Operating instructions

1 619 929 732 | (9.8.07) Bosch Power Tools
18 | English
Operation
Starting Operation
f 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 3.
Note: Change the operating mode only when the
machine is switched off! Otherwise, the machine
can be damaged.
Turn the mode selector switch 3 to the requested
position.
In the “chiselling” position, the impact rate
preselected with the thumbwheel 5 is automati-
cally increased when switching on; this causes
the power tool to operate with increased capaci-
ty when chiselling.
Switching On/Off in Drilling Mode
To start the machine, press the On/Off switch 4
and keep it depressed.
To switch off the machine, release the On/Off
switch 4.
Switching On/Off in Chiselling Mode
To start the machine, press the On/Off switch 4
at the top (I) until it locks.
To switch off the machine, press the On/Off
switch 4 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 be-
tween no-load and load conditions.
The maximum hammering capacity is achieved
when the thumbwheel 5 is set to position “6”.
For lower speed settings, the hammering capaci-
ty is lower due to technical reasons.
Select the speed with the thumbwheel 5 accord-
ing to the material.
The data in the following table are recommended
values.
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
Operating
Mode
Hammer Drilling Chiselling
Thumb-
wheel 5
Rated
Speed
(rpm)
Impact
Rate
(bpm)
Impact
Rate
(bpm)
1 145 1350 1375
2 170 1625 1650
3 200 1975 2025
4 225 2175 2225
5 255 2475 2550
6 280 2700 2800
OBJ_BUCH-414-001.book Page 18 Thursday, August 9, 2007 10:45 AM