Functional Description; Operation - Makita DA391D Instruction Manual

FUNCTIONAL DESCRIPTION

CAUTION:
Always be sure that the tool is switched off and the
•
battery cartridge is removed before adjusting or
checking function on the tool.
Installing or removing battery cartridge
Fig.1
Always switch off the tool before insertion or
•
removal of the battery cartridge.
To remove the battery cartridge, pull out the set
•
plate on the tool and grasp both sides of the
cartridge while withdrawing it from the tool.
To insert the battery cartridge, align the tongue on
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the battery cartridge with the groove in the housing
and slip it into place. Snap the set plate back into
place. Be sure to close the set plate fully before
using the tool to prevent the battery cartridge from
accidentally falling out of the tool.
Do not use force when inserting the battery
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cartridge. If the cartridge does not slide in easily, it
is not being inserted correctly.
Switch action
Fig.2
CAUTION:
Before inserting the battery cartridge into the tool,
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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. Tool
speed is increased by increasing pressure on the switch
trigger. Release the switch trigger to stop.
Reversing switch action
Fig.3
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
counterclockwise rotation.
When the reversing switch lever is in the neutral position,
the switch trigger cannot be pulled.
CAUTION:
Always check the direction of rotation before
•

operation.

Use the reversing switch only after the tool comes
•
to a complete stop. Changing the direction of
rotation before the tool stops may damage the tool.
When not operating the tool, always set the
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reversing switch lever to the neutral position.
Overload protector
Fig.4
The overload protector automatically cuts out to break
the circuit and the button pops out, whenever heavy
work is prolonged. Wait 20 - 30 seconds before pressing
the reset button to resume operation. The tool should be
switched off when you press the reset button, however.
ASSEMBLY
CAUTION:
Always be sure that the tool is switched off and the
•
battery cartridge is removed before carrying out
any work on the tool.
Installing or removing driver bit or drill bit
Fig.5
Hold the ring and turn the sleeve counterclockwise to
open the chuck jaws. Place the bit in the chuck as far as
it will go. Hold the ring firmly and turn the sleeve
clockwise to tighten the chuck.
To remove the bit, hold the ring and turn the sleeve
counterclockwise.
OPERATION
Screwdriving operation
Fig.6
Place the point of the driver bit in the screw head and
apply pressure to the tool. Start the tool slowly and then
increase the speed gradually. Release the trigger just as
the screw bottoms out. If the trigger is not released, the
screw may strip out the hole or the screw and/or bit may
be damaged.
CAUTION:
Make sure that the driver bit is inserted straight in
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the screw head, or the screw and/or bit may be
damaged.
NOTE:
When driving wood screws, predrill pilot holes to
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make driving easier and to prevent splitting of the
workpiece. See the chart.
Nominal diameter of wood screw
(mm)
3.1
3.5
3.8
4.5
006422
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.
5
Recommended size of pilot hole
(mm)
2.0 - 2.2
2.2 - 2.5
2.5 - 2.8
2.9 - 3.2