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Measure the commutator (A) runout.
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If the commutator runout is within the service limit, check the commutator for carbon dust or brass chips between the segments.
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If the commutator runout is not within the service limit, replace the armature.
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Commutator Runout
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Standard (New):
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0.02 mm (0.001 in.) max.
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Service Limit:
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0.05 mm (0.002 in.)
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