Yanmar 4TNV98, Service Manual

Page: 230 / 246

4TNV98 & 4TNE98 Diesel Engine Section 7. Starter Motor 228
Figure 11-13
See Starter Motor Specifications on page 222 for
the service limit.
Measure Commutator Insulation Depth
Measure the depth of the insulating material
(Figure11-14, (1)) between commutator segments
(Figure11-14, (2)) . If the depth measures less than
the limit, use a hacksaw blade (Figure11-14, (3)) to
remove the insulating material until the depth is
within the limit.
A normal commutator condition is indicated in
(Figure11-14, (4)) . An abnormal commutator
condition is indicated in (Figure11-14, (5)) .
Figure 11-14
See Starter Motor Specifications on page 222 for
the service limit.
Armature Coil Continuity Test
Check for continuity between the commutator
segments using a multimeter
(Figure 11-15) . The
multimeter should indicate continuity.
Figure 11-15
If the multimeter does not indicate continuity,
replace the armature.
Armature Coil Insulation Test
Check for continuity between a commutator
segment and the shaft or armature using a
multimeter
(Figure11-16) . The multimeter should
not indicate continuity.
Figure 11-16
If the multimeter indicates continuity, replace the
armature.