Operation; Maintenance; Replacing Carbon Brushes - Makita DA4030 Instruction Manual

Angle drill
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To install the bit, place it in the chuck as far as it will go.
Tighten the chuck by hand. Place the chuck key in each
of the three holes and tighten clockwise. Be sure to
tighten all three chuck holes evenly.
To remove the bit, turn the chuck key counterclockwise
in just one hole, then loosen the chuck by hand.
After using the chuck key, be sure to return to the
original position.


Holding tool
This is a powerful tool. High torque is developed
and it is important that the tool should be securely
held and properly braced.
Grasp the switch handle with one hand and the spade
grip with the other hand. When drilling a large hole with a
self-feed bit, etc., the side grip (auxiliary handle) should
be used as a brace to maintain safe control of the tool.
When drilling action is forward (clockwise), the tool
should be braced to prevent a counterclockwise reaction
if the bit should bind. When reversing, brace the tool to
prevent a clockwise reaction. If the bit must be removed
from a partially drilled hole, be sure the tool is properly
braced before reversing.
Drilling operation
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
1. Reaction
2. Forward
3. Spade grip
4. Handle
1. Reaction
2. Reverse
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
exceptions are iron and brass which should be drilled
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
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
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.
Avoid drilling in material that you suspect contains
hidden nails or other things that may cause the bit
to bind or break.


Always be sure that the tool is switched off and
unplugged before attempting to perform inspection
or maintenance.

Replacing carbon brushes

Remove and check the carbon brushes regularly.
Replace when they wear down to the limit mark. Keep
the carbon brushes clean and free to slip in the holders.
Both carbon brushes should be replaced at the same
time. Use only identical carbon brushes.
1. Limit mark


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