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OBJ_BUCH-701-001.book Page 13 Thursday, April 3, 2008 1:08 PM
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 selected with
the mode selector switch 4.
Note: Change the operating mode only when the
machine is switched off! Otherwise, the machine can
be damaged.
Press and hold the unlocking button 3 and turn the
mode selector switch 4 to the required position.
Position for hammer drilling
When the drilling tool does not imme-
diately 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
Switching On and Off
To start the machine, press the On/Off switch 5 and
keep it depressed.
To switch off the machine, release the On/Off switch
5.
For low temperatures, the machine reaches the full
hammer/impact capacity only after a certain time.
This start-up time can be shortened by striking the
inserted tool insert against the floor one 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.
1 619 929 835 • 3.4.08
The maximum hammering capacity is achieved when
the thumbwheel 6 is set to position "6". For lower
speed settings, the hammering capacity is lower due to
technical reasons.
Select the speed with the thumbwheel 6 according to
the material.
The data in the following table are recommended val-
ues.
Operating
Hammer Drilling
Mode
Thumbwheel
Rated
Impact Rate
6
Speed (rpm)
(bpm)
1
135
1240
2
157
1440
3
184
1680
4
204
1880
5
228
2080
6
252
2300
Safety Clutch
If the tool insert becomes caught or jammed,
the drive to the drill spindle is interrupted.
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 switching
the machine on with the drilling tool jammed,
high reaction torques can occur.
Changing the Chiselling Position (Vario-Lock)
The chisel can be locked in 12 positions. In this man-
ner, the optimum working position can be set for each
application.
Insert the chisel into the tool holder.
Press and hold the unlocking button 3 and turn the
mode selector switch 4 to "Changing the chiselling
position (Vario-lock)".
Turn the tool holder to the desired chiselling position.
Press and hold the unlocking button 3 and turn the
mode selector switch 4 to the "Chiselling" position.
The tool holder is locked in this position.
The mode selector switch 4 must always be
locked in the "Chiselling" position when chis-
elling.
Chiselling
Impact Rate
(bpm)
1240
1440
1680
1880
2080
2300
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