Question 76Electricity & Electronics - Assistant Engineer

The correct answer is A) Completely filling the bearing cavity with new grease. This practice should be avoided when regreasing the electric motor bearing as shown in figure "B" of the illustration. Completely filling the bearing cavity with new grease can lead to an excessive amount of grease, which can cause overheating and damage to the bearing. The proper practice is to only partially fill the bearing cavity with new grease, as indicated in option D. This allows room for the old grease to mix with the new grease and ensures proper lubrication without causing issues from overpacking the bearing. The other options, B) flushing out the old grease while running the motor with no load, and C) flushing out the old grease with an approved solvent, are generally acceptable practices, but they are not the best practice in this specific situation as indicated by the illustration.