Bosch Professional GSB 21-2 Original Instructions Manual page 8

OBJ_BUCH-945-002.book Page 8 Friday, October 21, 2016 12:48 PM
8 | English
Impact Drill
Electronic torque control
Speed preselection
Constant electronic control
Right/left rotation
Key type drill chuck
Keyless drill chuck
Fully automatic spindle locking (Auto-lock)
Overload Clutch
Spindle collar dia.
Maximum drilling diameter (1st/2nd gear)
– Concrete
– Brickwork
– Steel
– Wood
Chuck clamping range
Weight according to EPTA-Procedure 01:2014
Protection class
The values given are valid for a nominal voltage [U] of 230 V. For different voltages and models for specific countries, these values can vary.
Assembly
 Before any work on the machine itself, pull the mains
plug.
Auxiliary Handle
 Operate your machine only with the auxiliary handle
11.
Only for GSB 21-2 power tools with key type drill chuck:
Mount the auxiliary handle 11 in accordance with figures A to C.
The auxiliary handle 11 can be set in 12 positions to achieve
a safe and low-fatigue working stance.
Turn the bottom part of the auxiliary handle 11 in rotation
direction  and push the auxiliary handle 11 forward until
you can pivot it to the desired position. Then pull the auxiliary
handle 11 back again and tighten it by turning the bottom part
of the auxiliary handle in rotation direction  (see figure D).
Adjusting the Drilling Depth (see figure D)
The required drilling depth X can be set with the depth stop
12.
Press the button for the depth stop adjustment 10 and insert
the depth stop into the auxiliary handle 11.
Pull out the depth stop until the distance between the tip of
the drill bit and the tip of the depth stop corresponds with the
desired drilling depth X.
The knurled surface of the depth stop 12 must face upward.
Changing the Tool
 Wear protective gloves when changing the tool. The drill
chuck can become very hot during longer work periods.
1 609 92A 374 | (21.10.16)
GSB ... 21-2 21-2 RE
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mm 43 43
mm 22/13 22/13
mm 24/16 24/16
mm 16/8 16/8
mm 40/25 40/25
mm 3–16 1.5–13
kg 2.9 2.9
/II /II
Keyless Chuck (see figure E)
The drill spindle is locked when the On/Off switch 7 is not
pressed. This makes quick, convenient 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 ro-
tation direction  until the locking action ("click") is no longer
heard. This automatically locks the chuck.
The locking is released again to remove the tool when the
collar is turned in the opposite direction.
Key Type Drill Chuck (see figure F)
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 G)
When working with screwdriver bits 16, a universal bit holder
17 should always be used. Use only screwdriver bits that fit
the screw head.
For driving screws, always position the "Drilling/Impact Drill-
ing" selector switch 2 to the "Drilling" symbol.
Replacing the Drill Chuck
 For power tools without spindle lock, the drill chuck
must be replaced by an authorised after-sales service
agent for Bosch power tools.
Removing the Drill Chuck (see figure H)
Disassemble the auxiliary handle and set the gear selector 9
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.
21-2 RE 21-2 RCT 21-2 RCT
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 
  
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 
  
–
 
– –

–  –
  
43 43 43
22/13 22/13 22/13
24/16 24/16 24/16
16/8 16/10 16/10
40/25 40/25 40/25
1.5–13 1.5–13 1.5–13
2.9 2.9 2.9
/II /II /II
Bosch Power Tools