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Constant Electronic Control (GSB 21-2 RCT)
The constant electronic control keeps the preselected speed
and impact rate nearly constant between no-load and load
conditions.
Electronic Torque Control/Speed Preselection (GSB
21-2 RCT)
To
drill with speed preselection
, set the se-
lector switch
(4)
to the "drilling" symbol. The
required speed can be selected with the
thumbwheel
(3)
; it can also be adjusted during
operation.
To
drive in screws with torque control
, set
the selector switch
(4)
to the "screwdriving"
symbol. The effective torque at the drill spindle
can be variably adjusted with the thumbwheel
(3)
even during operation:
I
= low torque,
III
= high torque.
The maximum speed is automatically adapted to the adjus-
ted torque.
If the preselected torque is reached during screwdriving, the
machine switches off; the application tool no longer rotates.
If the load on the machine is then removed with the on/off
switch
(7)
still pressed, the application tool continues to run
only at very low speed for safety reasons.
After briefly releasing the on/off switch
(7)
, the next screw
can be driven in with the same torque.
For
screwdriving without torque limitation
,
turn the thumbwheel
(3)
all the way to the
right. This setting is required when the torque
in position
III
is not sufficient.
Practical Advice
u
Pull the plug out of the socket before carrying out any
work on the power tool.
u
Only apply the power tool to the screw/nut when the
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.
To drill into tiles, set the selector switch
(2)
to the "drilling"
symbol. After drilling through the tile, set the selector switch
to the "impact drilling" symbol and drill with impact.
Use carbide drill bits when working with concrete, stone and
masonry.
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.
Using the drill bit sharpener (accessory), you can effortlessly
sharpen twist drill bits with a diameter of 2.5–10 mm.
Maintenance and Service
Maintenance and Cleaning
u
Pull the plug out of the socket before carrying out any
work on the power tool.
u
To ensure safe and efficient operation, always keep
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.
Great Britain
Robert Bosch Ltd. (B.S.C.)
P.O. Box 98
Broadwater Park
North Orbital Road
Denham Uxbridge
UB 9 5HJ
At www.bosch-pt.co.uk you can order spare parts or arrange
the collection of a product in need of servicing or repair.
Tel. Service: (0344) 7360109
E-Mail: [email protected]
Ireland
Origo Ltd.
Unit 23 Magna Drive
Magna Business Park
City West
Dublin 24
Tel. Service: (01) 4666700
Fax: (01) 4666888
Australia, New Zealand and Pacific Islands
Robert Bosch Australia Pty. Ltd.
Power Tools
Locked Bag 66
Clayton South VIC 3169
Customer Contact Center
Inside Australia:
Phone: (01300) 307044
Fax: (01300) 307045
Inside New Zealand:
Phone: (0800) 543353
Fax: (0800) 428570
Outside AU and NZ:
Phone: +61 3 95415555
Bosch Power Tools
1 609 92A 580 | (30.03.2020)
