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19
Bosch Power Tools
1 609 92A 1FH | (27.8.15)
A plastic part (O-ring) is fitted around
the centring collar of mounting flange
14
.
If the O-ring is missing or dam-
aged,
the mounting flange
14
must be
replaced before resuming operation.
Place the diamond cup wheel
15
on the mounting flange
14
.
Pay attention that the direction-of-rotation arrow on the dia-
mond cup wheel agrees with the direction-of-rotation arrow
on the guard and extraction hood
3
.
Press the spindle lock button
9
to lock the grinding spindle.
Screw on the clamping nut
16
and tighten it with the two-pin
spanner
18
.
Pay attention that the collar of the clamping nut
16
faces away
from the machine, as shown in the figure.
After mounting the diamond cup wheel and before
switching on, check that the diamond cup wheel is cor-
rectly mounted and that it can turn freely. Make sure
that the diamond cup wheel does not graze against the
guard and extraction hood or other parts.
Changing a Diamond Cup Wheel
When transporting the machine, the diamond cup wheel
15
should be removed to avoid damage to it.
Do not touch diamond cup wheels before they have
cooled.
Diamond cup wheels become very hot while work-
ing.
Press the spindle lock button
9
to lock the grinding spindle.
Actuate the spindle lock button only when the grinder
spindle is at a standstill.
Otherwise, the machine may be-
come damaged.
Loosen the clamping nut
16
with the two-pin spanner
18
and
unscrew the clamping nut. Remove the diamond cup wheel
15
.
Quick-clamping Nut
For convenient changing of grinding tools without the use of
additional tools, you can use the quick-clamping nut
17
in-
stead of the clamping nut
16
.
Use only a flawless, undamaged quick-clamping nut 17.
When screwing on, pay attention that the side of the
quick-clamping nut 17 with printing does not face the
diamond cutting disc; the arrow must point to the index
mark 19.
Lock the grinder spindle
with the spindle lock button
9
. To tighten the quick-
clamping nut, firmly turn
the diamond wheel disc in
clockwise direction.
A properly attached, un-
damaged quick-clamping
nut can be loosened by
hand when turning the
knurled ring in anticlock-
wise direction.
Never loos-
en a tight quick-clamping
nut with pliers. Always use the two-pin spanner 18.
Dust 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 car-
cinogenic, especially in connection with wood-treatment
additives (chromate, wood preservative). Materials con-
taining asbestos may only be worked by specialists.
– To achieve a high degree of dust extraction, use the
GAS 50 MS vacuum cleaner for mineral dust together
with this power tool.
– 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.
Prevent dust accumulation at the workplace.
Dust can
easily ignite.
The vacuum cleaner must be approved for the extraction of
masonry dust. Bosch provides suitable vacuum cleaners.
Insert a vacuum hose
10
(accessory) into the vacuum connec-
tion
8
. Connect the vacuum hose
10
to a vacuum cleaner (ac-
cessory). An overview for connecting to a vacuum cleaner can
be found at the end of these instructions.
Notes for the Use of Concrete Grinders
Please observe the following notes in order to reduce the dust
emissions occurring while working.
– Only use combinations of diamond cutting discs, concrete
grinders with mounted guard and extraction hood as well
as dust category M vacuum cleaners that are recommend-
ed by Bosch. Other combinations can lead to insufficient
dust collection and separation.
– Observe the operating instructions of the vacuum cleaner
for maintenance and cleaning of the vacuum cleaner, in-
cluding the filter. Empty dust collection containers imme-
diately once full. Clean the filters of the vacuum cleaner
regularly and always insert the filters completely into the
vacuum cleaner.
19 17
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