1 609 929 M29 | (10.9.07)
Bosch Power Tools
22
| English
Right rotation:
Press the rotational direction
switch
7
through to the right stop (for drilling
and driving screws).
Left rotation:
Press the rotational direction
switch
7
through to the left stop (for loosening
and unscrewing screws and nuts).
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.
Gear Selection, Mechanical
f
The gear selector 8 can be actuated at stand-
still or when the machine is running. Howev-
er, this should not be done while operating
at full load or maximum speed.
Two speed ranges can be preselected with the
gear selector
8
.
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
8
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
6
and keep it depressed.
To lock the
pressed
On/Off switch
6
, press the
lock-on button
5
.
To
switch off
the machine, release the On/Off
switch
6
or when it is locked with the lock-on but-
ton
5
, briefly press the On/Off switch
6
and then
release it.
Safety Clutch
To limit dangerous reaction torque,
the machine is equipped with a safe-
ty clutch (anti-rotation).
f
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.
f
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.
Upon actuation of the safety clutch, the drilling
spindle comes to a stop and the latching noise of
the safety clutch can be heard.
Switch the ma-
chine off immediately upon actuation of the
safety clutch.
In 1st gear the safety clutch actuates at approx.
33 Nm, in 2nd gear at approx. 13 Nm.
Adjusting the Speed/Impact Frequency
The speed/impact rate of the switched on power
tool can be variably adjusted, depending on how
far the On/Off switch
6
is pressed.
Light pressure on the On/Off switch
6
results in
low speed/impact rate. Further pressure on the
switch increases the speed/impact rate.
Preselecting the Speed/Impact Frequency
With the thumbwheel for speed preselection
3
,
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 determined through practical testing.
Constant Electronic Control (GSB 22-2 RCE)
The constant electronic control keeps the prese-
lected speed and impact rate nearly constant be-
tween no-load and load conditions.
OBJ_BUCH-486-001.book Page 22 Monday, September 10, 2007 9:49 AM
