Bosch Professional GBH 2-24 DFR Manual Original página 22

22 | English
Operation
Starting Operation
Observe correct mains voltage! The voltage
of the power 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 select-
ed with the mode selector switch 10.
Note: Change the operating mode only when the
machine is switched off! Otherwise, the ma-
chine can be damaged.
To change the operating mode, push the release
button 9 and turn the mode selector switch 10
to the requested position until it can be heard to
latch.
Position for hammer drilling in con-
crete or stone
Position for drilling without impact
in wood, metal, ceramic and plastic
as well as for screwdriving and
thread cutting.
Vario-Lock position for adjustment
of the chiselling position
The mode selector switch 10 does
not latch in this position.
Position for chiselling
1 619 929 739 | (2.8.07)
Reversing the Rotational Direction
The rotational direction switch 14 is used to re-
verse the rotational direction of the machine.
However, this is not possible with the On/Off
switch 7 actuated.
Right rotation: Push the rotation-
al direction switch 14 rightward
to the stop.
Left rotation: Push the rotational
direction switch 14 leftward to
the stop.
Set the direction of rotation for hammer drilling,
drilling and chiselling always to right rotation.
Switching On and Off
To start the machine, press the On/Off switch 7.
To lock the On/Off switch, keep it pressed and
additionally push the lock-on button 8.
In left rotation, the On/Off switch cannot be
locked.
To switch off the machine, release the On/Off
switch 7. When the On/Off switch 7 is locked,
press it first and then release it.
Setting the Speed/Impact Rate
The speed/impact rate of the switched on pow-
er tool can be variably adjusted, depending on
how far the On/Off switch 7 is pressed.
Light pressure on the On/Off switch 7 results in
low speed/impact rate. Further pressure on the
switch increases the speed/impact rate.
Overload Clutch
If the tool insert becomes caught or
jammed, the drive to the drill spindle is in-
terrupted. Because of the forces that occur,
always hold the power tool firmly with both
hands and provide for a secure stance.
If the power tool jams, switch the machine
off and loosen the tool insert. When switch-
ing the machine on with the drilling tool
jammed, high reaction torques can occur.
Bosch Power Tools