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06 07 08 09 − − − − Commutator Diameter 29.5 mm (1.154 1.161 in.) Service Limit: 28.8 mm (1.134 in.) Commutator Runout 0.1 mm (0.004 in.) Commutator Mica Depth 0.50 mm (0.016 0.020 in.) Service Limit: 0.20 mm (0.008 in.) 4-13 A B C D A 5. Check the commutator diameter. If the diameter is below the service limit, replace the armature. 6. Measure the commutator (A) runout. • If the commutator runout is within the service limit, check the commutator for carbon dust or • If the commutator runout is not within the service limit, replace the armature. 7. Check the mica depth (A). If the mica is too high (B), undercut the mica with a hacksaw blade to the 8. Check for continuity between the segments of the commutator. If there is an open circuit between any (cont’d) |