How to Properly Grease an Electric Motor

Regularly greasing your electric motor bearing is an important part of electric motor maintenance. When applied correctly, the right grease will protect your electric motor's bearing against damaging corrosion, reduce wear caused by friction, and act as a seal against contaminants. At Southern Rewind Ltd we provide electric motors, electric motor repair, and generator repair in Lethbridge, so we know a thing or two about properly greasing an electric motor.

Electric Motor Greasing Procedure 


Knowing the right process for greasing an electric motor in Lethbridge will help to increase motor productivity and prevent motor failure. Just follow these six steps:

Step 1

Before you begin, you need to make sure that you have the correct grease. The incorrect lubricant can easily cause premature bearing failure. Additionally, because they can be made with different thickeners, not all lubricants are compatible. You need to use either the same grease or compatible
types of grease over the life of the bearing.

Step 2

Next, you'll want to clean any grease, dirt, or other debris from around the pressure fitting and grease relief plug. Upon removing the grease relief plug, you should also try to use a brush in order to clear the grease relief of any hardened grease.

Step 3

Now you can grease the bearing, but you need to be careful to use only the correct amount of grease for your motor. Grease slowly as well, so as to minimize grease cavity pressure buildup. Overfilling a grease cavity and applying too much pressure from the grease gun can force the excess grease
between the bearing cap and the shaft, causing the motor to fail.

Step 4

As you grease your electric motor, the old grease should be purged from the relief port. If this doesn't happen, then it is a sign of lubrication starvation. Lubrication starvation may occur if not enough grease was added previously, if the bearing is not greased regularly, or if excessive operating heat has caused the oil and thickener to separate. Any of these factors may cause the lubricant to harden and block the relief passage.

Step 5

After you've finished greasing and before replacing the relief plug, run the motor for about half an hour. The motor's operating temperature will cause the grease to expand and force any excess grease to be expelled, reducing bearing housing pressure. An over-pressurized bearing housing can place too much stress on the motor, hindering its operation. Excess grease can also cause the motor to overheat, increasing the risk of lubrication starvation and even bearing failure.

Step 6

Once all excess grease has been expelled, you can go ahead and replace the relief plug. Clean any grease away from the relief port, and you've finished greasing your electric motor.

Electric Motors and Electric Motor Repair in Lethbridge

Is your electric motor just not working as well as it used to despite being properly greased? You can trust Southern Rewind Ltd for expert advice on electric motors and for electric motor repair in Lethbridge. In order to meet the needs of our commercial and industrial clients, we offer pump repair and generator repair in Lethbridge as well.

For repairs, sales, and more information on electric motors in Lethbridge, just contact Southern Rewind Ltd today.

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