6
OPERATION
Hammer drilling operation
CAUTION:
• There is a tremendous and sudden twisting force
exerted on the tool/bit at the time of hole break-
through, when the hole becomes clogged with chips
and particles, or when striking reinforcing rods embed-
ded in the concrete. Always use the side grip (auxiliary
handle) and firmly hold the tool by both side grip and
switch handle during operations. Failure to do so may
result in the loss of control of the tool and potentially
severe injury.
When drilling in concrete, granite, tile, etc., move the
action mode changing lever to the position of
g
symbol
to use “rotation with hammering” action.
Be sure to use a tungsten-carbide tipped bit.
Position the bit at the desired location for the hole, then
pull the switch trigger. Do not force the tool. Light pres-
sure gives best results. Keep the tool in position and pre-
vent it from slipping away from the hole.
Do not apply more pressure 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 several times, the hole will be cleaned out
and normal drilling may be resumed.
Blow-out bulb (optional accessory) (Fig. 10)
After drilling the hole, use the blow-out bulb to clean the
dust out of the hole.
Drilling operation
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 perfor-
mance and shorten the service life of the tool.
• There is a tremendous force exerted on the tool/bit at
the time of hole break through. Hold the tool firmly and
exert care when the bit begins to break through the
workpiece.
• 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.
When drilling in wood, metal or plastic materials, turn the
action mode changing lever to the position of
m
symbol to
use “rotation only” action.
Drilling in wood
When drilling in wood, the 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 center-punch and hammer at
the point to be drilled. Place the point of the bit in the
indentation and start drilling.
Use a cutting lubricant when drilling metals. The excep-
tions are iron and brass which should be drilled dry.
MAINTENANCE
CAUTION:
• Always be sure that the tool is switched off and
unplugged before attempting to perform inspection or
maintenance.
• Never use gasoline, benzine, thinner, alcohol or the
like. Discoloration, deformation or cracks may result.
Cleaning vent holes (Fig. 11)
The tool and its air vents have to be kept clean. Regularly
clean the tool’s air vents or whenever the vents start to
become obstructed.
To maintain product SAFETY and RELIABILITY, repairs,
carbon brush inspection and replacement, any other
maintenance or adjustment should be performed by
Makita Authorized Service Centers, always using Makita
replacement parts.
OPTIONAL ACCESSORIES
CAUTION:
• These accessories or attachments are recommended
for use with your Makita tool specified in this manual.
The use of any other accessories or attachments might
present a risk of injury to persons. Only use accessory
or attachment for its stated purpose.
If you need any assistance for more details regarding
these accessories, ask your local Makita Service Center.
• Tungsten-carbide tipped hammer bit
• Phillips bits
• Slotted bits
• Hole saw
• Blow-out bulb
• Safety goggles
• Keyless drill chuck 13
• Chuck key
• Grip assembly
• Depth gauge
• Plastic carrying case
NOTE:
• Some items in the list may be included in the tool pack-
age as standard accessories. They may differ from
country to country.
ENG905-1
Noise
The typical A-weighted noise level determined according
to EN60745:
Sound pressure level (L
pA
): 97 dB(A)
Sound power level (L
WA
): 108 dB(A)
Uncertainty (K): 3 dB(A)
Wear ear protection
ENG900-1
Vibration
The vibration total value (tri-axial vector sum) determined
according to EN60745:
Work mode: impact drilling into concrete
Vibration emission (a
h,ID
): 13 m/s
2
Uncertainty (K): 3 m/s
2
Work mode: drilling into metal
Vibration emission (a
h,D
): 2.5 m/s
2
or less
Uncertainty (K): 1.5 m/s
2
