Starter Armature: Testing and Inspection

Armature Shaft Bush




Inspect bush for wear or damage. Replace if necessary.

Armature




- Inspect commutator for dirt or burn. Correct with sandpaper or lathe, if necessary.




- Check commutator for uneven wear with armature (1) supported on V-blocks (2). If deflection of dial gauge (4) pointer exceeds limit, repair or replace.

NOTE: Below specification presupposes that armature is free from bend. Bent shaft must be replaced.




- Inspect commutator for wear. If diameter is below limit, replace armature.




- Inspect commutator (1) for insulator (2) depth. Correct or replace if below limit.




- Ground Test
Check commutator and armature core. If there is continuity, armature is grounded and must be replaced.




- Open Circuit Test
Check for continuity between segments. If there is no continuity at any test point, there is an open circuit and armature must be replaced.