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20 | English
Operation
Starting Operation
Observe correct mains voltage! The voltage of the pow-
er 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.
Switching On and Off
To start the power tool, push the On/Off switch 1 forwards.
To lock the On/Off switch 1, press the On/Off switch 1 down
at the front until it latches.
To switch off the power tool, release the On/Off switch 1 or,
if it is locked, briefly push down the back of the On/Off switch
1 and then release it.
Check grinding tools before using. The grinding tool
must be mounted properly and be able to move freely.
Carry out a test run for at least one minute with no load.
Do not use damaged, out-of-centre or vibrating grinding
tools. Damaged grinding tools can burst and cause injuries.
To save energy, only switch the power tool on when using it.
Restarting Protection
The restarting protection feature prevents uncontrolled re-
starting of the machine after an interruption in the power sup-
ply.
To restart the operation, switch the On/Off switch 1 to the
Off position and start the machine again.
Note: Check the function of the restarting protection feature
regularly by having the mains plug pulled during operation
and plugged in again afterwards.
Reduced starting current
The electronic reduced starting current limits the power con-
sumption when switching the tool on and enables operation
from a 13 ampere fuse.
Constant Electronic Control
Constant electronic control holds the speed constant at no-
load and under load, and ensures uniform working perfor-
mance.
Overload Protection
When overloaded, the motor comes to a stop. Relieve the load
on the machine immediately and allow to cool down for ap-
prox. 30 seconds at the highest no-load speed.
Grinding close to the edge (GBR 15 CAG) (see figure B)
For grinding close to the edge, slide the locking device 7 for-
wards () and swing the movable part of the guard 6 side-
ways (). Lock the locking device 7 ( ).
Working Advice
Clamp the workpiece if it does not remain stationary
due to its own weight.
Do not strain the machine so heavily that it comes to a
standstill.
Do not touch diamond cup wheels before they have
cooled. Diamond cup wheels become very hot while work-
ing.
3 609 929 C68 | (11.9.13)
Apply the power tool to the workpiece only when switched on.
Move the machine with a circular motion or alternately in
length and crosswise direction over the workpiece/surface
applying moderate pressure. For removal of coatings, the ma-
chine can also be guided at a small angle to the workpiece sur-
face without a reduction of the dust extraction capacity.
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.
In extreme conditions, always use dust extraction as
far as possible. Blow out ventilation slots frequently
and install a residual current device (RCD). When work-
ing metals, conductive dust can settle in the interior of the
power tool. The total insulation of the power tool can be im-
paired.
A blunt diamond cup wheel 15 can be reground by briefly
grinding abrasive material (e.g. lime-sand brick).
Please store and handle the accessory(-ies) carefully.
If the replacement of the supply cord is necessary, this has to
be done by Bosch or an authorized Bosch service agent in or-
der to avoid a safety hazard.
Changing the Brush Collar
To ensure optimal dust extraction, change a worn brush collar
in good time.
GBR 15 CA: Using a screwdriver, carefully pry out the brush
collar 11 at the openings of the brush guide with the diamond
cup wheel 15 mounted. Use the diamond cup wheel for lever-
age while prying out.
Carefully push a new brush collar 11 to the stop into the brush
guide. When inserting the new brush collar, pay attention that
the ends of the brush collar are not positioned in one of the
openings of the brush guide.
GBR 15 CAG (see figure C): Press (for example with a screw-
driver) into both openings 5 of the guard. You can remove
both parts of the brush collar 4 from under the machine.
Carefully push the two new parts of the brush collar 4 to the
stop into the brush guide. When inserting the new brush col-
lar, pay attention that the ends of the brush collar are not po-
sitioned in one of the openings of the brush guide.
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.
In all correspondence and spare parts order, please always in-
clude the 10-digit article number given on the type plate of
the machine.
Bosch Power Tools
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