Maintenance And Service - Bosch GSH 11 E Manual Original

12 | English
Dust/Chip Extraction
 Dusts from materials such as lead-containing coatings,
some wood types, minerals and metal can be harmful to
one's health. Touching or breathing-in the dusts can cause
allergic reactions and/or lead to respiratory infections of
the user or bystanders.
Certain dusts, such as oak or beech dust, are considered
as carcinogenic, especially in connection with wood-treat-
ment additives (chromate, wood preservative). Materials
containing asbestos may only be worked by specialists.
– Provide for good ventilation of the working place.
– It is recommended to wear a P2 filter-class respirator.
Observe the relevant regulations in your country for the
materials to be worked.
Operation
Starting Operation
 Observe correct mains voltage! The voltage of the pow-
er source must agree with the voltage specified on the
nameplate of the machine. Power tools marked with
230 V can also be operated with 220 V.
Switching On and Off
To start the machine, push the On/Off switch 4 to the right.
To switch off the machine, push the On/Off switch 4 to the
left.
For low temperatures, the machine reaches the full impact
rate only after a certain time.
This start-up time can be shortened by striking the chisel in
the machine against the floor one time.
To save energy, only switch the power tool on when using it.
Setting the Impact Rate
The electronic control enables stepless speed preselection in
accordance with the material to be worked.
The constant electronic control keeps the preselected impact
rate nearly constant between no-load and load conditions.
Select the impact rate with the thumbwheel 5 according to
the material.
Changing the Chiselling Position
The chisel can be locked in 12 positions. In this manner, the
optimum working position can be set for each application.
Insert the chisel into the tool holder.
Push the chisel adjustment ring 3 forward and turn the chisel
to the required position with the chisel adjustment ring 3.
Release the chisel adjustment ring 3 and turn the chisel until
it latches.
Working Advice
 Before any work on the machine itself, pull the mains
plug.
Sharpening Chisels (see figure C)
Good results are only achieved with sharp chisels; therefore,
sharpen the chiselling tools in good time. This ensures a long
service life of the tools and good working performance.
Re-sharpening
Sharpen chiselling tools using grinding wheels (e. g. ceramic
bonded corundum wheel) with a steady supply of water. Ref-
erence values are shown in the figure. Take care that no an-
nealing coloration appears on the cutting edges; this impairs
the hardness of the chiselling tools.
For forging, heat the chisel to between 850 and 1050 °C
(bright red to yellow).
For hardening, heat the chisel to approx. 900 °C and quench
in oil. Then anneal in an oven for approx. one hour at 320 °C
(annealing colour = light blue).

Maintenance and Service

Maintenance and Cleaning
 Before any work on the machine itself, pull the mains
plug.
 For safe and proper working, always keep the machine
and ventilation slots clean.
 A damaged dust protection cap should be changed im-
mediately. We recommend having this carried out by
an after-sales service.
If the replacement of the supply cord is necessary, this has to
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be done by or an authorized
der to avoid a safety hazard.
Service Indicator 6
When the carbon brushes are worn out, the machine switches
itself off. This is indicated approx. 8 hours beforehand by the
lighting or blinking of the service indicator 6. The machine
must then be sent to an after-sales service agent. Addresses
are listed in the Section "After-sales Service and Application
Service".
If the machine should fail despite the care taken in manufac-
turing and testing procedures, repair should be carried out by
an after-sales service centre for
In all correspondence and spare parts order, please always in-
clude the 10-digit article number given on the type plate of
the machine.
After-sales Service and Application Service
Our after-sales service responds to your questions concern-
ing maintenance and repair of your product as well as spare
parts. Exploded views and information on spare parts can al-
so be found under:
www.spit.com
Disposal
The machine, accessories and packaging should be sorted for
environmental-friendly recycling.
Do not dispose of power tools into household waste!
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service agent in or-
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power tools.