EURO • Printed in Germany • BA 1 619 929 576 • GSH 4 • GB • OSW 02.03
English - 2
■
Use the machine only with the auxiliary
handle 5.
Loosen the handle by turning to the left. Rotate
the auxiliary handle 5 and adapt to the working
position.
Firmly retighten the handle.
■
Before any work on the machine itself, pull
the mains plug.
With the SDS-max tool holder, simpler and easier
tool changing is possible without additional aids.
☞
Grease the shank end of the tool regu-
larly.
The dust protection cap 1 largely prevents the
entry of drilling dust during operation. When in-
serting the tool, take care that the dust protection
cap 1 is not damaged.
A damaged dust protection cap should be
changed immediately. We recommend having
this carried out by an after-sales service.
Inserting (see figure
)
Clean and grease the shank end of the tool.
Insert the tool in a twisting manner into the tool
holder until it locks. Check if it has locked by pull-
ing the tool.
Removing (see figure
)
Push back the locking sleeve 2 of the tool holder
and remove the tool. Let go of the locking
sleeve 2 again.
Observe correct mains voltage: The voltage of
the power source must agree with the voltage
specified on the nameplate of the machine.
Equipment marked with 230 V can also be con-
nected to 220 V.
Switching On and Off
For starting operation of the machine, push the
On/Off switch 4 to the right.
For starting operation of the machine, push the
On/Off switch 4 to the left.
☞
At low temperatures, the machine reaches
full impact rate only after a certain time.
This start-up time can be shortened by
striking the chisel against the floor once.
The chisel can be locked in 12 positions. In this
manner, the optimum working position can be set
for each application.
Slide the chisel adjusting ring 3 forward and hold
firmly. Then turn the chisel with the chisel adjust-
ing ring 3 until the desired position is reached.
Release the chisel adjusting ring 3 and turn the
chisel until it locks into place.
Good results are only achieved with sharp chis-
els, therefore sharpen the chiselling tools regu-
lary. This prolongs the service life of the tools and
ensures good working performance.
Re-sharpening the chiselling tools
Sharpen chiselling tools using grinding wheels
(e. g. ceramic bonded corundum wheel) with a
steady supply of water. Recommended values
are shown in Fig. C. Take care that no annealing
coloration appears on the cutting edges, other-
wise the hardness of the chiselling tools will be
impaired.
Forging and hardening
Forging:
Heat the chisel to between 850 and
1050 °C (bright red to yellow) and
forge.
Hardening: Heat the chisel to 900 °C (bright red)
and quench in oil, then anneal in an
oven for approx. one hour at 320 °C
(annealing colour = light blue).
■
Before any work on the machine itself, pull
the mains plug.
☞
For safe and proper working, always keep
the machine and the ventilation slots clean.
■
Keep the tool holder clean at all times.
Changing the Dust Protection Cap
A damaged dust protection cap should be
changed immediately. We recommend having
this carried out by an after-sales service.
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.
Auxiliary Handle
Changing the Tool
Initial Operation
A
B
Changing the chiselling position
(Vario-lock)
Sharpening Chisels
Maintenance and Cleaning
GSH 4 (576) - Buch Seite 2 Montag, 4. März 2002 12:54 12
8 • 1 619 929 576 • TMS • 28.02.02
