Commutator

1. INSPECT COMMUTATOR FOR DIRTY AND BURNT SURFACES

If the surface is dirty or burnt, correct with sandpaper (No. 400) or a lathe.

2. INSPECT COMMUTATOR CIRCLE RUNOUT

If the circle runout is greater than the maximum, correct with a lathe.

Maximum circle runout: 0.05 mm (0.0020 in.)

3. MEASURE DIAMETER OF COMMUTATOR

If the diameter of the commutator is less than the minimum, replace the armature.

Standard diameter: 30 mm (1.18 in.) Minimum diameter: 29 mm (1.14 in.)

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4. INSPECT UNDERCUT DEPTH

Check that the undercut depth is clean and free of foreign particles. Smooth out the edge.

If the undercut depth is less than the minimum, correct it with a hacksaw.

Standard undercut depth: 0.6 mm (0.024 in.) Minimum undercut depth: 0.2 mm (0.008 in.)

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