Bosch GBH 7-45 DE Bedienungsanleitung Seite 14

Sharpening Chisels
Since good results can be achieved only with
sharp chisels, sharpen the chiselling tools regu-
larly. 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 for
this purpose are shown in figure C. Take care that
no annealing coloration appears on the cutting
edges, otherwise 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).
C
60°
4
20°
15°
50°
30° 15°
60°
1 619 929 512 • TMS • 15.09.00
60°
60°
60°
5°
90°
30°
5,0 r
15
2,5 r
53°
Maintenance and Cleaning
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.
If the machine should fail despite the rigorous
manufacturing and testing procedures, repair
should be carried out by an authorised after-sales
service centre for Bosch power tools.
In all correspondence and spare parts orders,
please always include the 10-digit order number
given on the nameplate of the machine.
WARNING! Important instructions for con-
necting a new 3-pin plug to the 2 wire cable.
The wires in the cable are coloured according to
the following code:
strain relief
live = brown
neutral = blue
Do not connect the blue or brown wire to the
earth terminal of the plug.
Important: If for any reason the moulded plug is
removed from the cable of this machine it must be
disposed of safely.
Service Indicator 7
When the carbon brushes are worn out, the ma-
chine switches itself off. This is indicated approx.
eight hours beforehand by the lighting or blinking
45°
of the service indicator 7. The machine must then
be sent to customer service for maintenance (for
addresses, see Section "Service and Customer
Assistance").
Guarantee
We guarantee Bosch appliances in accordance
with statutory/country-specific regulations (proof
of purchase by invoice or delivery note).
Damage attributable to normal wear and tear,
overload or improper handling will be excluded
from the guarantee.
In case of complaint please send the machine,
undismantled, to your dealer or the Bosch Serv-
ice Centre for electric power tools.
English - 4
To be fitted
by qualified
professional only