# Start-up

- Ensure that the cover (13) of the Bluetooth® Low Energy Module GCY 42 is closed during operation. This will prevent dust from getting in.

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You can use the combi switch (7) to select the operating mode of the power tool.

Note: Only change the operating mode when the power tool is switched off. Otherwise, the power tool may become damaged.

Note: If you switch to a different operating mode while the on/off switch is locked, the power tool will switch off.

- To change the operating mode, turn the combi switch (7) to the required position until you hear it click into place.

Position for hammer drilling in concrete or stone

GBH 18V-34 CF with keyless quick-change chuck (1): Position for drilling without impact in wood, metal, ceramic and plastic (clockwise)

Anticlockwise position for loosening the application tool from the workpiece

Vario-Lock position for changing the chiselling position.

Position for chiselling

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- If necessary, release the lock-on button (9) for the on/off switch.
- To switch on the power tool, press the on/off switch (11).

The lamp 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).

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You can adjust the speed/impact rate of the power tool when it is on by pressing in the on/off switch (11) to varying extents.

Applying light pressure to the on/off switch (11) results in a low rotational speed/impact rate. Applying increasing pressure to the switch increases the speed/impact rate.

You can also control the speed on the user interface and/or via a smartphone app: .

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You can lock the chisel in 16 different positions, so you can select the optimum working position for each task.

- Insert the chisel into the tool holder.
- Turn the combi switch (7) to the "Vario-Lock" position.
- Turn the application tool to the required chisel position.
- Turn the combi switch (7) to the "chiselling" position. With this, the tool holder is locked.

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To chisel for extended periods without pressing the on/off switch (11), lock the on/off switch in "chiselling" operating mode.

- To lock the power tool, press the on/off switch (11) down fully whilst simultaneously pressing the lock-on switch (9).

- To switch the lock off, press the lock-on button (9) again.