3. INSPECT COMMUTATOR DIAMETER
Using a vernier caliper, measure the commutator diameter.
Standard diameter:
30 mm (1.18 in.)
Minimum diameter:
29 mm (1.14 in.)
If the diameter is less than minimum, replace the armature.
4. INSPECT UNDERCUT DEPTH
Check that the undercut depth is clean and free of foreign
materials. Smooth out the edge.
Standard undercut depth:
0.6 mm (0.024 in.)
Minimum undercut depth:
0.2 mm (0.008 in.)
If the undercut depth is less than minimum, correct it with a
hacksaw blade.
Field Frame (Field Coil)
1. INSPECT FIELD COIL FOR OPEN CIRCUIT
Using an ohmmeter, check that there is continuity between
the lead wire and field coil brush lead.
If there is no continuity, replace the field frame.
2. INSPECT FIELD COIL FOR GROUND
Using an ohmmeter, check that there is no continuity be-
tween the field coil end and field frame.
If there is continuity, repair or replace the field frame.
Brushes
INSPECT BRUSH LENGTH
Using a vernier caliper, measure the brush length.
Standard length:
15.0 mm (0.591 in.)
Minimum length:
10.0 mm (0.394 in.)
–STARTING SYSTEM STARTER
ST–9
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