MIL-HDBK-1164
Table 20
Routine Operations Checklist for Electric Motors
Inspection
Action
Motor
Keep the motor free from dirt or moisture.
Keep the operating space free from articles
that may obstruct air circulation.
Check the bearings for oil leakage.
Check regularly for these unusual
Unusual Conditions
conditions. Report any irregularities to the
plant superintendent for correction by the
Unusual noises in operation
electrical shop.
Motor fails to start or to come up to
speed normally
Motor or bearings feel or smell hot
Continuous or excessive sparking at
commutator
Hot commutator
Blackened commutator
Sparking at brushes
Fine dust under couplings with
rubber buffers or pins
Smoke, charred insulation, or solder
whiskers extending from armature
Excessive hum
Regular clicking
Rapid knocking
Chattering brush
Vibration
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