Dust/Chip Extraction; Starting Operation; Working Advice; Maintenance And Service - Bosch GBM 350 Professional Notice Originale

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Replacing the Drill Chuck
For machines without spindle lock, the drill chuck must be re-
placed through an authorized after-sales service agent for
Bosch power tools.
The drill chuck must be tightened with a tightening
torque of approx. 25–30 Nm.

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.
 Prevent dust accumulation at the workplace. Dusts can
easily ignite.
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.
Reversing the rotational direction
 Actuate the rotational direction switch 4 only when the
machine is at a standstill.
The rotational direction switch 4 is used to reverse the rota-
tional direction of the machine. However, this is not possible
with the On/Off switch 3 actuated.
– Right Rotation: For drilling and driving in screws, push the
rotational direction switch 4 left to the stop.
– Left Rotation: For loosening and unscrewing screws and
nuts, press the rotational direction switch 4 through to the
right stop.
Switching On and Off
– To start the machine, press the On/Off switch 3 and keep
it pressed.
– To lock the pressed On/Off switch 3, press the lock-on
button 2.
– To switch off the machine, release the On/Off switch 3.
To save energy, only switch the power tool on when using it.
Adjusting the Speed
The speed of the switched-on power tool can be variably ad-
justed, depending on how far the On/Off switch 3 is pressed.
Light pressure on the On/Off switch 3 results in a low rotation-
al speed. Further pressure on the switch results in an increase
in speed.
1 609 92A 19C | (8.4.15)

Working Advice

 Before any work on the machine itself, pull the mains
plug.
 Apply the power tool to the screw/nut only when it is
switched off. Rotating tool inserts can slip off.
Tips
After longer periods of working at low speed, allow the ma-
chine to cool down by running it for approx. 3 minutes at max-
imum speed with no load.
For drilling in metal, use only perfectly sharpened HSS drill
bits (HSS=high-speed steel). The appropriate quality is guar-
anteed by the Bosch accessories program.
Before screwing larger, longer screws into hard materials, it is
advisable to predrill a pilot hole with the core diameter of the
2
thread to approx. / of the screw length.
3

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.
If the replacement of the supply cord is necessary, this has to
be done by Bosch or an authorized Bosch service agent in or-
der to avoid a safety hazard.
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.bosch-pt.com
Bosch's application service team will gladly answer questions
concerning our products and their accessories.
In all correspondence and spare parts orders, please always
include the 10-digit article number given on the nameplate of
the product.
People's Republic of China
China Mainland
Bosch Power Tools (China) Co., Ltd.
567, Bin Kang Road
Bin Jiang District 310052
Hangzhou, P.R.China
Service Hotline: 4008268484
Fax: (0571) 87774502
E-Mail: contact.ptcn@cn.bosch.com
www.bosch-pt.com.cn
Bosch Power Tools