing a hammer tool retaining pin such that a portion of the tool retaining pin extends into a tool receiving bore of the front head of the powercell assembly, holding a hammer tool in the tool receiving bore of the front head of the powercell assembly via the tool retaining pin, and releasing the hammer tool remotely from the hammer assembly.

Abstract: A method of retaining a hammer tool in the front head of a powercell assembly of a hammer assembly includes biasing a hammer tool retaining pin such that a portion of the tool retaining pin extends into a tool receiving bore of the front head of the powercell assembly, holding a hammer tool in the tool receiving bore of the front head of the powercell assembly via the tool retaining pin, and releasing the hammer tool remotely from the hammer assembly.

Abstract: A hydraulic hammer may include a power cell adapted to reciprocally drive a piston along an axis. The piston may, in turn, drive a hammer tool. A power cell and housing may be axially secured together by a plurality of tie rods and nuts secured to ends of the tie rods, and the housing may include open-sided pockets for accommodating the nuts. Each pocket may include a cavity that accommodates an extension of the tie rod or a specially formed nut to minimize movement of the nut in the direction of the pocket opening and thereby minimize bending of the tie rod. Engaging the back of the nut with the inside of the nut pocket further reduces the opportunity for the nut to rotate in the nut pocket as a result of force applied to the nut by the tie rod.