Auxiliary Handle; Dust/Chip Extraction - Bosch GBH 12-52 D Professional Manual Original

14 | English
power tool and application tools, keeping their hands warm,
and organising workflows correctly.
Assembly
Pull the plug out of the socket before carrying out any
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work on the power tool.

Auxiliary handle

Do not operate your power tool without the auxiliary
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handle (9).
Make sure that the auxiliary handle is always
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tightened. Otherwise you could lose control of the power
tool when working.
Swivelling the Auxiliary Handle
You can swivel the auxiliary handle (9) to any angle for a safe
work posture that minimises fatigue.
– Turn the lower gripping end of the auxiliary handle (9) an-
ticlockwise and swivel the auxiliary handle (9) into the re-
quired position. Then turn the lower gripping end of the
auxiliary handle (9) clockwise to retighten it.
Make sure that the retaining strap of the auxiliary handle
slots into the corresponding groove of the housing.
Selecting drill chucks and tools
For hammer drilling and chiselling, you will need SDS max
tools, which insert into the SDS max drill chuck.
Changing the Tool
The dust protection cap (1) largely prevents the penetration
of drilling dust into the tool holder during operation. When
inserting the tool, make sure that the dust protection cap (1)
does not become damaged.
Replace a damaged dust protection cap immediately.
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It is recommended that you have use an after-sales
service for this.
Changing the Tool (SDS max)
Inserting the Application Tool (see figure A)
With the SDS-max tool holder, you can change the applica-
tion tool simply and easily without additional aids.
– Clean and lightly grease the shank of the application tool.
– Push the locking sleeve (2) back and insert the applica-
tion tool by turning it into the tool holder. Release the
locking sleeve (2) to lock the application tool.
– Check that it is locked by pulling on the tool.
Removing the application tool (see figure B)
– Push the locking sleeve (2) back and remove the applica-
tion tool.

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.
1 609 92A 747 | (25.05.2022)
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
Products that are only sold in AUS and NZ: Use a resid-
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ual current device (RCD) with a nominal residual current
of 30 mA or less.
Start-up
Pay attention to the mains voltage. The voltage of the
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power source must match the voltage specified on the
rating plate of the power tool. Power tools marked
with 230 V can also be operated with 220 V.
Setting the Operating Mode
The operating mode of the power tool is selected using the
mode selector switch (3).
– To change the operating mode, turn the mode selector
switch (3) to the required position.
Note: Only change the operating mode when the power
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tool is switched off. Otherwise, the power tool may be-
come damaged.
Position for hammer drilling
If the application tool does not start rotating
straight away, run the power tool slowly until
the application tool starts rotating.
Vario-Lock position for changing the chiselling
position
Position for chiselling
Switching On and Off in Drilling Mode
– To start the power tool, press the on/off switch (6) and
keep it pressed.
– To switch off, release the on/off switch (6).
Switching On and Off in Chiselling Mode
– To start the power tool, push the on/off switch (6) up-
wards (I) until it locks in place.
Bosch Power Tools