Maintenance And Service - Bosch GSB Professional 12-2 Originalbetriebsanleitung

OBJ_BUCH-1124-004.book Page 15 Wednesday, August 27, 2014 11:05 AM
Right Rotation: For drilling and driving in screws, push the
rotational direction switch 8 left to the stop.
Left Rotation: For loosening or unscrewing screws, push the
rotational direction switch 8 right to the stop.
Setting the torque
With the torque presetting ring 2 the required torque setting
can be preselected in 22 steps. With the correct setting, the
insert tool is stopped as soon as the screw is screwed flush in-
to the material or when the adjusted torque is reached. The
safety clutch is deactivated in the "
drilling.
Select a higher setting or switch to the "
screwing screws.
Setting the operating mode (see figure C)
With the operating mode preselection ring 3, you can select
between drilling/screwdriving and impact drilling.
Drilling and screwdriving
Set the preselection ring 3 to the "Drilling without
impact" symbol.
Impact drilling
Set the preselection ring 3 to the "Impact drilling"
symbol.
In the "Impact drilling" position, the safety clutch is deactivat-
ed and the maximum power is always effective.
Gear selection, mechanical
 Actuate the gear selector 4 only when the machine is at
a standstill.
Two speed ranges can be preselected with the gear selector 4.
Gear I:
Low speed range; for screwdriving or working with large drill-
ing diameter.
Gear II:
High speed range; for working with small drilling diameter.
If the gear selector 4 cannot be pushed through to the stop,
lightly turn the drill chuck with drill bit.
Switching On and Off
To start the machine, press the On/Off switch 9 and keep it
pressed.
To switch off the machine, release the On/Off switch 9.
Adjusting the Speed
The speed of the switched-on power tool can be variably ad-
justed, depending on how far the On/Off switch 9 is pressed.
Light pressure on the On/Off switch 9 results in a low rotation-
al speed. Further pressure on the switch results in an increase
in speed.
Bosch Power Tools
Fully automatic spindle locking (Auto-lock)
When the On/Off switch 9 is not pressed, the drill spindle and
thus the tool holder are locked.
This enables screws to be screwed in, even when the battery
is empty and allows for the machine to be used as a screwdriver.
Run-on Brake
When the On/Off switch 9 is released, the chuck brakes to a
stop, thus preventing the run-on of the tool.
When driving in screws, wait until the screw is screwed in
" position, e. g. for
flush with the material and then release the On/Off switch 9.
By doing so, the head of the screw does not penetrate into the
" symbol when un-
material.
Working Advice
 Apply the power tool to the screw only when it is
switched off. Rotating tool inserts can slip off.
Note: Pay attention that no metal particles enter the power
tool.
After longer periods of working at low speed, allow the ma-
chine to cool down by running it for approx. 3 minutes at max-
imum speed with no load.
For drilling in metal, use only perfectly sharpened HSS drill
bits (HSS=high-speed steel). The appropriate quality is guar-
anteed by the Bosch accessories program.
Before screwing larger, longer screws into hard materials, it is
advisable to predrill a pilot hole with the core diameter of the
thread to approx.

Maintenance and Service

Maintenance and Cleaning
 Before any work on the machine itself (e. g. mainte-
nance, tool change, etc.) as well as during transport
and storage, remove the battery from the power tool.
There is danger of injury when unintentionally actuating
the On/Off switch.
 For safe and proper working, always keep the machine
and ventilation slots clean.
If the machine should fail despite the care taken in manufac-
turing 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 in-
clude the 10-digit article number given on the type plate of
the machine.
After-sales Service and Application Service
Our after-sales service responds to your questions concern-
ing maintenance and repair of your product as well as spare
parts. Exploded views and information on spare parts can al-
so be found under:
www.bosch-pt.com
Bosch's application service team will gladly answer questions
concerning our products and their accessories.
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