Maintenance And Service; Maintenance And Cleaning - Bosch Professional GBH 11 DE Notice Originale

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OBJ_BUCH-93-002.book Page 10 Monday, August 6, 2007 8:38 AM
10 | English
Switching On and Off
To start the power tool, press the On/Off switch
5 and keep it pressed.
To switch off the power tool, release the On/Off
switch 5.
For low temperatures, the power tool reaches
the full hammer/impact capacity only after a cer-
tain time.
This start-up time can be shortened by striking
the inserted tool insert against the floor one
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 dial control 6 is set to position "6". For
lower speed settings, the hammering capacity is
lower due to technical reasons.
Select the speed with the dial control 6 accord-
ing to the material.
The data in the following table are recommended
values.
Operating Hammer Drilling
Mode
Dial control 6 Rated Impact
Speed Rate
(rpm) (bpm)
1 135 1240
2 157 1440
3 184 1680
4 204 1880
5 228 2080
6 252 2300
Overload Clutch
If the tool insert becomes caught or jammed,
the drive to the drill spindle is interrupted.
Because of the forces that occur, always
hold the power tool firmly with both hands
and provide for a secure stance.
1 619 929 756 | (6.8.07)
If the power tool jams, switch the machine
off and loosen the tool insert. When switch-
ing the power tool on with the drilling tool
jammed, high reaction torques can occur.
Changing the Chiseling Position (Vario-Lock)
The chisel can be locked in 12 positions. In this
manner, the optimum working position can be
set for each application.
Insert the chisel into the tool holder.
Press and hold the unlocking button 3 and turn
the mode selector switch 4 to "Changing the
chiseling position (Vario-lock)".
Turn the tool holder to the requested chiseling
position.
Press and hold the unlocking button 3 and turn
the mode selector switch 4 to the "Chiseling"
position. The tool holder is locked in this posi-
tion.
The mode selector switch 4 must always be
locked in the "Chiselling" position when
chiselling.

Maintenance and Service

Maintenance and Cleaning

Chiseling
Before any work on the power tool itself,
pull the mains plug.
Impact
For safe and proper working, always keep
Rate
the power tool and the ventilation slots
(bpm)
clean.
1240
A damaged dust protection cap should be
1440
changed immediately. We recommend hav-
1680
ing this carried out by an after-sales service.
1880
Service Indicator 7
2080
When the carbon brushes are worn out, the pow-
2300
er tool switches itself off. This is indicated ap-
prox. 8 hours beforehand by the lighting or blink-
ing of the service indicator 7. The power tool
must then be sent to an after-sales service agent.
Addresses are listed in the Section "After-sales
service and customer assistance".
Bosch Power Tools