Installation Instructions
9
ELECTRICAL
SYSTEM
B1700·B2100·B2400 WSM,11770
SERVICING
Staining
or
Burning
of
Commutator
1.
Check
to
see
if
the commutator surface
is
stained
or
burnt.
2.
If
it
is
burnt, grind
off
with
a fine-grain sandpaper.
Factory
spec.
0.5to
1.0
mm
Mica undercut
0.020
to
0.039 in.
Allowable
limit
0.2
mm
0.008 in.
(a)
Bad
(b) Good
(3)
Depth
of
Mica
(1)
Mica
(2)
Segment
Mica Undercut
1.
Check
to
see
the
mica undercut.
2.
Ifthe
mica
is
less
than
the
allowable
limit,
correct
with
a saw
blade.
As
the edge
of
the segment
will
be
rough, chamfer it.
(a) (b)
-~
....:.
".
:;"-.
~
=-~.
~
~
(a)-
-.
CP
rp-
C022F058
(1)
Allowable Limit Line
Grounding
of
Armature Coil
1.
Measure
the
resistance
with
an
ohmmeter
across
the
commutator and
the
armature shaft.
2.
If
infinity
is
not
indicate, replace it.
Infinity
Commutator -
Armature
Resistance
Brush Wear
1.
If
the
conduct face
of
the
brush
is
dirty
or dusty, clean
it
with
sandpaper.
2.
Visually inspect the brush wear.
3.
Ifthe
brush
is
worn
more than allowable
limit,
replace
it.
B177F923
Grounding
of
Brush Holder
1.
Measure
the
resistance
with
an ohmmeter
across
the
brush
holder and
the
holder support.
2.
If
infinity
is
not
indicated, replace it.
Resistance
Brush
holder -
Holder support
Infinity
9-512