Bosch GDB 2500 WE Professional - Manual (Page 17)

English | 17
Bosch Power Tools 1 609 929 W83 | (9.11.10)
Operation
Starting Operation
f Observe correct mains voltage! The voltage
of the power source must agree with the
voltage specified on the nameplate of the
machine. Power tools marked with 230 V
can also be operated with 220 V.
f Before beginning work, consult the struc-
tural engineer, architect or construction
supervisor in charge. Only cut through rein-
forcements with the permission of a struc-
tural engineer.
f When core drilling through walls or floors,
ensure to check the respective rooms/en-
closures for obstructions. Barrier off the
construction site and secure the drilled out
core against falling down with the use of
casing or similar.
Operational Check of the Residual Current
Device
Check the proper function of the residual cur-
rent device 2 each time before working:
– Push the “RESET” button on the residual cur-
rent device. The service readiness of the re-
sidual current device is signalled through a
red control indicator.
– Push the “TEST” button. The indicator above
the “RESET” button becomes black.
Switching On
Push the “RESET” button on the residual cur-
rent device 2.
Open the water cock 11. Check the flow of wa-
ter at the water-flow indicator 10.
For starting the drilling procedure at half
speed, turn the On/Off switch 13 to the 1/2 po-
sition. The switch cannot be locked in this posi-
tion.
For drilling, turn the On/Off switch 13 to the I
position.
Switching Off
Release the On/Off switch 13 or turn it to the 0
position.
Shut the water cock 11. After finishing work,
disconnect the water outlet connector 3 from
the water supply. Open the water cock 11 and
drain the remaining water.
Adjusting the Speed
Two speed ranges can be preselected with the
gear selector 4.
The two gears are recommended for the follow-
ing bore diameters:
Working Advice
f Before any work on the machine itself, pull
the mains plug.
For drilling, release the lock of the feed handle
5 (see operating instructions of the drill stand).
Start the drilling procedure at half speed
(On/Off switch in the 1/2 position) until the
core bit rotates vibration-free in the material.
Then continue drilling at full speed (On/Off
switch in the I position).
While drilling, adapt the feed pressure to the
material being drilled. Drill with uniform pres-
sure. Lightly pull the core bit out of the bore
from time to time so that the drilling sludge is
removed from the core bit segments.
Do not overload the machine. The control indi-
cator 12 flashes in case of overload (see “Con-
trol Indicator”).
Safety Clutch
If the core bit becomes caught or jammed, the
drive to the drill spindle is interrupted. In this
case, switch the machine off and free the core
bit.
1st gear 82–212 mm
2nd gear 32–132 mm
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