18
| English
2 609 005 654 | (22.6.12)
Bosch Power Tools
Operation
Starting Operation
f
Observe correct mains voltage! The voltage of the pow-
er source must agree with the voltage specified on the
nameplate of the machine. Power tools marked with
230 V can also be operated with 220 V.
Reversing the rotational direction (see figure K)
The rotational direction switch
9
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:
Press the rotational direction switch
9
through to the right stop (for drilling and driving screws).
The indicator for right-hand rotation
6
indicates the selected
rotational direction.
Left rotation:
Press the rotational direction switch
9
through
to the left stop (for loosening and unscrewing screws and
nuts).
The indicator for left-hand rotation
7
indicates the selected
rotational direction.
Setting the operating mode
Drilling and Screwdriving
Set the selector switch
4
to the “Drilling” symbol.
Impact Drilling
Set the selector switch
4
to the “Impact drilling”
symbol.
The selector switch
4
engages noticeably and can also be ac-
tuated with the machine running.
Gear selection, mechanical
f
The gear selector 11 can be actuated on machines run-
ning 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
11
.
Gear I:
Low speed range; for working with large drill-
ing diameter or for driving in screws.
Gear II:
High speed range; for working with small drill-
ing diameter.
Always turn the gear selector
11
in the direction of the arrow.
If the gear selector
11
cannot be fully engaged, lightly rotate
the drive spindle with the drill bit by twisting the drill chuck.
Switching On and Off
To
start
the machine, press the On/Off switch
10
and keep it
pressed.
To lock the
pressed
On/Off switch
10
, press the lock-on but-
ton
8
.
To
switch off
the machine, release the On/Off switch
10
or
when it is locked with the lock-on button
8
, briefly press the
On/Off switch
10
and then release it.
When not using the power tool, switch it off in order to save
energy.
Adjusting the Speed/Impact Frequency
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.
Preselecting the Speed/Impact Frequency
(PSB 850-2 RE/PSB 850-2 RA)
With the thumbwheel for speed preselection
16
, the required
speed/impact frequency can be preselected even during
operation.
The required speed/impact frequency depends on the mate-
rial and the working conditions, and can be determined
through practical testing.
Electronic Speed Preselection
(PSB 1000-2 RCE/PSB 1000-2 RCA)
With the thumbwheel for electronic speed preselection
5
, the
required speed/impact frequency can be selected even if the
machine is running.
The required speed/impact frequency depends on the mate-
rial and the working conditions, and can be determined
through practical testing.
For working with low speed.
For working with maximum speed.
Working Advice
f
Apply the power tool to the screw/nut only when it is
switched off.
Rotating tool inserts can slip off.
After longer periods of working at low speed, allow the ma-
chine to cool down by running it for approx. 3 minutes at max-
imum speed with no load.
Maintenance and Service
Maintenance and Cleaning
f
Before any work on the machine itself, pull the mains
plug.
f
For safe and proper working, always keep the machine
and ventilation slots clean.
OBJ_BUCH-875-003.book Page 18 Friday, June 22, 2012 9:38 AM
