The invention relates to a rock drilling machine comprising a rotating devic e (1), a percussion device (2) and a shank (17) where a tool (18) is to be fastened. According to the inventive idea, lubricant used for lubricating th e shank is supplied in suitable conduits to pressurize the holes (3a'-3f') of coupling bolts that join together the different parts of the drilling machin e and delivered further in suitable conduits to serve as lubricant on the bearing surfaces between the rock drill and the feed equipment (21).
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