Maintenance And Service - Bosch GBH 11 DE Professional Manual Original

OBJ_BUCH-58-003.book Page 19 Tuesday, August 24, 2010 11:14 AM
– Select the speed with the thumbwheel 7 ac-
cording to the material.
The data in the following table are recommend-
ed values.
Operating Hammer Drilling
Mode
Thumb- Rated
wheel 7 Speed
-1
(min )
1 135
2 157
3 184
4 204
5 228
6 252
Safety Clutch
If the tool insert becomes caught or
jammed, the drive to the drill spindle is in-
terrupted. Because of the forces that occur,
always hold the power tool firmly with both
hands and provide for a secure stance.
If the power tool jams, switch the machine
off and loosen the tool insert. When switch-
ing the machine on with the drilling tool
jammed, high reaction torques can occur.
Working Advice
Before any work on the machine itself, pull
the mains plug.
Changing the Chiselling 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 "Chang-
ing the chiselling position (Vario-lock)".
– Turn the tool holder to the desired chiselling
position.
– Press and hold the unlocking button 3 and
turn the mode selector switch 4 to the "Chis-
elling" position. The tool holder is locked in
this position.
Bosch Power Tools

Maintenance and Service

Chisel-
ling
Impact Impact
Maintenance and Cleaning
Rate Rate
-1 -1
(min ) (min )
1240 1240
1440 1440
1680 1680
1880 1880
2080 2080
2300 2300
Service Indicator 8
When the carbon brushes are worn out, the ma-
chine switches itself off. This is indicated ap-
prox. 8 hours beforehand by the lighting or
blinking of the service indicator 8. The machine
must then be sent to an after-sales service
agent. Addresses are listed in the Section "Af-
ter-sales Service and Customer Assistance".
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.
After-sales Service and Customer
Assistance
Our after-sales service responds to your ques-
tions concerning maintenance and repair of your
product as well as spare parts. Exploded views
and information on spare parts can also be
found under:
www.bosch-pt.com
Our customer service representatives can an-
swer your questions concerning possible appli-
cations and adjustment of products and acces-
sories.
The mode selector switch 4 must always be
locked in the "Chiselling" position when
chiselling.
Before any work on the machine itself, pull
the mains plug.
For safe and proper working, always keep
the machine and ventilation slots clean.
A damaged dust protection cap should be
changed immediately. We recommend hav-
ing this carried out by an after-sales serv-
ice.
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