Changing The Tool; Changing The Drill Chuck; Starting Operation - Bosch AdvancedImpact 900 Manual Original

18 | English
Please observe the following instructions to optimise your
use of the dust container:
– Ensure that the dust container is placed flush against the
workpiece or wall. This also makes it easier to drill at a
right angle.
– When you reach the required drilling depth, pull the drill
bit out of the drill hole first and then switch off the impact
drill.
– The dust protection ring (15) can wear, especially when
working with large drill-bit diameters. Replace the dust
protection ring when worn/damaged.

Changing the Tool

Keyless chuck (see figure H)
The drill spindle is locked when the on/off switch (6) is not
pressed. This makes it possible to change the application
tool in the drill chuck quickly, conveniently and easily.
Open the keyless chuck (1) by turning it in the direction of
rotation ➊ until the tool can be inserted. Insert the tool.
Firmly tighten the sleeve of the keyless chuck (1) by turning
it by hand in the rotational direction ➋ until it stops clicking.
This will automatically lock the drill chuck.
The lock will disengage again if you turn the sleeve in the op-
posite direction to remove the tool.
Screwdriving tools
You should always use a universal bit holder (24) when using
screwdriver bits (25). Only use screwdriver bits that fit the
screw head.
For screwdriving, make sure the "drilling/impact drilling" se-
lector switch (2) is always set to the "drilling" symbol.

Changing the drill chuck

Pull the plug out of the socket before carrying out any
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work on the power tool.
Removing the drill chuck (see figure I)
Remove the auxiliary handle (9) and set the gear selector
switch (3) to the middle position between first and second
gear.
Insert a steel pin with a diameter of 4 mm and a length of ap-
prox. 50 mm into the hole on the spindle collar to lock the
drill spindle in place. Clamp a hex key (27) in the keyless
chuck (1), leading with the short shaft.
1 609 92A 867 | (26.07.2022)
Place the power tool on a firm surface, e.g. a work bench.
Hold the power tool in place and loosen the keyless chuck
(1) by turning the hex key (27) in the rotational direction ➊.
A tightly seated keyless chuck is loosened with a light blow
on the long shaft of the hex key (27). Remove the hex key
from the keyless chuck and completely unscrew the keyless
chuck from the power tool.
Fitting the Drill Chuck (see figure J)
To assemble the keyless chuck, perform the same steps in
reverse order.
The drill chuck must be tightened using a tight-
ening torque of approx. 50–55 Nm.
After successfully fitting the drill chuck, remove the
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steel pin from the hole again.
Operation

Starting Operation

Pay attention to the mains voltage. The voltage of the
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power source must match the voltage specified on the
rating plate of the power tool. Power tools marked
with 230 V can also be operated with 220 V.
Products that are only sold in AUS and NZ: Use a resid-
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ual current device (RCD) with a nominal residual current
of 30 mA or less.
Setting the Rotational Direction (see figure K)
The rotational direction switch (4) is used to change the ro-
tational direction of the power tool. However, this is not pos-
sible while the on/off switch (6) is being pressed.
Right rotation: To drill and to drive in screws, press the ro-
tational direction switch (4) through to the right stop.
Left rotation: To loosen and unscrew screws and nuts,
press the rotational direction switch (4) through to the left
stop.
Setting the Operating Mode
Drilling and screwdriving
Set the selector switch (2) to the "drilling"
symbol.
Impact drilling
Set the selector switch (2) to the "impact
drilling" symbol.
The selector switch (2) clicks into place and can also be ac-
tuated when the motor is running.
Mechanical gear selection
You can press the gear selector switch (3) with the
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power tool running at a low speed. You should not do
this at full load or maximum torque, or when the tool is
not in use, however.
You can preselect two speed ranges with the gear selector
(3).
Bosch Power Tools