PROBLEM PROBABLE CAUSE
SOLUTION
TROUBLE SHOOTING GUIDES
ELECTRIC MOTORS
(Temperature Rise Above
Ambient Greater Than Rotor rubs stator bore Check motor bearings and replace
Nameplate Specifications)
Worn bearings Replace bearings and seals
Motor Vibrates When Motor mounting bolts loose Tighten mounting bolts
Connected to Driven
Equipment Rigid type coupling used to Replace coupling with a proper coupling
connect motor to driven
equipment
Driven equipment unbalanced Balance driven equipment
Worn motor bearings Replace bearings and seals
Motor (3 phase) running on Check for open circuit and correct
single phase
Bent motor shaft Replace shaft or rotor
Rapid Motor Bearing Excessive overhung load Check overhung load, retension drive.
Wear due to over tensioned drive
Excessive overhung load Check "NEMA Sheave Selection Guide" in the
due to a smaller diameter Browning Catalog. Replace sheave with one of size
sheave than recommended equal to or greater than listing
minimum used on motor
shaft
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