FlexiROC T30 R 4 Operation
97 No: 2969809547.1.2969824267 en-US
NOTICE
High Impact Percussion
Risk of damage to drill
u Never start percussion with the drill bit in mid-air.
1.
Operate the feeder until the dowel is approximately 10 cm from the rock.
2.
Make sure that the rotation lever is in neutral position.
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 pres-
sure is engaged for too long, then the drill rods can disconnect from the shank
adapter.
6.
Loosen the old drill bit by hand and replace with a new one.
4.4.20 In Case of Breakdown or Incident
Checking High Coupling Sleeve Temperature
!
NOTE: Coupling sleeve temperature must not exceed 120ºC (248ºF).
Depending on the layers of the rock, temperature can vary even within a small area. High
coupling sleeve temperature is usually due to a poor ratio between drill feed pressure, per-
cussion pressure and rotation pressure.
Excessive coupling sleeve temperature is indicated by:
n Measuring with a thermometer.
n Oil dripping from the rock drill vaporizing on the coupling sleeve.
n The coupling sleeve changing color.
Reducing Coupling Sleeve Temperature
1.
Check the condition of the drill bit. An overdrilled bit generates less torque in the cou-
pling sleeve.
2.
Grind the drill bit.
3.
Change to a drill bit with ballistic buttons.
4.
Reduce rotation speed as much as possible without causing the drill string to rotate
jerkily If the rock is too hard for ballistic bits.
5.
Check the dampening pressure and set it to the recommended level. Reduce percus-
sion pressure to below the basic setting (5-10 bar). A reasonable reduction in pene-
tration rate must be accepted.
6.
Check and/or adjust feed pressure so that the shank adapter is in “float position”.
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