Commutator

Commutator

1. INSPECT COMMUTATOR FOR DIRTY AND BURNT SURFACES
If the surface is dirty or burnt, correct it with sandpaper (No. 400) or on a lathe.







2. INSPECT COMMUTATOR CIRCLE RUNOUT
a. Place the commutator on V-blocks.
b. Using a dial gauge, measure the circle runout.

Maximum circle runout:
0.05 mm (0.0020 in.)

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







3. INSPECT COMMUTATOR DIAMETER
Using a vernier caliper, measure the commutator diameter.

Standard diameter:
30 mm (1.18 in.)

Minimum diameter:
29 mm (1.14 in.)

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

Undercut (3RZ-FE):

4. INSPECT UNDERCUT DEPTH
Check that the undercut depth is clean and free of foreign materials. Smooth out the edge.

Standard undercut depth:
0.6 mm (0.024 in.)

Minimum undercut depth:
0.2 mm (0.008 in.)

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