1 609 929 M09 | (26.9.07)
Bosch Power Tools
20
| English
Changing the Tool
Keyless Chuck (see figure D)
The drill spindle is locked when the On/Off
switch
6
is not pressed. This makes quick, con-
venient and easy changing of the tool in the drill
chuck possible.
Open the keyless chuck
1
by turning in rotation
direction
n
, until the tool can be inserted. Insert
the tool.
Firmly tighten the collar of the keyless chuck
1
by
hand in rotation direction
o
until the locking ac-
tion (“click”) is no longer heard. This automati-
cally locks the chuck.
The locking is released again to remove the tool
when the collar is turned in the opposite direction.
Screwdriver Tools
When working with screwdriver bits
20
, a univer-
sal bit holder
19
should always be used. Use only
screwdriver bits that fit the screw head.
For driving screws, always position the “Drill-
ing/Impact Drilling” selector switch
3
to the
“Drilling” symbol.
Replacing the Drill Chuck
f
For power tools without spindle lock, the
drill chuck must be replaced by an author-
ised after-sales service agent for Bosch pow-
er tools.
Removing the Drill Chuck (see figure E)
Clamp the short end of an Allen key
21
into the
keyless chuck
1
.
Place the machine on a stable surface (e.g. a
workbench). Hold the machine firmly and loosen
the keyless chuck
1
by turning the Allen key
21
in
rotation direction
n
. Loosen a tight-seated key-
less chuck by giving the long end of the Allen key
21
a light blow. Remove the Allen key from the
keyless chuck and completely unscrew the key-
less chuck.
Mounting the Drill Chuck (see figure F)
The keyless chuck is mounted in reverse order.
The drill chuck must be tightened with a
tightening torque of approx. 20–25 Nm.
Operation
Starting Operation
f
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 figure G)
The rotational direction switch
7
is used to re-
verse the rotational direction of the machine.
However, this is not possible with the On/Off
switch
6
actuated.
Right Rotation:
For drilling and driving in screws,
push the rotational direction switch
7
left to the
stop.
Left Rotation:
For loosening and unscrewing
screws and nuts, press the rotational direction
switch
7
through to the right stop.
Setting the Operating Mode
Drilling and Screwdriving
Set the selector switch
3
to the “Drill-
ing” symbol.
Impact Drilling
Set the selector switch
3
to the “Impact
drilling” symbol.
The selector switch
3
engages noticeably and
can also be actuated with the machine running.
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.
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.
OBJ_BUCH-444-001.book Page 20 Wednesday, September 26, 2007 8:12 AM
