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OBJ_BUCH-1318-002.book Page 15 Monday, August 3, 2015 5:41 PM
Operation
Starting Operation
Observe correct mains voltage! The voltage of
the power source must agree with the voltage
specified on the nameplate of the machine.
Power tools marked with 230 V can also be op-
erated with 220 V.
Reversing the rotational direction
(see figures G–H)
Actuate the rotational direction switch 3 only
when the machine is at a standstill.
The rotational direction switch 3 is used to reverse
the rotational direction of the machine. However,
this is not possible with the On/Off switch 6 actuat-
ed.
Right rotation: For drilling and driving in screws,
push the rotational direction switch 3 downward on
the left side and at the same time upward on the
right side.
Left rotation: For loosening and unscrewing
screws and nuts, push the rotational direction
switch 3 upward on the left side and at the same
time downward on the right side.
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 engages noticeably and can
also be actuated with the machine running.
Gear selection, mechanical
The gear selector 8 can be actuated on ma-
chines running at low speed. However, this
should not be done when the machine is
stopped, at full load or running at maximum
speed.
Two speed ranges can be preselected with the
gear selector 8.
Gear I:
Low speed range; for working with
large drilling diameter or for driving in
screws.
Gear II:
High speed range; for working with
small drilling diameter.
If the gear selector 8 cannot be fully engaged, light-
ly rotate the drive spindle with the drill bit by twist-
ing the drill chuck.
1 609 92A 1CY • 3.8.15
Switching On and Off
To start the machine, press the On/Off switch 6
and keep it pressed.
To lock the pressed On/Off switch 6, press the
lock-on button 4.
To switch off the machine, release the On/Off
switch 6 or when it is locked with the lock-on button
4, briefly press the On/Off switch 6 and then re-
lease it.
Overload Clutch
To limit high reaction torque, the power tool is
equipped with an overload clutch.
If the tool insert becomes caught or jammed,
the drive to the drill spindle is interrupted. Be-
cause of the forces that occur, always hold the
power tool firmly with both hands and provide
for a secure stance.
If the power tool jams, switch the machine off
and loosen the tool insert. When switching the
machine on with the drilling tool jammed, high
reaction torques can occur.
Adjusting the Speed/Impact Rate
The speed/impact rate of the switched on power
tool can be variably adjusted, depending on how
far the On/Off switch 6 is pressed.
Light pressure on the On/Off switch 6 results in low
speed/impact rate. Further pressure on the switch
increases the speed/impact rate.
Preselecting the Speed/Impact Rate
With the thumbwheel for speed preselection 7, the
required speed/impact rate can be preselected
even during operation.
The required speed/impact rate depends on the
material and the working conditions, and can be
determined through practical testing.
Working Advice
Apply the power tool to the screw/nut only
when it is switched off. Rotating tool inserts can
slip off.
Tips
After longer periods of working at low speed, allow
the machine to cool down by running it for approx.
3 minutes at maximum speed with no load.
For drilling in tiles, set the selector switch 2 to the
"Drilling" symbol. Do not switch over to the symbol
"Impact Drilling" or work with impact until after drill-
ing through the tile.
Use carbide tipped drill bits when working in con-
crete, masonry and brick wall.
For drilling in metal, use only perfectly sharpened
HSS drill bits (HSS=high-speed steel). The appro-
priate quality is guaranteed by the Berner accesso-
ries program.
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