8.21
Section 8
Electrical System and Components
8
12. Remove the drive pinion assembly from the
armature.
13. Clean the parts as required.
NOTE: Do not
soak the armature or use solvent
when cleaning. Wipe clean using a soft
cloth, or use compressed air.
Inspection
Drive Pinion
Check and inspect the following areas:
a. The pinion teeth for abnormal wear or
damage.
b. The O.D. 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. Pinion
should rotate in one direction only.
Brushes and Springs
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 8-40.
Replace the brushes if they
are worn undersize, or their condition is
questionable.
Figure 8-40. Brush Checking.
Armature
1. Clean and inspect the commutator (outer
surface). The mica insulation of the commutator
must be lower than the O.D. surface (undercut) to
ensure proper operation of the commutator. See
Figure 8-41.
Figure 8-39. Removing Retaining Ring.
Figure 8-37. Armature and Lever Removed.
10. Push the stop collar down to expose the retaining
ring. See Figure 8-38.
Figure 8-38. Retaining Ring Details.
11. Remove the retainer from the armature shaft.
Save the stop collar.
NOTE:
Do not reuse the old retainer.
Wear limit length:
7.6 mm (0.300 in.)
