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Set the torque selector setting ring (3) to the
required torque.
GSB 120-LI:
Set the mode selector switch (4) to the "screw-
driving" symbol.
Set the torque selector setting ring (3) to the
required torque.
Impact drilling
GSB 120-LI:
Set the mode selector switch (4) to the "impact
drilling" symbol.
Preselecting torque (applies to screwdriving mode)
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 tool will stop delivering power to the applica-
tion.
Mechanical gear selection
Only operate the gear selector (5) when the power
u
tool is not in use.
You can preselect two speed ranges with the gear selector
(5).
Gear I:
Low speed range; for screwdriving or working with a large
drilling diameter.
Gear II:
High speed range; for working with a small drilling diameter.
If the gear selector switch (5) cannot be pushed all the way,
turn the tool holder (1) with the application tool slightly.
Switching on/off
To start the power tool, press and hold the on/off switch
(10).
The lamp (11) lights up when the on/off switch (10) 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 (10).
LED worklight with status indicator
The LED worklight is used as a status indicator for
device protection and low battery status:
LED Feed-
Description
back
Flashing light
Battery status is low. The voltage level of the
3x
battery has fallen below the optimum value.
during opera-
The performance of the device is restricted.
tion
– If the battery status is low, charge the battery or replace
the weak battery with a fully charged battery.
Adjusting the speed
You can adjust the speed of the power tool when it is on by
pressing in the on/off switch (10) to varying extents.
Bosch Power Tools
A light pressure on the on/off switch (10) results in a low ro-
tational speed. Increased pressure on the switch causes an
increase in speed.
Setting the speed/impact rate (GSB 120-LI)
You can adjust the speed/impact rate of the power tool when
it is on by pressing in the on/off switch (10) to varying ex-
tents.
Applying light pressure to the on/off switch (10) results in a
low rotational speed/impact rate. Applying increasing pres-
sure to the switch increases the speed/impact rate.
Fully automatic spindle lock (Auto-Lock)
The drill spindle, and therefore the tool holder (1), are
locked when the on/off switch (10) is not pressed.
This enables screws to be screwed in even when the battery
(8) is empty and allows the power tool to be used as a
screwdriver.
Run-out brake
Upon releasing the on/off switch (10), the drill chuck is
slowed down, which prevents the application tool from con-
tinuing to rotate.
When driving in screws, you should therefore only release
the on/off switch (10) once the screw has been inserted
flush into the workpiece. This way, the head of screw will not
penetrate the workpiece.
Practical advice
Only apply the power tool to the screw/nut when the
u
tool is switched off. Rotating tool inserts can slip off.
After working at a low speed for an extended period, you
should operate the power tool at the maximum speed for ap-
proximately three minutes without load to cool it down.
When drilling into metal, only use sharpened HSS drills (HSS
= high-speed steel) which are in perfect condition. The
Bosch accessory range guarantees appropriate quality.
Before screwing larger, longer screws into hard materials, it
is advisable to pre-drill a pilot hole with the core diameter of
the thread to approx. 2/3 of the screw length.
Maintenance and Service
Maintenance and Cleaning
Remove the battery from the power tool before carry-
u
ing out work on the power tool (e.g. maintenance,
changing tool, etc.). The battery should also be re-
moved for transport and storage. There is risk of injury
from unintentionally pressing the on/off switch.
To ensure safe and efficient operation, always keep
u
the power tool and the ventilation slots clean.
After-Sales Service and Application Service
Our after-sales service responds to your questions concern-
ing maintenance and repair of your product as well as spare
parts. You can find explosion drawings and information on
spare parts at: www.bosch-pt.com
English | 17
1 609 92A 7XA | (17.11.2022)
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