Bosch Professional GBH 220 Manual Original página 17

Setting the Operating Mode
The operating mode of the power tool is selected using the
impact/mode selector switch (10).
– To change the operating mode, press the release
button (9) and turn the impact/mode selector
switch (10) 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 screw-
driving
Vario-Lock position for adjusting the chisel
position
The impact/mode selector switch (10) will
not engage in this position.
Position for chiselling
Setting the Rotational Direction (see figure J)
The rotational direction switch (8) is used to change the ro-
tational direction of the power tool. However, this is not pos-
sible while the on/off switch (7) is being pressed.
Only operate the rotational direction switch (8) when
u
the power tool is not in use.
Always set the rotational direction to clockwise rotation for
hammer drilling, drilling and chiselling.
– Clockwise: To drill and to drive in screws, press the rota-
tional direction switch (8) all the way to the left.
– Anticlockwise: To loosen and unscrew screws and nuts,
press the rotational direction switch (8) all the way to the
right.
Switching On/Off
– To switch on the power tool, press the on/off switch (7).
– To lock the on/off switch (7), press and hold it while also
pushing the lock-on button (6).
– To switch off the power tool, release the on/off switch
(7). If the on/off switch (7) is locked, press the switch
first and then release it.
Adjusting the Speed/Impact Rate
– Adjust the speed/impact rate of the power tool when it is
on by pressing in the on/off switch (7) to varying extents.
Applying light pressure to the on/off switch (7) results in a
low rotational speed/impact rate. Applying increasing pres-
sure to the switch increases the speed/impact rate.
Bosch Power Tools
Overload clutch
If the application tool jams or snags, the power trans-
u
mission to the drill spindle will be interrupted. Always
hold the power tool firmly with both hands to with-
stand the forces this may create and adopt a position
with stable footing.
Switch the power tool off immediately and remove the
u
application tool if the power tool becomes blocked.
Switching on when the drilling tool is blocked may
cause high torque reactions.
Practical Advice
Only apply the power tool to the screw/nut when the
u
tool is switched off. Rotating tool inserts can slip off.
Changing the chiselling position (Vario-Lock)
You can lock the chisel in 13 different positions, so you can
select the optimum working position for each task.
– Insert the chisel into the tool holder.
– Turn the impact/mode selector switch (10) to the "Vario-
Lock" position.
– Turn the application tool to the required chisel position.
– Turn the impact/mode selector switch (10) to the "chis-
elling" position. With this, the tool holder is locked.
– Set the rotational direction for chiselling to clockwise.
Chiselling with lock function
To chisel for extended periods without pressing the on/off
switch (7), lock the on/off switch in "chiselling" operating
mode.
– To lock the power tool, press the on/off switch (7) down
fully whilst simultaneously pressing the lock-on
switch (6).
– To switch the lock off, press the lock-on button (6) again.
Note: If you switch to a different operating mode while the
on/off switch is locked, the power tool will switch off.
Inserting screwdriver bits (see figure K)
Only apply the power tool to the screw/nut when the
u
tool is switched off. Rotating tool inserts can slip off.
A universal holder (26) with SDS-plus shank (accessory) is
required to work with screwdriver bits.
– Clean and lightly grease the insertion end of the shank.
– Insert the universal holder into the tool holder while turn-
ing it until it locks automatically.
– Check that it is locked by pulling the universal holder.
– Insert a screwdriver bit in the universal holder. Only use
screwdriver bits that fit the screw head.
– To remove the universal holder, slide the locking sleeve
(5) backwards and remove the universal holder (26)
from the tool holder.
English | 17
1 609 92A 5PD | (20.08.2020)