6
Switch action (Fig.4)
For Model 8450, 8451
To start the tool, simply pull the trigger. Tool speed is
increased by increasing pressure on the trigger.
Release the trigger to stop. For continuous operation,
pull the trigger and then push in the lock button. To
stop the tool from the locked position, pull the trigger
fully, then release it.
For Model 8452
To start the tool, simply pull the trigger. Tool speed is
increased by increasing pressure on the trigger.
Release the trigger to stop. For continuous operation,
pull the trigger and then push in the lock button. To
stop the tool while in the locked position, pull the trig-
ger fully, then release it.
Reversing switch (Fig.5)
For Model 8450, 8451
These tools have a reversing switch to change the
direction of rotation. Move the reversing switch lever
to the
d
position for clockwise rotation or the
e
posi-
tion for counterclockwise rotation.
CAUTION:
• Always check the direction of rotation before opera-
tion.
• Use the reversing switch only after the tool comes
to a complete stop. Changing the direction of rota-
tion before the tool stops may damage the tool.
• A stuck bit can be removed simply by setting the
reversing switch to reverse rotation in order to back
out. However, the tool may back out abruptly if you
do not hold it firmly.
For ALL MODELS
CAUTION:
Before plugging the tool, always check to see that the
switch trigger actuates properly and returns to the
“OFF” position when released.
Action mode (Fig.6)
This tool employs the action mode changing buttons.
For rotation only, press the button on the
s
mark
side fully. For rotation with hammering, press the but-
ton on the
g
mark side fully.
CAUTION:
Be sure to press the action mode changing button as
far as it will go. Failure to do so may cause malfunc-
tion of the tool.
Operation (Fig.7)
1) Hammer drilling operation
When drilling in concrete, granite, tile, etc., press the
button on the
g
mark side fully. Be sure to use a
tungsten-carbide tipped bit. Do not apply more pres-
sure when the hole becomes clogged with chips or
particles. Instead, run the tool at an idle, then remove
the bit partially from the hole. By repeating this sev-
eral times, the hole will be cleaned out. After drilling
the hole, use the blow-out bulb to clean the dust out
of the hole.
2) Drilling operation
When drilling in wood, metal or plastic materials,
press the button on the
s
mark side fully.
Drilling in wood
When drilling in wood, best results are obtained with
wood drills equipped with a guide screw. The guide
screw makes drilling easier by pulling the bit into the
workpiece.
Drilling in metal
To prevent the bit from slipping when starting a hole,
make an indentation with a centerpunch and hammer
at the point to be drilled. Place the point of the bit in
the indentation and start drilling. Use a cutting lubri-
cant when drilling metals. The exceptions are iron
and brass which should be drilled dry.
CAUTION:
• Pressing excessively on the tool will not speed up
the drilling. In fact, this excessive pressure will only
serve to damage the tip of your bit, decrease the
tool performance and shorten the service life of the
tool.
• There is a tremendous twisting force exerted on the
tool/bit at the time of hole breakthrough. Hold the
tool firmly and exert care when the bit begins to
breakthrough the workpiece. Use both hands to
help control the tool. Be sure to use the side grip to
maintain proper control.
• A stuck bit can be removed simply by setting the
reversing switch to reverse rotation in order to back
out. However, the tool may back out abruptly if you
do not hold it firmly.
• Always secure small workpieces in a vise or similar
hold-down device.
MAINTENANCE
CAUTION:
Always be sure that the tool is switched off and
unplugged before attempting to perform inspection or
maintenance.
To maintain product safety and reliability, repairs, any
other maintenance or adjustment should be per-
formed by Makita Authorized or Factory Service Cen-
ters, always using Makita replacement parts.
