| 摘要 |
In a percussion mach in particular a self-propelled ram boring machine, with a percussion piston which is axially movable in the machine housing, has a hollow piston rod and is acted on by a pressure medium via a supply hose connected to the rear end of the housing, a piston rod bore communicates with the pressure medium supply when the percussion piston is in the front end position and communicates with a discharge opening when the percussion piston is in the rear end position.
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