Bosch GAC 250 (0.601.2B6.020) - Инструкция по эксплуатации - Страница 21

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21

The service life of the saw chain relies heavily on it being ten-
sioned correctly.
Do not tension the saw chain if it is strongly heated because
it will tighten once it has cooled down and it will fit too tightly
on the chain bar.
– Set down the power tool on a level surface.
– Turn the lock-on button 

(11)

 in the 

 direction in order

to release the fixed chain bar.

– Check whether the chain links are correctly positioned in

the guide slot of the chain bar 

(9)

 and on the sprocket

wheel 

(17)

.

– Turn the tension wheel 

(13)

 in the 

+

 direction until the

correct chain tension has been reached. The latching
mechanism stops the chain tension from being released.
If the tension wheel 

(13)

 is hard to turn, you must con-

tinue to loosen the lock-on button 

(11)

 in the 

 direc-

tion. The lock-on button 

(11)

 can also rotate if the tension

wheel 

(13)

 is set. Two hands may be required to hold the

lock-on button 

(11)

 in position while setting the tension

wheel 

(13)

.

– The saw chain 

(8)

 is tensioned correctly if it can be lifted

in the middle by approx. 3–4 mm. This should be done
with one hand by pulling up the saw chain against the
power tool's own weight.

– If the saw chain 

(8)

 is tensioned excessively, turn the ten-

sion wheel 

(13)

 in the 

–

 direction.

– When the saw chain 

(8)

 is tensioned, secure the chain

bar 

(9)

 by turning the lock-on button 

(11)

 in the 

 direc-

tion. Do not use a tool to do this.

Dust/chip extraction

Dust from materials can be harmful to health. Touching or
breathing in this dust can trigger allergic reactions and/or
cause respiratory illnesses in the user or in people in the
near vicinity. 
Certain dusts are classified as carcinogenic.
– Use a dust extraction system that is suitable for the ma-

terial wherever possible.

– Provide good ventilation at the workplace.
– It is advisable to wear a P2 filter class breathing mask.

u

Avoid dust accumulation at the workplace. 

Dust can

easily ignite.

External Dust Extraction (see figure I)

Insert the extraction hose 

(20)

 with adapter into the extrac-

tion outlet 

(15)

. Connect the dust extraction hose to a dust

extractor (accessory). You will find an overview of how to
connect to various dust extractors at the end of these oper-
ating instructions.
The power tool can be directly connected to the socket of a
Bosch all-purpose dust extractor with remote starter. This
dust extractor is started up automatically when the power
tool is switched on.
The dust extractor must be suitable for the material being
worked.

When extracting dry dust or dust that is especially detri-
mental to health or carcinogenic, use a special dust ex-
tractor.

Operation

Starting Operation

u

Pay attention to the mains voltage! The voltage of the
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.

u

Products that are only sold in AUS and NZ:

 Use a resid-

ual current device (RCD) with a nominal residual current
of 30 mA or less.

Switching On and Off

Pull the hand guard/lever for activating the front
brake

(4)

from position

to position

in the direction

of the front handle

(3)

(see figure

E). If you have not op-

erated the hand guard/lever for activating the front
brake

(4), the front brake has not been deactivated be-

fore use and the power tool will not start up.

Remove the chain guard 

(7)

.

Hold the power tool as described in the "Working with the
Power Tool" section.
To 

start

 the power tool, 

first

 press the lock-off button 

(14)

,

then

 press and hold the on/off switch 

(2)

.

If the power tool is running, you can release the lock-off func-
tion.
To 

switch off

 the power tool, release the on/off switch 

(2)

.

Note:

 For safety reasons, the on/off switch 

(2)

 cannot be

locked; it must remain pressed throughout operation.

Note:

 Do not slow down the power tool by activating the

front brake 

(4)

.

Run-Out Brake/Front Brake (see figure E)

The power tool is fitted with two protective devices:
The 

run-out brake

 slows down the saw chain after the on/off

switch 

(2)

 is released.

The 

front brake

 is a protective mechanism that is triggered

via the lever for activating the front brake 

(4)

 if the power

tool kicks back or the on/off switch fails. The saw chain stops
immediately.
Perform a function test from time to time. Push the lever for
activating the front brake 

(4)

 forwards (position 

) and

briefly switch on the power tool. The saw chain must not
start up. To unlock the front brake again, pull the lever for ac-
tivating the front brake 

(4)

 back again (position 

).

Do not carry the power tool by the lever for activating the
front brake.

Bosch Power Tools

1 609 92A 6BF | (25.10.2022)