Maintenance - Makita JN3200 Instruction Manual

Punch replacement (Fig. 5, 6 & 7)
Important:
Always be sure that the tool is switched off and
unplugged before replacing the punch.
Fit the wrench provided onto the lock nut and tap the
handle lightly with a hammer to loosen the lock nut. Take
off the die holder and use a wrench to remove the screw.
Then remove the punch.
To install the punch, insert it into the punch holder with its
cutting edge facing forward so that the pin in the punch
holder fits into the groove in the punch. Install the screw
and lock nut. Then tighten them securely.
NOTE:
When installing the screw and lock nut, be sure to tighten
securely. If they become loose during operation, the tool
may break down.
Punch & die service life (Fig. 8 & 9)
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 of 3.2 mm steel sheet
Die Sharpen after 300 m of 3.2 mm steel sheet
When cutting is poor even after replacing the punch,
sharpen the die. Grind down the dull edge shown in
Fig. 8 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.
When installing ground die, a clearance of 3.5 to 4.0 mm
should be obtained by attaching one or two of the washer
provided, as shown in Fig. 9. Failure to have the proper
clearance will result in vibration during cutting.
NOTE:
The die can be sharpened two times. After two sharpen-
ings, it should be replaced with new one.

MAINTENANCE

CAUTION:
Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
Replacement of carbon brushes
(Fig. 10 & 11)
Replace carbon brushes when they are worn down to the
limit mark. Both identical carbon brushes should be
replaced at the same time.
To maintain product safety and reliability, repairs, mainte-
nance or adjustment should be carried out by a Makita
Authorized Service Center.
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