Hydraulic hammer

A method of assembling a power cell that comprises a head and a cylinder, the head having a top end and including a main bore, a satellite bore, a lower retainer and a sealing member disposed on a shelf, the main bore extending parallel to a longitudinal axis defined by the power cell and having an inner surface, the main bore including an upper chamber disposed adjacent to the top end, the upper chamber including a trough, a first furrow, a second furrow, a lock wall and the shelf, the trough inset into the inner surface and including a port that extends from the main bore into the satellite bore, the first and second furrows inset into the inner surface and intersecting the trough, the lock wall disposed adjacent the top end and extending between the first and second furrows, the lock wall further extending from the top end to the port, the satellite bore disposed radially outward of the main bore, and the lower retainer disposed in the satellite bore and including a core member and a jut angled outward from the core member, the core member including a bore configured to receive a fastener, the cylinder including a body and a protrusion, the body extending between a first end and a second end of the cylinder, the protrusion disposed on an outer surface of the body and adjacent to the first end, the first end of the cylinder disposed in the upper chamber, the cylinder rotatable in the upper chamber from an unlocked position to a locked position, wherein when the cylinder is in the locked position and the fastener is received in the bore of the core member, the protrusion abuts the lock wall and the jut, wherein the fastener is a bolt, a threaded bolt or a screw, the method comprising:

• sliding the protrusion of the cylinder into the first furrow until the first end of the cylinder rests against the sealing member;
• rotating the cylinder to the locked position in which the protrusion is disposed in the port;
• and
• urging the a contact face of the jut and a first sidewall of the protrusion into compressive engagement with one another by tightening the fastener in the bore of the lower retainer.

A hammer comprising:

• a housing;
• and
• a power cell disposed in the housing and defining a longitudinal axis, the power cell comprising:
• a head having a top end and a bottom end, the head including:
• a main bore that extends parallel to the longitudinal axis, the main bore having an inner surface and including an upper chamber disposed adjacent to the top end and a tool channel extending from the upper chamber to the bottom end of the head, the tool channel configured to receive a work tool, the upper chamber including:
• a trough inset into the inner surface and including a port that extends from the main bore into a satellite bore;
• a first furrow and a second furrow, each of the first and second furrows inset into the inner surface and extending from the top end to intersect the trough;
• and
• a lock wall disposed adjacent the top end and extending between the first furrow and the second furrow, the lock wall including an upper face disposed at the top end and a lower face disposed adjacent to the port;
• the satellite bore disposed radially outward of the main bore and extending parallel to the longitudinal axis;
• and
• a lower retainer disposed in the satellite bore, the lower retainer including a core member and a jut angled outward from the core member, the jut including a contact face, the core member including a threaded bore configured to receive a fastener, the lower retainer configured to urge the contact face of the jut and a first sidewall of a protrusion into compressive engagement with one another when a fastener is threadingly received in the threaded bore and a cylinder is in a locked position;
• the cylinder including a body and the protrusion, the body extending between a first end and a second end of the cylinder, the protrusion disposed on an outer surface of the body and adjacent to the first end, the first end disposed inside the upper chamber, the protrusion including a top surface extending from the first sidewall to a second sidewall, the protrusion extending through the port, the cylinder rotatable in the upper chamber from an unlocked position to the locked position, wherein when the cylinder is in the locked position and the fastener is threadingly received in the threaded bore of the core member, the first sidewall of the protrusion extends through the port and is in compressive engagement with the contact face of the jut and the second sidewall of the protrusion is in compressive engagement with the lower face of the lock wall;
• and
• a piston disposed in the cylinder and configured to translate in a direction parallel to the longitudinal axis,
• wherein the fastener is a bolt, a threaded bolt or a screw.