Operation; Maintenance - Makita 4112HS Instruction Manual

OPERATION

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1. Notch
2. Cutting line

MAINTENANCE

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1. Commutator
2. Insulating tip
3. Carbon brush
CAUTION:
Be sure to pull the tool when cutting a workpiece.
• 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. When you need to cut a workpiece over
60 mm up to 100 mm, make more than two passes of cuts. The depth of
the most efficient cut is about 40 mm.
Hold the tool firmly with both hands. First keep the wheel without making any
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contact with a workpiece to be cut. Then turn the tool on and wait until the
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wheel attains full speed.
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 in the position posed when finishing a cut. Raise the tool
after the wheel comes to a complete stop.
CAUTION:
• Always be sure that the tool is switched off and unplugged before
attempting to perform inspection or maintenance.
Dressing diamond wheel
If the cutting action of the diamond wheel begins to diminish, use an old dis-
carded 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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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 car-
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bon 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.
Pick up an end of the dust cover slightly with hands so that brush hoder cap
appears.
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