5
Switch action (Fig. 1)
CAUTION:
• Before plugging in the tool, always check to see that
the switch trigger actuates properly and returns to the
“OFF” position when released.
To start the tool, simply pull the switch trigger. Release
the switch trigger to stop.
Reversing switch action (Fig. 2)
This tool has a reversing switch to change the direction of
rotation. Depress the reversing switch lever from the A
side for clockwise rotation or from the B side for counter-
clockwise rotation.
CAUTION:
• Always check the rotational direction before operation.
• Use the reversing switch only after the tool comes to a
complete stop. It will damage the tool to change the
rotational direction before the tool stops.
Speed change (Fig. 3)
For Model DA4031 only
Two speed ranges can be preselected with the speed
change knob.
To change the speed, depress the lock button and turn
the speed change knob so that the pointer points to the
position 1 for low speed or the position 2 for high speed.
CAUTION:
• Use the speed change knob only after the tool comes
to a complete stop. Changing the tool speed before the
tool stops may damage the tool.
• Always set the speed change knob carefully into the
correct position. If you operate the tool with the speed
change knob positioned halfway between the position 1
and the position 2, the tool may be damaged.
Torque limiter
For Model DA4031 only
The torque limiter will actuate when a certain torque level
is reached (for low speed setting: position 1). The motor
will disengage from the output shaft. When this happens,
the bit will stop turning.
Switch handle mounting positions (Fig. 4)
The switch handle can be rotated to either 90° left or right
to fit your work needs. First, unplug the tool. Press the
lock button and rotate the switch handle until the
U
mark
on the lock button is aligned with that on the motor hous-
ing. The switch handle will be locked in that position.
ASSEMBLY
CAUTION:
• Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
Installing side grip (auxiliary handle) (Fig. 5)
CAUTION:
• Always be sure that the side grip is installed securely
before operation.
Screw the side grip on the tool securely. The side grip
can be installed on either side of the tool, whichever is
convenient.
Spade grip (Fig. 6 & 7)
The spade grip can be installed in any position as shown
in the figure. To change the position, loosen the hex bolts
(both sides) with a hex wrench and turn the spade grip to
the desired position. Then tighten the hex bolts securely.
After reposition the grip, return the hex wrench to the
wrench holder.
CAUTION:
• Do not fix the spade grip beyond the limits of the arrow.
Be cautious that your hand is not caught in the grip.
Keep the hand away from the drill chuck. They can lead
to serious accidents.
• Always be sure that the hex bolts (both sides) of the
spade grip are tightened securely.
Installing or removing drill bit (Fig. 8)
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 it to the origi-
nal position.
OPERATION
Holding tool (Fig. 9 & 10)
CAUTION:
• This is a powerful tool. High torque is developed and it
is important that the tool is 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
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.
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 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.
