Bosch Professional GSB 20-2RE Instrucciones De Servicio página 19

Place the machine on a stable surface (e. g. a workbench).Hold
the machine firmly and loosen the keyless chuck 1 by
turning the Allen key 19 in rotation direction
tight-seated keyless chuck by giving the long end of the Allen
key 19 a light blow. Remove the Allen key from the keyless
chuck and completely unscrew the keyless chuck.
Mounting the Drill Chuck (see figure F)
The keyless chuck/key type drill chuck is mounted in reverse order.
u Remove the steel pin from the drill hole on the spindle
neck after mounting is completed.
The drill chuck must be tightened with a
tightening torque of approx. 50–60 Nm.
Dust/Chip Extraction
u Dusts from materials such as lead-containing coatings,
some wood types, minerals and metal can be harmful to
one's health. Touching or breathing-in the dusts can cause
allergic reactions and/or lead to respiratory infections 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 working place.
– It is recommended to wear a P2 filter-class respirator.
Observe the relevant regulations in your country for the
materials to be worked.
u Prevent dust accumulation at the workplace. Dusts can
easily ignite.
Operation
Starting Operation
u 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 figures G–H)
(GSB 20-2 RE)
Actuate the rotational direction switch 5 only when the
machine is at a standstill . The rotational direction switch
5 is used to reverse the rotational direction of the machine.
However, this is not possible with the On/Off switch 7
actuated.
Right rotation: For drilling and driving in screws, push the
rotational direction switch 5 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 5 upward on the
left side and at the same time downward on the right side.
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Manual GSB 2-20 e GSB 2-20 RE .indd 19
Setting the Operating Mode
. Loosen a
1
The selector switch 4 engages noticeably and can also be
actuated with the machine running.
Gear Selection, Mechanical
u Actuate the gear selector 9 only when the machine is
at a standstill.
u After pushing the gear selector 9, please lightly turn
the drill chuck to make sure the gear has been
changed accordingly.
Two speed ranges can be preselected with the gear selector 9.
Gear I:
Low speed range; for working with large drilling diameter or
for driving in screws.
Gear II:
High speed range; for working with small drilling diameter.
Switching On and Off
To start the machine, press the On/Off switch 7 and keep it
pressed.
To lock the pressed On/Off switch 7, press the lock-on button 6.
To switch off the machine, release the On/Off switch 7 or
when it is locked with the lock-on button 6, briefly press the
On/Off switch 7 and then release it.
Adjusting the Speed/Impact Frequency (GSB 20-2 RE)
The speed/impact rate of the switched on power tool can be
variably adjusted, depending on how far the On/Off switch
7 is pressed.
Light pressure on the On/Off switch 7 results in low speed/
impact rate. Further pressure on the switch increases the
speed/impact rate.
Preselecting the Speed/Impact Frequency (GSB 20-2 RE)
With the thumbwheel for speed preselection 8, the required
speed/impact frequency can be preselected even during
operation.
The required speed/impact frequency depends on the
material and the working conditions, and can be determined
through practical testing.
Working Advice
u Apply the power tool to the screw/nut only when it is
switched off. Rotating tool inserts can slip off.
After longer periods of working at low speed, allow the
machine to cool down by running it for approx. 3minutes at
maximum speed with no load.
For drilling in tiles, set the selector switch 4 to the "Drilling"
symbol. Do not switch over to the symbol "Impact Drilling" or
work with impact until after drilling through the tile.
Use carbide tipped drill bits when working in concrete,
masonry and brick wall.
Drilling and Screwdriving
Set the selector switch 4 to the "Drilling" symbol.
Impact Drilling
Set the selector switch 4 to the "Impact drilling"
symbol.
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19/05/15 12:01