10 | English
1 609 929 W80 | (12/10/10) Bosch Power Tools
In the “chiselling” position, the impact rate
preselected with the thumbwheel 7 is automat-
ically increased when switching on; this causes
the power tool to operate with increased capac-
ity when chiselling.
Switching On/Off in Drilling Mode
–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 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 hammer/impact capacity only after a cer-
tain 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 prese-
lected 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 preadjust-
ment of the thumbwheel 7.
– Select the impact rate with the thumbwheel
7 according to the material.
The data in the following table are recommend-
ed values.
Safety Clutch
f 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.
f 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.
Position for hammer drilling
When the drilling tool does not im-
mediately rotate upon switching on,
allow the machine to run slowly un-
til the drilling tool rotates.
Vario-Lock position for adjustment
of the chiselling position
Position for chiselling
Application Thumbwheel
Position
Working roughcast/light
building materials
Removing tiles
Working brick
Working concrete
OBJ_BUCH-512-006.book Page 10 Tuesday, October 12, 2010 11:26 AM
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