Bosch GFA 12-H Professional Manual Original página 16

16 | English
– Pull out the depth stop until the distance between the tip
of the drill bit and the tip of the depth stop corresponds
with the desired drilling depth X.
Removing the adapter (see figure J)
Remove the application tool.
Unlock the adapter in the direction and pull it off the
holder (1).
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
Inserting the battery
Note: The use of batteries unsuitable for your power tool can
lead to malfunctions or damage to the power tool.
Set the rotational direction switch (6) to the middle position
to avoid unintentionally switching it on. Insert the charged
battery (5) into the handle until you feel it engage and it is
flush with the handle.
Selecting the Drilling or Hammer Drilling Operating
Mode (see figure D)
Set the torque presetting ring (2) to the "drilling" symbol.
Setting the rotational direction (see figure E)
Only operate the rotational direction switch (6) when
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the power tool is not in use.
The rotational direction switch (6) is used to change the ro-
tational direction of the power tool. However, this is not pos-
sible while the on/off switch (7) is being pressed.
Right rotation: To drill and to drive in screws, press the ro-
tational direction switch (6) through to the left stop.
Left Rotation: To loosen and unscrew screws and nuts,
press the rotational direction switch (6) through to the right
stop.
Mechanical gear selection (see figure G)
Only operate the gear selector (3) when the power
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tool is not in use.
1 609 92A 64N | (28.01.2022)
You can preselect two speed ranges with the gear selector
(3).
First gear:
Low speed range; for working with a large drilling diameter
or for screwdriving.
Second gear:
High speed range; for working GFA 12-H.
Always push the gear selector switch as far as it will
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go. Otherwise, the power tool may become damaged.
Switching on/off
To start the power tool, press and hold the on/off switch
(7).
The worklight (9) lights up when the on/off switch (7) is
lightly or fully pressed, allowing the work area to be illumin-
ated in poor lighting conditions.
The worklight (9) will remain lit for approximately ten
seconds after the on/off switch (7) has been released.
Adjusting the Speed
You can adjust the speed of the power tool when it is on by
pressing in the on/off switch (7) to varying extents.
A light pressure on the on/off switch (7) results in a low rota-
tional speed. Increased pressure on the switch causes an in-
crease in speed.
Practical advice
After working at a low speed for an extended period, you
should operate the power tool at the maximum speed for ap-
proximately three minutes without load to cool it down.
Belt clip (see figures K–L)
You can use the belt clip (11) to hang the adapter on a belt,
for example. You then have both hands free and the adapter
is always at hand.
– When fitting it, ensure that the snap-in pin (15) on the
belt clip engages in the recess of the adapter housing.
– To remove the belt clip, lift the snap-in pin (15) using a
sharp object and pull off the belt clip.
Maintenance and Service
Maintenance and Cleaning
Remove the battery from the power tool before carry-
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ing out work on the power tool (e.g. maintenance,
changing tool, etc.). The battery should also be re-
moved for transport and storage. There is risk of injury
from unintentionally pressing the on/off switch.
To ensure safe and efficient operation, always keep
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the power tool and the ventilation slots clean.
After each use, clean the application tool, the hammer
adapter GFA 12-H with tool holder, the ventilation slots of
the power tool and the ventilation slots of the battery.
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
Bosch Power Tools