TRIGGER "ON-OFF" SWITCH
To turn the tool “ON” squeeze the trigger
switch. To turn the tool “OFF”, release the
trigger switch, which is spring loaded and will
return to the “OFF” position automatically (Fig. 1).
"LOCK-ON" BUTTON
Your tool is also equipped with a “Lock-ON”
button located on the left side of the trigger
handle that allows for operation at maximum
RPM without holding the trigger (Fig. 1).
TO LOCK TRIGGER "ON": squeeze trigger,
depress button and release trigger.
TO UNLOCK THE TRIGGER: squeeze trigger
and release it without depressing the "Lock-
ON" button.
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 chiseling in hard masonry
material. Slower speeds work best for chiseling
material such as plaster or tile (Fig. 1).
"VARIO-LOCK"- SELECTOR SWITCH
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.
1. Turn selector switch to the
vario-lock position.
2. Insert accessory into the tool holder, then
turn the accessory to the desired position.
3. Turn selector switch to the
hammer position, then turn
accessory until it engages.
-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.
Operating Instructions
Tool Tips
Dust Extraction
For selection of dust collection systems and
operating instructions, see the Operating /
Safety Instructions for ‘Dust Extraction
Attachments for Hammers and Hammer Drills’
included with your tool or with the dust
extraction attachment.
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