Causes and Remedies

Causes Remedies
a) Fan not rotating due to touching with Fancover.
b) Dust, dirt and foreign particle got stuck between the Oilseal / V ring seal and shaft.
c) Rotor endrings fins obstructing with bearing cover nuts due to bearing cover fitted wrongly.
a) Replace Fan / Fancover.
b) Remove the dust, dirt and foreign particles.
c) Open the motor and refit. Open the motor and refit the bearing cover correctly.