Bosch GSB 20-2 Professional Notice Originale page 22

22 | English
Assembly
Auxiliary Handle (see figure A)
Operate your machine only with the auxiliary
handle 12.
The auxiliary handle 12 can be set to any position
for a secure and low-fatigue working posture.
Turn the bottom part of the auxiliary handle 12 in
counterclockwise direction and swivel the auxil-
iary handle 12 to the desired position. Then
retighten the bottom part of the auxiliary handle
12 by turning in clockwise direction.
Adjusting the Drilling Depth (see figure A)
The required drilling depth X can be set with the
depth stop 13.
Press the button for the depth stop adjustment
11 and insert the depth stop into the auxiliary
handle 12.
Pull out the depth stop until the distance be-
tween the tip of the drill bit and the tip of the
depth stop correspond with the desired drilling
depth X.
The knurled surface of the depth stop 13 must
face upward.
Changing the Tool
Before any work on the machine itself, pull
the mains plug.
Keyless Chuck (see figure B)
The drill spindle is locked when the On/Off
switch 7 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 , until the tool can be inserted. Insert
the tool.
Firmly tighten the collar of the keyless chuck 1 by
hand in rotation direction
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 direc-
tion.
1 609 929 M38 | (11.9.07)
until the locking ac-
Key Type Drill Chuck (see figure C)
Wear protective gloves when changing the
tool. The drill chuck can become very hot dur-
ing longer work periods.
Open the key type drill chuck 15 by turning until
the tool can be inserted. Insert the tool.
Insert the chuck key 14 into the corresponding
holes of the key type drill chuck 15 and clamp the
tool uniformly.
Screwdriver Tools (see figure D)
When working with screwdriver bits 16, a univer-
sal bit holder 17 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 2 to the
"Drilling" symbol.
Replacing the Drill Chuck
Before any work on the machine itself, pull
the mains plug.
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)
Disassemble the auxiliary handle and set the gear
selector 10 to the centre position between the
1st and 2nd gear.
Insert a steel pin with a diameter of Ø 4 mm and
approx. 50 mm of length into the drill hole on the
spindle neck in order to lock the drill spindle.
Clamp the short end of an Allen key 18 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 18 in
rotation direction
less chuck by giving the long end of the Allen key
18 a light blow. Remove the Allen key from the
keyless chuck and completely unscrew the key-
less chuck.
. Loosen a tight-seated key-
Bosch Power Tools