Inspection And Maintenance - Yanmar 3TNV Series Service Manual

9.2.6 Inspection and maintenance

(1) Armature
1) Check the commutator for rough surface. If so, smooth the surface using #500 to #600 emery
cloth.
If the outside periphery of the commutator has been deflected over 0.2 mm, repair by a lathe.
2) Measure the depth of the insulating material between commutator segments, and correct if it is
less than 0.2 mm.
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9. Starting Motor