Dust/Chip Extraction; Switching On/Off - Bosch GBH 18V-26 Professional Manual Original

22 | English
– Hold the retaining ring (28) of the keyless quick-change
chuck firmly in place. Open the tool holder by turning the
front sleeve (27) until the tool can be inserted. Hold the
retaining ring (28) in place and firmly tighten the front
sleeve (27) by turning it in the direction of the arrow until
you hear it click into place.
– Check that it is seated securely by pulling on the tool.
Note: If the tool holder was unscrewed all the way, a scrap-
ing sound may be heard while retightening the tool holder
and it may not fully tighten.
In this case, turn the front sleeve (27) in the opposite direc-
tion to the arrow by one full turn. This will allow the tool
holder to be fully tightened.
– Turn the impact/mode selector switch (16) to the
"drilling" position.
Removing the application tool (see figure J)
– Hold the retaining ring (28) of the keyless quick-change
chuck firmly in place. Open the tool holder by turning the
front sleeve (27) in the direction of the arrow until the
tool can be removed.

Dust/Chip Extraction

The dust from materials such as lead paint, some types of
wood, minerals and metal can be harmful to human health.
Touching or breathing in this dust can trigger allergic reac-
tions and/or cause respiratory illnesses in the user or in
people in the near vicinity.
Certain dusts, such as oak or beech dust, are classified as
carcinogenic, especially in conjunction with wood treatment
additives (chromate, wood preservative). Materials contain-
ing asbestos may only be machined by specialists.
– Use a dust extraction system that is suitable for the ma-
terial wherever possible.
– Provide good ventilation at the workplace.
– It is advisable to wear a P2 filter class breathing mask.
The regulations on the material being machined that apply in
the country of use must be observed.
Avoid dust accumulation at the workplace. Dust can
u
easily ignite.
Dust extraction with GDE 18V-16 (accessory)
(see figure K)
The GDE 18V-16 dust extraction attachment (accessory) is
required for extracting concrete dust and stone dust.
This dust extraction system is not suitable for dust from
wood, metal and plastic or for dust which is harmful to one's
health (e.g. asbestos).
Operation
Start-up
Setting the Operating Mode
The operating mode of the power tool is selected using the
impact/mode selector switch (16).
1 609 92A 6GA | (10.02.2022)
– To change the operating mode, press the release
button (15) and turn the impact/mode selector
switch (16) until it clicks into the required position.
Note: Only change the operating mode when the power tool
is switched off. Otherwise, the power tool may become dam-
aged.
Position for hammer drilling into concrete or
stone
Position for drilling without impact in wood,
metal, ceramic and plastic and for screwdriv-
ing
Vario-Lock position for adjusting the chisel po-
sition
The impact/mode selector switch (16) will not
engage in this position.
Position for chiselling
Setting the Rotational Direction
The rotational direction switch (11) is used to change the ro-
tational direction of the power tool. However, this is not pos-
sible while the on/off switch (13) is being pressed.
Only operate the rotational direction switch (11)
u
when the power tool is not in use.
Always set the rotational direction to clockwise rotation for
hammer drilling, drilling and chiselling.
– Clockwise: Slide the rotational direction switch (11)
all the way to the left.
– Anticlockwise: Slide the rotational direction
switch (11) all the way to the right.

Switching On/Off

– To switch on the power tool, press the on/off switch
(13).
The worklight (17) lights up when the on/off switch (13) is
lightly or fully pressed, allowing the work area to be illumin-
ated in poor lighting conditions.
When switching on the power tool for the first time, the start
may be slightly delayed as the power tool's electronic system
has to configure itself first.
For low temperatures, the power tool reaches the full ham-
mer/impact capacity only after a certain time.
– To switch off the power tool, release the on/off switch
(13).
Adjusting the Speed/Impact Rate
You can adjust the speed/impact rate of the power tool when
it is on by pressing in the on/off switch (13) to varying ex-
tents.
Applying light pressure to the on/off switch (13) results in a
low rotational speed/impact rate. Applying increasing pres-
sure to the switch increases the speed/impact rate.
Bosch Power Tools