Bosch GGS Professional 28 CE Notice Originale page 8

8 | English
Do not, under any circumstances, tighten the collet
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with the clamping nut until a grinding tool has been
fitted. The collet may otherwise become damaged.
Dust/Chip Extraction
Dust 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 dust can cause allergic
reactions and/or lead to respiratory infections of the user or
bystanders.
Certain dust, such as oak or beech dust, is considered carci-
nogenic, especially in connection with wood-treatment ad-
ditives (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 ma-
terials to be worked.
Avoid dust accumulation at the workplace. Dust can
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easily ignite.
Operation
Starting operation
Products that are only sold in AUS and NZ: Use a resid-
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ual current device (RCD) with a nominal residual current
of 30 mA or less.
Pay attention to the mains voltage. The voltage of the
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power source must match the voltage specified on the
rating plate of the power tool. Power tools marked
with 230 V can also be operated with 220 V.
Switching On and Off
To start the power tool, slide the on/off switch (5) forwards.
To lock the on/off switch (5) in position, push the on/off
switch (5) forwards and down until it clicks into place.
To switch off the power tool, release the on/off switch (5);
or, if the switch is locked, briefly push the on/off switch (5)
backwards and down and then release it.
Kickback Stop
If there is a sudden kickback in the power tool,
e.g. jamming when carving, the power supply
to the motor will be interrupted electronically.
To restart the tool, set the on/off switch (5) to
the off position and then switch the power tool on again.
Constant Electronic control
The Constant Electronic keeps the speed at no load and un-
der load virtually consistent, guaranteeing uniform perform-
ance.
Speed preselection
You can preselect the required speed using the speed
preselection thumbwheel (6), even during operation.
1 609 92A 5T0 | (05.06.2020)
The required speed depends on the material being worked
and the diameter of the application tool. Observe the max-
imal allowable speed of the application tool.
Thumbwheel position No-load speed (min
1 10000
2 12700
3 16700
4 19700
5 23500
6 30000
Practical advice
Move the grinding tool evenly back and forth with light pres-
sure to achieve an optimum work result. Pressure that is too
strong reduces the performance capability of the power tool
and causes the grinding tool to wear more quickly.
Protect the grinding tools against impact.
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Maintenance and Service
Maintenance and Cleaning
Pull the plug out of the socket before carrying out any
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work on the power tool.
To ensure safe and efficient operation, always keep
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the power tool and the ventilation slots clean.
In extreme conditions, always use a dust extractor if
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possible. Blow out ventilation slots frequently and in-
stall a residual current device (RCD) upstream. When
machining metals, conductive dust can settle inside the
power tool, which can affect its protective insulation.
Store and handle the accessories carefully.
In order to avoid safety hazards, if the power supply cord
needs to be replaced, this must be done by Bosch or by an
after-sales service centre that is authorised to repair Bosch
power tools.
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. You can find explosion drawings and information on
spare parts at: www.bosch-pt.com
The Bosch product use advice team will be happy to help you
with any questions about our products and their accessor-
ies.
In all correspondence and spare parts orders, please always
include the 10‑digit article number given on the nameplate
of the product.
Cambodia
Robert Bosch (Cambodia) Co., Ltd
Unit 8BC, GT Tower, 08th Floor, Street 169,
Czechoslovakia Blvd, Sangkat Veal Vong
Khan 7 Makara, Phnom Penh
VAT TIN: 100 169 511
Tel.: +855 23 900 685
-1
)
Bosch Power Tools