1I-8 Starting System:
Brush Holder
• Check movement of brush in brush holder. If brush
movement within brush holder is sluggish, check
brush holder for distortion and sliding faces for
contamination. Clean or correct as necessary.
• Check for continuity across insulated brush (positive
side) and grounded brush (negative side). If continuity
exists, brush holder is grounded due to defective
insulation and should be replaced.
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
The following specification presupposes that
armature is free from bend. Bent armature
must be replaced.
Commutator out of round
Standard: 0.05 mm (0.002 in.) or less
Limit: 0.4 mm (0.016 in.)
• Inspect commutator for wear. If diameter is below
limit, replace armature.
Commutator outside diameter
Standard: 29.4 mm (1.16 in.)
Limit: 28.8 mm (1.13 in.)
• Inspect commutator for insulator depth. Correct or
replace if below limit.
Commutator insulator depth “a”
Standard: 0.4 – 0.6 mm (0.016 – 0.024 in.)
Limit: 0.2 mm (0.008 in.)
I4RS0A190004-01
IYSQ01190034-01
3. Magnetic stand
[A]: Correct
1. Commutator segment
[B]: Incorrect
2. Insulator
IYSQ01190035-01
IYSQ01190036-01
I5JB0A190003-01
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