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Mobile drilling rig equipped with Rexroth hydraulics frees Chilean miners



Rescue 33 miners trapped in a gold mine collapse, using Schramm Inc.’s advanced T130XD mobile deep drilling rig to drill a 28-inch wide hole 2,300 feet through solid granite

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Rexroth Solution:

Four Rexroth AA11VLO130 variable displacement axial piston hydraulic pumps:

  • Open circuit pump with charge pump
  • Nominal pressure 5100 psi (350 bar)
  • Peak pressure 5800 psi (400 bar)
  • Displacement of 130 cc/rev. or 7.93 in3/rev.


  • High displacement capacity and proven reliability support the T130XD’s performance
  • Rexroth pumps power the top head and master cylinders of the drilling system—to manage thousands of feet of drill pipe
  • Schramm rig originally designated as “Plan B” quickly turns into the primary rescue solution
  • Three-month estimate of original drilling rescue timeframe was reduced to 33 days
  • All 33 miners recued safely