Makita 8420V, Instruction Manual

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5
Be sure to use concrete and masonry drilling bit.
Rotation only:
1
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For drilling in wood, metal or plastic metals, move
change lever to the
position.
Use a conventional bit for drilling in wood or metal.
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)
1
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To install the side grip, fit the teeth on the side grip into
the grooves on the tool. Then tighten the wing nut
securely.
The position of the side grip can be changed in 30°
increments. Simply loosen the wing nut and slip out the
side grip teeth from the grooves on the tool. Swing the
side grip to the desired position and then slip the side grip
teeth back into the grooves on the tool. Then tighten the
wing nut securely.
Installing or removing drill bit
1
2
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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 it to the
original position.
Depth gauge
1
2
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Loosen the wing bolt and adjust the depth gauge to the
desired depth. After adjusting, tighten the wing bolt.
OPERATION
CAUTION:
•
Always use the side grip (auxiliary handle) and
firmly hold the tool by both side grip and switch
handle during operations.
Hammer drilling operation
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Position the bit at the desired location for the hole, then
pull the switch trigger. Do not force the tool. Light
pressure gives best results. Keep the tool in position and
prevent 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.
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.
1. Depth gauge
2. Wing nut
1. Tighten
2. Chuck key
1. Wing nut
1. Change lever