OBJ_BUCH-67-005.book Page 19 Tuesday, November 20, 2007 8:38 AM
Reversing the Rotational Direction
(see figures G–H)
The rotational direction switch 8 is used to re-
verse the rotational direction of the machine.
However, this is not possible with the On/Off
switch 6 actuated.
Right Rotation: For drilling and driving in
screws, push the rotational direction switch 8
left to the stop.
Left Rotation: For loosening and unscrewing
screws and nuts, press the rotational direction
switch 8 through to the right stop.
Setting the Operating Mode
Drilling and Screwdriving
Set the selector switch 4 to the "Drill-
ing" symbol.
Impact Drilling
Set the selector switch 4 to the "Im-
pact drilling" symbol.
The selector switch 4 engages noticeably and
can also be actuated with the machine running.
Switching On and Off
To start the machine, press the On/Off switch 6
and keep it depressed.
To lock the pressed On/Off switch 6, press the
lock-on button 5.
To switch off the machine, release the On/Off
switch 6 or when it is locked with the lock-on
button 5, briefly press the On/Off switch 6 and
then release it.
Adjusting the Speed/Impact Frequency
The speed/impact rate of the switched on pow-
er tool can be variably adjusted, depending on
how far the On/Off switch 6 is pressed.
Light pressure on the On/Off switch 6 results in
low speed/impact rate. Further pressure on the
switch increases the speed/impact rate.
Preselecting the Speed/Impact Frequency
(not for machine version 3 601 B17 103)
With the thumbwheel for speed preselection 7,
the required speed/impact frequency can be
preselected even during operation.
Bosch Power Tools
The required speed/impact frequency depends
on the material and the working conditions, and
can be determined through practical testing.
Working Advice
Apply the power tool to the screw/nut only
when it is switched off. Rotating tool inserts
can slip off.
Tips
After longer periods of working at low speed, al-
low the machine to cool down by running it for
approx. 3 minutes at maximum speed with no
load.
For drilling in tiles, set the selector switch 4 to
the "Drilling" symbol. Do not switch over to the
symbol "Impact Drilling" or work with impact
until after drilling through the tile.
Use carbide tipped drill bits when working in
concrete, masonry and brick wall.
For drilling in metal, use only perfectly sharp-
ened HSS drill bits (HSS=high-speed steel). The
appropriate quality is guaranteed by the Bosch
accessories program.
Twist drills from 2.5–10 mm can easily be
sharpened with the drill bit sharpener (see ac-
cessories).
Maintenance and Service
Maintenance and Cleaning
Before any work on the machine itself, pull
the mains plug.
For safe and proper working, always keep
the machine and ventilation slots clean.
If the machine should fail despite the care taken
in manufacturing and testing procedures, repair
should be carried out by an after-sales service
centre for Bosch power tools.
In all correspondence and spare parts order,
please always include the 10-digit article
number given on the type plate of the machine.
2 609 140 533 | (20.11.07)
English | 19
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