Maintenance; Replacing Carbon Brushes - Makita JN3201 Instruction Manual

There is more vibration when cutting stainless steel
than mild steel. Less vibration and better cutting is pos-
sible by adding another washer (standard equipment)
beneath the die.
Use the hex wrench provided to remove the two screws
and insert the washer below the die. Replace screws
and tighten securely.

MAINTENANCE

CAUTION:
• Always be sure that the tool is switched off and
unplugged before attempting to perform inspec-
tion or maintenance.
• Never use gasoline, benzine, thinner, alcohol
or the like. Discoloration, deformation or cracks
may result.
The tool and its air vents have to be kept clean.
Regularly clean the tool's air vents or whenever the
vents start to become obstructed.
Punch & die service life
Replace or sharpen punch and die after cutting the
lengths indicated in the accompanying table. Their life,
of course, depends upon the thickness of materials cut
and lubrication conditions.
Punch Replace after 150 m (492 ft.) of 3.2 mm (1/8") steel sheet
Die Sharpen after 300 m (984 ft.) of 3.2 mm (1/8") steel sheet
When cutting is poor even after replacing the punch,
sharpen the die. Grind down the dull edge shown in the
figure using a grinder. After rough-grinding the dull por-
tion, finish with a dressing stone. Stock removal should
be about 0.3 to 0.4 mm (1/64").
► 1. Grind/sharpen; 0.3 - 0.4 mm (1/64") 2. Remove
dull portion
When installing ground die, a clearance of 3.5 to 4.0
mm (1/8" to 5/32") should be obtained by attaching one
or two of the washer provided, as shown in the figure.
Failure to have the proper clearance will result in vibra-
tion during cutting.
► 1. 3.5 -4.0 mm (1/8" - 5/32") 2. Die 3. Washer
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► 1. Limit mark
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Remove and check the carbon brushes regularly.
Replace when they wear down to the limit mark. 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.
► 1. Screwdriver 2. Brush holder cap
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CAUTION:
• Secure installing screws carefully when install-
ing. A loose screw can cause tool breakage
during operation.
NOTE:
• The die can be sharpened two times. After two
sharpenings, it should be replaced with new
one.

Replacing carbon brushes

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