Bosch Professional GSB 18 V-21 Original Instructions Manual page 18

18 | English
Firmly tighten the keyless chuck (2) by turning it by hand in
the direction of rotation ➋. This will automatically lock the
drill chuck.
Dust/Chip Extraction
Dust 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 dust can cause allergic
reactions and/or lead to respiratory infections of the user or
bystanders.
Certain dust, such as oak or beech dust, is considered carci-
nogenic, especially in connection with wood-treatment ad-
ditives (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 ma-
terials to be worked.
Avoid dust accumulation at the workplace. Dust can
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easily ignite.
Operation
Starting Operation
Inserting the battery
Note: The use of batteries unsuitable for your power tool can
lead to malfunctions or damage to the power tool.
Set the rotational direction switch (10) to the middle posi-
tion to avoid unintentionally switching it on. Insert the
charged battery (7) into the handle until you feel it engage
and it is flush with the handle.
Setting the rotational direction (see figure B)
The rotational direction switch (10) is used to change the ro-
tational direction of the power tool. However, this is not pos-
sible while the on/off switch (11) is being pressed.
Right rotation: To drill and to drive in screws, press the ro-
tational direction switch (10) through to the left stop.
Left rotation: To loosen and unscrew screws and nuts,
press the rotational direction switch (10) through to the left
stop.
Setting the operating mode
Drilling
GSR 18V-21:
Set the torque presetting ring (3) to the re-
quired torque.
GSB 18V-21:
Set the mode selector switch (4) to the
"drilling" symbol.
Screwdriving
GSR 18V-21:
Set the torque presetting ring (3) to the "screw-
driving" symbol.
1 609 92A 4SZ | (26.11.2019)
GSB 18V-21:
Set the mode selector switch (4) to the "screw-
driving" symbol.
Impact drilling (GSB 18V-21)
Set the mode selector switch (4) to the "impact
drilling" symbol.
Switching on/off
To start the power tool, press and hold the on/off switch
(11).
The LED (9) lights up when the on/off switch (11) is lightly
or fully pressed, meaning that the work area is illuminated in
poor lighting conditions.
To switch off the power tool, release the on/off switch (11).
Adjusting the Speed
You can adjust the speed of the power tool when it is on by
pressing in the on/off switch (11) to varying extents.
A light pressure on the on/off switch (11) results in a low ro-
tational speed. Increased pressure on the switch causes an
increase in speed.
Pre-selecting the torque
The torque presetting ring (3) can be used to pre-select the
required torque in 20 stages. Once the set torque has been
reached, the application tool will be stopped.
Mechanical gear selection
You can press the gear selector switch (5) with the
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power tool off or on. You should not do this at full load
or maximum torque, however.
First gear:
Low speed range; for working with a large drilling diameter
or for screwdriving.
Second gear:
High speed range; for working with a small drilling diameter.
Temperature-dependent overload protection
In normal conditions of use, the power tool cannot be over-
loaded. If the power tool is overloaded or the battery tem-
perature is not kept within the permitted range, the power
tool switches off and the LED on the power tool flashes. Al-
low the power tool to cool down before you carry on work-
ing.
Protection against deep discharge
The lithium-ion battery is protected against deep discharge
by the "Electronic Cell Protection (ECP)". When the battery
is discharged, the power tool is switched off by means of a
protective circuit: The application tool no longer rotates.
Practical advice
Always slide the gear selector switch or turn the mode
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selector switch as far as it will go. Otherwise, the power
tool may become damaged.
Only apply the power tool to the screw when the tool
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is switched off. Rotating application tools can slip off.
An auxiliary tool can be used to remove the screwdriver bit
or universal bit holder.
Bosch Power Tools