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19
Bosch Power Tools
1 609 929 V37 | (22/6/10)
Safety Clutch
f
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.
f
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.
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.
– Turn the mode selector switch
3
to the
“Vario-Lock” position (see “Setting the Oper-
ating Mode”, page 18).
– Turn the tool holder to the desired chiselling
position.
– Turn the mode selector switch
3
to the “chis-
elling” position. The tool holder is now
locked.
f
The mode selector switch 3 must always be
locked in the “Chiselling” position when
chiselling.
Working Advice
f
Before any work on the machine itself, pull
the mains plug.
Sharpening Chisels (see figure C)
Good results are only achieved with sharp chis-
els; therefore, sharpen the chiselling tools in
good time. This ensures a long service life of the
tools and good working performance.
–
Re-sharpening
Sharpen chiselling tools using grinding
wheels (e. g. ceramic bonded corundum
wheel) with a steady supply of water. Refer-
ence values are shown in the figure. Take
care that no annealing coloration appears on
the cutting edges; this impairs the hardness
of the chiselling tools.
– For
forging
, heat the chisel to between 850
and 1050 ° C (bright red to yellow).
– For
hardening
, heat the chisel to approx.
900 ° C and quench in oil. Then anneal in an
oven for approx. one hour at 320 ° C (anneal-
ing colour = light blue).
Maintenance and Service
Maintenance and Cleaning
f
Before any work on the machine itself, pull
the mains plug.
f
For safe and proper working, always keep
the machine and ventilation slots clean.
f
A damaged dust protection cap should be
changed immediately. We recommend hav-
ing this carried out by an after-sales serv-
ice.
Lubrication
The power tool is oil-lubricated. An oil change is
required only within the scope of maintenance
or repair through an authorised after-sales serv-
ice agent for Bosch power tools. In this, it is ab-
solutely required to use the specified Bosch oil.
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.
OBJ_BUCH-273-002.book Page 19 Tuesday, June 22, 2010 11:24 AM
