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18 | English
1 609 929 T41 | (12.11.09) Bosch Power Tools
Replacing the Drill Chuck (see figure C)
To dismount the key type drill chuck 1 position
an open-end spanner (size 27 mm) against the
nut on the drive spindle. Firmly hold the key
type drill chuck with one hand and with the oth-
er hand, turn the open-end spanner in anticlock-
wise direction until the drill chuck is released
from the tapered drill spindle.
f Keep the drill spindle taper and the drill
hole of the drill chuck free from grease and
debris.
To mount the key type drill chuck 1 turn the nut
on the drive spindle in clockwise direction to
the stop. Place the key type drill chuck without
force onto the drive spindle until it is tightly
seated. Apply light blows with a rubber hammer
onto the face side of the key type drill chuck 1
to ensure tight seating of the chuck. Pay atten-
tion that the clamping jaws of the key type drill
chuck do not project, in order not to damage
them.
Dust/Chip Extraction
f Dusts from materials such as lead-containing
coatings, some wood types, minerals and
metal can be harmful to one’s health. Touch-
ing or breathing-in the dusts can cause aller-
gic reactions and/or lead to respiratory infec-
tions of the user or bystanders.
Certain dusts, such as oak or beech dust, are
considered as carcinogenic, especially in
connection with wood-treatment additives
(chromate, wood preservative). Materials
containing asbestos may only be worked by
specialists.
Provide for good ventilation of the work-
ing place.
It is recommended to wear a P2 filter-
class respirator.
Observe the relevant regulations in your
country for the materials to be worked.
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.
Reversing the Rotational Direction
The rotational direction switch 6 is used to re-
verse the rotational direction of the machine.
However, this is not possible with the On/Off
switch 4 actuated.
Right rotation: For drilling and screwdriving,
press the rotational direction switch 6 down-
ward to “R”.
Left rotation: For loosening and unscrewing
screws and nuts, press the rotational direction
switch 6 upward to “L”.
Gear Selection, Mechanical
f Actuate the gear selector 2 only when the
machine is at a standstill.
Two speed ranges can be preselected with the
gear selector 2.
1st gear:
Low speed range; for working with
large drilling diameter.
2nd gear:
Higher speed range; for working
with small drilling diameter.
If the gear selector 2 cannot be fully engaged,
lightly rotate the drive spindle with the drill bit
by twisting the drill chuck.
OBJ_BUCH-21-004.book Page 18 Thursday, November 12, 2009 11:37 AM
18


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