English |
19
Bosch Power Tools
1 609 929 V45 | (6.7.10)
Setting the Speed/Impact Rate
The electronic control enables stepless speed
and impact preselection in accordance with the
material to be worked.
The constant electronic control keeps the prese-
lected speed and impact rate nearly constant
between no-load and load conditions.
The maximum hammering capacity is achieved
when the thumbwheel
5
is set to position “6”.
For lower speed settings, the hammering capac-
ity is lower due to technical reasons.
– Select the speed with the thumbwheel
5
ac-
cording to the material.
The data in the following table are recommend-
ed values.
Safety Clutch
f
If the tool insert becomes caught or
jammed, the drive to the drill spindle is in-
terrupted. Because of the forces that occur,
always hold the power tool firmly with both
hands and provide for a secure stance.
f
If the power tool jams, switch the machine
off and loosen the tool insert. When switch-
ing the machine on with the drilling tool
jammed, high reaction torques can occur.
Working Advice
f
Before any work on the machine itself, pull
the mains plug.
Changing the Chiselling Position (Vario-Lock)
The chisel can be locked in 12 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
3
to the
“Vario-Lock” position (see “Setting the Oper-
ating Mode”, page 18).
– Turn the tool holder to the desired chiselling
position.
– Turn the mode selector switch
3
to the “chis-
elling” position. The tool holder is now
locked.
f
The mode selector switch 3 must always be
locked in the “Chiselling” position when
chiselling.
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.
f
A damaged dust protection cap should be
changed immediately. We recommend hav-
ing this carried out by an after-sales serv-
ice.
If the machine should fail despite the care taken
in manufacturing and testing procedures, repair
should be carried out by an after-sales service
centre for Bosch power tools.
In all correspondence and spare parts order,
please always include the 10-digit article
number given on the type plate of the machine.
Operating
Mode
Hammer Drilling
Chiselling
Thumb-
wheel
5
Rated
Speed
(rpm)
Impact
Rate
(min
-1
)
Impact
Rate
(min
-1
)
1
145
1350
1375
2
170
1625
1650
3
200
1975
2025
4
225
2175
2225
5
255
2475
2550
6
280
2700
2800
OBJ_BUCH-414-002.book Page 19 Tuesday, July 6, 2010 10:37 AM