COMPONENT SERVICE-STARTING SYSTEM
Testing Commutator Runout
1. Place armature in a pair of “V” blocks and check runout
with a dial indicator.
2. Check both shaft and commutator. A bent shaft requires
replacement of armature.
,3. If commutator runout exceeds 0.05 mm (002 in.),
commutator should be refaced. Remove only enough
metal to provide a smooth; even surface.
/
Commutator runout . . . ‘. . . Max 0.05 mm (.002 in.)
Under cut depth . . . . . . . . . . . . . . . 0.5 mm (.02 in.)
TESTING FIELD COILS FOR GROUNDING
1. Touch one probe of test lamp to series field coil lead
and other probe to yoke. Lamp should not light.
If lamp lights, coils are grounded. If field coils are ground-
ed, replace field coil and yoke assembly.
TESTING BRUSH HOLDER
1. Touch. each of the insulated brush holders with one test
probe, while holding other test probe against brush
holder plate.
2. The lamp should not light during this test since the brush
holders are insulated. If the lamp lights brush holders
on brush holder plate are grounded. Replace brush
holder assembly if brush holders are grounded.
SERVICING DRIVE UNIT
Overrunning Clutch
1. While holding clutch housing, rotate the pin:ion. Drive
pinion should rotate smoothly in one direction, but
should not rotate in opposite direction. If clutch does
not. function properly, replace overrunning clutch as-
sembly.
2.’ Inspect pinion for wear or burrs. If pinion ,i:s worn or
burred, replace overrunning clutch assembly. If pinion
is damaged, also inspect ring gear for wear or burrs.
Yoke ,
6E LO85
Direct drive type
\ /
lEL012
8-94
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