Maintenance And Cleaning - Bosch GBH 5-40 DE Instrucciones De Servicio

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 in the tool holder.
Turn the mode selector switch 3 to "Changing
the chiselling position" (Vario-lock).
Turn the tool holder to the desired chiselling posi-
tion.
Allow the mode selector switch 3 to latch in the
"Chiselling" position. The tool holder is locked in
this position.
The mode selector switch 3 must always be
locked in the "Chiselling" position when chis-
elling.
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).

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.
1 619 929 535 • TMS • 22.03.01
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.
Service indicator 7 (red)
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 7. The machine must then
be sent to customer service for maintenance (for
addresses, see Section "Service and Customer
Assistance").
Stand-by-indicator 8 (green)
With the mains plug inserted and mains voltage
available, the stand-by-indicator 8 must light up.
If the machine can not be switched on despite the
lit stand-by-indicator, it must be sent to an author-
ized customer service centre for Bosch power
tools.
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.
English - 4
To be fitted
by qualified
professional only