Inspection And Maintenance - Yanmar 3TNV Series Service Manual

9. Starting Motor

9.1.5 Inspection and Maintenance

(1) Armature
(a) Commutator outside diameter
Measure the commutator outside diameter and
replace the commutator if the measured value is less
than the limit.
mm
Standard Limit
36.5 35.5
(b) Armature coil continuity test
Check continuity between commutator segments with
a multimeter. Good if continuity exists.
In case of no continuity (coil disconnection), replace
the armature.
(c) Armature coil insulation test
Inspect the continuity between a commutator segment
and the shaft or core with a multimeter. Good if no
continuity exists.
If continuity exists (coil short circuit), replace the
armature.
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