1346 / 1906
ELECTRICAL
44
Commutator run out
Standard (New): 0.02mm (0.0008in.) max
Service limit: 0.05mm (0.0020in.)
7. Check the mica depth (A). If the mica is too
high (B), undercut the mica with a hacksaw
blade to the proper depth. Cut away all the
mica (C) between the commutator segments.
The undercut should not be too shallow, too
narrow, or v-shaped (D).
Commutator mica depth
Standard (New): 0.5 mm (0.0197 in.)
Limit: 0.2mm (0.0079 in.)
8. Check for continuity between the segments of
the commutator. If an open circuit exists
between any segments, replace the armature.
9. Check with an ohmmeter that no continuity
exists be- tween the commutator (A) and
armature coil core (B), and between the
commutator and armature shaft (C). If
continuity exists, replace the armature.