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Drilling/Hammering:
used for drilling with solid
carbide bits and core bits
Hammering Only:
used for chipping
and demolition work
Vario-Lock:
allows chisel to be set in
one of 12 positions (right or
left “0” position)
TRIGGER CONTROLLED VARIABLE SPEED
Your tool is equipped with a variable speed
trigger switch. The tool speed can be controlled
from minimum to maximum nameplate rated
RPM by the pressure you apply to the trigger.
Apply more pressure to increase the speed and
release pressure to decrease speed (Fig. 1).
TRIGGER RELEASE SWITCH
Your tool is also equipped with a "Lock-ON"
feature when the selector dial is in the
Hammering Only mode which allows
continuous operation without holding the
trigger.
TO LOCK TOOL “ON”: turn the selector dial to
the Hammering Only mode and squeeze the
trigger switch until it locks (Fig. 1).
TO TURN TOOL: “OFF“ press the trigger
release switch and the trigger will return to the
“OFF” position automatically.
To increase switch life, do not turn switch on
and off while tool is under load.
VARIABLE SPEED DIAL
Your tool is equipped with a variable speed
dial. The speed and impact force can be
adjusted by rotating the dial. Higher speeds
and impact force work best for faster
penetration when drilling or chiseling in hard
masonry material. Slower speeds work best to
reduce breakout when bits exit material being
drilled or chiseling material such as plaster or tile
(Fig. 1).
Regardless of the pressure applied on the
trigger, the tool will not operate any faster than
maximum speed setting selected.
AUTO-MAX ™
The patented Bosch Auto-Max system insures
that each time your tool is plugged in and
receiving power, it will operate at maximum
speed and impact force.
When the power cord is
unplugged from the mains
outlet or when branch-circuit power is
interrupted, the electronic controller will
automatically reset the tool to maximum
speed and impact force.
Unexpected starting
at maximum operating speed and impact force
could startle the operator and lead to potential
injury.
"TURBO" FEATURE
In the "Hammer Only" mode power is
automatically increased 20% when the tool is
turned on to provide maximum chiselling
performance.
CONSTANT RESPONSE CIRCUITRY
The internal electronic feedback system
provides a "soft start", which will reduce the
stresses that occur from a high torque start.
The system also helps to keep the pre-
selected impact rate and rotating speed
virtually constant between no-load and load
conditions.
SELECTOR LEVER
The selector lever allows the tool to be set for
various applications as listed in the following
chart, (Fig. 4).
When using demolition or chipping bits such
as bull points, chisels, spades, gouges, etc.
the “Hammer Only” mode must be selected.
SELECTOR LEVER - “VARIO-LOCK”
The vario-lock can be set in any one of twelve
positions (30˚ increments). Choose a position
which is best suited for your operation. The
Vario-Lock position is intended for use with
chipping bits such as bull points, spades,
gouges, etc.
Turn the selector lever, to the “vario-lock”
setting. Next, rotate the locking sleeve,
along with the accessory, to the desired
position. Then turn the selector lever to the
“hammer only” setting and slightly turn the
locking sleeve to have it automatically lock
into a definite position.
FIG. 4
!
WARNING
BM 1619929843 05-08 5/21/08 3:39 PM Page 8