Bosch GBH 7-46 DE PROFESSIONAL Bedienungsanleitung Seite 15

Sharpening Chisels
Good results are only achieved with sharp chis-
els, therefore sharpen the chiselling tools in good
time. 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. Reference values are
shown in Fig. C. Take care that no annealing col-
oration appears on the cutting edges, otherwise
the hardness of the chiselling tools will be im-
paired.
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 an-
neal in an oven for approx. one
hour at 320 °C (annealing col-
our = light blue).
15 • 1 619 929 668 • 04.07
Maintenance and Cleaning
Before any work on the machine itself, pull the
mains plug.
For safe and proper working, always keep the
machine and its 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.
Service Indicator 6
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
of the service indicator 6. The machine must then
be sent to customer service for maintenance (for
addresses, see Section "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 authorized after-sales
service centre for Bosch power tools.
In all correspondence and spare parts orders,
please always include the 10-digit article 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.
English - 6
To be fitted
by qualified
professional only