18-7
• ARMATURE
Check the armature and shaft gear for wear and damage.
• ARMATURE SHORT-CIRCUIT TEST
Place the armature in an armature tester (commercially
available).
Hold a hacksaw blade close to the armature core. If the blade is
attracted to the core or vibrates when the core is turned, the
armature is shorted. Replace the armature.
• CONTINUITY CHECK – SEGMENTS
Check for continuity between each segment.If an open circuit
exists between any two segments, replace the armature.
• SHORT-CIRCUIT TEST – SHAFT-TO-
COMMUTATOR
Check for continuity between the commutator and armature
shaft. If there is continuity, replace the armature.