9. STARTING MOTOR (d) Armature and commutator run-out Use a dial gauge and measure the armature core run-out and commutator run-out. Cor- rect or replace if the limit is exceeded. mm (e) Commutator surface inspection If the commutator surface is roughened, grind with #500 to #600 emery cloth. (f) Commutator insulation depth Measure the depth of the insulating material between commutator segments, and correct it if it is less than the limit. mm 9-10 82E-5 – 98E-5 SERIES Standard Limit Armature 0.03 0.2 Commutator 0.03 0.2 Standard Limit 0.5 – 0.8 0.2