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Check the mica depth (A). If the mica is too high (B), undercut the mica with a hacksaw blade to the proper depth. Cut away all the mica (C) between the commutator segments. The undercut should not be too shallow, too narrow, or V-shaped (D).
Commutator Mica Depth
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Standard (New):
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0.50 mm (0.020 in.)
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Service Limit:
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0.20 mm (0.008 in.)
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