Kohler Command PRO CS Service Manual page 84

Section 8
Electrical System and Components
2. Inspect both the springs and brushes for wear,
fatigue, or damage. Measure the length of each
brush. The minimum length for each brush must
be 9 mm (0.350 in.). See Figure 8-44. Replace the
brush plate assembly if the condition of parts is
out of specification or questionable.
Brushes
Figure 8-44. Brush Checking.
Spring
Figure 8-45. Brush Plate Details.
Armature Commutator
1. Clean and inspect commutator (outer surface).
Use 600 grit sandpaper to clean if necessary.
2. Measure the mica (insulation depth between the
commutator segments). The depth should be
2 mm (0.079 in.). If less, cut/scrape the mica to the
proper measurement using a hacksaw blade or
similar tool ground to fit between the segments.
See Figure 8-46.
NOTE: The mica insulation of the commutator
must be undercut to ensure proper
operation of the commutator.
8.28
Wear limit length:
9 mm (0.35 in.)
Spring
Depth:
2 mm (0.079 in.)
Figure 8-46. Commutator Mica Depth.
Armature Coil
1. Use an ohmmeter set to the Rx1 scale. Touch the
probes between two different segments of the
commutator, and check for continuity. See Figure
8-47. Test all the segments. Continuity must exist
between all or the armature is defective.
2. Check for continuity between the armature coil
segments and the commutator segments. See
Figure 8-47. There should be no continuity. If
continuity exists between any two, the armature
is defective.
3. Check armature windings/insulation for shorting.
See Figure 8-47.
Insulation
Check
Armature
Coil
Figure 8-47. Armature Checking.
x1
–x1k +
Continuity
Check