19
MAINTENANCE
AND
INSPECTION
1.
Inspecting
the
drill
bits
Since
use
of
a
dull
tool
will
cause
motor
malfunctioning
and
degraded
e
ffi
ciency,
replace
the
drill
bit
with
new
ones
or
resharpen
them
without
delay
when
abrasion
is
noted.
2.
Inspecting
the
mounting
screws
Regularly
inspect
all
mounting
screws
and
ensure
that
they
are
properly
tightened.
Should
any
of
the
screws
be
loose,
retighten
them
immediately.
Failure
to
do
so
could
result
in
serious
hazard.
3.
Maintenance
of
the
motor
The
motor
unit
winding
is
the
very
”heart”
of
the
power
tool.
Exercise
due
care
to
ensure
the
winding
does
not
become
damaged
and/or
wet
with
oil
or
water.
4.
Inspecting
the
carbon
brushes
For
your
continued
safety
and
electrical
shock
protection,
carbon
brush
inspection
and
replacement
on
this
tool
should
ONLY
be
performed
by
a
HITACHI
Authorized
Service
Center.
5.
Replacing
supply
cord
If
the
supply
cord
of
Tool
is
damaged,
the
Tool
must
be
returned
to
a
Hitachi
Authorized
Service
Center
for
the
cord
to
be
replaced.
6.
Service
parts
list
CAUTION
Repair,
modi
fi
cation
and
inspection
of
Hitachi
Power
Tools
must
be
carried
out
by
an
Hitachi
Authorized
Service
Center.
This
Parts
List
will
be
helpful
if
presented
with
the
tool
to
the
Hitachi
Authorized
Service
Center
when
requesting
repair
or
other
maintenance.
In
the
operation
and
maintenance
of
power
tools,
the
safety
regulations
and
standards
prescribed
in
each
country
must
be
observed.
MODIFICATIONS
Hitachi
Power
Tools
are
constantly
being
improved
and
modi
fi
ed
to
incorporate
the
latest
technological
advancements.
Accordingly,
some
parts
may
be
changed
without
prior
notice.
NOTE
Due
to
HITACHI’s
continuing
program
of
research
and
development,
the
speci
fi
cations
herein
are
subject
to
change
without
prior
notice.
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