Bosch Professional GSB 780 Manual Original página 22

22 | English
Clamp the short end of an Allen key 17 into the
keyless chuck 1.
Place the machine on a stable surface (e. g. a
workbench). Hold the machine firmly and loos-
en the keyless chuck 1 by turning the Allen key
17 in rotation direction
keyless chuck by giving the long end of the Allen
key 17 a light blow. Remove the Allen key from
the keyless chuck and completely unscrew the
keyless chuck.
For machines with key chuck, disassembly is
carried out analogous as described above.
For machines with keyless chuck, an open-end
spanner (size 19 mm) can be applied to the drill
chuck instead of an Allen key.
Mounting the Drill Chuck (see figure G)
The keyless chuck/key type drill chuck is mount-
ed in reverse order.
Remove the steel pin from the drill hole on
the spindle neck after mounting is complet-
ed.
The drill chuck must be tightened with a
tightening torque of approx. 50–55 Nm.
Dust/Chip Extraction
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.
2 609 932 762 | (2.3.10)
. Loosen a tight-seated
Operation
Starting Operation
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
(see figure H)
Actuate the rotational direction switch 3
only when the machine is at a standstill.
The rotational direction switch 3 is used to re-
verse the rotational direction of the machine.
However, this is not possible with the On/Off
switch 6 actuated.
Right rotation: For drilling and driving in
screws, push the rotational direction switch 3
downward on the left side and at the same time
upward on the right side.
Left rotation: For loosening and unscrewing
screws and nuts, push the rotational direction
switch 3 upward on the left side and at the same
time downward on the right side.
Setting the Operating Mode
Drilling and Screwdriving
Set the selector switch 2 to the "Drill-
ing" symbol.
Impact Drilling
Set the selector switch 2 to the "Im-
pact drilling" symbol.
The selector switch 2 engages noticeably and
can also be actuated with the machine running.
Gear Selection, Mechanical
The gear selector 7 can be actuated on ma-
chines running at low speed. However, this
should not be done when the machine is
stopped, at full load or running at maximum
speed.
Bosch Power Tools