Armature Test

Using ohmmeter, check continuity between commutator and core. See Fig 1 . If continuity exists, replace armature.
Check continuity between commutator and shaft. See Fig 2 . If continuity exists, replace armature.
Place armature on "V" blocks. Using a dial indicator, measure runout at commutator. If runout is not within specification, repair armature with a lathe or replace armature. See Fig 3 .
Measure diameter of commutator. See Fig 4 . Replace armature if diameter of commutator is at, or less than, grind limit. See TORQUE SPECIFICATIONS .
If commutator surface is dirty, wipe it with a cloth; if it is rough, repair it with a lathe or fine sandpaper.
Check depth of mold between commutator segments. Replace armature if depth of mold is at, or less than minimum. See Fig 5 . See STARTER SPECIFICATIONS .

Fig 1: Checking Commutator To Core Continuity

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Fig 2: Checking Commutator To Shaft Continuity

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Fig 3: Measuring Commutator Runout

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Fig 4: Measuring Diameter Of Commutator

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Fig 5: Checking The Depth Of Mold Between Segments

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