MOTOR (MODEL EJ4-4001 AND EJ8-4001A)
Motor Component Testing and Inspection
18
754
Figure 18-10
Brush Rigging
755
Figure 18-11
Bearing Retaining Ring
MOTOR COMPONENT TESTING AND INSPECTION
See General Warnings on page 1-1.
ARMATURE INSPECTION AND TESTING
1.
Remove the motor from the vehicle.
See Motor Removal on page 18-3.
2.
Remove the end cap and armature by performing steps 1 through 7 of Motor Disassembly on page 18-4.
Visual Inspection
• Burned, charred or cracked insulation
• Improperly cured varnish
• Thrown solder
• Flared armature windings
• Damaged armature core laminations
• Worn, burned or glazed commutators
• Dirty or oily commutators
• Raised commutator bars
• Worn armature bearing or shaft
A dirty or oily commutator should be cleaned and wiped dry. Abnormalities identified during the inspection can help
determine original cause of failure. Slight roughness of the commutator can be polished smooth with 400 grit or
finer sandpaper.
See following CAUTION and NOTE.
2009 Electric Precedent Maintenance and Service Manual
Page 18-7