8 | English
1 609 92A 2VH | (27.9.16) Bosch Power Tools
Changing the Tool
With the SDS-max tool holder, simpler and easier tool chang-
ing is possible without additional aids.
The dust protection cap 1 largely prevents the penetration of
dust into the tool holder during operation. When inserting the
tool, pay attention that the dust protection cap 1 is not dam-
aged.
A damaged dust protection cap should be changed im-
mediately. We recommend having this carried out by
an after-sales service.
Inserting (see figure A)
– Clean and lightly grease the shank end of the tool.
– Insert the tool in a twisting manner into the tool holder until
it latches itself.
– Check the latching by pulling the tool.
Removing (see figure B)
– Push back the locking sleeve 2 and remove the 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.
Certain dust, such as oak or beech dust, is considered carci-
nogenic, especially in connection with wood-treatment addi-
tives (chromate, wood preservative). Materials containing as-
bestos 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 mate-
rials to be worked.
Operation
Starting Operation
Observe correct mains voltage! The voltage of the pow-
er 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.
Setting the operating mode
The operating mode of the power tool is selected using the
mode selector switch 3.
Note: Change the operating mode only when the machine is
switched off! Otherwise, the machine can be damaged.
– Turn the mode selector switch 3 to the desired position.
In the “chiselling” position, the impact rate preselected with
the thumbwheel 7 is automatically increased when switching
on; this causes the power tool to operate with increased ca-
pacity when chiselling.
Switching On/Off in Drilling Mode
To save energy, only switch the power tool on when using it.
–To start the machine, press the On/Off switch 5 and keep
it pressed.
–To switch off the machine, release the On/Off switch 5.
Switching On/Off in Chiselling Mode
To save energy, only switch the power tool on when using it.
–To start the machine, press the On/Off switch 5 at the top
(I) until it locks.
–To switch off the machine, press the On/Off switch 5 at
the bottom (0) and release it.
For low temperatures, the power tool reaches the full ham-
mer/impact capacity only after a certain time.
Setting the Speed/Impact Rate
The electronic control enables stepless speed and impact
preselection in accordance with the material to be worked.
The constant electronic control keeps the preselected speed
and impact rate nearly constant between no-load and load
conditions.
When plugging the plug into the socket outlet or after a power
failure, the constant electronic control automatically sets the
highest speed and impact rate. This ensures working at opti-
mum performance despite too low preadjustment of the
thumbwheel X.
– Select the impact rate with the thumbwheel X according to
the material.
The data in the following table are recommended values.
Position for hammer drilling
When the drilling tool does not immediately
rotate upon switching on, allow the machine
to run slowly until the drilling tool rotates.
Vario-Lock position for adjustment of the
chiselling position
Position for chiselling
OBJ_BUCH-1787-003.book Page 8 Tuesday, September 27, 2016 1:07 PM
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