Operation; Maintenance; Replacing Carbon Brushes - Makita 4112H Instruction Manual

Installing or removing the wheel
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004016
To remove the wheel, depress the shaft lock to hold the
shaft stationary, then loosen the hex bolt clockwise with
the socket wrench.
To install a wheel, place flange with its partly elevated
side facing the tool, and then place ring before installing
a wheel onto the spindle (shaft) and another flange with
partly elevated side facing outward.
Be sure to fully tighten the hex bolt counterclockwise after
mounting the new wheel, or operation will be dangerous.
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5
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004378
CAUTION:
Use only the Makita wrench to install or remove
•
the wheel.

OPERATION

CAUTION:
Be sure to pull the tool when cutting a workpiece.
Tthis tool should only be used on horizontal
•
surfaces.
Use this tool for straight line cutting only. Cutting
•
curves can cause stress cracks or fragmentation
of the diamond wheel and abrasive cut-off wheel
resulting in possible injury to persons in the vicinity.
After operation, always switch off the tool and wait
•
until the wheel has come to a complete stop
before putting the tool down.
When cutting concrete blocks, tiles or masonry
•
materials, do not make a cut in depth more than
60 mm (2-3/8"). When you need to cut a
workpiece over 60 mm (2-3/8") up to 100 mm (4"),
make more than two passes of cuts. The depth of
the most efficient cut is about 40 mm (1-9/16").
1. Shaft lock
2. Socket wrench
1
1. Flange
2. Ring
3. Wheel
4. Flange
5. Hex bolt
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2
Hold the tool firmly with both hands. First keep the
wheel without making any contact with a workpiece to
be cut. Then turn the tool on and wait until the wheel
attains full speed.
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004380
The cut is made by pulling the tool toward you (not by
pushing away from you). Align the notch on the base
with your cutting line when performing a cut.
Switch off the tool on the position posed when finishing
a cut. Raise the tool after the wheel comes to a
complete stop.

MAINTENANCE

CAUTION:
Always be sure that the tool is switched off and
•
unplugged before attempting to perform inspection
or maintenance.
Never use gasoline, benzine, thinner, alcohol or
•
the like. Discoloration, deformation or cracks may
result.
Dressing diamond wheel
If the cutting action of the diamond wheel begins to
diminish, use an old discarded coarse grit bench grinder
wheel or concrete block to dress the diamond wheel. To
do this, tightly secure the bench grinder wheel or
concrete block and cut in it.

Replacing carbon brushes

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001146
When the resin insulating tip inside the carbon brush is
exposed to contact the commutator, it will automatically
shut off the motor. When this occurs, both carbon
brushes should be replaced. 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.
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1. Notch
2
2. Cutting line
1. Commutator
2. Insulating tip
2
3. Carbon brush
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