BF15DoBFZOD
POWER
TILT
MOTOR
Brush
Measure the brush length.
If
the brush length is less than the service limit, replace the
brush holder assembly.
Standard
I
Service limit
I
10
mm
(0.4
in)
I
6
mm
(0.2
in)
I
Armature
1)
Check the armature for wear
or
damage. Replace if nec-
essary.
2)
Visually inspect the commutator surface for dust, rust or
other damage. If necessary, wipe it with a clean lint-free
cloth or dress with a fine emery cloth.
3)
Measure the mica depth.
If
the grooves are clogged,
clean the grooves and measure the depth again.
If
the
measurement
is
less than the service limit, replace the
armature.
Service limit
0.8
mm
(0.03
in)
4)
Check the bearing for play. Replace the armature if it has
excessive play or abnormal noise.
5)
Check for continuity between each segment.
If
an open
circuit exists between any two segment, replace the
armature.
6)
Check for continuity between the commutator and arma-
ture coil core.
If
continuity exists, replace the armature.
7)
Check for continuity between the commutator and arma-
ture shaft.
If
there is continuity, replace the armature.
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