Starting Operation - Bosch GSB 20-2 PROFESSIONAL Instructions D'emploi

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OBJ_BUCH-2 609 932 503-001.book Page 5 Tuesday, January 24, 2006 5:06 PM
Operation

Starting Operation

Observe correct mains voltage! The voltage of the
power source must agree with the voltage specified on
the type plate of the power tool.
Reversing the Rotational Direction
(see figures G–H) (GSB 20-2 RE/GSB 20-2 RCE/
GSB 20-2 RET)
Actuate the rotational direction switch 5 only
when the machine is at a standstill.
The rotational direction switch 5 is used to reverse the
rotational direction of the machine. However, this is not
possible with the On/Off switch 7 actuated.
Right rotation: For drilling and driving in screws, push
the rotational direction switch 5 downward on the left
side and at the same time upward on the right side.
Left rotation: For loosening and unscrewing screws
and nuts, push the rotational direction switch 5 upward
on the left side and at the same time downward on the
right side.
Setting the Operating Mode
Drilling and Screwdriving
Set the selector switch 2 to the "Drilling"
symbol.
Hammer Drilling
Set the selector switch 2 to the "Hammer
drilling" symbol.
The selector switch 2 engages noticeably and can also
be actuated with the machine running.
Gear Selection, Mechanical
The gear selector 10 can be actuated at standstill or
when the machine is running. However, this should not
be done while operating at full load or maximum speed.
Two speed ranges can be preselected with the gear
selection lever 10.
Gear I:
Low speed range; for working with large
drilling diameter or for driving in screws.
Gear II:
High speed range; for working with small
drilling diameter.
If the gear selection lever 10 cannot be fully engaged,
lightly rotate the drill bit by twisting the drill chuck.
2 609 932 503 • 24.1.06
Switching On and Off
To start the power tool, press the On/Off switch 7 and
keep it pressed.
To lock the pressed On/Off switch 7, press the lock-
on button 9.
To switch off the power tool, release the On/Off
switch 7 or when it is locked with the lock-on button 9,
briefly press the On/Off switch 7 and then release it.
Overload Clutch
To limit dangerous reaction torque, the
machine is equipped with a safety clutch
(anti-rotation).
If the tool insert becomes caught or jammed, the drive
to the drill spindle is interrupted. Because of the forces
that occur, always hold the power tool firmly with
both hands and provide for a secure stance.
If the power tool jams, switch the machine off
and loosen the tool insert. When switching the
power tool on with the drilling tool jammed, high reac-
tion torques can occur.
Adjusting the Speed/Impact Frequency
(GSB 20-2 RE/GSB 20-2 RCE/GSB 20-2 RET)
Depending on the pressure applied on the On/Off
switch 7, the speed/impact rate can be adjusted vari-
ably.
Light pressure on the On/Off switch 7 results in low
speed/impact rate. Further pressure on the switch
increases the speed/impact rate.
Preselecting the Speed/Impact Frequency
(GSB 20-2 RE)
With the dial control for speed preselection 8, the
required speed/impact frequency can be preselected
even during operation.
The required speed/impact frequency depends on the
material and the working conditions, and can be deter-
mined through practical testing.
Electronic Speed Preselection
(GSB 20-2 RCE/GSB 20-2 RET)
With the speed dial for electronic speed preselection
3, the required speed/impact frequency can be
selected even if the machine is running.
The required speed/impact frequency depends on the
material and the working conditions, and can be deter-
mined through practical testing.
English–5