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TO TURN THE TOOL "ON" depress the
dust-protected switch to the number “I”
position.
TO TURN THE TOOL "OFF": depress switch
to the number “0” position (Fig. 1).
For low temperatures, the machine reaches
the full impact rate only after a certain time.
This start-up time can be shortened by
striking the chisel in the tool against the floor
one time.
The vario-lock selector ring can be set in any
one of twelve (30˚ increments) positions.
Choose a position which is best suited for your
operation. To adjust, pull the selector ring
forward and hold firmly, then turn both the
accessory and the selector ring to the desired
position. Release the selector ring and turn
the accessory slightly until it locks in place
(Fig. 6).
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 chiseling in hard masonry
material. Slower speeds work best for chiseling
material such as plaster or tile (Fig. 7).
"
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 virtually constant between
no-load and load conditions.
The integrated vibration damper in the main
handle and hammer mechanism reduces
vibrations (Fig. 7).
-9-
For the best penetration rates in concrete, run
the tool with a steady pressure, but do not use
excessive force as this will decrease the
efficiency of the tool.
All hammers require a short period of time to
warm up. Depending on the room temperature,
this time may vary from approximately 15
seconds (90˚F) to 2 minutes (32˚F). A new
hammer requires a break-in period before full
performance is realized. This period may
require up to 5 hours of operation.
An electric hammer is likely to be the most
expensive portable tool at the construction job.
The long wear and efficient operation of the
BOSCH hammers will more than justify the
cost for tools of this type. As earlier pointed
out, sharp accessories as well as clean air
vents are necessary for efficient operation.
Establish and follow a set maintenance
program.
22/,36
FIG. 6
VARIO-LOCK
SELECTOR RING
SERVICE REMINDER
LIGHT
FIG. 7
FIG. 4
VARIABLE SPEED DIAL
VIBRATION DAMPER HANDLE /
HAMMER MECHANISM
3(5$7,1*16758&7,216
BM 1609929X76 07-12_1609929X76 07-12.qxp 8/1/12 8:00 AM Page 9