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105

CHAPTER 9. ELECTRICAL ACCESSORIES

armature coil core. If there is no continuity, the

armature coil is normal.

Fig. 9-11

2) Inspection of armature coil for short circuit

• Turn the armature coil on a armature coil tester

while holing a piece of iron closely above the

armature. If the iron piece does not vibrate nor

is attracted to the armature, the armature is nor-

mal.

Note: The armature coil surfaces should be

cleaned ahead of time.

Fig. 9-12

3) Inspection of the commutator

• Inspect the commutator surfaces for dirt, burn-

ing, damage, etc. Minor damage can be corrected

with sandpaper of #400 or higher no.

• Inspect the commutator for run-out with a dial

gauge on a V-block.

Standard value Usable limit

0.02 mm 0.05 mm

• Measure the commutator diameter with vernier

calipers.

Standard value Usable limit

30 mm 29 mm

Fig. 9-14

• Measure mica depth against segment top.

Standard value Usable limit

0.5 - 0.8 mm 0.2 mm

Fig. 9-15

4) Inspection of field coils for short circuit

• Inspect for continuity across the lead from termi-

nal C and field coil brush. If there is continuity,

the coils are normal.

Fig. 9-16

5) Inspection of field coils for grounding

• Inspect continuity across the field coil brush and

field coil. If there is no continuity, the coils are

normal.Fig. 9-13

Iseki SGR19 User Manual

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