ABB M3JP Manuel D'installation page 24

TROUBLE
Hot bearings
24 – ML/EN ABB Motors and Generators | 3GZF500730-47 rev F 08-2016
CAUSE
Bent or sprung shaft
Excessive belt pull
Pulleys too far away from shaft
shoulder
Pulley diameter too small
Misalignment
Insufficient grease
Deterioration of grease or lubricant
contaminated
Excess lubricant
Overloaded bearing
Broken ball or rough races
WHAT TO DO
Straighten or replace shaft.
Decrease belt tension.
Move pulley closer to motor bearing.
Use larger pulleys.
Correct by realigning the drive.
Maintain proper quality and amount of grease in
bearing.
Remove old grease, wash bearings thoroughly in
kerosene and replace with new grease.
Reduce quantity of grease: bearing should not be more
than half full.
Check alignment, side and end thrust.
Clean housing thoroughly, and then replace bearing.