Fig 62 Fig 63
（2）Measure diameter of commutator with outside micrometer, if the measured value is smaller
than the limitation size, please change armature. (Refer Fig 63)
（3）If there is much difference between excircle wire harness of commutator and axes
parallelism, while the minimum size limitation of axial diameter is in the allowable range. Please
modify to the specified value on the lathe. Refer to Fig 64 ，
Fig (a) is good, Fig (b) is bad.
Fig 64
1.6.2 Check the electric brush wear Refer to Fig 65
（1）If there is soil and dust on the wearing surface, please burnish with abrasive cloth.
（2）Measure the electric brush height with slide gauge. If A is abrasive (means A’s size is
smaller), please replace the electric brush.
Fig 65
1.6.3 Check electric brush holder Refer to Fig 66
Check the insulating property between the insulating electric brush holder and supporting plate,
if it is current conducting, please replace the electric brush holder.
Fig 66
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