Operator’s instructions
7. Drilling
74
Continued drilling
1. Raise the cradle approx. 100mm by moving the Rotation/Feed lever to RETURN
FEED position.
2. Percussion pressure must be low when starting drilling. Prepare by setting the
switch for percussion pressure to REDUCED PERCUSSION PRESSURE posi-
tion.
3. Set the DCT selector to DUST COLLECTOR+FLUSHING AIR position.
4. Move the Rotation/Feed lever to DRILL ROTATION position.
5. Move the Rotation/Feed lever to DRILL FEED position.
6. Start percussion by moving the percussion mechanism lever to PERCUSSION
MECHANISM position.
Drilling now starts.
7. Once the coupling sleeve has passed the drill steel support it must be closed in
order to obtain better control of the drill string. Move the drill steel support lever
to CLOSED position.
8. Normalise percussion pressure by setting the percussion pressure switch in
AUTOMATIC REGULATION OF PERCUSSION PRESSURE position.
Drill until the coupling sleeve reaches the drill steel support and repeat the procedure
with removing, jointing and continued drilling until you have reached the desired
hole depth.
Unthreading and extracting
Knock loose the joints before extraction.
1. Open the drill steel support fully by moving the drill steel support lever to OPEN
position.
2. Pull up the drill string until the sleeve is in the drill steel support by holding the
rapid feed lever in UP position.
3. Close the drill steel support by moving the drill steel support lever to CLOSED
position.
4. Unscrew the shank adapter from the upper coupling sleeve by holding the rotation
lever in BACKWARD ROTATION position.
5. Raise the rock drill about 10cm by holding the rapid feed lever in UP position.
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