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    When a hydraulic pump reaches the "overhaul point", it is normal for its internal components to present all sorts of wear and damage. In a swashplate type pump, for example, piston shoes almost always show signs of abrasive wear -  high speed sliding contact with the swashplate makes any particle trapped under the shoe count. In rare cases  the amount of wear reaches "extravagant" proportions - something you can witness on these pictures, which exhibit piston heads worn out flat! The balancing cavity is gone and the shoe is probably twice as thin (compared to a "normal" one). Apparently, there was no one around the equipment to shut it down and send the pump to a workshop at first (second, third..) sign of efficiency loss.
  
damaged pistons
damaged pistons
damaged pistons