Bosch Professional GBM 400 Original Instructions Manual page 8

8 | English
Avoid dust accumulation at the workplace. Dust can
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easily ignite.
Operation
Starting Operation
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.
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.
Reversing the Rotational Direction
Only operate the rotational direction switch (4) when
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the power tool is not in use. Otherwise it may become
damaged.
The rotational direction switch (4) is used to change the ro-
tational direction of the power tool. However, this is not pos-
sible while the on/off switch (3) is being pressed.
Right rotation: To drill and to drive in screws, press the ro-
tational direction switch (4) through to the left stop.
Left Rotation: To loosen and unscrew screws and nuts,
press the rotational direction switch (4) through to the right
stop.
Switching On/Off
To start the power tool, press and hold the on/off switch
(3).
Press the lock-on button (2) to lock the on/off switch (3) in
this position.
To switch off the power tool, release the on/off switch (3).
Adjusting the speed
You can adjust the speed of the power tool when it is on by
pressing in the on/off switch (3) to varying extents.
A light pressure on the on/off switch (3) results in a low rota-
tional speed. Increased pressure on the switch causes an in-
crease in speed.
Practical advice
Pull the plug out of the socket before carrying out any
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work on the power tool.
Only apply the power tool to the screw/nut when the
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tool is switched off. Rotating tool inserts can slip off.
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.
When drilling into metal, only use sharpened HSS drills (HSS
= high-speed steel) which are in perfect condition. The
Bosch accessory range guarantees appropriate quality.
Before screwing larger, longer screws into hard materials, it
is advisable to pre-drill a pilot hole with the core diameter of
the thread to approx. 2/3 of the screw length.
1 609 92A 7YY | (08.09.2022)
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 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.
Malaysia
Robert Bosch Sdn. Bhd.(220975-V) PT/SMY
No. 8A, Jalan 13/6
46200 Petaling Jaya
Selangor
Tel.: (03) 79663194
Toll-Free: 1800 880188
Fax: (03) 79583838
E-Mail: kiathoe.chong@my.bosch.com
www.bosch-pt.com.my
You can find further service addresses at:
www.bosch-pt.com/serviceaddresses
Disposal
The power tool, accessories and packaging should be re-
cycled in an environmentally friendly manner.
Do not dispose of power tools along with
household waste.
Bosch Power Tools