Bosch GSH 3 E PROFESSIONAL Instructions D'emploi page 10

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.
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.
Sharpening Chisels
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).
10 • 1 619 929 621 • TMS • 04.03.04
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.
Lubrication
The machine is oil-lubricated. An oil change is
only required during maintenance or repair by an
authorized Bosch After-Sales Service. It is imper-
ative to use the designated 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 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 device/machine, it
must be disposed of safely.
English - 3
To be fitted
by qualified
professional only