Nitto Kohki LO-3550, Инструкция по эксплуатации

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18
8 MAINTENANCE/SERVICE
WARNING
●
Always disconnect the power and turn off the
switch before attempting any maintenance.
Failure to disconnect the power and turn off the
switch during set up, inspection or maintenance
can cause accidents and severe injuries.
●
Check to see periodically that mounting screws
are tight. If you
fi nd them loose, retighten.
8- 1. Keep the drill motor at the lifted up position
Keep the drill motor at the lifted up position while not
in use, or for the purpose of safety, when you do not
use the machine even for a while if it has a cutter
mounted. The pilot pin and/or cutter may have the
chance to be damaged if you keep the cutter at the
low position while carrying around.
8-2. Keep the Tip of Pilot Pin Sharp
When the tip of pilot pin gets dull, it sometimes
fails to seat properly in punched hole, and results
inaccurate hole position. See that the tip is sharp
enough from time to time. If you find otherwise,
regrind with care or replace as required. Grinding
with too much force makes the tip rather dull or
soften the pin material to such a degree that it is no
longer usable. (Fig. 32)
Pilot Pin
Optimal angle 70°
Grind the tip
Fig. 32
8-3. Recovery Measures When Pilot Pin Gets
Jammed
To replace the cutter, dismount the cutter from drill
and remove the pilot pin from the old cutter and
insert it into the new replacement cutter. The pilot
pin serves as the guide for the cutter centering.
However there are cases the pin would not come
off easily because cutting chips in the clearance
between the cutter and pin, cause jamming. In such,
tap the tip of the pilot pin with a WOODEN hammer
alike to push it out.
Pilot Pin
Cutter
Cutting chips
Fig. 33
8-4. Cutter Regrinding
When you need to regrind our cutters, please
contact sales agent through which you have
purchased or an authorized dealer near you.
8-5. Carbon Brushes Inspection and Replacement
Check Carbon Brushes for wear periodically.
When the length of Carbon Brushes gets as short
as 6mm, replace it with a new one, for, if you don’t,
chances are that you’ll have a recti
fi cation problem
which may cause machine failure. (Fig. 34)
Check - machine failure.
(1) Remove the Brush Cap with a straight slot
screwdriver.
(2) Remove the worn-out Carbon Brush and replace
it with a new one. Then reattach the Brush Cap.
(3) After replacing the Brush, operate the unit for
about ten minutes with no load.
Fig. 34