Working Advice - Bosch GBH 18V-26 Professional Manual Original

OBJ_DOKU-61647-001.fm Page 7 Wednesday, August 2, 2017 10:03 AM
7 | English
Position for hammer drilling in concrete or
stone
Position for drilling without impact in wood,
metal, ceramic and plastic as well as for
screwdriving
Vario-Lock position for adjustment of the chi-
selling position
The mode selector switch 13 does not latch in
this position.
Position for chiselling
Reversing the rotational direction
The rotational direction switch 8 is used to reverse the rota-
tional direction of the machine. However, this is not possible
with the On/Off switch 10 actuated.
Right rotation: Slide the rotational direction switch 8 all
the way to the left.
Left rotation: Slide the rotational direction switch 8 all the
way to the right.
Set the direction of rotation for hammer drilling, drilling and
chiselling always to right rotation.
Switching On and Off
To save energy, only switch the power tool on when using it.
– To start the machine, press the On/Off switch 10.
When starting the machine for the first time, a starting delay
is possible, as the electronic system of the power tool has to
configure itself first.
– To switch off the machine, release the On/Off switch 10.
Setting 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 10
is pressed.
Light pressure on the On/Off switch 10 results in low
speed/impact rate. Further pressure on the switch increases
the speed/impact rate.
Electronic Precision Control (EPC) (see figure A)
EPC assists you when working with impact in sensitive mate-
rials by ensuring slow start-up and reduced operating speed.
– Slide the EPC switch 19 to the desired position.
Position for maximum operating speed
Position for slow start-up and reduced operating
speed
1 609 92A 3YU | (2.8.17)
Overload Clutch
 If the tool insert becomes caught or jammed, the drive
to the drill spindle is interrupted. Because 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 loos-
en the tool insert. When switching the machine on with
the drilling tool jammed, high reaction torques can oc-
cur.
Rapid Shut-off (Kickback Control)
The rapid shut-off feature (Kickback Control) provides better
control over the power tool to increase user protection com-
pared to power tools that do not have Kickback Control. The
power tool will switch off if it suddenly and unforeseeably ro-
tates around the drilling axis.
– To restart the machine, release the On/Off switch and
then actuate again.
Rapid shut-off is indicated by flashing of the worklight 14 on
the power tool.

Working Advice

Adjusting the Drilling Depth (see figure O)
The required drilling depth X can be set with the depth stop 17.
– Press the button for the depth stop adjustment 15 and in-
sert the depth stop into the auxiliary handle 16.
The knurled surface of the depth stop 17 must face down-
ward.
– Insert the SDS-plus drilling tool to the stop into the SDS-
plus tool holder 3. Otherwise, the movability of the SDS-
plus drilling tool can lead to incorrect adjustment of the
drilling depth.
– 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.
Changing the Chiselling Position (Vario-Lock)
The chisel can be locked in 44 positions. In this manner, the
optimum working position can be set for each application.
– Insert the chisel into the tool holder.
– Turn the mode selector switch 13 to the Vario-Lock posi-
tion (see Setting the operating mode, page 6.
– Turn the tool holder to the desired chiselling position.
– Turn the mode selector switch 13 to the chiselling posi-
tion. The tool holder is now locked.
– For chiselling, set the rotation direction to right rotation.
Inserting Screwdriver Bits (see figure P)
 Apply the power tool to the screw/nut only when it is
switched off. Rotating tool inserts can slip off.
To work with screwdriver bits, a universal bit holder 31 with
SDS-plus shank (accessory) is required.
– Clean the shank end of the adapter shank and apply a light
coat of grease.
– Insert the universal bit holder with a turning motion into
the tool holder until it automatically locks.
– Check the locking effect by pulling the universal bit holder.
– Insert a screwdriver bit into the universal bit holder. Use
only screwdriver bits that match the screw head.
Bosch Power Tools