Bosch 12-2 Original Instructions Manual page 19

Dr. Egbert Schneider
Senior Vice President
Engineering
Robert Bosch GmbH, Power Tools Division
D-70745 Leinfelden-Echterdingen
14.04.2009
Assembly
Battery Charging
A battery that is new or has not been used for a
longer period does not develop its full capacity
until after approx. 5 charging/discharging cy-
cles.
To remove the battery 6 press the unlocking but-
tons 7 and pull out the battery downwards. Do
not exert any force.
The battery is equipped with a NTC temperature
control which allows charging only within a tem-
perature range of between 0 °C and 45 °C. A
long battery service life is achieved in this man-
ner.
A significantly reduced working period after
charging indicates that the battery is used and
must be replaced.
Observe the notes for disposal.
Changing the Tool (see figure A)
Before any work on the machine (e. g.,
maintenance, tool change, etc.) as well as
during transport and storage, set the rota-
tional direction switch to the centre posi-
tion. Unintentional actuation of the On/Off
switch can lead to injuries.
Hold the rear sleeve 3 of the keyless chuck 1
tight and turn the front sleeve 2 in rotation di-
rection , until the tool can be inserted. Insert
the tool.
Hold the rear sleeve 3 of the keyless chuck 1
tight and firmly turn the front sleeve 2 in rota-
tion direction by hand.
Bosch Power Tools
Dr. Eckerhard Strötgen
Head of Product
Certification
The locking is released again to remove the tool
when the front sleeve 2 is turned in the opposite
direction.
Replacing the Drill Chuck
Before any work on the machine (e. g.,
maintenance, tool change, etc.) as well as
during transport and storage, set the rota-
tional direction switch to the centre posi-
tion. Unintentional actuation of the On/Off
switch can lead to injuries.
Removing the Securing Screw (see figure B)
The keyless chuck 1 is secured with a securing
screw 12 against unintentional loosening from
the drill spindle. Completely open the keyless
chuck 1 and unscrew the securing screw 12 in
rotation direction
curing screw has a left-hand thread.
Removing the Drill Chuck (see figure C)
Clamp the short end of an Allen key 13 into the
keyless chuck 1.
Place the machine on a stable surface (e. g. a
workbench). Hold the machine firmly and loos-
en the keyless chuck 1 by turning the Allen key
13 in rotation direction
keyless chuck by giving the long end of the Allen
key 13 a light blow. Remove the Allen key from
the keyless chuck and completely unscrew the
keyless chuck.
Mounting the Drill Chuck (see figure D)
The keyless chuck is mounted in reverse order.
The drill chuck must be tightened with a
tightening torque of approx. 17–22 Nm.
Screw the securing screw 12 in anti-clockwise
direction into the opened keyless chuck, tight-
ening torque approx. 1.5–2.0 Nm. Always use a
new securing screw, as the threads are covered
with a thread-locking compound that loses its
effect after multiple usage.
English | 19
. Please note that the se-
. Loosen a tight-seated
2 609 140 649 | (14.5.09)