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Operator's instructions
7. Drilling
Changing drill bit
• Moving parts
• Risk of personal injury, clothing can be
trapped
• Stop rock drill rotation when changing bits
• Before working on the drilling rod with your
hands, ALWAYS make sure that indicator
light 2 located on the control box onboard
the slide is GREEN
N.B.
Never start percussion with the drill bit free without any resistance.
1. Operate the feeder until the spike is approx. 10 cm from the rock.
2. Make sure that the rotation lever is in neutral
3. Move the drill bit forward until it is pressed against the rock.
4. Switch on high percussion pressure for several seconds.
5. Switch off percussion pressure when the drill bit has loosened. If the percussion
pressure is engaged for too long then the drill steel can detach from the shank
adapter.
6. Unscrew the old drill bit by hand and replace with a new one.
Action in case of drilling problems
Drilling problems
If the following trouble occurs during drilling:
• Hot coupling sleeves (loose coupling sleeves)
• Difficulties in uncoupling the coupling sleeves
• Hole deflections
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