BM 1619929437 2/03 2/12/03 12:05 PM Page 7
Operating Instructions
DUAL FUNCTION TRIGGER SWITCHwhich setting to use for your application.
To turn the tool OON� in the Drilling/However, a pre-test will determine the best
Hammering mode, squeeze and hold thespeed setting, as the chart is intended only
trigger switch. To turn the tool OOFF�,as a guide. Once the proper setting is
release the trigger switch, which is springdetermined the impact rate and rotating
loaded and will return to the OOFF� positionspeed is kept constant by means of the
automatically."Electronic Feedback Circuitry". The variable
Your tool is also equipped with a "Lock-ON"speed dial can be adjusted while the motor
feature when the selector dial is in theis running, allowing the operator to adjust
Hammering Only mode which allowsthe impact rate and rotating speed
continuous operation without holding theaccording to the actual application.
trigger.
TO LOCK TOOL OON�: turn the selector dial"TURBO" FEATURE
to the Hammering Only mode and squeezeIn the "Hammer Only" mode power is
the trigger switch until it locks.automatically increased 20% when the tool
TO TURN TOOL: OOFFO press the triggeris turned on to provide maximum chiselling
release switch and the trigger will return toperformance.
the OOFF� position automatically.
To increase switch life, do not turn switch onELECTRONIC FEEDBACK CIRCUITRY
and off while tool is under load.(EFC)
The internal electronic feedback system
provides a "soft start", which will reduce the
VARIABLE SPEED DIAL
stresses that occur from a high torque start.
Your tool is equipped with a variable speed
The system also helps to keep the pre-
dial. The impact rate (BPM) and rotating
selected impact rate and rotating speed
speed (RPM) can be varied according to the
virtually constant between no-load and load
type of work being performed by setting the
conditions.
variable speed dial to the selected setting.
The chart below will help you to determine
INSTALLING ACCESSORIES
Clean the insert shank end of the accessory
Chipping (Demolition)to remove any debris, then lightly grease
with a light oil or lubricant.
Area of applicationControl setting
Insert accessory into the tool holder through
Plaster work1 - 2
the dust shield, while twisting and pushing
Removing tiles3inward until it locks automatically into place.
Brick work4Pull outward on the accessory to be certain
it is locked into the tool holder.(fig. 2).
Concrete5 - 6
NOTE: The high efficiency available from the
rotary hammers can only be obtained if
sharp and undamaged accessories are used.
Drilling Holes
The "cost" to maintain sharp and
undamaged accessories is more than offset
Lower speedsHigher speeds
by the "time saved" in operating the tool
with sharp accessories.Accurate startsFaster penetration
Minimize breakouts
REMOVING ACCESSORIES
when the bit exits
Accessories may be hot
the material.!WARNING
after use. Avoid contact
with skin and use proper protective gloves or
cloth to remove.
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ACEC
BOSCH
