Bosch GSB 20-2 Professional Notice Originale page 23

Mounting the Drill Chuck (see figure F)
The keyless chuck is mounted in reverse order.
Remove the steel pin from the drill hole on
the spindle neck after mounting is complet-
ed.
The drill chuck must be tightened with a
tightening torque of approx. 35–40 Nm.
Operation
Starting Operation
Observe correct mains voltage! The voltage
of the power 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
(see figures G–H)
(GSB 20-2 RE/GSB 20-2 RCE/GSB 20-2 RET)
Actuate the rotational direction switch 5 on-
ly when the machine is at a standstill.
The rotational direction switch 5 is used to re-
verse 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 "Drill-
ing" symbol.
Impact Drilling
Set the selector switch 2 to the "Impact
drilling" symbol.
The selector switch 2 engages noticeably and
can also be actuated with the machine running.
Bosch Power Tools
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 op-
erating at full load or maximum speed.
Two speed ranges can be preselected with the
gear selector 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 selector 10 cannot be fully engaged,
lightly rotate the drive spindle with the drill bit by
twisting the drill chuck.
Switching On and Off
To start the machine, press the On/Off switch 7
and keep it depressed.
To lock the pressed On/Off switch 7, press the
lock-on button 9.
To switch off the machine, release the On/Off
switch 7 or when it is locked with the lock-on but-
ton 9, briefly press the On/Off switch 7 and then
release it.
Safety Clutch
To limit dangerous reaction torque,
the machine is equipped with a safe-
ty 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 switch-
ing the machine on with the drilling tool
jammed, high reaction torques can occur.
English | 23
1 609 929 M38 | (11.9.07)