Changing The Drill Chuck; Dust/Chip Extraction; Starting Operation - Berner BRD-HT Manual Original

You can swivel the auxiliary handle (7) to any
angle for a safe work posture that minimises fa-
tigue.
Turn the lower gripping end of the auxiliary handle
(7) anticlockwise and swivel the auxiliary handle
(7) into the required position. Afterwards, turn the
lower gripping end of the auxiliary handle (7)
clockwise to retighten it.
Changing the tool (see figure B)
Wear protective gloves when changing tools.
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The drill chuck may heat up significantly when
it is used for long periods.
Hold the rear sleeve (3) of the keyless chuck (1)
firmly and turn the front sleeve (2) in the rotational
direction ➊ until the tool can be inserted. Insert
the tool.
Hold the rear sleeve (3) of the keyless chuck (1)
and firmly tighten the front sleeve (2) 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 front
sleeve (2) in the opposite direction to remove the
tool.
Screwdriving tools (see figure C)
You should always use a universal bit holder (11)
when using screwdriver bits (10). Only use screw-
driver bits that fit the screw head.

Changing the drill chuck

Pull the plug out of the socket before carry-
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ing out any work on the power tool.
Remove the securing screw (see figure D)
The keyless chuck (1) is secured with a securing
screw (12) against unintentional loosening from
the drill spindle. Fully open the keyless chuck (1)
and unscrew the securing screw (12) in rotational
direction ❶. Note that the securing screw has a
left-hand thread.
If the securing screw (12) is stuck, place a screw-
driver on the screw head and loosen the securing
screw by hitting the handle of the screwdriver.
Removing the drill chuck (see figure E)
To remove the keyless chuck (1), clamp a hex key
(13) in the keyless chuck (1) and position an
open-ended spanner (14) (width across flats: 14)
against the spanner flat of the drive spindle.
Place the power tool on a firm surface, e.g. a work
bench.
Hold the open-ended spanner (14) in place and
loosen the keyless chuck (1) by turning the hex
key (13) in the rotational direction ➊. A tightly
seated keyless chuck can be loosened with a light
blow on the long shaft of the hex key (13).
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Remove the hex key from the keyless chuck and
fully unscrew and remove the keyless chuck.
Fitting the Drill Chuck (see figure F)
To assemble the keyless chuck, perform the same
steps in reverse order.
Screw the securing screw (12) anticlockwise into
the opened keyless chuck (1). Always use a new
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securing screw because a securing adhesive sub-
stance is applied on its thread and is rendered in-
effective after repeated use.

Dust/Chip Extraction

Dust from materials such as lead-containing coat-
ings, some wood types, minerals and metal can
be harmful to one's health. Touching or breathing-
in the dust can cause allergic reactions and/or
lead to respiratory infections of the user or
bystanders.
Certain dust, such as oak or beech dust, is con-
sidered carcinogenic, especially in connection
with wood-treatment additives (chromate, wood
preservative). Materials containing asbestos may
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only be worked by specialists.
– Provide for good ventilation of the working
place.
– It is recommended to wear a P2 filter-class res-
pirator.
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Observe the relevant regulations in your country
for the materials to be worked.
Avoid dust accumulation at the workplace.
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Dust can easily ignite.
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Operation

Starting Operation

Pay attention to the mains voltage. The
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voltage of the 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.
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Products that are only sold in AUS and NZ:
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Use a residual current device (RCD) with a nom-
inal residual current of 30 mA or less.
Setting the rotational direction
Only operate the rotational direction switch
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(4) when the power tool is not in use.
The rotational direction switch (4) is used to
change the rotational direction of the power tool.
However, this is not possible while the on/off
switch (5) is being pressed.
The drill chuck must be tightened using
a tightening torque of approx. 10–
15 Nm.
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1 609 92A 5AJ • 8.10.19
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