Replacing Blades - Makita 2012NB Instruction Manual

ASSEMBLY
CAUTION:
Always be sure that the tool is switched off and
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unplugged before carrying out any work on the tool.

Replacing blades

CAUTION:
Handle the blades very carefully when removing or
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installing the blades to prevent cuts or injury from
the blades and to prevent damage to the blades.
They are razor-sharp.
Clean out all chips, dust, pitch or foreign matter
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adhering to the drum or blades before installing the
blades.
Use blades of the same dimensions and weight , or
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drum oscillation/vibration will result, causing poor
cutting action and eventually, tool breakdown.
Replace both blades at the same time.
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The disposable-type blade has a cutting edge on
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both sides. When one cutting edge becomes dull,
you can use the other cutting edge. Always remove
resin and dirt sticking to the reverse side of the
blade before using the other cutting edge. This
blade must not be re-sharpened. When both cutting
edges become dull, the blade should be carefully
thrown away.
1. Removing blades
Loosen the thumb screw which secures the chip cover
and remove the chip cover. Remove the screws which
secure the right side cover. Then remove the right side
cover. Turn the pulley until the drum can be locked in the
position whereby the blade installation bolts face upward.
Fig.8
For throw away blades only
Place the two magnetic holders on the set plate and push
them in the direction of the arrow until the claw contact
the blade. Remove the six blade installation bolts using
the socket wrench. Grip the magnetic holders and raise
them straight up to remove the set plate and the blade
from the drum. Press the lock plate and turn the pulley
180° to lock the drum. Remove the other blade as
described above.
Fig.9
Fig.10
For standard blades only
Remove the six installation bolts using the socket wrench.
Raise the set plate and blade straight up to remove them
from the drum. Press the lock plate and rotate the drum
by turning the pulley 180° to lock the drum. Remove the
other blade as described above. Remove the set plate
from the blade.
Fig.11
Fig.12
1. Installing blades
CAUTION:
Use only Makita socket wrench provided to tighten
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the blade installation bolts. The use of any other
socket wrench may cause overtightening or
insufficient tightening of the bolts, resulting in
severe injury.
For throw away blades only
Provide a flat wood block approximately 300 mm long
and 100 mm wide. Place the blade and the set plate on
the wood block so that the blade locating lug of the set
plate rests in the groove of the blade. Adjust the set plate
so that both ends of the blade protrude approximately 1
mm beyond the end of the set plate. Place the two
magnetic holders on the set plate and push them until the
claw contacts the blade.
Fig.13
Grip the magnetic holder and slip the heel of the set plate
into the groove in the drum. Install the blade installation
bolts.
Fig.14
After tightening all the blade installation bolts lightly and
evenly from the center to the outside, tighten them
completely following the same sequence. Remove the
magnetic holders from the set plate.
Fig.15
Install the other blade as described above. Rotate the
drum slowly while pressing the lock plate to make sure
there is nothing abnormal. Then install the chip cover and
the side cover.
CAUTION:
Do not tighten the blade installation bolts without
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the blade locating lug of the set plate correctly
resting in the groove of the blade. This may cause
damage to the blade and potential injury to the
operator.
Do not turn the tool on with the chip cover removed.
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When installing the chip cover, make sure that the
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chain is not caught by the chip cover.
For standard blades only
Place the blade on the blade gauge so that the blade
edge is perfectly flush with the inside of the front rib (A).
Place the set plate on the blade, then gently press the
heel of the set plate flush with the back side of the blade
gauge (B). Tighten the screws to secure the set plate to
the blade.
Fig.16
Slip the heel of the set plate into the groove in the drum.
Install the blade installation bolts.
Fig.17
After tightening all the blade installation bolts tightly and
evenly from the center to the outside, tighten them
completely following the same sequence.
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