100
Fig.
300 (D Carbon brushes
@ Springs
]) Commutator
Fig. 301 Stator coil inspection
Fir. 302 Armature coil inspection
6. ELECTRICAL
B. Inspection
1. Carbon brush inspection
Worn carbon brush, pitted or rough con-
tact surface and weakened brush spring
will cause starting difficulty, therefore,
they should be replaced.
2. Commutator cleaning
Dirty commutator will give poor starting
motor performance.
Surface of the commutator should be
polished with a fine grade emery paper
and completely washed before reassembly.
3. Stator coil inspection
Check continuity between the brush
wired to the stator coil and the starting
motor cable. Lack of continuity indicates
an open stator coil and should be replaced.
4. Armature coil inspection
A grounded armature coil wil~ render the
starting motor inoperative.
Perform a continuity test between the
commutator and the core. A continuity
condition indicates a grounded stator coil
and should be replaced.
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