MOTOR Testing and Inspecting Individual Components
Page 15-6 1998/1999 PowerDrive Plus Maintenance and Service Supplement
15
Armature Ground Test
1. With a multimeter set to 200 ohms, place one probe on the commutator and the other on the armature core.
The multimeter should indicate no continuity (Figure 15-7, Page 15-6). If the reading is incorrect, replace the
motor.
FIELD WINDINGS
Burned or scorched insulation on the field windings indicates the motor has overheated due to overloads or
grounded or shorted coil windings. If the insulation on the field windings is scorched, replace the motor or the sta-
tor shell assembly.
• NEVER USE EMERY CLOTH TO SMOOTH THE COMMUTATOR. PARTICLES OF EMERY ARE CONDUCTIVE AND MAY
SHORT-CIRCUIT THE COMMUTATOR BARS. NEVER USE OIL OR LUBRICANTS ON THE COMMUTATOR OR BRUSHES.
• OIL ON THE COMMUTATOR MAY INDICATE A FAULTY TRANSAXLE INPUT SHAFT OIL SEAL.
• DO NOT SUBMERGE THE ARMATURE IN SOLVENT.
• BEFORE TESTING THE ARMATURE, WIPE IT CLEAN WITH A CLEAN CLOTH. REMOVE ANY CARBON DUST AND
METAL PARTICLES FROM BETWEEN THE COMMUTATOR BARS.
Figure 15-7 Armature
CAUTION
NOTE
CAUTION
NOTE
COMMUTATOR
ARMATURE CORE
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