Berner 342990 Original Instructions Manual Download

Page: 19 / 164

ENGLISH

OPERATION
Instructions for Use

WARNING:

Always observe the safety instructions and

applicable regulations.

WARNING: To reduce the risk of serious personal

injury, turn tool off and disconnect tool from power

source before making any adjustments or removing/

installing attachments or accessories.

An accidental

start-up can cause injury.

WARNING:

Tool bits may be hot and gloves should

be worn when changing or removing them to avoid
personal injury.

WARNING:

• Be aware of the location of pipework and wiring.
• Apply only a gentle pressure to the tool (approximately

20 kg). Excessive force does not speed up drilling but
decreases tool performance and may shorten tool life.

• Always hold the tool ﬁrmly with both hands and

ensure a secure stance. Always operate the tool
with the side handle properly assembled.

NOTE:

Operating temperature is -7 ˚ to +40 ˚C. Using the

tool outside of this temperature range will decrease the life
of the tool.

Proper Hand Position (Fig. F)

WARNING:

To reduce the risk of serious personal injury,

ALWAYS

use proper hand position as shown.

WARNING:

To reduce the risk of serious personal

injury,

ALWAYS

hold securely in anticipation of

a sudden reaction.

Proper hand position requires one hand on the side handle

with the other hand on the main handle

Switching On and Off (Fig. A)

To turn the tool on, depress the trigger switch

To stop the tool, release the trigger switch.
The lock-on slider

allows the trigger switch

to be locked

on in chiselling mode only. If the lock-on button is activated in
drilling mode, as a feature the tool will switch off automatically.
To turn the tool on, press the trigger switch

To stop the tool, release the switch.
For continuous operation, press and hold down the switch

slide the lock-on button

upwards and release the switch.

To stop the tool in continuous operation, press the switch briefly
and release it. Always switch off the tool when work is finished
and before unplugging.

Hammerdrilling

To turn the tool on, press the on/off switch

To stop the tool, release the switch.

Drilling with a Solid Bit (Fig. A)

1. Insert the appropriate drill bit.
2. Set the mode selector switch

to the hammerdrilling

position.

3. Set the electronic speed and impact control dial

4. Fit and adjust the side handle

5.  Mark the spot where the hole is to be drilled.
6.  Place the drill bit on the spot and switch on the tool.
7.  Always switch off the tool when work is finished and

before unplugging.

Drilling with a Core Bit (Fig. A)

1.  Insert the appropriate core bit.
2.  Assemble the centerdrill into the core bit.
3.  Set the mode selector switch

to the

hammerdrilling position.

4. Turn the electronic speed and impact control dial

a medium or high speed setting.

5. Fit and adjust the side handle

6. Place the centerdrill on the spot and switch on the tool. Drill

until the core penetrates into the concrete approximately
1 cm.

7. Stop the tool and remove the centerdrill. Place the core bit

back into the hole and continue drilling.

8. When drilling through a structure thicker than the depth

of the core bit, break away the round cylinder of concrete
or core inside the bit at regular intervals.
To avoid unwanted breaking away of concrete around
the hole, first drill a hole the diameter of the centerdrill
completely through the structure. Then drill the cored hole
halfway from each side.

9. Always turn the tool off when work is finished and

before unplugging.

Chipping and Chiselling (Fig. A)

1. Insert the appropriate chisel and rotate it by hand to lock

it into one of 18 positions.

2. Set the mode selector switch

to the hammering

only position.

3. Set the electronic speed and impact control dial

4. Fit and adjust the side handle

5. Turn the tool on and start working.
6. Always turn the tool off when work is finished and

before unplugging.