Maintenance And Service; Maintenance And Cleaning - Bosch GSB 20-2 PROFESSIONAL Instructions D'emploi

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OBJ_BUCH-2 609 932 503-001.book Page 6 Tuesday, January 24, 2006 5:06 PM
Constant Electronic Control
(GSB 20-2 RCE/GSB 20-2 RET)
The constant electronic control keeps the preselected
speed and impact rate nearly constant between no-
load and load conditions.
Electronic Torque Limitation/Speed Preselec-
tion (Torque Control) (GSB 20-2 RET)
Drilling with speed preselection: Set
the selector switch 4 to the "Drilling" sym-
bol. The required speed can be selected
with the speed dial 3; it can also be
adjusted during operation.
Screwdriving with torque limitation:
Set the selector switch 4 to the "Screw-
driving" symbol. The effective torque at the
drill spindle can be variable adjusted with
the thumbwheel 3 during operation:
I=low torque, III=high torque.
The maximum speed is automatically
adapted to the adjusted torque.
If the preselected torque is reached during screwdriv-
ing, the machine switches off; the drilling tool no longer
rotates. If the load on the machine is then removed with
the On/Off switch 7 still pressed, the drilling tool con-
tinues 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 limi-
tation, turn the speed dial 3 to the right
stop. This setting is required, when the
torque in position III is not sufficient.
Operating Instructions
Position the machine against the nut/screw only
when it is switched off.
Tips
After longer periods of working at low speed, allow the
machine to cool down by running it for approx. 3 min-
utes at maximum speed with no load.
For drilling in tiles, set the selector switch 2 to the "Drill-
ing" symbol. Do not switch over to the symbol "Impact
Drilling" or work with impact until after drilling through
the tile.
Use carbide tipped drill bits when working in concrete,
masonry and brick wall.
For drilling in metal, use only perfectly sharpened HSS
drill bits (HSS = High Speed Steel). The appropriate
quality is guaranteed by the Bosch accessories pro-
gram.
Twist drills from 2.5–10 mm can easily be sharpened
with the drill bit sharpener (see accessories).
2 609 932 503 • 24.1.06
Soft Grip
The gripping surface (soft grip) 6 reduces the danger
of slipping and thereby improves the grip on the
machine and the handling.
At the same time, the rubber coating achieves a vibra-
tion-reducing effect.

Maintenance and Service

Maintenance and Cleaning

Before any work on the power tool itself, pull the
mains plug.
For safe and proper working, always keep the
power tool and the ventilation slots clean.
If the power tool should fail despite the care taken in
manufacturing and testing procedures, repair should
be carried out by an after-sales service center for
Bosch power tools.
In all correspondence and spare parts orders, please
always include the 10-digit article number given on the
type plate of the power tool.
Service and Customer Assistance
Exploded views and information on spare parts can be
found under:
www.bosch-pt.com
In case of a claim, repair or purchase of replacement
parts or in case of queries or other problems, please
contact your local dealer or Bosch representative.
People's Republic of China
Website: www.bosch-pt.com.cn
China Mainland
Bosch Power Tools (China) Co., Ltd.
567, Bin Kang Road
Bin Jiang District 310052
Hangzhou, P.R.China
Service Hotline: . . . . . . . . . . . . . . . . . . 800 8 20 84 84
✆ . . . . . . . . . . . . . . . . . . . . . . . . +86 571 87 77 43 38
Fax . . . . . . . . . . . . . . . . . . . . . . . . +86 571 87 77 45 02
HK and Macau Special Administrative Regions
Room 1210, Shun Tak Centre, West-Tower,
168 – 200 Connaught Road, Central Hong Kong
Customer Service Hotline: . . . . . . .+852 25 89 15 61
Fax . . . . . . . . . . . . . . . . . . . . . . . . . . . +852 25 48 79 14
E-Mail: bosch@melchers.com.hk
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