Bosch Professional GBH 12-52 D Manual Original página 10

OBJ_BUCH-2212-001.book Page 10 Thursday, March 19, 2015 11:53 AM
10 | English
– As far as possible, use a dust extraction system suitable
for the material.
– Provide for good ventilation of the working place.
– It is recommended to wear a P2 filter-class respirator.
Observe the relevant regulations in your country for the
materials to be worked.
 If the application tool should become blocked, switch
the machine off. Loosen the application tool.
 Before switching on the power tool, make sure that the
application tool moves freely. When switching on with a
blocked drilling tool, high torque reaction can occur.
 To save energy, only switch the power tool on when us-
ing it.
 Always wait until the machine has come to a complete
stop before placing it down. The tool insert can jam and
lead to loss of control over the power tool.
 Restarting Protection
In chiselling mode, the restarting protection prevents un-
controlled starting of the machine after a power failure.
– To restart the operation, switch the On/Off switch to
the Off position and start the machine again.
Vibration Damper (GBH 12-52 DV)
The integrated vibration damper reduces occurring vibra-
tions.
Symbols
The following symbols are important for reading and under-
standing the operating instructions. Please take note of the
symbols and their meaning. The correct interpretation of the
symbols will help you to use the machine in a better and safer
manner.
Symbol Meaning
GBH 12-52 D/
GBH 12-52 DV: Rotary Hammer
Grey-marked area: Handle
(insulated gripping surface)
Article number
Read all safety warnings and all
instructions
Before any work on the machine itself,
pull the mains plug from the socket
outlet
Wear protective gloves
1 609 92A 0N3 | (19.3.15)
Symbol Meaning
Always wear ear protection.
Wear safety glasses/goggles
Movement direction
Reaction direction
Next step of action
Prohibited action
Hammer Drilling
Chiselling
Vario-Lock
Switching On
Switching Off
On/Off switch lock-on
Releasing the On/Off switch
Low speed/impact rate
High speed/impact rate
Tool holder
Apply a light coat of grease to the shank
end of the application tool
Service Indicator
P Rated power input
1
E Impact energy per stroke according to
EPTA-Procedure 05/2009
n No-load speed
0
n Impact frequency at no-load
S
Bosch Power Tools