Auto-lubrication system for a work tool

A demolition hammer powered by a drive fluid, comprising:

• a housing;
• a piston disposed within the housing;
• a tool disposed within the housing to be acted upon by the piston;
• a lubrication system, comprising:
• a housing defining a drive fluid chamber and a lubricant chamber;
• a first movable member positioned within the drive fluid chamber and movable from a first position to a second position within the drive fluid chamber in response to drive fluid pressure acting on the first movable member;
• a second movable member at least partly positioned within the lubricant chamber, the second movable member operatively coupled to the first movable member and movable between a first position and a second position within the lubricant chamber;
• a biasing member positioned within the drive fluid chamber, the biasing member biasing the first movable member toward the first position;
• and
• a relief valve associated with the first movable member, the relief valve having an open state and a closed state;
• wherein in the open state, the drive fluid pressure acting on the first movable member is reduced such that the biasing member moves the first movable member to the first position within the drive fluid chamber.