Kohler Courage SV710-740 Service Manual page 86

Check and inspect the following areas:
a. The pinion teeth for abnormal wear or damage.
b. The surface between the pinion and the clutch
mechanism for nicks, or irregularities which
could cause seal damage.
c. Check the drive clutch by holding the clutch
housing and rotating the pinion. The pinion
should rotate in one direction only.
Inspect both the springs and brushes for wear, fatigue,
or damage. Measure the length of each brush. The
minimum length for each brush is 7.6 mm (0.300 in.).
See Figure 7-50. Replace the brushes if they are worn
undersize, or their condition is questionable.
1. Clean and inspect the commutator (outer
surface). The mica insulation must be lower than
the commutator bars (undercut) to ensure proper
operation of the commutator. See Figure 7-51.